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首页> 外文期刊>Surface Engineering >Microstructure and oxidation protective ability of MoSi2-SiC-Si coating toughened with SiC whiskers for carbon/carbon composites
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Microstructure and oxidation protective ability of MoSi2-SiC-Si coating toughened with SiC whiskers for carbon/carbon composites

机译：SiC晶须增韧的MoSi 2 -SiC-Si涂层的微观结构和抗氧化性能

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摘要

To prevent carbon/carbon (C/C) composites from oxidation at high temperatures, a SiC whisker (SiCw) toughened MoSi2-SiC-Si coating was prepared on the C/C surface by a two step technique of slurry and pack cementation. Scanning electron microscopy (SEM) analysis shows that, with the content of SiCw increasing, the dimensions and frequency of cracks in the coating decrease obviously. At the same time, the thickness and compact degree of the coating reduce with the increase of the SiCw content. Oxidation tests show that, as the content of SiCw is 10 wt-%, the coating possesses a better anti-oxidation property, and the weight loss of the coated sample is only 0˙8% after oxidation at 1773 K for 200 h. The weight loss of the as-coated C/C composites is primarily due to the reaction of the C/C matrix and oxygen diffusing through the penetration cracks and holes in the coating.
机译：为了防止碳/碳（C / C）复合材料在高温下氧化，通过两步法在C / C表面制备了SiC晶须（SiCw）增韧的MoSi 2 -SiC-Si涂层泥浆和堆积胶结技术。扫描电子显微镜（SEM）分析表明，随着SiCw含量的增加，涂层裂纹的尺寸和出现频率明显降低。同时，随着SiCw含量的增加，涂层的厚度和致密程度降低。氧化试验表明，当SiCw含量为10 wt％时，涂层具有较好的抗氧化性能，在1773 K下氧化200 h后，涂层样品的失重仅为0˙8％。涂覆后的C / C复合材料的重量损失主要归因于C / C基体与氧气扩散通过涂层中的渗透裂纹和孔的反应。

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