Ablation performance of (C/C)/ZrB2-SiC composites by different fabrication methods
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摘要: 采用涂刷法和浆料浸渍法在(C/C)/SiC复合材料基础上制备了(C/C)/ZrB2-SiC复合材料,采用微观分析和氧-乙炔烧蚀试验,并借助SEM、EDS等手段,研究三种材料的微观结构、抗烧蚀性能和抗烧蚀机制。结果表明:制备的(C/C)/ZrB2-SiC复合材料的抗烧蚀性能优于(C/C)/SiC复合材料,相比(C/C)/SiC复合材料,涂刷法制备的(C/C)/ZrB2-SiC复合材料600 s和1 000 s线烧蚀率下降33.3%和15.4%,质量烧蚀率下降51.5%和25.5%;浆料浸渍法制备的(C/C)/ZrB2-SiC复合材料600 s和1 000 s线烧蚀率下降20%和28.8%,质量烧蚀率下降42.4%和53.2%,其在高温阶段形成的ZrO2-SiO2玻璃态熔融层起到了抗氧化冲刷的作用,大幅提高其抗烧蚀性能。三种材料的烧蚀机制是热化学烧蚀、热物理烧蚀和机械剥蚀的综合作用。
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关键词:
- (C/C)/ZrB2-SiC /
- 涂层 /
- 浆料浸渍 /
- 烧蚀性能 /
- 烧蚀机制
Abstract: The (C/C)/ZrB2-SiC composites were prepared by slurry painting method and slurry impregnation method based on (C/C)/SiC composites. The ablation characteristics, phase composition and microstructure of the three kinds of composites were tested by oxyacetylene flame, SEM and EDS, respectively. The ablation mechanism was also investigated. The results indicate that compared with (C/C)/SiC composites, the (C/C)/ZrB2-SiC composites show better ablation resistance properties. As to the uncoated (C/C)/SiC composites, the linear ablation rate of the (C/C)/ZrB2-SiC composites is reduced by 33.3% and 15.4%, and the mass ablation rate reduces by 51.5% and 25.5% after ablation for 600 s and 1 000 s respectively, and the linear ablation rate of the micro-particle ZrB2 impregnation composites is reduced by 20% and 28.8%, and the mass ablation rate reduces by 42.4% and 52.3% after ablation for 600 s and 1 000 s respectively. A ZrO2-SiO2 glassy melting layer formed at high temperature plays an important role in antioxidant and antierosion, which induces in better ablation resistance properties of the (C/C)/ZrB2-SiC composites. The ablation mechanism is a synergistic effect of thermo-chemical ablation, thermo-physical ablation and mechanical erosion.-
Key words:
- (C/C)/ZrB2-SiC /
- coating /
- slurry impregnation /
- ablation property /
- ablation mechanism
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