Preparation and mechanical properties of C/C-SiC-ZrC-CeB6 composites
C/C-SiC-ZrC-CeB6 composites with different CeB6contents were prepared by slurry infiltration and precursor infiltration and pyrolysis method.Effects of CeB6contents on micro-structure and mechanical properties were investigated.The results show that the CeB6content brings important effect on mechanical properties.The C/C-SiC-ZrC-CeB6 composites with CeB6 content of 8%exhibit higher flexural and compressive strength than that with lower CeB6content of 3.8%.The flexural and compressive strength of the former(8%)are 292.25 MPa and 276.90 MPa,respectively,and the strength improved 20.86%and 35.70%than those of the latter(3.8%).Meanwhile,with the increased CeB6content,the reaction between CeB6and ZrC enhances the interfacial bonding between carbon fiber and matrix,resulting in the fracture mode transformed from pseudoplastic to brittle fracture during flexural test.
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