Effect of treatment temperature on mechanical properties of C/C-ZrC-SiC composites prepared by powder-precursor method
C/C-ZrC-SiC composites were prepared by powder-precursor method using modified polymethylsilane(PMS)as silicon source and zirconium carbide as zirconium source.The effects of heat treatment temperatures on the C/C-ZrC-SiC composites were in-vestigated by comparing the changes in microstructure and mechanical properties of the composites after heat treatment at 1 400,1 600,1 800℃.At 1 400℃,the SiC-ZrC ceramics and the carbon fibers remain densely bonded and jointly resist bending deforma-tion,and the prepared C/C-ZrC-SiC composites have a flexural strength of 182 MPa.At 1600℃and 1 800℃,the SiC undergoes a crystalline transition that leads to a change in morphology and a decrease in bond strength,showing poor mechanical properties,with the flexural strength decreasing to 78 MPa and 65 MPa,respectively.
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