Material Characterization of Al-Si/SiCpp Composite via Pressureless Infiltration Using Polystyrene as External Binder

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In this study, SiC-reinforced Al-Si matrix composite was prepared by pressureless infiltration using polystyrene as a binder. The molten Al-Si alloy was infiltrated into preform that previously pre-mixed with different volume percentage (0, 10, 20, 30 and 40 vol%) of SiCp and polystyrene. The result showed that the infiltration of Al-Si/SiC composite was possible using polystyrene beads as a binder. The distribution of SiC particles was uniformly distributed within the Al-Si matrix. At lower SiC content, as a result of Si deficiency, Al4C3 was favorable to be formed. The presence of Al4C3 demonstrated poor properties of Al-Si/SiC composite. But, the hardness and density was improved with increasing SiC content.

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948-952

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December 2012

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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