Papers by Keyword: SiC Particles

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Authors: Hong Jie Luo, Hao Lin, Jian Kun Zhang, Guang Chun Yao
Abstract: Two basic methods can be used to fabricate aluminum foam. One is powder metallurgy route which can provide the near net shape casting containing aluminum foam core, and the other is melt foaming route which can prepare large scale aluminum foam plate directly. To combine the advantages of above two methods, the precursor was obtained through melt foaming route and then baked in a furnace like that of powder metallurgy method in this investigation. The test results indicated that the SiC and TiH2 particles after treatment in air could be dispersed in Al-Si matrix alloy melt and the precursors were obtained. The porosity and their pore diameter of the precursors decreased along with the temperature reducing as well as the magnesium or SiC particles adding. The density of Al-Si alloy foam decreased with the elevation of baking temperature and extension of heating time before collapse of foam block occurred. The foaming process parameters were seriously affected by the aluminum alloy composition.
Authors: Qiu Bao Ouyang, Wen Long Wang, Di Zhang, Guo Ding Zhang
Abstract: Discontinuously reinforced aluminum (DRA) composites are attractive for a large range of engineering applications because of its excellent wear-resistance, high thermal conductivity and light weight etc. In this paper, DRA composites were designed and fabricated especially for automotive application, and their properties were measured. Brake discs of DRA composites were manufactured and their braking performances were investigated, including brake velocity, brake pressure, brake torque, brake deceleration, brake time and surface temperature etc. The test results show DRA composites exhibit an excellent braking performance.
Authors: Yang Zhang, Xi Tao Wang, Li Chen, Xin Bo He
Abstract: In this studies, Mg(Al)-50 vol.% SiC particle composites were fabricated by pressure infiltration with the two different matrix base materials of Mg and Mg-6Al alloy. Thermal conductivities of the two composites were compared and the effect of addition was studied using X-ray diffraction and scanning electron microscopy (SEM). The analysis of the X-ray diffraction shows that the Al-addition to the Mg causes a contraction of the Mg lattice parameters, which brings a better matching between the matrix and SiC particle. The microstructure and the fracture surface of the composite were characterized by using SEM. The alloying element Al exists mainly in the form of α solid solution, which has a uniform distribution in matrix. From calculation, the interfacial thermal barrier resistance of the Mg-6Al/SiCp composite is about one order of magnitude lower than that of the Mg/SiCp composite.
Authors: Zhen Lin Lu, Han Jin, Yong Xin Zhou, Hui Xie
Abstract: The slurry erosion wear performances of the SiCp/cast iron surface composite, which was prepared by infiltrating molten cast iron into SiC particles preforms, were studied on self-made slurry inject erosion wear machine. The results show that the erosion wear rate of the SiCp/cast iron surface composite would be the lowest at impact angle of 30°, and the largest at impact angle of 60°. The erosion wear rate increases gradually when impact angle is changed from 30° to 60°, and then decreased with increasing the impact angle. The erosion wear mechanism of the SiCp/cast iron surface composite is dominated by cutting and grooving at low impact angle, and by fatigue spalling and cutting at high impact angle. For the gray cast iron, the erosion wear rate of would be increased gradually with the increase of impact angle, reaching the peak value at 90°, which indicates the typical characteristics of brittle material in slurry erosion wear process.
Authors: R. Ivănuş
Abstract: The powder metallurgy technique was adopted to prepare SiCp copper alloy matrix composites. The mechanical properties of the composites were measured to investigate the influence of processing parameters, SiC particle characteristics and metallic coating (copper) of the SiC particles. It was found that the mechanical properties of the composites prepared by pressing, sintering, re-pressing, and resintering are superior to those of composites prepared by the pressing and sintering route, and that sintering temperature was an important factor in controlling composite properties. Changes in hardness, theoretical density, ultimate tensile strength, and wear resistance of composites containing SiC of varying silicon carbide content were observed. In all cases, composites made from copper coated SiCp exhibited better properties than those from uncoated particles.
Authors: Chang Woo Lee, Y.S. Shin, S.H. Yoo
Abstract: The effect of SiC nanoparticle dispersion was investigated for microstructure change and mechanical properties of Sn-Bi electroplated alloys. The diameters of SiC nanoparticle in this study were 45-55 nm. The SiC nanoparticles were mixed with Sn-Bi electroplating and then the nanoparticles were dispersed with ultrasonic vibrator. After the dispersion, the SiC dispersed Sn-Bi alloys were electroplated on Cu deposited Si wafer. The microstructure and mechanical properties of the sample were evaluated by FE-TEM, FE-SEM, EDS, and shear tester. For TEM observation, the specimens were prepared by ultramicrotome and FIB. The SiC nanoparticles were well-dispersed in Sn-Bi alloy. SiC particles were located near grain boundaries or grain inside. The average grain size of the solder alloy was decrease about 30% compared with the grain size of Sn-Bi alloy prepared in the same condition. Due to the grain refinement and dispersion hardening by SiC nanoparticles, the SiC dispersed Sn-Bi alloy is expected to obtain high reliability and joining strength when it applied to interconnection materials.
Authors: Hideaki Sano, Guo Bin Zheng, Yasuo Uchiyama
Abstract: B4C and SiC particle-dispersed carbon composite were fabricated from calcined pitch coke, B4C and SiC with various particle size by grinding and then pressureless sintering. During non-isothermal oxidation test up to 1400°C in air atmosphere, oxidation behavior of the C/B4C/SiC composite was clarified by means of calculation of kinetic parameters using experimental data of mass change, gas formation of CO2, and oxygen gas consumption. Amount of the matrix carbon oxidized above 800°C in the composite with SiC particle of 0.4 µm and 0.9 µm in size was less than that in the composite with SiC particle of 50 nm and 1.8 µm in size. The oxidation of the matrix carbon was shown to depend upon the formation of B2O3 glass below 800°C oxidation, and that of SiO2 glass above 800°C. The composite containing SiC with 20 nm in size was stable against oxidation above 1400°C except the temperature ranging from 900°C to 1100°C.
Authors: Zeng Lei Ni, Ai Qin Wang, Jing Pei Xie
Abstract: This paper studied the combined effects of particle size and distribution on the mechanical properties of the SiC particle reinforced Al-30Si alloy composites. The microstructure of experimental material was analyzed by SEM, the tensile strength and physical properties were examined. The results show that, with the increase of the SiC particle size in the composites, the clustering degree of the SiC particles decreases in the matrix, the SiC particles distribute more ununiformly. The tensile strength is influenced by the SiC particle size, the tensile strength of the composite reinforced by 13μm sized SiC particles is the highest.
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