Effect of Surface Oxidation Treatment on the Structure and Properties of SiC/A356 Al Composites
LU Jianning1,2, WANG Juan1,2, LIN Yingfei1,3, ZHENG Kaihong1, WANG Haiyan1,3
1 Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, China 2 Guangdong Yueke New Material Co., Ltd., Meizhou 514768, China 3 Institute of Meizhou Yueke New Materials and Green Manufacturing, Meizhou 514768, China
Abstract: The SiC/A356 Al composites were prepared by compression molding process and pressure infiltration method. XRD, SEM and EDS were used to characterize the phase composition, microstructure and particle size distribution of SiC particles before and after oxidation treatment, the effects of the raw/oxidized SiC particle on the interfacial structure, flexural strength, linear expansion coefficient and thermal conductivity of the composites were studied. The fracture morphology of the composite was analyzed by SEM and its fracture mechanism was discussed. The results show that the SiC/A356 composites with uniform dispersion of SiC particles, clean interface and nearly complete compactness can be obtained by this method. The SiO2 film formed on the surface of SiC particle by surface oxidation treatment can effectively inhibit the formation of Al4C3 brittle phases, but it also causes the chemical reaction combination between SiC and A356 to transform into metallurgical combination, resulting in a marked decrease in the bending strength and a slight reduction in the linear expansion coefficient of the as-prepared specimens, the thermal conductivity of the composites is significantly improved at the same time. Particularly, compared to composite where the reinforcing phase is the raw SiC particles, the bending strength of the oxidized SiC particle reinforced composite is approximately 1/2, the coefficient of linear expansion is only reduced (0.59-0.99)×10-6 K-1 in the range of 30—350 ℃, and the thermal conductivity increased by 42.86%.
路建宁, 王娟, 林颖菲, 郑开宏, 王海艳. 表面氧化处理对SiC/A356 Al复合材料组织及性能的影响[J]. 材料导报, 2020, 34(Z2): 381-385.
LU Jianning, WANG Juan, LIN Yingfei, ZHENG Kaihong, WANG Haiyan. Effect of Surface Oxidation Treatment on the Structure and Properties of SiC/A356 Al Composites. Materials Reports, 2020, 34(Z2): 381-385.
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