bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation on the Dielectrophoretic Assembly of Carbon Nanotubes
Authors: Zhen Shao Hua , An Li Bao , Chang Chun Rui
Published: August 2013

Dielectrophoresis (DEP) has been verified to be an efficient means of assembling carbon nanotubes (CNTs) for various applications. This paper simulates the electric field distribution of the quadruple electrode structure when the external AC voltage is applied between a pair of opposite electrodes. There exist induced electric potentials between high voltage electrodes and floating electrodes and thus floating electrodes seriously change the field distribution. For a pair of wide parallel electrodes, the deposition of one CNT bridging the electrode pair will greatly alter the local electric field and repel the further deposition of CNTs in the vicinity. The screening distance is relevant with the width of the electrode gap, which provides a way to estimate the density of assembled CNTs between the electrode pair.
Effects of MAPE Treatments on Thermal Properties of Silvergrass Reinforced High Density Polyethylene Composites
Authors: Xue Dong , Yu Wang Wang , Lu Jing , Liu Qin , Liu Xue Jing , Lei Wen
Published: August 2013

In this study,silvergrass (SV) reinforced high density polyethylene (HDPE) composites (WPCs) were prepared by injection molding. The effects of maleated polyethylene (MAPE), Slivergrass fibers (SV) content on the thermal, crystalline properties of WPCs were investigated. It was found that compared with the untreated WPCs, the thermal stability of the composites after incorporation of MAPE was significantly improved. Moreover, the results show that with MAPE adding, SV was an effective heterogeneous nucleating agent.
Characterization of Core-Shell Structure Palygorskite Modified by Nano-CaCO3 (PnC) Composite Particles
Authors: Zhao Di Fang , Li Ming Hua , Xie Jin Song
Published: August 2013

In this work, Core-shell structure palygorskite/nanoCaCO3 (PnC) composite particles have been synthesized chemically, employing solution precipitation methods. Crystal structure, morphology and thermal stability properties are investigated by means of X-ray diffraction (XRD), transmission electronic microscopy (TEM) and Thermogravimetric (TG) analysis. The results showed that the PnC particles were almost monodispersed microsphere aspect with the size was about 1-3 μm diameter. The nanocomposite particles exhibit the marked thermal stability properties than the palygorskite clay mineral.
Research on Structural Inheritance Characteristic and the Related Normalizing Elimination Process for 300M Steel
Authors: Liu Da Bo , Liu Jun Wei , Lu Shi Qiang
Published: August 2013

The characteristic of structural inheritance for 300M steel was explored and the eliminating effect of normalization was investigated. Then, both the first and secondary normalization process was optimized by comparing eliminate effect. It is known that obvious characteristic of structural inheritance can be shown with the condition of 810°C-840°C×30min/OC after over-heated treatment. The first normalization process whose condition is 950°C~1100°C×2.5h/air cooling has the good effect on eliminating structural inheritance. While, the secondary normalization process whose condition is 960°C~1060°C×2h/air cooling+925°C×2.5h/air cooling owns the better effect on eliminating structural inheritance.
Research on the Reverse Loading Hardening Model of the X80 Pipeline Steel
Authors: Cai Xing Zhou , Wang Lin Feng , Zhao Shi Yan , Guo Bao Feng , Zhu Yu Xin
Published: August 2013

Based on the reverse uniaxial loading test, the influences of the plastic deformation on the strength properties are studied. The softening of the X80 pipeline steel is observed which reveals the hardening type is mixed hardening. The expression of mixed hardening factor M and the material parameters of the nonlinear mixed hardening model under different M can be obtained. The results show that, if the pre-strain increases and ranges from 0.55% to 2.5%, the mixed hardening characteristics of the X80 pipeline steel will be more obvious and its M will also increase.
Phase Transformation Behaviors of Nb-V-Ti Microalloyed Pipeline Steel X70
Authors: Wang Yu Hui , Zheng Ya Nan , Wang Tian Sheng , Liao Bo , Liu Li Gang
Published: August 2013

The CCT (continuous cooling transformation) diagrams of the Nb-V-Ti without Mo containing microalloyed pipeline steel X70 were investigated. The microstructures observed in continuous cooled specimens are composed of P (pearlite), PF (polygonal ferrite), QF (quasi-polygonal ferrite), and GF (granular bainite ferrite). At low cooling rates between 0.1°C/s and 1°C/s, the microstructure of the steel consisted of banded ferrite and pearlite but higher cooling rates suppressed its formation.
Effects of Nb on Martensite Size in B-Bearing Steel
Authors: Zhang Yu , Guan Hong , Gao Zhi Guo
Published: August 2013

The research about effects of Nb on martensite size and mechanics in B-bearing steel was completed. The results show that both steels have similar martensite due to high hardenability of B element which is responsible for high mechanical properties. However, there are differences in the microstructures between A steel (Nb-containing steel) and the B steel (Ti-containing steel). Microstructural observation of the quenched specimen shows that the formation of fine martensite is dominant in the A Steel than B steel due to Nb element. Martensite size in B-bearing steel was refined by Nb element for high fatigue property and toughness.
The Latest Development on the Heat Treatment, Microstructure and Mechanical Properties of Low-Carbon Martensite Steel
Authors: Ma Bei Yue , Yan Chen , Ding Yu Shi , Li Ying , Liu Yan Dong
Published: August 2013

In this paper, the latest research development on the heat treatment processes, microstructure and mechanical properties of low-carbon martensite steel was reviewed. And the effects of heat treatment processes on the microstructure and mechanical properties of low-carbon martensite steel were analyzed.
Evaluation on the High-Temperature Oxidation Behavior of HP Steam Turbine Rotor Materials
Authors: Niu Li Bin , Shibata Takuya
Published: August 2013

High-temperature oxidation behaviors of super-clean 9CrMoV steel and 1CrMoV steel for HP steam turbine rotor materials were investigated. The super-clean 9CrMoV steel showed a superior high-temperature oxidation resistance with very small oxidation rates even though at 630°C, because the oxidation was restrained by the Cr-oxides formed near the base metal. On the other hand, the oxide scales formed on the 1CrMoV steel were composed of Fe-oxides, and the oxidation rate increased remarkably at the temperatures above 610°C.
Development of Economic-Type X70 Linepipe Steel Hot Strip
Authors: Yang Hong Mei
Published: August 2013

In order to reduce the production cost, economic-type X70 pipeline steels with the thickness of 14.6 and 15.9mm were redesigned . The latest alloy system of pipeline steel designed by non-molybdenum C-Mn-Cr-Nb alloy system, which replaces the high-molybdenum C-Mn-Mo-Nb alloy system, was adopted along with acicular ferrite microstructure. The microstructure of X70 strip is homogeneous and ferrite grains are fine, resulting in high strength, excellent low-temperature toughness and weldability.
The Galvanic Corrosion Behaviors of 13Cr-N80 Steel Couples in NaCl Solution at Different Temperature
Authors: Wu Ling , Xie Fa Qin , Yao Xiao Fei
Published: August 2013

Electrochemical method was employed to investigate galvanic corrosion behaviors of super13Cr and N80 couples in 5% NaCl solution at different temperature. Corrosion morphologies and products of the couples were analyzed by SEM, EDS and XRD. The results show that there existed distinct potential difference between super13Cr and N80 with different degree of corrosion in 5% NaCl solution at different temperature. N80 was accelerated to corrode as anode, however, super 13Cr was protected as cathode when their coupling. In order to avoid galvanic corrosion, the super 13Cr-N80 couples could not be used without any protection of N80 from 25°C to 80°C. Corrosion current density of the super13Cr-N80 couples increased with increasing temperature in 5% NaCl solution, as well as the more serious corrosion of N80, of which corrosion products are Fe3O4.
Dendrite Grow up Relations with Cooling Speed
Authors: Zhang Qing Jun , Yan Chun Liang , Cui Zhi Min , Wu Yao Guang
Published: August 2013

Using confocal laser microscope with an infrared heater for 45 steel under different rate of solidification dendrite formation in the process of in situ observation, in the melt solidification phase has different cooling rate the cooling of dendrite formation, analysis of cooling rate on final solidified structure. Results show that with the reduction of temperature in the solidification process dendrite growth continuously, new nuclear has been formed, with the speeding up of the cooling rate, the dendritic structure refinement.
Study on Defect Complexes in High-K Sr and Zr Co-Doped BaTiO3 Ceramics
Authors: Lu Da Yong , Sun Xiu Yun
Published: August 2013

In order to investigate the evidence for the formation of Sr2+-Zr4+ defect complexes in high-k Sr and Zr co-doped BaTiO3 ceramics, BaTiO3, (Ba0.85Sr0.15)TiO3, Ba (Ti0.8Zr0.2)O3, and (Ba0.85Sr0.15)(Ti0.8Zr0.2)O3 (BS15TZ20) ceramics were prepared using a mixed oxide method. The Y5V-type BS15TZ20 shows a high-k diffuse phase transition behavior (ε ́m = 8000) and its Curie peak occurs near room temperature. The evolution in crystal structure and in dielectric property for the four samples gives four evidences for the formation of Sr2+-Zr4+ defect complexes in BS15TZ20. The splitting of the 720 cm-1 Raman band does not relate to Sr2+-Zr4+ defect complexes, but to a multiphonon (A1 (TO2) + A1 (TO3)).
Influence of Nano-Yb2O3, Nano-Nd2O3 and Nano-Dy2O3 on Sintering and Crystallization of Fused Quartz Ceramic Materials
Authors: Gu Ying Lei , Bu Jing Long , Ma Chao , Zhao Dong Mei , Wang Zhi Fa
Published: August 2013

Fused quartz powder (d50=19μm) was used as raw material, nano-Yb2O3, nano-Nd2O3 and nano-Dy2O3 were dividedly used as additive with dosages of 3% each. Fused quartz ceramic materials were sintered in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1h. The influence of rare earth nanooxides on sintering and crystallization of the fused quartz ceramic were researched by measurements of apparent porosity, bending strength and thermal expansion ratios, and analyses of XRD and SEM. The results showed that samples added nano-Yb2O3 and nano-Nd2O3 have lower apparent porosity, higher bending strength and lower thermal expansion rate. It can be deduced that additives nano-Yb2O3 and nano-Nd2O3 have obvious effect on facilitating sintering and inhibiting crystallization of fused quartz materials at experimental temperatures.
Research in Toughening Wear-Resistant of Alumina Ceramic
Authors: Zheng Zhan Shen , Geng Sen , Yang Rong
Published: August 2013

This article describes the alumina ceramic mixed with two kinds of additives in order to improve the performance of ceramic, such as mixed with submicron ZrO2 and MnO2 Monoclinic zirconia (m-ZrO2) and tetragonal zirconia (t-ZrO2) of reversible phase transition of volume change is used to improve the toughness and wear resistance of composite alumina ceramic. Through doing various tests about fired products, including hardness testing, SEM test and bulk density measurement, we can understand the microstructure and mechanical properties of samples.
Vickers Hardness of Multi-Wall Carbon Nanotube Reinforced Alumina
Authors: Zhang Jin Yong , Xu Chong Jun , Todd Richard , Fu Zheng Yi
Published: August 2013

Reliability of indentation method in carbon nanotube reinforced ceramics had been proposed in some works, especially of indentation toughness. In this work the traditional indentation hardness of the Multi-wall carbon Nanotube reinforced alumina composites was studied. It is found that the Vickers hardness and nanoindentation hardness of MWNT reinforced alumina fabricated by SPS decreased from about 20GPa to 16GPa at a critical load force about 1kg. While pure alumina showed a Vickers hardness of 20.6GPa in the whole load force range. When the load force or displacement into surface increasing, continuous recorded hardness, contact stiffness and modulus of the MWNT reinforced alumina showed quite different behavior compared with the pure alumina, especially at middle period of indentation. It was believed that different properties in vertical and horizontal directions of the MWNT were the key. MWNT was compressed and deformed as a soften component in the whole indentation processing. And tensile stress caused by MWNT in composite became significant until an enough strain attained and decreased when a critical stress was over. The results mean the definition of hardness or similar ones seemed need deep description in this type of material.
Effects of Magnesia Fines on Physical Properties of Al2O3-MgO Unfired Bricks
Authors: Wei Jun Cong , Niu Sen Sen , Wang Yi Long , Ma Wei Ping , Tu Jun Bo
Published: August 2013

Al2O3-MgO unfired bricks were prepared by using brown corundum, white corundum, fused magnesia and α-A12O3 micropowder as main starting materials, Al2O3-SiO2 gel powder as a binder. The effects of magnesia fines addition on physical performance of Al2O3-MgO unfired bricks were investigated. The phase composition and microstructure were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). The results showed that with the increase of magnesia fines addition, bulk density of Al2O3-MgO unfired bricks after dried decreased and strength increased. After heat treatment at 1100 °C, apparent porosity (AP) slightly reduced, bulk density (BD) slightly increased. Strength had little change. After heat treatment at 1500 °C, AP first decreased and then increased, and strength change correspondingly. The hot modulus of rupture (HMOR) first increased and then decreased with increasing magnesia content. The optimum magnesia addition is at 6.0 wt. %.
The Study of CaO-SiO2-B2O3-Al2O3-La2O3 Glass Ceramics as Sealant for Planar Intermediate Temperature Solid Oxide Fuel Cells
Authors: Yu Jie , Yang Jian Jun , Ma Wen Hui , Yu Bo , Li Rui , Xing Jie , Qian Biao , Ning Ping
Published: August 2013

CaO-SiO2-B2O3-Al2O3-La2O3 system sealants with different B/Si ratios of 0.38~0.82 were prepared by high-temperature melting method for intermediate temperature solid oxide fuel cell (ITSOFC). The glass transition temperature (Tg) and softening temperature (Ts) of the sealant were analyzed by TG-DSC. The complex phases of the sealants detected by XRD were consistent with the calculation results generally. The resistivity of the sealants tested by electrochemical workstation was above 65 kΩ·cm2, and the wetting angle was also calculated. The prepared sealants basically meet the sealing requirement for ITSOFC.
Research Progress of Mg-Al Based Alloys
Authors: Song Xiao Jie , Li Quan An , Fu San Ling , Liu Wen Jian , Chen Zhi
Published: August 2013

Magnesium alloys as the emerging commercial metal structure material have excellent specific properties and stability, which is more and more vital for researcher. This paper reviews the creep characteristics and the way to enhance the elevated temperature properties of Mg-Al based alloys. The current Mg-Al based alloys (including AZ, AM, AS, AE, etc.) are summarized. The future development direction is pointed.
Effect of T6 Heat Treatment on Dry Sliding Frictional Wear Characteristics of Al-20Si-5Cu Alloy
Authors: Jin Yun Xue , Tong Qiang Qiang , Wang Xiao Ya , Chen Hong Mei
Published: August 2013

The effect of T6 heat treatment on dry sliding friction and wear characteristics of Al-20Si-5Cu under a fixed sliding speed of 200r/min and sliding time of 30mins was illustrated in this paper. The result reveals that T6 heat treatment can improve morphology of primary Si and Al2Cu particles, enhance the hardness of the matrix. Wear rate increased with increasing of applied load. T6 heat treated samples have high wear resistance which is related to the improvement of microstructure, particularly with their increased hardness of matrix. But friction coefficient varies with heat treatment processes and has no sensitivity to applied loads, which fluctuates in a small range, so the friction coefficient can be considered to be stable. The wear mechanisms of T6 heat treated samples are also changed with increasing of applied load, from oxidative wear to fatigue wear.
Influence of Aging Time on Mg-8Al-1Zn-3Ca Alloy
Authors: Liu Wen Jian , Li Quan An , Chen Zhi
Published: August 2013

The microstructure and mechanical properties of Mg-8Al-1Zn-3Ca magnesium alloy aged for different time are investigated. With the increase of aging time, the high melting point intermetallic compounds Al2Ca and Al4Ca are increased obviously in number and the phase of Mg17Al12 has a dramatic decrease in number. The longer aging time results in a significant segregation phenomenon. The second phase becomes coarsen, and mechanical properties decline.
Microstructure and Mechanical Properties of Mg-12Gd-2Y-2Sm-0.5Zr Alloy
Authors: Chen Zhi , Li Quan An , Liu Wen Jian , Song Xiao Jie
Published: August 2013

The Mg-12Gd-2Y-2Sm-0.5Zr (wt.%) alloy was prepared by induction melting. After solution and aging treatment, the microstructure and mechanical properties of alloy was investigated by optical microscope, XRD and tensile tests. The results show that the aged alloy is mainly composed by α-Mg matrix, Mg24Y5 and Mg5Gd phase, and these precipitated phases distribute in the grain dispersively. The mechanical properties of alloy were tested at room temperature and 200-300°C.
Effects of Hydrogen on Diffusion Bonding of TiAl-Based Intermetallics with Hydrogenated Ti6AI4V Alloy Interlayer Containing 0.5wt% Hydrogen
Authors: Jia Lei , Fan Long
Published: August 2013

The direct diffusion bonding of TiAl-based intermetallics and the diffusion bonding of TiAl-based intermetallics with hydrogenated Ti6Al4V alloys interlayer containing 0.5wt% hydrogen were carried out. The effects of hydrogen on diffusion bonding were investigated by SEM, EPMA, XRD, TEM and TG/DSC. The good joint was formed at 850°C for 15 min under a pressure of 15MPa at the diffusion bonding of TiAl-based intermetallics with hydrogenated Ti6Al4V alloy interlayer containing 0.5wt% hydrogen, and the room temperature shear strength was up to 290MPa. Relatived to direct diffusion bonding of TiAl-based intermetallic, the bonding parameters decreased prodigiously. According to the experimental observations, the Ti6Al4V alloy hydrogenated 0.5 wt% consisted of close-packed hexagonal structure α′ martensite phase, face-centered cubic structure of δ-phase, α and βH structure. The lamellar δ hydride and βH phase disappeared after bonding, and the lamellar (α+β) structure were formed. Because of the dehydrogenation during bonding, metastable hydride containing low hydrogen appeared. The remaining hydrogen in Ti6Al4V alloy at high temperatures enhanced the capacity of the plastic deformation and the diffusion ability of the alloy elements, which helped to improve the spread of the atom.
Study on Structure Properties Casted with Mg-Y-Nd-Gd-Zn-Zr Magnesium Alloy
Authors: Huang Zhi Wei , Zhao Gao Zhan , Wan Yuan Yuan , Tao Jian Quan
Published: August 2013

Mg-Y-Nd-Gd-Zn-Zr magnesium alloys with six different compositions are prepared through sand casting. A research shall be conducted on the casting structure and mechanical properties at room temperature of this magnesium alloys and the effect of main alloying rare earth elements of Y, Gd and Nd is researched through analysis on the test data of mechanical properties. It is seen from the research: In as-as-cast alloys, Y and Gd have a larger solid solubility, which are tend to uniform distribution in the alloy but there is much more Nd to precipitate. The second phase is mainly covered by Mg12Nd and a few of Mg24Y5 and Mg5Gd which are in form of block, globularity and strip. After T6 treatment, a large number of intermetallic compounds of Mg24Y5 with Y are precipitated from the alloy and the second phase has changed significantly in size and morphology which is uniformly and widely distributed in the grain and grain boundary with a good strengthening effect. When a few of Gd is added, the strength and plasticity of matrix alloy are improved. With the adding of Gd, the precipitated phase of microstructure is also increased which is tend to coarsening and segregation so as to have an effect on its mechanical properties.
The Effect of Sr Modification on the Microstructure and Properties of Mg2Si Reinforced Near-Eutectic Al-Si Alloy
Authors: Liu Yong Tian , Lin Ji Xing , Wu Xv Peng , Niu Li Yuan , Li Guang Yu
Published: August 2013

The effect of Al-10Sr master alloy modifier with different content on the microstructure and properties of as-cast Al-12.6Si-0.35 Mg alloy was investigated. The results show that, eutectic silicon varies from original needle and flake to fibrous shape; The shape, size, and quantity of α -Al all changed; When Sr content is 0.023%, the modification effect is most ideal, α -Al shows the highest quantity and smallest size. Meanwhile, the tensile strength and elongation of the alloy reach to the optimum values of 248.2 MPa and 7.2% respectively. These two values are 1.34 and 2.77 times higher than the 185 MPa and 2.6% before modification respectively.
High-Temperature Oxidation Behavior of Cu-20Ni-75Co Alloy
Authors: Cao Zhong Qiu , Li Feng Chun , Shen Ying
Published: August 2013

The oxidation of a ternary Cu-Ni-Co alloy containing about 20 at.% Ni and 75 at.% Co, balance Cu (Cu-20Ni-75Co), was studied at 600-800°C in 0.1MPa pure O2. The kinetic curves for the present alloy are irregular and deviate from the parabolic rate law and are composed of three quasi-parabolic stages. The oxidation rates decrease continuously with time more rapidly than required by the parabolic rate law. These indicate that the scales become more protective with the increment of time. The oxidation rates of the present alloy increase with the increment of temperature. Cu-20Ni-75Co alloy formed a dark external layer composed of Co3O4 followed by a slightly lighter internal layer of CoO. Obviously, adding 20 at% Ni to Cu-75Co alloy is able to decrease the critical Co content required to form the most stable oxide and finish a transformation from the mix internal oxidation to the formation of the exclusive external scales of Co oxides.
Mechanical Properties of Thermoplastic Composites via In Situ Polymerization from Cyclic Oligomers
Authors: Hao Kou An , Wang Zhen Qing , Zhou Li Min
Published: August 2013

Fiber impregnation has been the main obstacle for thermoplastic matrix with high viscosity. This problem could be surmounted by adapting low viscous polymeric precursors Woven basalt fabric reinforced poly (butylenes terephthalate) composites were produced via in-situ polymerization at T=210°C. Before polymerization, catalyst was introduced to the reinforcement surface with different concentration. DSC is used to determine the polymerization and crystallization. SEM is used to detect whether the catalyst existed on surface. Both flexural and short-beam shear test are employed to study the corresponding mechanical properties.
Research on Isothermal Phase Transformation Kinetics of TC21 Alloy
Authors: Wang Qing Feng , Zhu Cai Chao , Xin De Zhong , Zhang Ming Jin , Wang Xi Wei
Published: August 2013

The kinetics of the martensite decomposition in TC21 alloy under isothermal conditions has been studied using dilatometry technique. The typical morphologies of decomposition products were also directly observed. At 500°C and 550°C, the mechanism of martensite decomposition occur by, at temperature between 600°C and 750°C, the martensite decompose by . up 800°C, the martensite directly transform to α and β phase. Time–temperature–transformation diagram with iso-lines tracing the amount of the martensite decomposition have been established.
Valence Electron Structures Analysis on Relationship of Cu Physical or Mechanical Properties and Vacancy
Authors: Wang Yunfei , Li Yun Kai , Xia Ming
Published: August 2013

For the purpose of studying vacancy effect on physics and mechanics property, authors advance a method of calculating mono-vacancy cell valence construction, and get 5 phase construction factors nAF andα on electron layer. It indicates that vacancy increase electrical resistivity and intensity, and decrease plasticity, which are consistent with experiments. The paper open out the relation between vacancy and physics and mechanics property on electron layer.
Study on the Effect of the Temperature Rise of Rubber Compound on Tread Rubber Quality during Mixing Process
Authors: Chen Ke Juan , Xu Sha , Xu Da Liang
Published: August 2013

With the method of two-stage mixing, two different tread rubbers have been mixed in internal mixer under the different process conditions. After the experiments, test the temperature rise of rubber compound, mooney viscosity and carbon black disperisity. Study the effect of process condition change on the temperature rise of two kinds of rubber compounds and analyze the relationships between the rubber temperature rise and mooney viscosity, carbon black dispersity. The study finds that the temperature rise of rubber compound has a relationship with the rotor speed of internal mixer, rubber viscosity and filling factors, but when the temperature rise of rubber compound is steady, the carbon black dispersity of rubber compound also can be steady. After two-stage mixing, carbon black dispersity of rubber compounds have been improved obviously. These results also imply that rotor speed of internal mixer and filling factor are very important to carbon black dispersity of rubber compounds.
Effect of Types of Antioxidants on Crosslink Density and Tensile Properties of Epoxidized Natural Rubber
Authors: Yang Chang Jin , Luo Yong Yue , Chen Bang Qian , Xu Kui , Zhong Jie Ping , Peng Zheng , Wang Feng Xiang
Published: August 2013

The crosslink density and tensile property of epoxidized natural rubber containing 25 mol % expoxidation (ENR25) with different four antioxidants was investigated. The four antioxidants, viz., poly-2,2,4-trimethyl-1,2-dihydroquinoline (RD), N-isopropyl-N'-phenyl-p-phenyl-enediamine (4010NA) , N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenedianine (4020) and 2-mercaptobenzimidazole (MB) were used. The results indicate that the ENR25 vulcanizates with antioxidant 4020 exhibit the higher crosslink density and tensile property, the best thermal oxidation aging resistance.
Preparation for PTFE Hollow Fiber Membranes Used in Water Treatment and Optimization for its Extrusion Process
Authors: Zhuang Chao , Luo Zhi Qing , Chen Wen Qing
Published: August 2013

For their excellent physical and chemical properties, PTFE hollow fiber membranes can be used in harsh environment of water treatment. But the membranes cannot be prepared by conventional methods, such as the melting processing methods and the dry-wet spinning processing methods, because of a high melting point of 327°C and chemical stability. In this paper a method of extrusion-stretching-sintering is used, and using this method we get the membranes with high fracture strength (10MPa) and high pure water flux (1500L/(m2*h)), also the retention rate of bovine serum albumin reaching 50%, which meets the laboratory microfiltration membrane requirements.
The Crystallization Properties of PET Obtained by Using the Attapulgite-Supported Aluminum Oxide Hydroxide Catalyst
Authors: Lin Qing Hui , Gu Xiao Hua , Chen Da Jun
Published: August 2013

A nanocomposite catalyst was prepared from immobilization of aluminum oxide hydroxide onto the attapulgite for synthesis of Poly (ethylene terephthalate) (PET). Differential scanning calorimetry (DSC) analysis was used to investigate the crystallization properties of PET obtained by using the different catalysts, and the results showed that PET obtained by using the as-prepared catalyst exhibited higher crystallization crystallizability under applied conditions.
Synthesis and Mesomorphic Behavior of Chiral Liquid Crystalline Elastomers Derived from (S)-(-)-2-Methyl-1-Butanol
Authors: Jia Ying Gang , Han Lu Juan , Sun Ting , He Xiao Zhi
Published: August 2013

The synthesis of new chiral monomer 4-((4-(allyloxy) benzoyl) oxy) phenyl (S)-4-(2-methylbutoxy) benzoate (Mch), crosslinking agent hexane-1,6-diyl diacrylate (CA), and liquid crystal polymer elastomers (E1-E7) containing (S)-(-)-2-Methyl-1-butyl group is presented. The phase behavior and mesomorphism of the polymers were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and x-ray diffraction. The effect of the content of crosslinking units on the phase behavior and mesomorphism of elastomers was discussed. The chiral LCEs (E1-E7) exhibited elasticity, reversible phase transitions, and cholesteric Grandjean texture. The experimental results demonstrated that the glass transition temperature and isotropic temperature of Chiral LCEs decreased with increasing the content of crosslinking agent, but the cholesteric phase was not disturbed.
Preparation and Nonlinear Optical Property of Triazole-Based Fluorene Functional Polymer
Authors: Ji Xiao Li , Guang Shan Yi , Su Xin Yan , Xu Hong Yao
Published: August 2013

The controllable preparation of nonlinear optical polymers is still one of the research hotspots on nonlinear optical field. In this paper, a triazole functional polymer was designed and achieved by high-efficiency click chemistry method. The structure and properties of the polymer was characterized and evaluated with FTIR, NMR, UV, FL, DLLS and nonlinear optical analyses. The results exhibited that the polymer was successfully synthesized and has favorable nonlinear optical property, its third-order nonlinearity up to 3.66×10-10 esu.
Synthesis of Zn0.2Ca0.8TiO3:0.1Pr3+ by Sol-Gel and its Luminescence Characterization
Authors: Shen Yi , Han Li Ying , Hou Lu Yao
Published: August 2013

The Zn0.2Ca0.8TiO3:0.1Pr3+ luminescent materials were prepared by sol-gel technology. The phase transformation of gel was studied by TG-DTA and XRD in heat treatment process. The luminescent properties of phosphor in different calcination temperatures were determined by fluorescence spectrophotometer, and then the best sintering temperature was confirmed. The luminescent properties of phosphor was obtained through the emission/ excitation spectra. The surface appearance measured with SEM. The results showed that the nanoZn0.2Ca0.8TiO3:0.1Pr3+ phosphor could be obtained by sol-gel, sintering at 900°C. It sent out red fluorescent under the Ultra Violet. This characteristic emission peak at 614nm is associated with the typical 1D23H4 transition of Pr3+ion.
Design of Diffuse Reflection Composites and Study on Reflectivity Properties
Authors: Li Shi Bao , Wu Da Ming , Zheng Xiu Ting , Liu Ying , Wei Hai Long
Published: August 2013

According to the law of light propagation, this thesis analyzed that added reflective particles in the material can improve materials reflectivity properties. Established the model by the optical design software Light Tools to simulate, predicted the law of materials reflectivity properties changing with particle parameters. Chosen TiO2 as the reflective particles to test, the result shown that when the TiO2 content reached a certain proportion, the reflectivity and diffuse reflection of diffuse reflection composites can reach 91% and 88% respectively, the illumination uniformity can reach 60%.
The Preparation and Characterization of Novel Nonlinear Optical Active Dye
Authors: Li Lin Feng , Xu Hong Yao
Published: August 2013

A novel nonlinear optical active triazine dye 2-(4-methyl-4-amino-azobenzene )-4-sodium sulfanilate-6-chloro-1,3,5-triazine was synthesized by condensation reaction and characterized by FTIR, 1HNMR, respectively. Their nonlinear optical properties were investigated using 5 ns pulse at 532 nm, which showed excellent nonlinear optical property.
The Design of the Polymer Diffuse Material with Microstructure and the Research of the Reflection Properties of Materials
Authors: Li Shi Bao , Wu Da Ming , Zheng Xiu Ting , Liu Ying , Gao Xiao Long
Published: August 2013

It can increase the utilization rate of light energy and improve the reflection properties of materials by adding order of micro lens array on the material surface microstructure. The models to predict the change of material reflection properties with microstructure radius, height and arrangement was been established based on the optical design software Light Tools. By adding high refractive index TiO2 into the diffuse material with microstructure, the reflection properties of materials can been improved again. The results of the diffuse material molding test showed that the microstructure and its composite material had good reflection performance, reflection and diffuse reflection ratio could reach 93% and 93%, and the illumination uniformity could reach 63%.
Synthesis and Millimeter Wave Attenuation Properties of the FeCl3-Graphite Intercalation Compound
Authors: Zhou Ming Shan , Zhang Yong Ming
Published: August 2013

The graphite intercalation compound with large exfoliated volume was prepared by chemical oxidation method. The experimental parameters on the exfoliated volume were discussed in detail. It was found that the optimum preparing conditions went as follows: the mass ratio of graphite flakes:C2H5COOH:FeCl3:CrO3=1:2.8:0.3:0.2, the reaction temperature and time were 30 °C and 40 minutes, respectively. The exfoliated volume of GIC reached up to 575 mL·g1 in the conditions. The composition, structure and properties of the graphite intercalation compound were characterized and analyzed by SEM, TG, DSC, VSM techniques. The millimeter wave (MMW) attenuation performances of GIC were investigated by MMW radar measurement device. The results showed that the MMW attenuation properties of FeCl3-GIC are batter than H2SO4-GIC because of its magnetic absorption for millimeter wave.
Magnetic Phase Transition and Magnetic Proporties of LaFe11.6Si1.4Bx Compounds
Authors: Xie Kun , Liu Yin , Cao Mei Qing , Xia Peng Cheng , Yue Li Jie
Published: August 2013

The magnetic phase transition and magnetic entropy change of melt-spun LaFe11.6Si1.4Bx (x=0.0, 0.3, 0.5, 0.7) ribbons were investigated by measuring the magnetization as the function of temperature. Comparing with LaFe11.6Si1.4, the NaZn13-type structure of LaFe11.6Si1.4Bx did not change after introducing B atoms, while the amount of α-Fe phase in the ribbons significantly decreased. The Curie temperature slightly changes after the addition of B. The LaFe11.6Si1.4Bx (x=0.3, 0.5) exhibits first-order magnetic transition and large magnetic entropy change as observed in LaFe11.6Si1.4 compound.
Effect of La Contents on La-Doped Bi2Ti2O7 Dielectric Thin Films
Authors: Yang Xue Na , Liu Jian An , Huang Bai Biao , Gao Si Jiang
Published: August 2013

La-doped (Bi1-xLax)2Ti2O7 (BLTO) thin films with different La contents have been grown by CSD method. All the XRD patterns of the samples showed that the films were polycrystalline films. The intensities of the peaks decreased with the increasing of La contents. The general trend of the changes of leakage current was decreased with the increasing of x. The case of dielectric constant as a function of La content is complicated. The rule of change of the dielectric constant is different with different la contents. In view of dielectric constant and dielectric loss, we think that the film of x=0.2 has relative low leakage current and high dielectric constant, which is considered to be adequate for a DRAM.
Band-Tailored InAs/GaSb Superlattice in Infrared Application
Authors: Guo Jie , Hao Rui Ting , Zhao Qian Run , Man Shi Qing
Published: August 2013

The energy band structure of InAs/GaSb superlattice can be tailored by changing the thickness of InAs or GaSb layer thickness. Different superlattice as InAs/GaSb (4ML/8ML, 8ML/8ML and 16ML/7ML) for cut-off wavelengths from short to long IR wavelength were designed and deposited on GaSb substrates by melocular beam epitaxy system. The lattice mismatch was below 1000ppm under the careful Ga1-xInx- type interface control. The responsitivity revealed the band structure in InAs/GaSb superlattice can be tailored and the cutoff wavelength was from 2.5μm to 11μm. The current-voltage relation and the differential resistance in infrared photodiode were also measured and studied.
Full-Potential Study of the Magneto-Optical Kerr Effect for AuMnSb and AuMnSn
Authors: Shang Xue Fu , Wang Ya Wei , Tan Ming Qiu
Published: August 2013

The magneto-optical Kerr effect (MOKE) for both Heusler type alloys (AuMnSb and AuMnSn) were studied using the full-potential linearized augmented plane-wave (FP-LAPW) method, based on the density functional theory implemented in the WIEN2k code. The differences with previous calculations on the Kerr spectra have been found explicitly. At proper Lorentzian such as δ = 0.4 eV, the calculated Kerr angle of AuMnSn reaches its maxima +0.3° near 0.6 eV and-0.5° at 5.2 eV, respectively while the MOKE spectra of AuMnSb exhibit less prominent Peaks (+0.5° at 0.3 eV, -1.9° at 0.9 eV, -1.0° at 2.4 eV and-2.0° at 5.3 eV). The results on the spectra in this work showed quite a lot differences with all previous all-electron calculations. It is concluded that the contribution from Sb (or Sn) site to the magneto-optical kerr effect is quite crucial in Heuslar alloys.
Polycrystalline Silicon Films on SiO2 Substrate Treated by Excimer Laser Annealing
Authors: Duan Chun Yan , Ai Bin , Li Rong Xue , Liu Chao , Lai Jian Jun , Deng You Jun , Shen Hui
Published: August 2013

Selected area laser-annealed polycrystalline silicon (p-Si) thin films were prepared by a 248 nm excimer laser. 1 μm thick p-Si films with grain size less than 100 nm were deposited on SiO2 substrate by chemical vapor deposition using atmospheric pressure (APCVD). Grain sizes before and after annealing was examined by scanning electron microscopy (SEM) and the mechanism of grain growth was discussed in detail. The maximum grain size of a selected area laser-annealed p-Si film can be increased from 100 nm up to 2.9 μm on SiO2 substrate by using appropriate laser energy densities. It indicated that silicon grains in laser-annealed regions had grown up competitively with three stages.
Effect of Yttrium Oxide on the Viscosity and Crystallization of Borosilicate Glass at High Temperature
Authors: Tian Zhong Qing , Zhu Yu Kai , Huang Wei Jiu
Published: August 2013

Effect of Y2O3 on the viscosity and Crystallization of of borosilicate glass at high temperature was investigated at high temperature. Melt viscosity as a function of temperature was determined by using a rotating spindle viscometer. Liquidus temperature was determined by the Gradient Furnace Method. The results show that the viscosity decreased as a function of Y2O3 content. The activation energy of glass without Y2O3 is about 110.3 kJ·mol-1 and the activation energy increases with the Y2O3 addition up to the 2 wt%. At 2 wt% Y2O3, the specimen shows the maximum activation energy value of 112.6 kJ·mol-1. As Y2O3 content increase, the activation energy decreases. The fiber-forming temperature of glass without Y2O3 is about 1342 oC and the fiber-forming temperature increases with the Y2O3 addition up to the 2 wt%. At 2 wt% Y2O3, the sample shows the maximum activation energy value of 1370 °C. When Y2O3 content increase, the fiber-forming temperature decreases. The liquidus temperature of glass decreases from 1313 °C to 1023 °C when Y2O3 content increases from 0 wt% to 6 wt%. The difference between the fiber-forming and the liquidus temperatures of glass increases from 30 oC to 336 °C when Y2O3 content increases from 0 wt% to 6 wt%.
Anisotropic Magnetoresistance Effect: General Expression of AMR Ratio and Intuitive Explanation for Sign of AMR Ratio
Authors: Kokado Satoshi , Tsunoda Masakiyo
Published: August 2013

We derive the general expression of the anisotropic magnetoresistance (AMR) ratio of ferromagnets for a relative angle between the magnetization direction and the current direction. We here use the two-current model for a system consisting of a spin-polarized conduction state (s) and localized d states (d) with spin-orbit interaction. Using the expression, we analyze the AMR ratios of Ni and a half-metallic ferromagnet. These results correspond well to the respective experimental results. In addition, we give an intuitive explanation about a relation between the sign of the AMR ratio and the s-d scattering process.
Hot Compression Performance of TiC10/Cu-Al2O3 Composite Prepared by Vacuum Hot-Pressed Sintering
Authors: Yang Zhi Qiang , Liu Yong , Tian Bao Hong , Zhang Yi
Published: August 2013

Use VDBF-250 vacuum hot pressing sintering furnace TiC10/Cu-Al2O3 composite was prepared by vacuum-pressed sintering. In the cold isotatic pressing machine for sintering state sample was cold isostatic pressing and detection performance. Using the Gleeble-1500D simulator, the high-temperature plastic deformation behavior of TiC10/Cu-Al2O3 composite was investigated at 450850°C with the strain rate of 0.0011s1 and total strain of 0.7 the dynamic recrystallization behavior of the composite was studied. The results show that the density, microhardness and electrical conductivity of the composite are 98.53%, 161HV and 48.7%IACS. After the isostatic cool pressing, The comprehensive performance of the material were improved. The softening mechanism of the dynamic recrystallization is a feature of high-temperature flow stressstrain curves of the composites, and the peak stress increases with the decrease of deformation temperature or the increase of strain rate, and Belong to temperature and strain rate sensitive material.
Polarization Properties of a Nano-Particle Array Grating on GaN-Based LED
Authors: Xing He , Cao Bing , Zhang Gui Ju , Wang Chin Hua , Yu Qiang , He Shun Yu , Zhang Ji Cai , Wang Jian Feng , Xu Ke
Published: August 2013

A nano-particle array grating is proposed to achieve fine polarized output and transmittance on GaN-based LED. This nanostructure enables simple fabrication, since the novel arrays can be directly coated on the surface of GaN. In this letter, Aluminum nano-particle array gratings are optimized at blue and green band respectively. Extinction ratio up to 26dB and a TM polarized transmittance of 76% are achieved. Theoretical results show the nano-particle grating can be a guidance in designing the integrated GaN based and polarized photonic devices. Numerical simulations are performed using the Finite-difference time-domain (FDTD) solutions.
Performance and Design of an SRM with Amorphous Stator
Authors: Xiang Qian Wen , Ji Xiao Fu , Sun Yu Kun
Published: August 2013

The performance of the switched reluctance motor (SRM) greatly depends on magnetic properties of core material since it consists of only laminated-core and windings. This paper analyses the performance of an SRM with amorphous stator, which has very low iron losses. Copper loss, iron loss and efficiency of the SRM are estimated by finite element method. Furthermore, a suitable structure for the SRM with amorphous stator is examined on the optimization design.
Analysis and Simulation of a New Type of Radial Deployable Structures
Authors: Zhang Hao , Zhou Chao Chao , Xie Xi Ling , Li Tao Tao
Published: August 2013

Against the application of spatial structure field, a configuration design about hexagonal radial deployable structures is presented, and illustrates its working principle. According to the characteristics of its motion, the moving space of the structure is analyzed; the mechanical property of the deployable mast is fully analyzed. The stretch and shrink of the deployable mast is simulated by ADAMS, and modal of hinge joint is analyzed by Partran . Results show that the new type of radial deployable structures is reasonable and reliable to promote.
Dynamic Analysis and Path Tracking Control of Deep-Sea Tracked Miner
Authors: Han Qing Jue , Liu Shao Jun
Published: August 2013

For the deep-sea mining system, tracked vehicle is widely used as a miner. From the data of characteristic of the seabed sediment, on which the miner is walking, the relationship of the traction force of the miner and the slip rate of the track is established. The soil-track interaction, an essential issue in tracked vehicle modeling, has been analyzed in detail. Then the kinematic model of the deep-sea tracked miner is established and a PID control strategy is presented to make the miner walk along the desired path. After a series of computer simulations in MATLAB, the validity of the control strategy is confirmed.
The Structure Optimization of Aluminum Alloy Automotive Wheels
Authors: Yang Bao An , Li Xu Hui , Yang Fei , Niu Zi Ru , Wang Zhi Hong
Published: August 2013

The aluminum alloy automotive wheels are widely used and their quality safety is vital. So their structure design should be optimized. Based on the wheel bending fatigue test and the analysis of aluminum alloy automotive wheel's structure characteristics, the wheel's load was discussed and the analysis of the wheel was done by using Solidworks and ANSYS. The analysis result provides scientific basis for the optimization design of the aluminum alloy automotive wheels.
Optimization of Machining Parameters for Parallel Turnings Using Estimation of Distribution Algorithms
Authors: Xie Shu Tong , Pan Li Fang
Published: August 2013

Optimal machining parameters can lead to considerable savings in manufacturing problems. In this paper, to deal with the nonlinear optimization problem of machining parameters which aims to minimize the unit production cost (UC) in parallel turnings, we propose a novel optimization approach which divides this complicated problem into several sub-problems. Then an estimation of distribution algorithm (EDA) is developed to search the optimal results for each sub-problem. Computer simulations show that the proposed approach is efficient in searching the optimal solutions to reduce significantly the unit production cost.
Research on Welding Torch Swing Control System Based on DSP
Authors: Shi Jin Shui
Published: August 2013

In actual welding process, swing welding was a very important way to improve the efficiency and quality of welding. This paper put forward a welding torch swing control system based on the DSP chip TMS320LF2407A, and described its structure, working principle, software implementation and anti-interference design. The control system could realize the swing welding methods set by control panel, control the running motor and swing motor motion, and could realize arbitrary adjustment of the welding torch swing parameters such as speed, amplitude and lag time. On site operation shows that the system is stable, high reliable and meets the demands of industrial field.
Study on 3D Model of Square Dome Shaped Pipe Based on AutoCAD
Authors: Liu Shi Ming
Published: August 2013

Two kinds of 3D modeling methods for square dome shaped pipe (SDSP) are presented in this paper, i.e. Manual modeling method by means of relative commands provided by AutoCAD and automatic modeling method by means of AutoLISP programming. The modeling steps are described in detail in the manual modeling method. Based on these, the 3D modeling application for SDSP is developed by means of AutoLISP language. The parameterized modeling of SDSP is achieved, and the drawing efficiency is increased effectively.
Research on Crashworthiness of Car Bumper System
Authors: Wu Xiu Chun , Tian Guo Hong , Liu Jie
Published: August 2013

The computer simulation method is used to study the crashworthiness of car bumper system. Firstly, the CAD model of the car and bumper system is established in CATIA. The pre-processing for the model is finished in Hyper-Mesh and the finite element model is established. Then the process of crash simulation is calculated in Pam-Crash. The simulation results are compared with the test results to verify the accuracy of the finite element model. Finally, the low-speed crash simulation of the bumper system is conducted. The crash displacement and deformation of the bumper system are forecast through the process of simulation, which can provide a reference for the next design and improvement.