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Effect of Al2O3sf addition on the friction and wear properties of (SiCp+Al2O3sf)/Al2024 composites fabricated by pressure infiltration 被引量:3
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作者 Hui Xu Gong-zhen Zhang +3 位作者 Wei Cui shu-bin ren Qian-jin Wang Xuan-hui Qu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第3期375-382,共8页
Aluminum(Al) 2024 matrix composites reinforced with alumina short fibers(Al_2O_(3sf)) and silicon carbide particles(SiC_p) as wear-resistant materials were prepared by pressure infiltration in this study. Further, the... Aluminum(Al) 2024 matrix composites reinforced with alumina short fibers(Al_2O_(3sf)) and silicon carbide particles(SiC_p) as wear-resistant materials were prepared by pressure infiltration in this study. Further, the effect of Al_2O_(3sf) on the friction and wear properties of the as-synthesized composites was systematically investigated, and the relationship between volume fraction and wear mechanism was discussed. The results showed that the addition of Al_2O_(3sf), characterized by the ratio of Al_2O_(3sf) to SiC_p, significantly affected the properties of the composites and resulted in changes in wear mechanisms. When the volume ratio of Al_2O_(3sf) to SiC_p was increased from 0 to 1, the rate of wear mass loss(K_m) and coefficients of friction(COFs) of the composites decreased, and the wear mechanisms were abrasive wear and furrow wear. When the volume ratio was increased from 1 to 3, the COF decreased continuously; however, the K_m increased rapidly and the wear mechanism became adhesive wear. 展开更多
关键词 aluminum matrix COMPOSITES silicon CARBIDE particles ALUMINA short fibers friction PROPERTIES wear PROPERTIES INFILTRATION
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Effect of graphite powder as a forming filler on the mechanical properties of SiCp/Al composites by pressure infiltration 被引量:2
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作者 Wei Cui Hui Xu +3 位作者 Jian-hao Chen shu-bin ren Xin-bo He Xuan-hui Qu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第5期601-607,共7页
(38vo1% SiCp + 2vo1% A1203f)/2024 A1 composites were fabricated by pressure infiltration. Graphite powder was introduced as a forming filler in preform preparation, and the effects of the powder size on the microst... (38vo1% SiCp + 2vo1% A1203f)/2024 A1 composites were fabricated by pressure infiltration. Graphite powder was introduced as a forming filler in preform preparation, and the effects of the powder size on the microstructures and mechanical properties of the final com- posites were investigated. The results showed that the composite with 15 μm graphite powder as a forming filler had the maximum tensile strength of 506 MPa, maximum yield strength of 489 MPa, and maximum elongation of 1.2%, which decreased to 490 MPa, 430 MPa, and 0.4%, respectively, on increasing the graphite powder size from 15 to 60 μm. The composite with 60 μm graphite powder showed the highest elastic modulus, and the value decreased from 129 to 113 GPa on decreasing the graphite powder size from 60 to 15 μm. The differences between these properties are related to the different microstructures of the corresponding composites, which determine their failure modes. 展开更多
关键词 metal matrix composites ALUMINUM silicon carbide GRAPHITE preparation pressure infiltration mechanical properties
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Sintering behavior and thermal conductivity of nickel-coated graphite flake/copper composites fabricated by spark plasma sintering 被引量:1
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作者 Hui Xu Jian-hao Chen +2 位作者 shu-bin ren Xin-bo He Xuan-hui Qu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第4期459-471,共13页
Nickel-coated graphite flakes/copper(GN/Cu) composites were fabricated by spark plasma sintering with the surface of graphite flakes(GFs) being modified by Ni–P electroless plating. The effects of the phase trans... Nickel-coated graphite flakes/copper(GN/Cu) composites were fabricated by spark plasma sintering with the surface of graphite flakes(GFs) being modified by Ni–P electroless plating. The effects of the phase transition of the amorphous Ni–P plating and of Ni diffusion into the Cu matrix on the densification behavior, interfacial microstructure, and thermal conductivity(TC) of the GN/Cu composites were systematically investigated. The introduction of Ni–P electroless plating efficiently reduced the densification temperature of uncoated GF/Cu composites from 850 to 650℃ and slightly increased the TC of the X–Y basal plane of the GF/Cu composites with 20 vol%–30 vol% graphite flakes. However, when the graphite flake content was greater than 30 vol%, the TC of the GF/Cu composites decreased with the introduction of Ni–P plating as a result of the combined effect of the improved heat-transfer interface with the transition layer, P generated at the interface, and the diffusion of Ni into the matrix. Given the effect of the Ni content on the TC of the Cu matrix and on the interface thermal resistance, a modified effective medium approximation model was used to predict the TC of the prepared GF/Cu composites. 展开更多
关键词 copper matrix composites graphite flake nickel-phosphorus transition layer sintering behavior thermal conductivity
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Effect of sintering on the relative density of Cr-coated diamond/Cu composites prepared by spark plasma sintering 被引量:4
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作者 Wei Cui Hui Xu +3 位作者 Jian-hao Chen shu-bin ren Xin-bo He Xuan-hui Qu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第6期716-722,共7页
Cr-coated diamond/Cu composites were prepared by spark plasma sintering. The effects of sintering pressure, sintering temperature, sintering duration, and Cu powder particle size on the relative density and thermal co... Cr-coated diamond/Cu composites were prepared by spark plasma sintering. The effects of sintering pressure, sintering temperature, sintering duration, and Cu powder particle size on the relative density and thermal conductivity of the composites were investigated in this paper. The influence of these parameters on the properties and microstructures of the composites was also discussed. The results show that the relative density of Cr-coated diamond/Cu reaches ~100% when the composite is gradually compressed to 30 MPa during the heating process. The densification temperature increases from 880 to 915℃ when the diamond content is increased from 45vol% to 60vol%. The densification temperature does not increase further when the content reaches 65vol%. Cu powder particles in larger size are beneficial for increasing the relative density of the composite. 展开更多
关键词 metal matrix composites copper diamond relative density spark plasma sintering
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Thermal properties of diamond/Al composites by pressure infiltration:comparison between methods of coating Ti onto diamond surfaces and adding Si into Al matrix 被引量:5
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作者 Cai-Yu Guo Xin-Bo He +1 位作者 shu-bin ren Xuan-Hui Qu 《Rare Metals》 SCIE EI CAS CSCD 2016年第3期249-255,共7页
This study was pertained to the effects of Ti coating on diamond surfaces and Si addition into Al matrix on the thermal conductivity(TC) and the coefficient of thermal expansion(CTE) of diamond/Al composites by pr... This study was pertained to the effects of Ti coating on diamond surfaces and Si addition into Al matrix on the thermal conductivity(TC) and the coefficient of thermal expansion(CTE) of diamond/Al composites by pressure infiltration.The fracture surfaces,interface microstructures by metal electro-etching and interfacial thermal conductance of the composites prepared by two methods were compared.The results reveal that Ti coating on diamond surfaces and only12.2 wt% Si addition into Al matrix could both improve the interfacial bonding and increase the TCs of the composites.But the Ti coating layer introduces more interfacial thermal barrier at the diamond/Al interface compared to adding 12.2 wt% Si into Al matrix.The diamond/Al composite with 12.2 wt% Si addition exhibits maximum TC of 534 W·m^-1·K^-1and a very low CTE of 8.9×10^-6K^-1,while the coating Ti-diamond/Al composite has a TC of 514 W·m^-1·K^-1 and a CTE of 11.0×10^-6K^-1. 展开更多
关键词 Metal matrix composites Coating Thermal conductivity Coefficient of thermal expansion Pressure infiltration
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