2D C/SiC-ZrB2复合材料的烧蚀性能

用ZrB2微粉对2D C/SiC基体进行改性,研究了化学气相渗透结合浆料浸渍及先驱体浸渍裂解工艺制备2DC/SiC-ZrB2复合材料在氧-乙炔焰和1800℃甲烷风洞环境中的烧蚀行为.结果表明:在氧-乙炔环境中,2D C/SiC-ZrB2的线烧蚀率和质量烧蚀率分别为6.1×10-2 mm/s和1.0×10 -2g/s,相对2D C/SiC复合材料而言,ZrB2微粉并没有提高C/SiC复合材料的抗烧蚀性能.在1800℃甲烷风洞环境中,涂层致密度起主要作用,涂层致密度相同时,复合材料的开气孔率越大,质量烧蚀率越大,ZrB2微粉的渗入对C/SiC复合材料的烧蚀性能影响不大.

Ablation Properties of 2D C/SiC-ZrB2 Composite

2D C/SiC-ZrB2 composite was fabricated by combining chemical vapor infiltration,ZrB2 slurry infiltration and polymer infiltration and pyrolysis method.The ablation properties of the composite under oxyacetylene flame and 1800℃ methane combustion wind tunnel were studied.The results show that under the oxyacetylene flame environment,the linear ablation rate and the mass ablation rate of the 2D C/SiC-ZrB2 are 6.1×10-2mm/s and 1.0×10-2g/s respectively.The anti-ablation performance is improved by infiltrated ZrB2 particles into C/SiC matrix.Under the 1800℃methane combustion wind tunnel,the coating density plays a major role on the ablation behavior.At the same coating density,the mass ablation rate increases with the open porosity of the composites.The addition of ZrB2 to C/SiC has little effect on the anti-ablation performance.