bluuebunny/crossref_metadata_2025 huggingface dataset:
MEMS Tri-Axial Tactile Sensor for Sensorized Guide Wire in Catheterization Application
Authors: Cheng Ming Yuan , Tan Ee Lim , Lim Rui Qi , Tan Kwan Ling , Ng Simon Sheung Yan , Chue Colin Jian Rong , Hamidullah Muhammad , Yee Tack Boon , He Cai Ran
Published: March 2013

This paper describes the integration of micro-electro-mechanical systems (MEMS) tri-axial force sensor using polyimide-based substrate for sensorised guide wire application. For tri-axial force sensor, piezoresistive silicon nanowires (SiNWs) are embedded into a cross cantilever design with a maneuverable stylus to allow the detection of force in all directions, and amplify the tactile forces at the tip for transverse directions. The electrical resistance changes in the four SiNWs are used to decode an arbitrary force applied onto the force sensor. Robustness of the force sensor is improved due to the novel design by incorporating a mechanical stopper at the tip of the stylus. Flip chip bonding using gold stud bumps is used to mount the force sensor on a substrate for characterization and to simplify the assembly process. The packaging process of the miniaturized sensorised guide wire was presented in this work.
Preparation of TiC Hard Metal by Presssureless Infiltration Method
Authors: Lin Tao , Shi Yong Liang , Shao Hui Ping
Published: March 2013

The steel matrix composites pressureless infiltration technology was studied in this paper. It is necessary to develop a reasonable process, select the appropriate gel system and additives, and prepare the complex shape of the large-size steel matrix composites by using gel-casting. For reactive melt infiltration technique, the porous skeleton was prepared by gelcasting preparation of the titanium powder and ceramic particles mixed, and the C-containing liquid metal infiltration of the porous skeleton. To improve the wettability between the molten metal and the ceramic phase, it is used for the process Ti-C in situ reaction to accelerate the impregnation process. Finally, the steel matrix composites with higher density were prepared.
Effects of Ce, Mn, Cr on the Microstructure and Properties of High-Iron Eutectic Al-Si Piston Alloy
Authors: Hu Ping , Su Yong , Chen Wen Ping , Jiang Yan
Published: March 2013

The paper discussed the effects of Ce, Mn, Cr on the microstructure and properties of high-iron eutectic Al-Si piston alloy using orthogonal design. It has been found that Mn and Cr improved the morphology of β phase (Al9FeSi3), becoming the Fe phase that consists of Mn and Cr; Rare earths Ce has a strong effect on refinement of the eutectic silicon. At a high mass fraction of Ce, Ce enter Fe phase that contains Mn and Ce, which improves its morphology greatly and decreases the size of Fe phase, and is able to replace the position of Ni, becoming high-temperature Al-Ni-Cu-Ce phase. The best additions of Ce, Fe, Mn, Cr would be 0.8%, 1.0%, 0.4% and 0.1% respectively and the tensile strength under room temperature (25°C) and high temperature(300°C) would reach 270.3MPa and 136.7MPa respectively, which fully meet the requirements of the use of novel the piston high temperature load.
Effects of the Aging Time and Temperature on the Microstructures and Mechanical Properties of 6082 Aluminum Alloy Extrusions
Authors: Wu Tao , Ding Xian Fei , Sun Jing , Zhang Wei Dong , Sun Dong Bai , Wang Li Chen
Published: March 2013

The main task of this work was to study the effects of aging time and aging temperature on the microstructure and mechanical properties of 6082 aluminum alloy extrusions. Artificial aging was performed on the alloy extrusions at the temperatures of 150, 175 and 200 °C for the aging times of 4, 8 and 12 h. The microstructure evolution of the aluminum alloy extrusions with increase of the aging time and temperature was investigated by Field Emission Scanning Electron Microscope (FESEM). For the purpose of how the aging process affected the mechanical properties, tensile tests were performed. The results showed that the optimum aging treatment was 175 °C/4 h. Under this condition, the tensile strength (Rm) and the yield strength (Rp) in the longitudinal direction of the extrusions reached the maximum value more than 350MPa and 320MPa, respectively, and the tensile elongation (A) was more than 15%.
Influence of Gd Content on the Microstructure and Mechanical Properties of Zn-Al-Mg-Si Alloy
Authors: Wei Ai Li , Liu Xing Hai , Zhang Kun Yu , Liang Wei
Published: March 2013

The microstructure and mechanical properties of the as-cast Zn-25Al-5Mg-2.5Si-xGd alloys at room and elevated temperature have been investigated in this work. The results show that the addition of element Gd leads to the grain refining and the formation of Al3Gd phase and GdZn12 phase in the microstructure, and the mechanical properties of the alloys rise at first and then drop with the Gd content increasing. When Gd content is 0.8wt.%, the optimization of microstructure and mechanical properties is obtained. The alloy can be increased by 13.9%, 37.7% and 45.6% in tensile strength and be increased by 13.4%, 76.9% and 78.2% in hardness at room temperature, 100°C and 180°C, respectively.
Effect of Si Content on Deformation Behavior of DC Cast Al-Si Alloys
Authors: Wang Chun Xia , Yu Fu Xiao , Zhao Da Zhi , Zhao Xiang , Zuo Liang
Published: March 2013

The deformation behavior of DC cast Al-2Si and Al-15Si alloys have been studied by means of compression test at temperature range of 300-500°C and strain rate range of 0.01-5 s-1. The results show that the flow stress of the Al-Si alloys increases with decreasing compression temperature and increasing strain rate. The flow curves determined from the compression tests exhibit that the deformation of the materials is controlled by two competing mechanisms: strain hardening and flow softening. Higher silicon content in the alloys also leads to higher flow stress during deformation and tend to show more significant flow softening. Particle damage during the deformation may have an influence on the flow curves of the alloys.
Microstructure Evolution of Al-Ti-C Alloy Wires during Remelting Process
Authors: Ding Wan Wu , Zhu Jiang Tao , Zhao Wen Jun , Xia Tian Dong
Published: March 2013

The regular pattern of evolution of TiC and TiAl3 during the remelting process of Al-Ti-C alloy wires was analyzed and the impact mechanism was discussed. The results show that: when the temperature of the remelting mass is at 730°C, with the increase of the heat preservation time of remelting, the degree of agglomeration of the original dispersed TiC will increase, and they are pushed toward crystal boundaries by α-Al during the solidification process, while TiAl3 will dissolve, aggregate, and grow. When the remelting temperature is at 1000°C, as the heat preservation time increases, not only the agglomeration degree of TiC increases significantly compared to that at 730 °C and the sizes and shapes of TiAl3 change significantly as well. The morphology of TiAl3 will change from being lump-and-short-rod-like to needle-and-flake-like. Before and after remelting, the Al-Ti-C alloys are both composed of TiAl3 and TiC, with no other phases formed.
Influence Research on the Pretreatment of Recycled Coarse Aggregate to the Strength of Recycled Concrete
Authors: Gao Lin , Shi Yan , Xu Guo Qiang , Cao Lei
Published: March 2013

Large amounts of waste clay brick generated in the city expansion process, which formed serious harm on the city environment, and resulted in the waste to the aggregate resources. The waste clay brick was processed the recycled aggregate, which can be used for preparing the recycled concrete. The pretreatment method to recycled aggregate have certain influence on the compressive strength of recycled concrete, through the experiment, we can get that different pretreatment methods can improve accordingly the compressive strength of recycled concrete, and has certain reference significance to the reuse of recycled aggregate.
Influence of Aspect Ratio of Macro Synthetic Fiber on Mechanical Properties of Shotcrete
Authors: Su An Shuang , Cai Yue Bo
Published: March 2013

Influences of moisture content and loading rate on flexural toughness were experimentally studied for fiber reinforced shotcrete (FRSC) with steel fiber or macro synthetic polypropylene fiber. According to the four-point bending test method specified in ASTM C1609 and Chinese standard CECS 13, the flexural toughness of specimens after drying for 0h, 16h, 24h and 72h in condition of (20±2)°C and (60±5)% relative humidity was tested at a loading rate of 0.05 mm/min. For specimens after drying for 24h and 72h, flexural toughness was tested at loading rates of 0.05 mm/min, 0.10 mm/min, and 0.20 mm/min respectively. With the moisture content decreasing, the flexural toughness T100,2.0, first-peak flexural strength, and residual flexural strength at prescribed deflections of FRSC exhibited decreasing tendency. The specimens with 0.5 vol% of steel fiber showed higher T100,2.0 value than that with 0.9 vol% of macro synthetic fiber. The residual strength and flexural toughness of FRSC increased with the increase of loading rate.
Tricalcium Silicate (C3S) Properties in Different Physical and Chemical Environment
Authors: Wang Lai Guo , Huang Wei , Wang Jun Wei
Published: March 2013

The paper study on the properties of Tricalcium Silicate (C3S) in different physical and chemical environment, the results suggest that neither chemically nor by way of adsorption and that the physically bound water could not act as a solvent for the ethanolamine. Small-angle neutron scattering studies allow a nondestructive description of statistically representative microstructures in the scale range from micrometer to nanometer. Moreover, the scattering signals can be analyzed in a variety of ways, and more detailed insight can be provided into the very complex cement paste microstructure.
The Experiment Research of a New Cementing Material Applied in Iron Tailing Filling
Authors: Li Fu Ping , Gu Yan , Nan Shi Qing , Feng Jie
Published: March 2013

Previous studies found that there were some problems when processing goaf by filling method, such as large amount of cement, and high cost. A new type of cementing material was investigated in this study. Its main ingredients was graining blast furnace slag. on the chemical activation, its activities were substantially improved, and the technical parameters of the filling body were markedly ameliorated. Furthermore, the new cementing material complied with the filling cementing material standard of China. The results demonstrated that the new type of cementing material which overcome some traditional shortconmings could be the pottential material for the similar mines which exploit ores by back-filling method.
Experiment Study and Numerical Simulation of CFRP Sandwich Structure on Aircraft Ditching Model
Authors: Yan Shi Lin , Yan Fei , Feng Zhong Jiang
Published: March 2013

This paper do the research of molding process, experimental study, numerical simulation for carbon fiber reinforced polymer (CFRP) sandwich structure under an aircraft ditching model. The model is simultaneous restricted to the weight and strength requirements. Choosing three types of expandable polystyrene (EPS) foam, testing their properties in different kinds of conditions: density, thickness of the core, layer. By the experiment to verify the design, we can gain the optimized layer, thickness of the core and parameters. This project can provide the basis to the design of manufacturing, process parameters and weight control for CFRP sandwich structure on aircraft ditching model.
Reliability Analysis of Wear Casing Internal Pressure Strength
Authors: Zhang Xian Yong , Feng Jin
Published: March 2013

Reliability of eccentric wear casing was studied by Monte-Carlo and finite element method. In different internal pressures, calculated reliability of P110 steel grade 9 5/8 inches casing with wear depth less than 0.5 times wall thickness. The influence of different cement ring circumferential missing amount and stratum pressures on wear casing reliability were presented. The results provide basis for casing safety evaluation and reasonable replacement.
Crevice Corrosion Behaviors of X52 Carbon Steel in Chloride Containing Solutions
Authors: Hu Qian , Liu Jing , Zhang Jie , Huang Feng , Guo Xing Peng
Published: March 2013

The crevice corrosion behaviors of X52 carbon steel in two typical Cl--containing solutions were investigated by electrochemical noise and electrochemical impedance spectroscopy. Results show that oxygen concentration difference leads to the coupled current in NaCl + NaHCO3 solution while HAc concentration difference causes the coupled current in NaCl solution saturated with CO2 in the presence of HAc. There exists an apparent incubation stage during the crevice corrosion process of X52 carbon steel in the former. However, no obvious incubation period of crevice corrosion can be observed in the latter. Micrography shows that the crevice corrosion occurs indeed and the corrosion inside the crevice is not uniform.
3D Generalized Beam (GB) Lattice Model for Analysis of the Failure of Concrete
Authors: Wang Han , Zhao Ming Hao , Gao Ji , Wang Guang Yuan
Published: March 2013

Concrete is usually described as a three-phase material, where matrix, aggregate and interface zones are distinguished. The beam lattice model has been applied widely by many investigators to simulate fracture processes in concrete. Due to the extremely large computational effort, however, the beam lattice model faces practical difficulties. Moreover, real fracture processes are 3D and not 2D. In our investigation, a new 3D lattice called generalized beam (GB) lattice is developed to reduce computational effort. Numerical results obtained by the model are in agreement to what are observed in tests. The 3D effects of the particle content on the peak load and ductility are discussed as well as the 3D fracturing phenomenon.
Fatigue Life Prediction of Welded Case Shell on Aeroengine under Combined Internal Pressure and Axial Loads
Authors: Duan Xiao Xue , Zhang Yan Hua
Published: March 2013

Stress and fatigue analysis of welded case shell on aeroengine under combined internal pressure and axial loads using elastic-plastic finite element has been performed. The results show that the largest stress concentration appears on the mutational cross section of the fixture seat and fixture fringe structure some distance from the weld toe. The positions with the weakest fatigue life locate at the fixture fringe close to the weld toe of girth joint, and also appear at the ring closed weld of the case shell middle.
Diameter-Controlled Synthesis of Single-Walled Carbon Nanotubes
Authors: Zhao Ting Kai , Zhao Xing , Yan Jin , Du Li , Li Tie Hu
Published: March 2013

With the technological progress in the synthesis of multi-walled carbon nanotubes and single-walled carbon nanotubes, more attention was attracted to the synthesis of carbon nanotubes with diameter distribution, ideal length, different chirality and certain orientation. In recent decade, all these factors have been investigated and a number of progresses have been made for the application of carbon nanotubes. The latest researches on the growth of diameter-controlled single-walled carbon nanotubes are reviewed and discussed. The existing problems and challenges of the synthesis processes have been addressed in the future directions.
Design and Cut Skills in Accordance with the Physical Properties of the Gem Stones
Authors: Peng Hua Ming , Xia Fei , Zhang Wan Wan
Published: March 2013

This paper discussed how we can do to design gem stones cut in accordance with their physical properties. Thickening or thinning can be used for the colored gemstones to improve their color. Orienting the table facet is necessary for the star gem stones, cat's eye gem stones and tiger's eye gem stones. It is very important for a pleochroic stone to be cut in proper orienting to show off the different colors. It is desirable to choose cabochon for an opaque gemstone and facet for a transparent gemstone. And a well-crafted geometrical arrangement of facets is key technique to maximize the brilliance and fire of the stones, such as diamond. Do with these skills and get your ideal gems.
Effects of Nano Particle Hydroxyapatite on Cadmium Bioaccumulation and Translocation in Pakchoi (Brassia chinensis) from Cadmium Polluted Soil
Authors: Li Zhang Wei , Wu Yun Ying
Published: March 2013

A pot experiment was conducted to investigate the effect of nano particle hydroxyapatite (nHAP) on Cadmium(Cd) contaminated soil. The Cd uptake of pakchoi in Cd polluted soil treated with various concentration of nHAP were studied. In addition, the effect of nHAP on chemical fraction distribution in Cd contaminated soil was evaluated. Results indicated that by adding the nHAP, the Cd level in pakchoi shoots and roots decreased significantly compared to the control. The mechanism of this treatment involved bioavailability reduction and immobilization of Cd in soil, resulting in the transformation of available fractions to unavailable fractions. In conclusion, with the addition of nHAP, the resistance to Cd of pakchoi in contaminated soil could be significantly enhanced and the quality of the plants improved.
Experimental Study of Thermal Plasma Processing Waste Circuit Boards
Authors: Wang Song Bai , Cheng Chang Ming , Lan Wei , Zhang Xian Hui , Liu Dong Ping , Yang Si Ze
Published: March 2013

This study aimed to that waste circuit boards in batches were incinerated by thermal plasma. Firstly, the working principle of plasma incinerator and the exhaust gas treatment main process were introduced, then, the experimental results was analyzed and discussed. Due to the thermal plasma processing waste incineration furnace has high temperature (1200 0C above), all the organic ingredients in waste circuit boards, including dioxin, can be decomposed completely in a few milliseconds, no showing the secondary pollution and no producing furans and other carcinogens. In addition, after main exhaust gas (CO, NO) concentration change with time was carefully tracked, it was found that a large amount of CO gas was produced and NO gas concentration was within national safety limits during experiment. Although 44.4 kg sample was incinerated, more than 1 kg of small pieces of metal like Copper was obtained from the cooling molten slag. Finally, it was obvious that the volume and weight of molten slag was far less than the ones of sample. The experimental result has important practical significance for protecting the environment, obtaining more CO gas resource and retrieving a variety of rare metals (such as Gold, Copper, Silver, Platinum, etc.).
Study of Reed Leaf Fibers’ Degumming in High Temperature and Pressure
Authors: Zhao Hou Jie , Wei Chun Yan , Cui Yong Zhu , Lv Li Hua , Wang Xiao
Published: March 2013

In order to make the reed leaf fiber soft, increase its separating degree and remove impurities, the method of pretreatment in removing impurity was studied. The orthogonal method was used to optimize the treatment condition and the optimal conditions were obtained at a concentration of sodium hydroxide of 18g/L, treating temperature of 100°C and holding time of 90min. It also revealed that temperature holding time had the greatest influence on the degumming effect of the fibers. Under these conditions, the content of pectin and hemicellulose could reach about 2.6% and the content of cellulose could come up to 92.8%. Furthermore, the binary quadratic orthogonal regressive experiment was used to optimize the degumming process. The longitudinal directions of the fibers were examined by SEM before and after the processing.
Photoelectrocatalytic Degradation of HCB by N-Doped TiO2 Nanotube Arrays
Authors: Guan Yu Jiang , Wang Zi Bo , Bai Shu Li , Xue Qin
Published: March 2013

N-doped Titanium dioxide (TiO2) nanotube arrays were characterized by scanning electron microscope (SEM)，X-ray Diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) to analyse its surface morphology, crystal types and the doping behavior of nitrogen. The material was used as electrode for photoelectrocatalytic degradation of hexachlorobenzen under irradiation of simulated sunlight. The effects of photocatalysis, electrocatalysis, photoelectrocatalysis, the concentration of Na2SO4 and pH value on degradation of HCB were investigated.
Removal Chromium and Turbidity Using Starch Derivative Flocculant CSAX
Authors: Li Xiao Hong , Hao Xue Kui , Chang Qing
Published: March 2013

An investigation was undertaken regarding the removal chromium ions and turbidity from aqueous solutions by crosslinked starch-graft-polyacrylamide-co-Sodium xanthate (CSAX) containing acylamino、carboxyl and xanthogen groups, which were prepared by grafting copolymerization of crosslinked corn starch, acrylamide (AM), and sodium xanthate in aqueous solution. The performances of CSAX in wastewater treatment were evaluated by flocculation experiment. The effects of the pH of the wastewater were considered. The results show that the CSAX was successfully synthesized with the functions of removing both turbidity and chromium ions from aqueous solution. The highest removal Cr(Ⅵ) took place at pH 2, while the highest removal Cr(Ⅲ) at pH 5. The subsection flocculation process was beneficial to remove both Cr(Ⅵ) and Cr(Ⅲ) synchronously. Cr(Ⅲ) and turbidity have a cooperative removal effect with each other in the process of treating wastewater containing both chromium ions and turbidity.
Synthesis and Paclobutrazol Visible-Light Degradation of Al/S Doped TiO2 Mesoporous Materials with Pyridine as a Template
Authors: Liu Shao You , Zhang Fei , Luo Chen Yan , Jiang Tian Zhi , Feng Qing Ge
Published: March 2013

Al and S co-doped TiO2 (S-Al-TiO2) mesoporous materials as a kind of visible light photo- catalysts are prepared using pyridine as a template through a solid state reaction route. The materials features are characterized by the advanced instruments. The photodegradation kinetic of paclobutra- zol is investigated. It is shown that the doping of S and Al could effectively inhibit the growth of anatase TiO2, both S and Al have entered into the lattice of TiO2. Surface area of 81.3m2/g and narrow pore size distribution (~2.1nm) are presented, it not only enables the visible-light absorption but also promotes photocatalytic property of paclobutrazol. Moreover, within 150 min of visible-light irradiation, the photocatalytic degradation of paclobutrazol approximately follows an order kinetics, and the photodegradation rate in 46.7% and reaction rate constant of 0.00414 min-1 are obtained.
Treatment of Chlorobenzene Containing Wastewater by Titanium Oxide Photocatalyst
Authors: Li Na , Li Guo De , Wu Shi Wei
Published: March 2013

In this study, we choose TiO2 as photocatalysis, and to deal with low concentration chlorobenzene-containing wastewater under the shining of ultraviolet light. Temperature, pH and flux have be inspected. The following conclusion is according to the experiment result: When chlorobenzene's concentration deciding for 50mg/L and TiO2's concentration is 1.0g/L , it is better to get the optimum parameter: temperature is 60°C, flux is 100L/h and in acidic condition.
The Evaluation of Photocatalytic Properties of Iron Doped Titania Photocatalyst by Degradation of Methylene Blue Using Fluorescent Light Source
Authors: Abidov Amir , Allabergenov Bunyod , Tursunkulov Oybek , Lee Jeonghwan , Kim Sang Youp , Lee Eun Young , He Li Li , Kim Sung Jin
Published: March 2013

Transition metal ion-doped titanium dioxide (TiO2) powders were prepared by mechanochemical milling. Photocatalytic properties of the prepared semiconductor were evaluated using photodegradation of methylene blue under UV and visible light. Dye bleaching was observed spectrophotometrically. Color removal was reached after 120 min. The effect of varying concentration of organic dye, amount of TiO2 photocatalyst, particle size, pH, and stirring rate was observed on the efficiency of reaction. The maximum photocatalytic decomposition of methylene blue solution was achieved with 25nm particle size TiO2, which was ascribed to the enlarged surface area. All obtained results were discussed.
Quantum Size Effects of Chemical Bath Deposited ZnSe Thin Films
Authors: Chen Liang Yan , Fang Chao
Published: March 2013

Quantum dots ZnSe have been deposited through chemical bath deposition in thin films form. The nanoscal grain size of as-deposited and thermal treated ZnSe films have been investigated by X ray Diffraction. And optical band gap of those samples have been obtained from absorption spectrum. Both as-deposited and annealed films were with nanocryatlline grain smaller than the Bohr excitonic radius and showed blue shifts of bandgap in quantum size effects. The blue shifted optical bandgap versus grain size has been modeled theoretically.
Effects of Cu Addition on Microstructure and Adhesion Properties of Ti-Al-N Nanocomposite Films Deposited by Magnetron Sputtering
Authors: Feng Chang Jie , Hu Xian , Jiang Yuan Fei , Zhao Qing
Published: March 2013

Ti-Al-Cu-N films with different Cu contents were synthesized on 1Cr11Ni2W2MoV stainless steel by DC magnetron sputtering. The microstructure, composition, microhardness and adhesion properties of the films were characterized by SEM/EDS, XRD, microhardness and scratch tests. The results show that a reduction of the grain size and an increase of hardness in Ti-Al-N films doped with1.04at% Cu were detected. Further increase the Cu content in the Ti-Al-N film, the grain size increases and become irregular, and the microhardness decreases. The adhesion property of Ti-Al-Cu-N films increased slightly comparing with Ti-Al-N film. The effects of Cu contents on the microstructure and adhesion properties of the Ti-Al-N films were discussed
Mechanical Instability of Wedge-Shaped Cr Films Quenched by Silicone Oil during Deposition
Authors: Zhang Yong Ju , Yu Sen Jiang , Zhou Hong , Chen Miao Gen
Published: March 2013

By using the mobile property of silicone oil during deposition, characteristic wedge-shaped chromium (Cr) films have been successfully prepared on glass substrates by direct current magnetron sputtering, and their mechanical instability is investigated. The experiment shows that a disordered network composed of straight-sided buckles, which is due to relief of large compressive stress after deposition, can be widely observed in these films. The size of the buckles increases linearly with the film thickness. In the vicinity of spreading front of the silicone oil, parallel straight-sided buckles perpendicular to the front and bifurcation morphologies can be observed. The influence of the edge effect on the buckle morphologies is also discussed in this paper.
Dependence of the Coating Carbon Layer Configuration of Cordierite Monolith on Coating Reaction Conditions in Methane Decomposition
Authors: Liu Shao Wen , Guan Zhuo Long , Tu Wen Yan , Chen Jiu Ling , Xu Zhi Hua
Published: March 2013

Dependence of the coating carbon layer configuration of cordierite monolith on reaction conditions in methane decomposition was investigated using N2 physisorption, SEM and TEM. The monolith surface area was increased after coating CNFs/CNTs. The microstructure of the coating layers in the coated monolith is dependent on the coating reaction conditions and the entanglement among CNFs/CNTs. High coating temperature and the presence of hydrogen in reaction gas for coating are advantageous to formation of CNTs. By comparison, coating layers of CNFs have better stability than that of CNTs in ultrasonic treatment.
The Property Comparison of Coating Prepared by Oxygen-Acetylene Spray Welding Technology and High-Frequency Induction Remelting Technology
Authors: Zhu Jun Feng , Xiao Wei Feng , Liu Gang , Wang Shu Lin
Published: March 2013

Ni60A coating is obtained by oxygen-acetylene spray welding and high-frequency induction remelting process. Coating Surface, interface between matrix and coating, microhardness and wear resistance are investigated. The results show that both of the processes can achieve coating metallurgically bonded to matrix. But microhardness and wear resistance of Ni60A coating obtained by high-frequency induction remelting process are superior to those of Ni60A coating obtained by oxygen-acetylene spray welding process. At the same time, coating surface by high-frequency induction remelting process is of more brightness owing to less oxide skin. In order to more effectively prevent the hard phase from oxidation, the quartz glass pipe and inert gas should be considered to use in high-frequency induction remelting process.
Effects of Conductive Pigments on the Anti-Corrosion Properties of Zinc-Rich Coatings
Authors: Chen Ling , Zheng Xue Jiao , Ma Hui , Wang Jia Qing
Published: March 2013

Effects of replacing partial zinc dust with conductive pigments on the anti-corrosion properties of ethyl silicate zinc-rich coatings with low zinc content were investigated. Salt spray test, salt immersion test and open circuit potential(OCP) measurement were utilized to evaluate anti-corrosion properties. Experimental results revealed that the effects of conductive pigments content on anti-corrosion properties are similar for di-iron phosphide powder, graphite powder and aluminum powder employed in this article. For every kind of conductive pigments, protection life in salt spray test, protection life in salt immersion test, galvanic protection life and initial OCP change with conductive pigments content increase in a similar way. They all reach an extreme point, and all the extreme points correspond to a same replacing ratio named best replacing ratio. The best replacing ratio is 20,15 and 15wt% for di-iron phosphide powder, graphite powder and aluminum powder respectively. Comparing with non-replacing coatings, conductive pigments-containing coatings at best replacing ratio possess both lower zinc content and better anti-corrosion properties.
Dynamic Strain Aging during Tensile Deformation of Extruded AZ81 Magnesium Alloy
Authors: Zhang Si Qian , Mao Liang , Chen Li Jia
Published: March 2013

Serrated flow has been observed in AZ81 alloy during tensile deformation. The observed static strain ageing effect and negative strain rate sensitivity suggest that the serrated flow is due to interaction between dislocations and solute atoms, know as dynamic strain ageing (DSA). The Portevin-Le Chatelier effect is observed at temperatures between 150oC~200oC and 125oC~200oC. In the microstructure of deformed samples dislocations and twins is observed. It is suggested that the occurrence of the dynamic strain aging is associated with interactions between solute atoms and dislocations.
Die Wear Analysis of Spur-Gear Shaft Hot Extrusion Process
Authors: Wang Guang Chun , Feng Chao , Hao Bin Hai , Wang Tao
Published: March 2013

Improving the extrusion die wear condition was significant to increase the products dimensional accuracy and die life time. In this paper, the hot extrusion process of spur-gear shaft is analyzed by finite element method, and the die wear distributions of different blank shapes and die structures are calculated using the modified Archard model considering the effect of die temperature. According to the results, using the preformed blank shape and floating die could reduce the die wear obviously.
Influence of Temperature Difference on Front End Bending in Hot Slab Rolling
Authors: Tan Y X , Mei R. B. , Wang W J , Liu Y Q , Liu Z , Huo L F , Li C S
Published: March 2013

Front end bending often occurs in the heavy plate mills and roughing stands, which reduce productivity efficiency and the quality of the plates considerably. The effect of temperature difference between top and bottom surfaces of slab and reduction ratio on front end bending was investigated by 3D FEM and the mathematical model was induced. The hexahedral mesh was generated by HyperMesh and embed into the DEFORM system. The results show that the temperature difference leads to the asymmetric distribution of equivalent stress, strain and strain rate in the deformation zone. With the increment of temperature difference and reduction ratio the slab head bends more significant. Additionally, the slab front end perhaps bends to higher temperature side in double phase rolling because of resistance of deformation with different phase. Reducing temperature difference, reducing reduction ratio and avoiding double phase rolling is benificial to reduce front end bending in hot slab rolling.
Extrusion of Powder/Solid Clad Rods for a Desirable Hole Ratio in Powder Region
Authors: Pang Yu Hua , Sun Qi , Zhang Lei , Liu Dong , Yang Yan Hui
Published: March 2013

This paper focuses on the extrusion process of powder/solid clad rods with the desired hole ratio in the center to reduce the weight. The finite-element model about a lot of deformation body extrusion was successfully demonstrated. Raw steel powder and steel tube were consisted as powder/solid rods. While the obvious plastic deformation proceeding in deformation region, the hole ratio clearly lessened, then a little rose apart from the deformation region. The deformation parameters were determined for the purpose to lesson the weight of the rod to about 15% hole ratio in powder deformation region. The extrusion experiment and the tensile property test proved that the integrative property improved while the weight was reduced. The clad rod can be utilized in the solid suck rods.
Heat Spinning Deformation Technology of 7A04 Loading-Wheel
Authors: Xu Heng Qiu , Li Ming Zhe , Li Lin Lin , Zhang Rui , Wang Da Li , Guo Cheng Jun , Chang Jing Yan
Published: March 2013

The program 7A04 aluminum alloy loading-wheels spinning process is described briefly. It formulates the process parameters of aluminum alloy loading-wheels spinning. It uses the aluminum alloy sheet heat spinning process. It analyzes conventional spinning preformed and spinning flanging forming technology regulation. It studies the lubricating technology in the spinning process. The cracking problem is analyzed and solved in the spinning process. The mechanical performance test and the internal organization of the inspection are detected. The finished product meets the requirements. The small batch loading-wheels are produced, which lay the foundation for large quantities loading-wheel spinning production for future.
Study on the Slab Design of Medium Plate Hot Rolling
Authors: Wei Ying Li , Li Xiao Long , Yang Zi Xuan , Tian Ya Qiang , Song Jin Ying , Chen Lian Sheng
Published: March 2013

The slab design, which has direct effect on the yield rate of steel and the productivity of mill in the production of medium plate, is an important neck of the medium plate production. Therefore, for the slab design of medium plate production, all of the factors which will influence yield and production efficiency should be taken into account, such as how to determine the rolling system, the broadening rate, the compression rate; the limited dimension conditions of machine; the sheared residuce and the burning loss. And then, it combines the indents and different specification of on-site finished product to design the slab of medium plate.
Simulation of Die Gap Variation in Temperature Field Distribution of High Strength Steel Hot Stamping Process
Authors: Chen Shu Lai , Cai Yu Jun , Li Guo He , Liu Zhi Gang
Published: March 2013

In the hot stamping process, die gap may affect cooling efficiency of the die and the condition of stress-strain. When other conditions are same, die gap were taken for 0.9t, t, 1.1 t, 1.2 t, t is sheetthickness. Temperature field and thickness distribution of the parts are simulated by ANSYS/LS-DYNA module, it is discovered that the distribution of temperature and thickness is uniform when the die gap is 1t and 1.1t. Finally, an experimental is designed to verify the simulation accuracy.
Research on Deformation of TC4 with Complex Profile in Hot Rolling
Authors: Pang Yu Hua , Zhang Lei , Liu Dong , Yang Yan Hui , Xiao Gui Zhi
Published: March 2013

TC4 alloy is widely used in engine. The method of forming is forging and mechanical process in the old days. With the complex profile of Titanium alloy, the process is quite difficult and lead to low ratio of qualified products. Therefore the method of hot rolling is chosen. According to the basic theory of hot rolling and applying the FEM simulation technology, the one symmetrical pass with different gauge between the two rollers is designed to obtain expected section with the complex profile. In order to restrict the rise of temperature basing on the characteristic of TC4 and make the flowing uniformly to meet the performance requirements, the optimum matching scheme of the pass with the roller is designed first, then the reasonable shape and dimension of the blank is determined, finally the three rolling passes of one blank rolled in one pass with different gauge is decided.
A Novel Three-Dimensional Direct Controlled Cell Assembling System
Authors: Li Yu , Zhang Lei , Liu Chang Yong , Zhao Yu , Sun Wei
Published: March 2013

Solid freeform fabrication (SFF) technology has been widely used to fabricate three-dimensional (3D) cell constructs. As multi-cell construct is a heterogeneous object (He-Object), it is a trend of biomanufacturing to use SFF technology to fabricate multi-cell constructs. In this paper, a novel multi-nozzle deposition system, called as 3D direct controlled cell assembling (CA) system, was developed to fabricate 3D multi-cell constructs. The developed system design was demand-oriented and applied functional modular design method. As the key part of this system, the multi-nozzle system was designed and described in details. Experimental study was conducted and results showed that the system could meet the requirements of the process and be used to fabricate complex 3D cell constructs. By comparison, the developed system could precisely deposite biomaterials with high viscocity and form constructs with big size in continuous deposition mode.
A New Method for Quantitatively Evaluating Defects of the Green Body in Injection Moulding Based on X-Ray Digital Radiography
Authors: Fang Wei , He Xin Bo , Zhang Rui Jie , Qu Xuan Hui
Published: March 2013

Attempts have been made to develop a gray value-matching detection method for quantitative evaluation of defects and density of green parts in metal injection moulding, based on the analysis of X-ray digital radiography images. The results show that the range of gray values should be in about 1.4% when the dimensional accuracy is required within 0.3%, and voids are present where fluctuation of the gray value is larger than 10%. The quantitative evaluation of voids, powder content and density distribution through the gray value-matching can respectively predict severity of voids, shrinkage, and deformation in the sintering stage. Furthermore, the ability to detect defects and particle density distribution of this method allows for the development of an inference system to predict the optimal parameters.
Influence of Tooth Errors and Truing Principles of Grinding Wheel Abrasion for Machining Arc Enveloping Worm
Authors: Jiang Wu Ji , Wei Jing
Published: March 2013

Controlling the tooth errors induced by the variation of diameter of grinding wheel is the key problem in the process of ZC1 worm grinding. In this paper, the influence of tooth errors by d1, m and z1 as the grinding wheel diameter changes are analyzed based on the mathematical model of the grinding process. A new mathematical model and truing principle for the grinding wheel of ZC1 worm is presented. The shape grinding wheel truing of ZC1 worm is carried out according to the model. The validity and feasibility of the mathematical model is proved by case studies. The mathematical model presented in this paper provides a new method for reducing the tooth errors of ZC1 worm and it can meet the high-performance and high-precision requirements of ZC1 worm grinding.
Experimental Research the Cutting Force of the 40Cr Circular Cone Turning
Authors: Niu Xing Hua , Hao Bao Chuan , Cui Li Qiang , Liu Si Yu , Zhang Zhen Tao , Meng Xian Li
Published: March 2013

In this paper,we conducted circular cone turning cutting force measurement test by using orthogonal test method and YDCD piezoelectric unidirectional turning dynamometer,then analyzed the orthogonal test results with the intuitive analysis method. A BP neural network model between the cutting speed,feed rate,cutting depth and the main cutting force is established by using Matlab neural network toolbox and then to be verified. The verification results show that the BP neural network circular cone turning cutting force prediction model has very high prediction accuracy.
Analysis of the Vibration Mechanism in the Turn-Milling Machining of Micro-Miniature Shafts
Authors: Liu Ke Fei , Zhang Guo Zhi , Jin Xin
Published: March 2013

The vibration phenomenon appeared in orthogonal experiments of turn-milling machining of micro-miniature shafts. In order to study the causes and conditions of vibration, the vibration test experiment system was established and frequency spectrum analysis of acquisition data was done. The results show that its machining vibration is caused by the low-frequency flutter of the milling spindle. And the coupling relationship of the micro-miniature shaft and the turning spindle was discussed with FEM. The results show that the vibration of the micro-miniature shaft does not affect the vibration of the turning spindle, while the vibration of the turning spindle can cause the vibration of the micro-miniature in their low order vibration mode.
Distribution of Magnetic Flux Density and Magnetic Force in EMR
Authors: Deng Jiang Hua , Tang Chao , Zhan Yan Ran , Jiang Xing Ying
Published: March 2013

Distribution of magnetic flux density and magnetic force in electromagnetic riveting was investigated with the electromagnetic field coupling model established by the finite element method. The results show the radial magnetic flux density presents a sinusoidal exponential decaying form at a point and the maximum value of radial magnetic flux density lies in about half of the driver plate radius along the driver plate radius direction. The distribution of magnetic force is determined by that of magnetic flux density and the magnetic force is a body force, which weakens very quickly from the inside to the outside of the driver plate. In order to prevent penetration of magnetic field, the thickness of driver plate is an important parameter to increase the energy utilization ratio.
Research on Repair Welding Processes of a Bainite Steel Frog
Authors: Wang Qiu Ying , Hu Zhi Bo , Zhang Ming Yue , Zhou Yi Lin , Liu Jin Bo , Chen Hui
Published: March 2013

This paper introduced a kind of bainite steel used for frog, and studied its repair welding processes. In this paper, four different welding processes were designed. Optical microscopy, scanning electron microscopy, vicker hardness tester, wear tester, impact tester, and high temperature abrasion tester were used to test microstructures, hardness, wear weight loss, impact absorbing energy and wear morphology. The conclusion was that when the current was 120A and the preheat temperature was 250°C the hardness of surfacing metal was the highest, the wear weight loss was least and the impact absorbing energy was the highest. In practical repairing works, this process could be considered.
Effect of Current Waveform on Droplet Oscillation in GMAW
Authors: Xiao Jun , Chen Shu Jun , Zhang Guang Jun , Zhang Yu Ming
Published: March 2013

The active droplet oscillation is a method previously proposed to detach the droplet at currents below the transition current. In this method, a droplet oscillation is actively excited when the current is switched from the exciting peak level to base level. The downward momentum of the droplet is utilized to enhance the droplet detachment. In this work, the current waveform is modified to achieve stronger droplet oscillation with lower average current. The critical change is to separate the droplet growing and exciting processes such that the two processes can be controlled independently. The heat input can thus be reduced, and stronger droplet oscillation is obtained. A further optimized current waveform is proposed to maximize the droplet oscillation energy despite the growing current level.
Effect of the Wire Temperature on the Weld Formation in GMAW
Authors: Ni Jun , Gao Hong Ming
Published: March 2013

An arc-preheating wire GMAW process is proposed in this paper. The welding wire is preheated by a TIG arc to enhance the wire melting. As a result, the welding current is decrease. So the improved GMAW process is aimed at high efficiency welding with a low level heat input. In this paper, the welding system is designed. The wire temperature is measured by a pyrometer. The preheating current effect on the wire temperature is analyzed. In addition, the influence of the wire temperature on the weld current and weld formation are analyzed compared with conventional GMAW. The results show that the preheated wire can significantly enhance the wire melting. By increasing the temperature of the welding wire, the welding current decrease and the heat input of the base metal reduce accordingly. The shallow penetration and large reinforcement height are obtained at the arc-preheating wire GMAW process.
A Study of Material Flow Behavior in Thickness Direction in Friction Stir Welding of 7075 Alloy Plate
Authors: Guo Zheng Hua , Liu Wen Long , Li Cheng Zhong , Cui Jun Hua , Zhao Gang Yao
Published: March 2013

Friction stir welding, which is considered to be a solid-state welding, possesses several advantages over conventional welding processes, is an effective approach to weld high-strength, large thickness and dissimilar materials. Material flow behavior on FSW was generally acknowledged to have effects on weld property. The material flow behavior in thickness direction of advancing and retreating side was analyzed by a numerical model established with cone-shape tool pin. Numerical results indicate that there exist material flow in thickness direction on both sides and the behavior was affected by welding and tool pin rotation speed. Decrease welding speed or increase rotation speed would make material deformation intensified, and increase the fluidity of the material.
Ultrafast Laser Machine Based on All-Fiber Femtosecond Laser System
Authors: Li Dong Juan , Cheng Guang Hua , Yang Zhi , Wang Yi Shan
Published: March 2013

A femtosecond laser machine consisting of femtosecond fiber laser, trepanning head, linear motor stages system and Siemens 840D system has been integrated for industry application. The femtosecond laser source is all fiber system which contains a fiber mode-lock laser at 1053 nm with a repetition rate of 3.9 MHz, a double-cladding gain fiber amplifiers and a PCF amplifier. An acoustical modulator has employed to tune repetition rate from 3.9 MHz to 100 KHz. An in-line fiber chirped grating is used to stretch the pulse duration to 700 ps. After the PCF amplifier pulse is compressed to sub-ps with 50% efficiency based two grating compressor. The system outputs an average power of 15 W at 100 KHz and 800 fs. Using four wedges trepanning head, cylinder hole is drilled in 1mm thickness SiC ceramics in 30 s.
Experimental Research on Flight Trajectory of Edge Electron of the Electron-Beam in the Electron Gun of Furnace
Authors: Zhang Dong Hui , Liu Chun Dong , Zhang Landi , Wang Zhan Ying
Published: March 2013

An experimental measuring method of flight trajectory of edge electron of the electron-beam in the electron gun of furnace was designed. Intermediate perforated copper foil plate is placed in parallel at a key position within the electron gun. The theoretical beam diameter of the electron beam which is reaching the position can be obtained through measuring pore diameter in copper foil plate left after being broke down by the electron-beam, so experimental data got can be verified the theoretical results.