Abstract The SiC coating with embedded interface was prepared on the surface of C/C composites by pre-oxidation treatment and chemical vapor deposition. The effects of pre-oxidation time on the microstructure of C/C composites and SiC coating were investigated, and the anti-oxidation test at 1 500 ℃ of the coated sample was carried out. The results show that the surface of the pre-oxidized material possesses porous structure, and the oxidation rate of matrix is greater than that of fiber. As the pre-oxidation time increases, the surface roughness of C/C composites and the embedded depth of the SiC coating increase, the coating crack narrows. In the high temperature oxidation experiments, the mass loss rates of the coated samples prepared by pre-oxidation treatment of 6 min and 9 min are 2.34% and 1.89% respectively after oxidation for 21 h. The samples prepared by 6min pre-oxidation show better oxidation resistance, and the mass loss rate is 4.11% after static oxidation for 26 h. These two samples can both produce “pinning effect” on the matrix in the first 21 h oxidation test. Nevertheless after 21 h, the thermal stress damage of the laminar pyrolytic carbon in the samples prepared by 9min pre-oxidation treatment lead to the decrease of interfacial bonding strength, which is the main reason for its rapid failure.
WANG Yujie,ZHANG Mingyu,SU Zhean, et al. Effect of pre-oxidation treatment time on C/C composites and its SiC anti-oxidation coating[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 591-599.
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2018, Vol. 23 
