bluuebunny/crossref_metadata_2025 huggingface dataset:
The Properties of YSZ-Ni-Cr Cermet Fabricated by Sol-Gel Method
Authors: Guo Shu Lan , Wang Min , Lv Su Hua , Li Jia , Du Xian Chang
Published: June 2012

The properties of YSZ-Ni-Cr cermet fabricated by Sol-Gel Method（YSZ-Ni-Cr powder was synthesized by coprecipitation method at 850°C for 2 h and was processed into YSZ-Ni-Cr cermet by hot-press sintering at 1350°C for 1 h）was explored. The identification of phases was carried out using a X-ray diffractometer (XRD). The particle size and morphology was determined by electron microscopys(SEM/TEM) The conductivity had a tendency to decrease with increasing temperature. This behavior can be accounted for that there are two conduction paths through the cermet, an electronic path through the (Ni,Cr) metal phase and an ionic path through the ZrO2-Y2O3 phase.
Study of Nb-Zn-Mn Co-Doped Ba(Ti,Zr)O3 Ceramics
Authors: Wang Yue Hui , Shen Jian Hong
Published: June 2012

The surface coating processing technique was utilized to modify hydrothermally synthesized Ba(Zr0.10Ti0.90)O3 (BZT) with Nb-organic compound and Zn-organic compound and Mn-organic in organmetallic precursor (Nb-EDTA and Zn-EDTA and Mn-EDTA), which were coated on the powders uniformly. The sintering temperature was decreased and dense ceramics were obtained with well-developed grain growth at 1300 0 C. With increasing the amount of (Nb2/3Zn1/3) from 0 to 1.3 mol%, the Curie temperature was monotonously lowered from 85 0C to 20 0C. The corresponding dielectric maximum decreased first and then increase. The shift rate of the phase transition point of (Nb2/3Zn1/3) codoped BZT was -48.5 0 C/mol%. With increasing of the amount of Mn, the Curie point temperature was lowered greatly, accompanied by a decrease in the corresponding dielectric maximum and an enhancement of the ferroelectric relaxor characteristic.
Fabrication and Effects of Different Average Grain Sizes on Thermal Conductivity of Nd:YAG Ceramics
Authors: Tian Sen , Cao Quan Xi , Wang Bo , Xu Fu Min
Published: June 2012

High quality, transparent 1.0at% Nd:YAG ceramics were fabricated successfully by a solid-state reaction and vacuum sintering, and the characteristics were also identified in different methods. The lowest transmittance is 44.85% and the highest is 71.98%. 9 samples were used for thermal diffusivity detecting using laser flash method. Thermal diffusivity decreases as temperature increases, and The diffusivity increases as average grain size grows. However, when average grain size is smaller than 8μm, the diffusivity decreases much faster. Mechanical advantages be ensured, the average grain size should be above 8μm.
Effect of Glass Additions on Ca[(Li1/3Nb2/3)0.92Zr0.08]O3−δ Microwave Ceramics
Authors: Xiong Hui , Xiong Gang , She Cui Hua
Published: June 2012

The effects of ZnO-B2O3-Na2O(ZBN) glass on the sinterability and microwave dielectric properties of Ca[(Li1/3Nb2/3)0.92Zr0.08]O3−δ ceramics were investigated . ZBN glass doping can effectively reduce sintering temperatue by 100~150°C. The temperature coefficient of resonator frequency τf increased with an increase of ZBN glass content and sintering temperatue. When ZBN glass of 1.8wt% were added, the optimum microwave dielectric properties: εr =22.1,Qf =18360GHz and τf = − 9.8×10−6/°C were obtained at the sintering temperature of 1000°C.
Abrasive Wear Characteristics of In Situ TiC-Reinforced Iron Matrix Surface Gradient Composites
Authors: Wang Liang Liang , Xu Yun Hua , Zhong Li Sheng
Published: June 2012

An in-situ synthesis process combining an infiltration casting with a following heating treatment was applied to fabricate special titanium carbide (TiC) particles-reinforced iron matrix surface gradient composites in this article. The microstructure and wear-resistance of the titanium carbide particle reinforced iron matrix surface gradient composites were researched by using differential scanning calorimetry, X-ray diffraction, scanning electron microscopy and abrasive wear testing. The results showed that two materials had been reacted completely between the titanium plate and gray cast iron, and the titanium carbide particles distributed in the matrix with the thickness of 266.7 μm reaction layer. The average size of titanium carbide between titanium plate and iron matrix was about 1-2μm. Under the same condition, the wear mechanism of titanium carbide particles-reinforced iron matrix surface gradient composites appeared as: micro-ploughing, micro-cutting and broken titanium carbide.
Microstructure and Toughening Mechanism of ZrO2 Ceramic
Authors: Wang Chen , Han Ya Ling , Guo Si Cong , Zhang Fu Sheng , Fu Hai Feng
Published: June 2012

In order to reduce its costs and increase its strength and toughness, 3Y-ZrO2/Al2O3 nanocomposite ceramics is fabricated through pressureless sintering process. Microstructure is detected by SEM and composition is analyzed by EDS. The results show that some of ZrO2 combined with Al2O3 forms ZrO2+Al2O3 solid solutions, and the others form particles which are distributed on grain boundaries and matrixes with different shapes. Those ZrO2 particles locating in the boundaries enhance the ceramic’s toughness by two modes: fracturing and tearing, and which one to be occur depends on the location relationship between load and boundary interface. The composition transition, i.e. the solid solution consisting of ZrO2+Al2O3 has formed encircling ZrO2 particles, and it has a positive contribution to ceramics toughness through the combination of chemical bond.
Effect of Different Nucleating Agents on the Microstructure and Properties of LMAS Glass-Ceramics
Authors: Jiang Wei Hui , Wu Yuan Fa , Liu Jian Min , Zhu Qing Xia , Tan Xun Yan , Bao Zhen Hong , Yu Peng Peng
Published: June 2012

Li2O-MgO-Al2O3-SiO2(LMAS) system glass-ceramics had been prepared by sintering method. The effect of different nucleating agents on the phase composition, microstructure and properties of LMAS system glass-ceramics were investigated by DTA, XRD and SEM. The results indicate that the introduction of nucleating agents could contribute to decreasing the crystallization temperature of the glass-ceramics, the effect of the nucleating agent TiO2 is most obvious, and the crystallization temperature is the lowest(798.9°C). Main crystal phase of the glass-ceramics without the nucleating agents is β-quartz solid solution, while main crystal phase of the glass-ceramics with different nucleating agents changes into β-spodumene solid solution. The glass-ceramics with composite nucleating agents (TiO2+ZrO2+P2O5) are the lowest coefficient of thermal expansion (0.86×10-6/°C)and the highest flexural strength (95MPa). Composite nucleating agents have the best effect of crystallization, and contribute to the formation of a large number of short columnar crystals, which is the main reason for obtaining glass-ceramics with low expansion coefficient and high flexural strength.
Influence of CeO2 and Sintering Parameters on the Performance of Vitrified Bond Diamond Abrasive
Authors: Zhao Guang Tao , Zhu Yu Mei , Li Zhi Hong , Lv Xing Fen
Published: June 2012

A kind of vitrified bond was selected to be sintered with diamond powders to prepare diamond abrasive. The effect of the additive of CeO2 and sintering parameters on the performance of vitrified bond diamond abrasive was investigated. The mechanical properties of diamond abrasives were tested on ZMC-Ⅱ type diamond static strength tester and the interfacial bonding states between diamond powders and vitrified bonds were studied by Scanning Electron Microscopy (SEM). The results indicated that CeO2 improved the performance of diamond abrasive by means of strengthening the bonding between diamond grits and vitrified bond. The admirable diamond abrasive was achieved when the sample was sintered at 800°C holding for 120min.
Preparation and Characterization of SrO-Fe2O3-FeO-SiO2-B2O3 System Hexaferrites Glass-Ceramics
Authors: Liu Jian An , Zhang Mei Mei , Yang Xue Na , He Wen
Published: June 2012

Based on the SrO-Fe2O3-FeO-SiO2-B2O3 system, the M-type strontium hexaferrites glass ceramics has been prepared through heat treating the melted glass. Using the aqueous solution solvent evaporation and melt method, we obtained the glass precursor of molecular-scale homogenously mixed compound. The precursor was completely melted in a lidded platinum crucible placed in an electric furnace at 1480°C for 1h and then annealed in a furnace at 550°C for 40min. The crystallization of the glass systems with different component has been systematically investigated by using X-ray diffraction (XRD), Transmission Electron Micrographs (TEM) as well as Vibrating Sample Magnetometer (VSM). It is found that Fe3O4 crystal precipitated during naturally cooling the melt from 1480°C to anneal temperature. Moreover, the hexaferrite glass ceramics with the main crystal phase of SrFe12O19 was obtained after heat-treated at 860°C for 2 hours. The magnetic properties of the obtained hexaferrite glass ceramics indicated that the saturation magnetization and the coercivity were 8.1A•m2/kg and 114KA/m, respectively.
Synthesis of CaO-Na2O-Fe2O3-FeO-B2O3-SiO2 Glass-Ceramics for Hyperthermia Application by Aqueous Solution-Melt Method
Authors: Liu Jian An , Zhang Mei Mei , Yang Xue Na , He Wen
Published: June 2012

Based on the CaO-Na2O-Fe2O3-FeO-B2O3-SiO2 system, the ferrimagnetic glass-ceramic has been prepared for hyperthermia application by aqueous aolution-melt method. Using the aqueous solution solvent evaporation, we obtained the molecular-scale homogenously glass precursor. The precursor was completely melted in a lidded platinum crucible placed in an electric furnace at 1480°C for 1h and then annealed in a furnace at 550°C for 40min.The annealed glasses were heat treated at 1050°C for 2h to obtain the glass-ceramics. The crystallization of the glass systems with different component has been systematically investigated by using XRD, TG, as well as Vibrating Sample Magnetometer (VSM). The glass-ceramics with B2O3=3.0wt% show a strong magnetic, which contains highest value of specific saturation magnetization of 28.34A•m2/kg.
Analysis of Copper and Copper Alloys Electric Components Short Circuited Melted Mark Metallographic Structure
Authors: Mo Shan Jun , Zhang Jun , Liang Jun , Yang Wen Bing
Published: June 2012

The current standard is lacking of characteristic criterion and references of various copper alloys material electric components short-circuited melted-mark metallographic structure, thus it is to the disadvantage of the development of fire investigation physical evidence identification. In the thesis, by conducting fire simulated experiments of primary short circuit and secondary short circuit with pure copper and brass alloys electric components, apply metallographic analysis methods and image processing technology to discuss and analyse the melted mark metallographic structure.
Study on the AZ31B Magnesium Alloy in the Application on High-Speed Trains
Authors: Liu Jia Zhen , Zhao Yan Hui , Song Lei , Xiang Zhong Xia
Published: June 2012

6063 aluminum alloys are used as the luggage rack’s material on high-speed trains recently. The study on the AZ31B magnesium alloy is aimed to demonstrate the feasibility of the magnesium alloy’s application as the material of the luggage rack on high-speed trains. First, the mechanical properties of the AZ31B magnesium was obtained after a series of experimental tests on basic mechanical properties of the AZ31B magnesium alloy. The results show that the strength of the magnesium alloy is 1.25 times of the 6063 aluminum alloy and the impact toughness of the AZ31B magnesium alloy is twice as much as the 6063 aluminum alloy. Second, the stress distribution and the maximum value of the equivalent stress in given loading conditions was obtained by finite element strength analysis on the structure of the aluminum alloy luggage rack on high-speed trains. And the FE analysis results indicate that if the AZ31B magnesium alloy is used as the material of the luggage rack instead of the 6063 aluminum alloy, it will have a weight loss of the luggage rack for approximately 33%. In addition, the application of AZ31B magnesium alloy has more advantages in energy-saving, environmental protection and safety control.
Microstructural Evolution of the [001] Oriented Single Crystal Superalloy DD6 Creep at 760°C and 785 MPa
Authors: Yu Jian , Li Jia Rong , Shi Zhen Xue , Zhao Jin Qian , Liu Shi Zhong , Han Mei
Published: June 2012

The creep and microstructures of DD6 single crystal superalloy with [001] orientation at 760°C and 785MPa were investigated. The results show that large a/2 dislocations are spread and concentrated in matrix channels during incubation period, and few of stacking faults are observed at later stage of incubation period. The stage of primary creep is characterized by the stacking faults shearing γ' phases, and the density of a/2 dislocations in the matrix continues to increase. The density of the stacking faults increases during the stages of secondary and tertiary creep.
Study on the Quenching Microstructure of Fe-0.36C-1.4B Alloy
Authors: Dong Yun Ju , Li Zhen Hua , Cen Qi Hong , Liu Mei Hong
Published: June 2012

The heat treatment microstructure of Fe-0.36C-1.4B alloy after austenitizing at 1000°C and water quenching then tempering at 200°C were studied by TEM and selected area diffraction. The results indicate that the alloy has typical microstructure of hypoeutectic cast iron because of boron addition. After quenching, the microstructure of the alloy was made up of martensite and B-containing carbide Fe23(C, B)6.
Ageing Precipitation and Strengthening Behavior of the Spray Formed Al-Zn-Mg-Cu Alloy
Authors: Liu Hong Wei , Wang Feng , Xiong Bai Qing , Zhang Yong An , Li Zhi Hui , Li Xi Wu
Published: June 2012

In this study, the Al-Zn-Mg-Cu alloy was prepared by spray forming process. The ageing precipitation and strengthening behavior of the spray formed Al-Zn-Mg-Cu alloy were studied by microhardness tests, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) .The results show that the main strengthening precipitates of the spray formed Al-Zn-Mg-Cu alloy are GPI (solute-rich clusters), GPII (vacancy-rich clusters) under peak aging condition. The effect of the microstructure on ageing hardness is controlled by the size and amount of the existing precipitates, and therefore depends critically on the ageing temperature and ageing time. Strength of this alloy is influenced significantly during natural ageing at room temperature, which is related to the dominant formation of GPI. During the initial stage of artificial ageing at 120°C, strong age-strengthening response is due to the formation of GP zones (both GPI and GPII ) .During later stages of artificial ageing , GPII precipitation is accelerated significantly but GPI is not affected clearly.
Effect of Rolling Deformation to Microstructure and Properties of Mg-8.5Li-1Al-1Ce Alloy
Authors: Tao Wang , Zhang Mi Lin , Zhao Shu Jin , Song Chun Mei , Ju Cheng
Published: June 2012

Mg-8.5Li-1Al-1Ce alloys were prepared with vacuum induction melting method. Uniaxial rolling deformation of alloys was obtained by two-roll milling. The effect of rolling deformation was studied on the microstructure and mechanical properties of Mg-8.5Li-1Al-1Ce. The results show that the microstructure morphologies of α-phase, β-phase and Al2Ce-phase go through different changes under different rolling percentages, and the mechanical properties are improved with increasing deformation. Besides the basal slip system, the prism and pyramidal slip systems are also activated in α(Mg) phase, with all the slip systems in β(Li) phase being uniformly activated.
Fatigue Behavior of GH4169 Alloy up to Very High Cycles
Authors: Zhao Xiao , Zhao Jian Jun , Liu Yong Jie
Published: June 2012

The present paper deals with experimental studies on the long life fatigue behavior of GH4169 alloy. Using the ultrasonic fatigue testing technique, specimens of hourglass shape were fatigue tested in air at room temperature under fully reversed cyclic loading conditions (R=-1). The very high cycle fatigue property of GH4169 alloy was studied and the initiation mechanisms of fatigue cracks were investigated and analyzed with scanning electron microscopy (SEM) and energy dispersive atomic X-ray (EDX). Preliminary results indicate that the S-N curve displays a bilinear decreasing tendency within 109 cycles and fatigue failure initiates from inclusions/defects on the specimen surface.
Effect of Ti Content on Microstructure and Hardness of A356 Alloy
Authors: Qu Min , Zheng Liu Bin , Zhao Ming , Li Ting Ting , Liu Feng Bin , He Guang Ping
Published: June 2012

In order to refine the microstructure of A356 alloy, the effect of different contents of Ti on A356 alloy was analyzed with scanning electron microscopy (SEM). Experimental results show that it is not following the law of the more the content of Ti is, the finer the microstructure in the range of 0% to 7.5% Ti. However, the microstructure undergoes a first refining as the content of Ti is less than 0.3% and then coarsening with the increasing of Ti. Further, the mechanism of grain refiner is explained from three aspects. Finally, the hardness of A356 alloy is studied to verify the effect of different contents of Ti. The results confirm that the variety of hardness is in accordance with that of microstructure.
Fractal Characteristics of Primary Phase Morphology in Semisolid A356 Alloy
Authors: Liu Zheng , Liu Xiao Mei
Published: June 2012

Semisolid A356 alloy was prepared by low superheat pouring and slightly electro- magnetic stirring(LSPSES). The fractal dimensions of primary phase morphology in semisolid A356 alloy were researched by the calculating program written to calculate the fractal dimensions of box-counting in the image of primary phase morphology in semisolid A356 alloy. The results indicated that the primary phase morphology in the alloy was characterized by fractal dimension, and the morphology obtained by the different processing parameters had the different fractal dimension. The morphology at the different position of ingot had the different fractal dimensions, which reflected the effect of solidified conditions at different position in the same ingot on the morphology in the alloy. Solidification of the alloy was a course of change in fractal dimension.
The Non-Isothermal Crystallization Kinetics of Dispersible Nano-SiO2/PA66 Composites
Authors: Jia Lei , Guo Li Ping , Xu Xiang Min
Published: June 2012

The PA66-based composites containing dispersible nano-SiO2 (DNS) were prepared in a twin-screw extruder by melt compounding. The microstructures of dispersible nano-SiO2/PA66 composites were investigated by means of TEM and XRD, and the non-isothermal crystallization behavior was studied through Jeziorny method and Mo method based on DSC analysis. The results showed that the dispersion of DNS was uniform in PA66 matrix, which could be related to surface structure of dispersible nano-SiO2. It was found from the study of the non-isothermal crystallization kinetics that dispersible nano-SiO2 possessed a heterogeneous nucleation capability in PA66 matrix, and its addition could hinder the motion of PA66 molecular chain, lower the crystallization temperature, and prolong the crystallization time of PA66. In addition, the activation energies for non-isothermal crystallization of neat PA66 and composites were also evaluated by the Kissinger method. The result showed that the activation energies of dispersible nano-SiO2/PA66 composites were higher than that of neat PA66.
The Effect of Cold-Drawing on Recovery Stress of Ni-Ti-Nb Shape Memory Alloy
Authors: Wang Er Min , Hong Qi Hu , Ni Zhi Ming , Han Jin
Published: June 2012

In this paper, self-made tension machine was used to explore the evolution of recovery stress in cold drawing for NiTiNb alloy. The microstructure evolution in different cold drawing conditions was observed. The results show that due to the pre-strain temperature (213K) higher than Ms, the peak values of recovery stress are relatively poor (lower than 490MPa) after cold drawing. After hot drawing, the original spherical Nb particles were changed to thin piece of nano lines and the contribution of Nb nano lines (BCC structure) in NiTi matrix (B2) was greatly improved.
Influence of Gd Addition on the Structure and Capability of Ni-Mn-In Metamagnetic Shape Memory Alloys
Authors: Bai Li Na , Zheng Gui Xing , Duan Zhi Jian , Zhang Jian Jun
Published: June 2012

The influences of Gd concentration on martensitic transformation and magnetic properties of NiMnIn alloys were investigated by differential scanning calorimetry (DSC) , vibrating sample magnetometry (VSM), X-ray diffraction (XRD) and etc. It is Observed through the experiment: the addition of Gd enhances martensite transition temperature;X-ray diffraction analysis of experimental alloys is revealed that to the mixture is martensite and austenite at room temperature; content of Gd is not proportional to the improvement of magnetic property.
Effects on the as-Cast Structure of 7075 Aluminum Alloy by Treating with Electrical Pulse Inoculation
Authors: Sun Zhong Yuan , Liang Yu , Yu Ling Feng , Shi Zhi Yi
Published: June 2012

This paper investigates the influence of electrical pulses inoculation and Al-5Ti-B on the as-cast structure of 7075 aluminum alloy. The experimental results indicate that the number of the secondary branch crystal of the solidification structure is effectively controlled, and the feature of as-cast structure achieve the equiaxial and spherical grains after the liquid 7075 Al-alloy was treated by electrical impulse inoculation and Al-5Ti-B. Compared with these samples treating without electrical impulse inoculation, the segregation of Cu and Fe is restrained to a certain extent too. Some primary refinement mechanisms analyze those effects on the solidification structure by treating with electric pulse and Al-5Ti-B; this experiment may provide a theoretical reference for the application of electric impulse in 7075 aluminum alloy.
Adjusting Microstructure and Magnetic Properties of Ni-Mn-In Metamagnetic Shape Memory Alloys by Addition of Gd
Authors: Bai Li Na , Zheng Gui Xing , Xin Jing , Zhang Jian Jun
Published: June 2012

The influences of Gd concentration on martensitic transformation and magnetic properties of NiMnIn alloys were investigated by differential scanning calorimetry (DSC) , vibrating sample magnetometry (VSM), X-ray diffraction (XRD) and etc. It shows that addition of Gd enhances martensite transition temperature and that X-ray diffraction analysis of experimental alloys is revealed which the mixture is martensite and austenite at room temperature. These alloys show promise as a metamagnetic shape memory alloy with magnetic-field-induced shape memory effect.
Some Studies on Preparation of Large Spray Deposited Aluminium Alloy Tube Preform
Authors: Chen Zhi Gang , Liu Hou Cai , Liu Wen Hui , Wang Zhen Sheng , Chen Zhen Hua
Published: June 2012

In this paper, preparation of large spray deposited aluminum alloy tube was investigated. The shape and particle size distribution of over-sprayed powders together with structure of deposits were analyzed. The results show that the over-sprayed powders resulted from particles missing, spurting and rebounding. The particle size distribution was non-standard normal distribution, the particle size of the great majority was within 150μm and the average size was 50μm. The residual pores in deposits came into being when inter-particle space could not be filled with enough liquid during spray deposition. The as-deposited preform with rough surface was a coalesced bulk of deposited particles. The rotate speed of substrate and scan speed of atomizer together with spray stripe width should satisfy any certain relationship to obtain a qualified tube preform. Substrate preheating and surface treatment and residual stress control were very important for preparing a large preform.
Study on Present Situation and New Trends of the Electrodeposition of Nickel-Cobalt Alloy
Authors: Yu Ming Ming , Li Hong You , Wang Yi
Published: June 2012

Nickel-cobalt alloys have broad application prospect for their excellent properties (i.e. high microhardness, strength, abrasion, corrosion resistance and magnetic properties.etc). Present situation and new trends on mechanism of the anomalous codeposition and technology of electrodepostion of nickel-cobalt were studied. Effects of electrolysis parameters (e.g. concentration of co2+in the electrolyte, cathodic current density, pH value, temperature.etc) on the alloy composition, morphology and mechanical properties were analyzed. The formation of the monovalent intermediate (hydroxides or colloid) may cause the cobalt preferential deposition or the faster charge-transfer of Co2+ reduction compared to that of Ni2+ reduction is the main factor that causes the anomalous codeposition behavior of the nickel-cobalt alloy.
Thermal Flow Deformation Behavior and Mechanism of As-Cast and As-Extruded Burn Resistant Titanium Alloy
Authors: Sun Huan Ying , Cao Jing Xia , Wang Bao , Huang Xu , Cao Chun Xiao
Published: June 2012

Hot compressive deformation tests of burn resistant titanium alloy (Ti-35V-15Cr-Si-C) with initially as-cast and as-extruded microstructure were performed at deformation temperature between 900°C to 1200°C for as-cast and 900°C to 1150°C for as-extruded alloy, and strain rates between 10-3 s-1 to 1s-1. The compressive true stress vs. true strain curves were measured, the deformation activation energy was calculated and the microstructures after deformation were studied. The results show that dynamic reversion is the primary soften mechanism of the burn resistant titanium alloy during hot deformation. At the higher strain rate ( =1s-1), the ‘Necklace’ Dynamic Recrystallization will occur for as-cast alloy, and a Continuous Recrystallization will occur for as-extruded alloy. At the lower strain rates, both as-cast and as-extruded burn resistant titanium alloy display the continuous recrystallization. The extruded alloy presents larger dynamic recrystallization regions than that of the as-cast alloy.
Experimental Study on the Mineral Processing of a Certain Low Grade Copper-Molybdenum Ore in Xinjiang
Authors: Jia Qing Mei , Zhang Li Min , Lv Wen Zhi
Published: June 2012

Copper molybdenum ore, Experiment study, Copper molybdenum separation, Flotation. Abstract. Aimed at the ore characteristics，the flotation flowsheet of one—stage coarse grinding—bulk flotation of copper and molybdenum—regrinding of bulk concentrate—separation of copper and molybdenum was determined effected．Experiment uses the above flowsheet and reasonable conditions to process molybdenum crude ore of molybdenum and copper crude grade being 0.066% and 0.03%,and the better indexes of the molybdenum grade of concentrate is 51.68%,the copper grade of concentrate is 12.60% and molybdenum recovery is 74.33% are got.
Influence of Titanium Alloying Element Substrata on Bacterial Adhesion
Authors: Mediaswanti Kun , Truong Vi Khanh , Hasan Jafar , Ivanova Elena P. , Malherbe Francois , Berndt Christopher C. , Wen Cui'e , Wang James
Published: June 2012

Titanium and titanium alloys have been widely employed in many load-bearing orthopaedic applications due to their excellent strength and corrosion resistance. However, postimplantation infections might occur even though considerable studies have been made. Choosing a bio-friendly alloying element is one way to reduce infection risk. The aim of this study is to evaluate the extent of bacterial attachment on titanium, tantalum, niobium and tin surfaces. Two pathogenic bacterial strains, namely Staphylococcus aureus CIP 65.8T and Pseudomonas aeruginosa ATCC 9027, were used in this study. Quantification of bacterial attachment was performed using scanning electron microscopy. Results indicated that the surface chemistry and topography of the investigated materials significantly influence the degree of P. aeruginosa and S. aureus adhesion; however, surface wettability did not show a significant impact upon bacterial retention. In this study, tin was shown to be the most attractive material for bacteria adhesion but tantalum limits the bacterial adhesion. Therefore, it is suggested to limit the amount of tin as an titanium alloying element due to its nature to attract P. aeruginosa and S. aureus adhesion.
Study on Dynamics Model of Macro/Micro Mechanical Arm of the New Workover
Authors: Wang Yan , Chang Yu Lian , Gao Sheng , Wang Jing
Published: June 2012

Macro/micro mechanical arm is an important component of workover mechanical system. According to its composition characteristics and working principle, the arm was simplified to a plane system that all components were working in the same plane. Based on rigid body kinematics and dynamics theories, the kinematics and dynamics mathematical models of arm lifting progress were established by using constraint equations, rate equation, acceleration equations, virtual principle work, lagrange multiplier and differential-algebraic mixed equations of motion. It provides theoretical basis for kinematics and dynamics analysis of the macro/micro mechanical arm in lifting process.
Annealing Effects on W-Doped VO2 Thin Films Prepared from Magnetron Sputtering
Authors: Chen Shuang , Dong Cui Zhi , Zhang Li Fang , Yu Zhi Ming
Published: June 2012

W-doped VO2 thin films were prepared by magnetron sputtering after annealing in vacuum. The structure, morphology, infrared transmittance and phase transition were characterized by X-ray diffractometer, atomic force microscopy(AFM), infrared spectrometer (IR) and differential thermal analysis(DTA), respectively. The results show that after vacuum annealing at 500 °C for 2h, the major phase of W doped films is VO2. Dopant reduce the phase transition temperature of VO2 thin films to 21.9°C.
Study on Estimate Model of Linear Objects’ Fractal Dimension
Authors: Li Bin , Xu Yong Long , Xu Ming Xia , Li Shi Hang
Published: June 2012

This paper, based on the concept and definition of fractal dimension, discussed the properties of the linear objects’ fractal dimension estimate model, and established its sufficient and necessary conditions of linear objects’ fractal, and put forward a kind of linear objects’ fractal estimate model, and verified the rationality and validity of the model for linear objects’ fractal calculation.
The PC Main Board Static Stress Analysis Using ABAQUS
Authors: Chen Xu Qin , Zheng Yu Qing
Published: June 2012

This article took the PC main board as a research object and simulated how to optimize the position of the desktop main board pads. The static stress analysis was executed using ABAQ -US/Standard. The objective was to reduce the local deformation of computer main board occurs when the connector was inserted and extracted during the assembly process, preventing the chips and capacitances on the main board from becoming invalid. The simulation results showed that the FEA method with Abaqus can be used to predict the main board performance and structure optimization.
A New Numerical Simulation System for a Flexible Beam with Imbedded Fluid
Authors: Ma Ning , Xu Hui , Wang Jian Wei
Published: June 2012

A new numerical simulation system of a flexible Euler beam with imbedded fluid subsystem, an expansive FLUENT UDF computing system, has been proposed and investigated in this paper. The results of numerical simulation basically matched the experiment. The shape of fluid free surface, the pressure field and the velocity field of the field commendably opened out the movement law of fluid in cavum and the characteristic of fluid-beam interworking, and explain the interior principle and validity of reducing vibration of the Interior Inlay Viscous Fluid Unit (IVFU) towards the flexible beam.
Algorithm and Application of Springback Modification for Complex Bending Parts
Authors: He Er Ming , Zhang Hong Wei , Zhao Zhi Bin
Published: June 2012

To solve the problems of complex bending parts forming, such as low efficiency and accuracy, and loss of modification experience data, the algorithm of three parameters segment springback modification (TPSSM) based on arc approximation is presented in this paper. Firstly, the centroid line is divided into several arc sections according to the requirement and each section is modified based on presumptive correcting factor of radius, torsion and torsion angle. Then based on UG re-development, the program and UI of TPSSM are developed with UG/Open API and MFC. Finally, experimental results show that this method can effectively realize springback modification of bending parts, which is worthy for practical engineering project.
A Rapid Inverse Method of Material Performance Parameters in Sheet Metal Forming
Authors: Liu Hua , Jiang Kai Yong , Liu Bin , Lu Ping
Published: June 2012

This paper proposes a fast and convenient method to inverse the material performance parameters in stamping forming. This method effectively combined with the FEM and the genetic algorithm. The reverse objective function was constructed with the thickness which is easily measured from the stamped parts, and then a genetic algorithm was programmed; The thickness-sensitive material performance parameters can be acquired through the orthogonal experiment, then these material parameters can be inversed by the self-programming genetic algorithm. Finally, a stamping case proves this method is precise, rapid and valid.
Optimization of Initial Blank Shape to Minimize Defects in an A Pillar Inner Panel Using Finite Element Method
Authors: Li L.M.
Published: June 2012

Wrinkling and cracking are two major problems of the automobile inner panel. In this study, the stamping process of an A pillar inner panel is studied with the finite element (FE) method, aimed at avoiding drawbacks due to wrinkling and cracking. The established numerical model is proved accurate by comparing the numerical final configuration to the real part. Then the material flow of the blank is analyzed. It is concluded that blocking of material flow is the main reason for those two pathologies. Thus, a gap design is suggested to minimize the concerned defects. According to the numerical results, after optimizing, the inner panel is free from formability problems.
Effect of the Multi-Electromagnetic Fields on the Solidification Process of the Continuous Casting Hollow Billet
Authors: Zhang Qi , Wang Jin , Chu Zhong
Published: June 2012

In order to optimize the process parameters of continuous casting hollow billet with multi-electromagnetic fields, the solidification process of the continuous casting hollow billet was studied by the numerical simulation method, the results show that: 1) when only solenoid coil is imposed on outside of the outer-mold, it generates a lot of joule heat near the outer-side surface of hollow billet and leads to the uneven thickness of the solidified shell which is easily cause the crack defect. 2) when only traveling stirring electromagnetic field is imposed in the inside of the inner-mold, it can homogenize the temperature distribution of the molten metal and decrease the sump height, but it can also result in the uneven thickness of the solidified shell because of the nonuniform flow of molten metal. 3) when the above two kinds of electromagnetic field are applied simultaneously, the multi-electromagnetic fields can improve the homogeneous thickness of the solidified shell and decrease the sump height which is better for the high casting velocity and hollow billet quality.
Research on Fuzzy-PID Compound Control in Inverter-Driven Energy-Saving Technology for Injection Molding Machine
Authors: Feng Gang , Qi Ji Bao , Zhang Chao Ge , Zhang Ya
Published: June 2012

the modern Inverter-driven technology has been applied in energy-saving control for injection molding machine. Aimming at the complex control of system because of its multiple input multiple output, strongly nonlinearity, some volatility parameters and uncertainty factor , the adaptive fuzzy PID compound control is put forward from the viewpoint of energy-conditioning. Using the above method, the control system have better dynamic characteristics and stability, strong robustness and adaptability. Experiment results show that the method can effectively improve energy-saving technology for the injection molding machine.
Mechanical Analysis of Warm Extrusion Precision Forming on 42CrMo Steel Cutting Pick
Authors: Su Chun Jian , Li Quan Lan , Xiao Lin Jing , Guo Su Min
Published: June 2012

Cutting pick is a kind of widely-used consumptive mining tool. The traditional producing technics of cutting pick body is foundry, or machining after roughly forging, or machining directly from metal bar. By former technics, the property of products is poor, and by latter, the material availability is low and the cost is high. The patent technology for cutting pick body warm extrusion introduced in this paper can overcome all the disadvantages mentioned above. In this paper, by analyzing the characteristic of cutting pick body warm extrusion, adopting the principle of power balance to solve the approximate solution of strain forces, the approximate calculating formulas of extruding power are deduced. The main factors affecting on extrusion force are determined theoretically. This research can be used as basis to design tooling and choose proper equipment for this new technology.
Influence of the Blooming Processes of Heavy Forgings on the Forgings Quality
Authors: Liu Guo Hui , Zhuang Zheng , Liu Peng , Ni Li Yong , Zhu Shi Yong , Chen Jia Jia , Lin Hou Chao , Liu Long Hua
Published: June 2012

Forgings quality depends on the blooming processes and the deforming processes. The blooming processes are composed of upsetting and stretching, both of which influence the forgings quality very much. However, it is ignored. Methods are put forth to improve the forgings quality. It is surely of much significance.
Mold Flow-Based Mold Flow Analysis of Copier Parts and its Solution Optimization
Authors: Yang Jun Kai , Xu Yun Jie
Published: June 2012

Mold flow software is used to conduct mold flow analysis of copier parts, simulate its filling and cooling process, and predict possible defects in the product design process in order to determine the formability of plastic parts and product quality. The optimal mold structure can be obtained by comparing different solutions so as to save production costs and improve product quality and efficiency.
Three-Dimensional Numerical Simulation of Molten Steel Flow Behavior in Soft-Contact Electromagnetic Continuous Casting Mold
Authors: Wang Xing Juan , Zhu Li Guang , Liu Ran , Li Zhi Hao , Tian Peng
Published: June 2012

Using finite element method, the molten steel flow process in soft-contact electromagnetic continuous casting mold is simulated. The results show that the molten steel surface were affected by the electromagnetic force and shrink to the centre, near meniscus zone the flow velocity of steel increases and appears an obvious circumfluence, a large number of inclusion float and are absorbed by flux; on the other hand, the turbulent kinetic energy significant increases in circumfluence area, this exacerbates the reaction between flux and liquid steel, the initial size of the solidification organization are refined, and the surface quality of slab are enhanced.
Quiescent Pouring Process of Vacuum Sealed Molding Casting
Authors: Li Guo Hui , Lin Hong Qi , Yang Yang
Published: June 2012

The silicon aluminum alloy casting with the large, thin wall and high surface quality requirements is produced with the inversion pouring process of vacuum sealed molding casting. The quartz sand was dried by 30 (0.425, 0.300, 0.212 screen) groups water, and the plastic film was dried to soft at 60 ~ l00 °C and the vibration frequency of the vibration worktable was 50 Hz, and the amplitude was 0.5~1mm,and the vacuum degree was 0.040 ~ 0.075 MPa. The inversion pouring was driven by Hydraulic drive with 60 ~ 90 s filling time. The inversion pouring process with smooth gas discharge, reasonable temperature distribution and good shape of casting thin wall, which improves the liquid metal liquidity, the mechanical properties and surface quality, and meets the using requirement.
Warm Compacting Behaviors and Sintering Performance of 316L Stainless Steel Powder
Authors: Ke Mei Yuan
Published: June 2012

Warm compacting behavior and sintering performance of 316L stainless steel powders were studied. Results showed that green density and strength of samples made in warm compaction were much higher than that in cold compaction. Under pressure of 700MPa, green density and strength in warm compaction were 7.01 g•cm-3 and 30.7MPa, which were higher than cold compaction by 0.19 g•cm-3 and 10.7MPa. When sintered in hydrogen-nitrogen atmosphere for 60 minutes, sintered density, tensile strength and elongation all increased with the rise of sintering temperature. At 1300°C, Sintered density, tensile strength and elongation were 7.42 g•cm-3, 545MPa, 28.0%, respectively.
Simulation of Ion Distribution on both Sides of Insulation Film in Saltwater under Static Electric Field
Authors: Gu Liang
Published: June 2012

The world is facing a severe crisis of fresh water shortage. Seawater desalination technology is an ideal answer to this crisis. However, the conventional desalination technologies consume too much energy. New desalination methods are required to reduce the energy consumption. This paper proposes an idea for saltwater desalination based on the ions of contrary sign which attract each other on both sides of a thin insulation film in a high-voltage static electric field. In an insulation pipeline with saltwater, a piece of thin insulation film is installed vertically to the electric field. The positive ions were pumped onto the positive side of the film while the negative ions were pumped onto the negative side of it. Both ions accumulate at both sides of the film at the aid of electric field. The thinner is the insulation film, the stronger of the attractive force between positive and negative ions at opposite sides of the film and the higher the ion concentration on both sides of it. First, a model based on this idea was introduced. Then, four factors were simulated to reveal their effects on the ion distribution characteristics, including the salt concentration, the length of the pipeline, the electric field intensity, and the film thickness. The simulation results show that the desalination idea is practice to eliminate the dissolved ions in salt water and produce fresh water if the insulation film is thin enough and the electric field intensity is strong enough. The electric field only exerts electric force onto not the majority of water molecular but the minority of ions, so this method consumes much less energy than the conventional desalination methods.
CAE-Based Injection Molding Analysis of Mobile Phone Battery Cover
Authors: Yang Jun Kai , Xu Yun Jie
Published: June 2012

In this thesis, CAE software is used to carry out the injection molding analysis of mobile phone battery cover and simulate the filling and cooling process so as to determine the formability of plastic parts and product quality. In the process of product design, it can also predict possible defects so as to optimize mold structure, save production costs, and improve quality and efficiency of cell phone battery cover design.
Effect of Vanadium-Nitrogen Concentration and Cooling Rate on Grain Refinement in V-N Steel
Authors: Shi Xiao Fang , Chang Li Zhong , Jiang Chun Feng , Liang Lin Bao
Published: June 2012

Effect of vanadium and nitrogen concentration in V-N steel and cooling rate after deformation on grain refinement has studied in this paper. The results show that with the increase of vanadium and nitrogen concentration, ferrite grain size is smaller compared with carbon steel; with the increase of cooling rate after deformation, ferrite grain size is finer and pearlite content of microstructure significantly is reduced too. Compared with the Nb-bearing steel, as long as selecting reasonable the process parameters and adding the appropriate vanadium, nitrogen to the steel, V-N steel can also get a good strength and toughness, and the cost is lower than Nb-bearing steel. This method of producing the steel with good Strength and toughness is very suitable to China who possesses the abundant vanadium resource, but is lack of niobium.
Theory Study and Numerical Analysis of Ultra-Thin Wall Injection Molding
Authors: Yin Su Feng , Ruan Feng , Wang Jian Yu
Published: June 2012

The article focuses on the discussion of size relationship of melt viscosity of ultra-thin wall injection molding, revising the viscosity model of traditional stimulant Cross-WLF. It takes the theory of Uhland wall-slip, trying to analyze the influence which the wall-slip of the molding makes on injection molding. It also points out the limitation of constant heat transfer coefficient in the molding. The change rules of the heat transfer coefficient is among the study. Using the method of numerical simulation and experience, the article verifies the consistency of experience result and the change of the factors, such as using ultra-thin viscosity model, wall-slip and the change of heat transfer coefficient while doing the simulation.
A Study on the Cost Estimation of Mould Manufacturing Processes for Cosmetic Cap
Authors: Park Sang Bong
Published: June 2012

It has conducted a study on the cost calculation of spray component mould manufacturing process. In general, it is the present state that calculating machining time and cost for a unit process in mould manufacturing process depends on past experiences. In other words, it does not go beyond the level of computing and management by estimation based on the data conducted in the past. Accordingly, in the development of mould and new products tried for the first time, the cost calculation is not reasonable and thus a lot of time is needed. That is to say, not being able to actively and reasonably respond to the needs of the market that are changing every moment, the loss of management and money due to losing opportunities is frequently taking place. In this context, It have developed and applied a system that can reasonably calculate the cost by taking account of machining time calculation theory, machine, tool, material and working environment. As a result, calculating the time needed for a unit process in mould manufacturing process is possible, and it is possible to classify major processes and suggest alternatives in management. The system developed in this study used Visual Basic Language and SQL Database under Windows environment.
Theoretical Analysis of the Displacement on the End-Section of the Rolled Parts for Multi-Wedge Cross Wedge Rolling
Authors: Yuan Wen Sheng , Wang Zhong Lei , Shi B.J. , Cheng Gang
Published: June 2012

Multi-wedge Cross Wedge Rolling (MCWR) is an advanced technology in forming long axial parts, and it does not have the disadvantages of Single-wedge Cross Wedge Rolling (SCWR).However, it is extremely important to realize the regularity of the displacement on the end-section of the rolled parts in MCWR due to the complexity of its forming mechanism. In this paper, based on the method of the displacement on the end-section of the rolled parts in SCWR, the rules of the displacement on the end-section of a typical rolled part in MCWR were investigated theoretically, and the curve on the end -section of the rolled part in MCWR were analyzed.Based on the curve, the regularity of metal flowing and the characteristic of forming for the typical rolled part in each phase by MCWR were analyzed. It is of high value in studying the forming mechanism and designing mould and technics in MCWR.