Abstract
SiC/SiBCZr composites were prepared through polymer impregnation and pyrolysis process using the second generation SiC fibers as raw material. The effects of surface substrate removal, secondary densification, and deposition coating on the structure, mechanical properties, and high temperature stability of SiC/SiBCZr composites were investigated. Results showed that the porosity of SiC/SiC composites could be greatly diminished by the optimized treatment process, and the surface of SiC/SiBCZr composites is uniformly filled into the pores by β-SiC particles, thereby achieving the sealing effect. Meanwhile, the as-prepared SiC/SiBCZr composites had excellent high temperature structural stability. At the later stage of oxidation reaction, borosilicate oxidation products with moderate fluidity, fluid lava form and self repairing function generated from ceramic matrix can effectively inhibit the oxidation reaction and improve the high temperature structural stability of SiC/SiBCZr composites. The above-mentioned high temperature structural stability provided the foundation and technical support for improving the service life and expanding the application of SiC/SiBCZr composites.
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