Materials Reports  2020, Vol. 34 Issue (Z2): 381-385 |
| METALS AND METAL MATRIX COMPOSITES |
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| 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
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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 |
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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%.
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Published: 08 January 2021
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| Fund:This work was financially supported by the Action Project of Guangdong Academy of Sciences to Build a First-Class Research Institution (2019GDASYL-0501014,2019GDASYL-0104024,2019GDASYL-0502009); Guangdong Province Science and Technology Planning Project (2017A070701029), Guangdong Province Science and Technology Innovation Strategy Special Project (2018dr013,2018dr005). |
| About author:: Jianning Lu received his B.E. degree in materials science and engineering and M.S. degree in materials engineering from Central South University (CSU) in Sep. 2010—Jun. 2017. He has published 2 journal papers as the first author, applied 5 national invention patents and 2 of them were authorized. His research inte-rests focus on the ceramic additive manufacturing and particle-reinforced aluminum matrix composites, including material design, structure characterization, thermodynamic properties and mechanism research. As a key staff member, he participated in the Guangzhou Science and Technology Plan Project, Research and Development project of Guangdong Academy of Sciences, and as a general staff, he participated in a number of research and development projects. Juan Wang, professor of engineer. She was elected as a top-notch young talent in science and technology innovation of the Guangdong Special Support Plan in 2017.Mainly engaged in the preparation and industrial application of high-performance ceramic-reinforced metal matrix composite materials,and carry out scientific research around steel wear-resistant materials,advanced structu-ral ceramics,interface connections,composite solders,and genetic engineering of materials. Presided over/participated in more than 50 national,provincial,and municipal scientific research projects,and the total project funding exceeded 30 million yuan. Published more than 30 papers and 1 monograph. Lead or participate in the formulation of 11 national standards,corporate standards and corporate stan-dards. Applied 60 invention patents and obtained 33 authorized invention patents. She has won 8 awards at various levels including the Guangdong Gold Patent Award,Guangdong Science and Technology Progress First Prize,China Nonferrous Industry Science and Technology First Prize. |
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