Abstract：The C/SiC-ZrB2-TiB2 composites were prepared by reactive melt infiltration process. The ablation properties of the composites were tested under a single plasma heat flow and a biphasic flow ablation environment in which the heat flow was coupled with the particle flow, respectively, and the ablation resistance mechanism of the composites was investigated. The results show that the C/SiC-ZrB2-TiB2 composites exhibit excellent ablation resistance in both thermal environments. The linear ablative rates of the composites are 0.38 μm/s and 19.80 μm/s under the action of single heat flow at ablation temperatures of 1 920 ℃ and 2 230 ℃, respectively, and a stable oxide layer consisting of ZrxTi1-xO2 skeleton and liquid filled phase is formed on the surface, which can slow down the ablation. The linear ablative rates of the composites under biphasic flow are 2.93 μm/s and 21.91 μm/s at ablation temperatures of 2 020 ℃ and 2 190 ℃, respectively. SiC-ZrB2-TiB2 ceramic matrix and its oxide layer can maintain sufficient strength at higher temperatures to resist particle exfoliation, and the carbon fibre ablation level is low, which can provide a better reinforcement and toughening effect.
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2023, Vol. 28 
