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首页> 外文期刊>CERAMICS INTERNATIONAL >A double layer nanostructure SiC coating for anti-oxidation protection of carbon/carbon composites prepared by chemical vapor reaction and chemical vapor deposition
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A double layer nanostructure SiC coating for anti-oxidation protection of carbon/carbon composites prepared by chemical vapor reaction and chemical vapor deposition

机译：用于通过化学气相反应和化学气相沉积制备的碳/碳复合材料的抗氧化保护的双层纳米结构SiC涂层

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摘要

A double layer nanostructure SiC coating was prepared by chemical vapor reaction and chemical vapor deposition to protect carbon/ carbon composites from oxidation. The obtained dense coating reveals a typical crystalline structure and combines well with the substrate. The outer layer of the coating consists of SiC nanocrystals and nanowires, whereas the inner layer is mainly composed of SiC microcrystals, nanocrystals and nanowires. The oxidation and cyclic thermal shock lest performed at 1400 °C in air demonstrates that the prepared dense nanostructure coating has excellent anti-oxidation behavior and thermal shock resistance at high temperature. After 400 h oxidation and 34 cycles of thermal shock from 1400 °C to room temperature, the weight loss of the coated sample is only 1.67%. In the oxidation process, the amorphous silica formed at the beginning of the oxidation crystallizes to cristobalite as oxidation time increased. The formation of cristobalite resulted in micro-cracks formed along grain boundaries in the cyclic thermal shock test. As only cracks are formed on the coating surface, it can be concluded that the formation of the penetration cracks may be the reason for the weight loss of the SiC coated composite.
机译：通过化学气相反应和化学气相沉积制备双层纳米结构SiC涂层，以保护碳/碳复合材料免受氧化。所获得的致密涂层显示出典型的晶体结构，并与基材良好结合。涂层的外层由SiC纳米晶体和纳米线组成，而内层主要由SiC微晶体，纳米晶体和纳米线组成。至少在1400°C的空气中进行的氧化和循环热冲击试验表明，所制备的致密纳米结构涂层在高温下具有优异的抗氧化性能和耐热冲击性。经过400 h的氧化和从1400°C到室温的34次热冲击后，涂层样品的重量损失仅为1.67％。在氧化过程中，随着氧化时间的增加，在氧化开始时形成的无定形二氧化硅结晶为方石英。方石英的形成导致在循环热冲击试验中沿晶粒边界形成微裂纹。由于仅在涂层表面上形成裂纹，因此可以得出结论，穿透裂纹的形成可能是SiC涂层复合材料失重的原因。

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