Abstract
The strengthening effect of aluminum (Al) alloy as the second phase matrix on C f /SiC-Al composites was investigated, and microstructures and compression performance of the composites were characterized and tested. The results show that compressive strength and modulus of C f /SiC-Al composites were 627±21.4 MPa and 98±2.4 GPa, respectively. Compared with C f /SiC composites prepared by chemical vapor infiltration (CVI) process, the compressive strength increased by 34.8%, and the modulus increased by 8.9%. The introduction of Al alloy by vacuum pressure infiltration process significantly improved the ability of the composites to withstand pressure loads. However, due to the Al alloy filling in the inter-bundle pores inside C f /SiC composites, the space for the fiber to be deformed by force was limited, and the length of the fiber extraction was shortened. • Aluminum alloy was successfully introduced into C f /SiC composites prepared by CVI. • Aluminum alloy can effectively fill the inter-bundle pores inside the C f /SiC. • The compressive strength of the as-prepared composites was significantly improved. • The filling of aluminum alloy changes the fracture mode of the composites.
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