SiC coating toughened by SiC nanowires to protect C/C composites against oxidation
SiC coating toughened by SiC nanowires to protect C/C composites against oxidation
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DOI：
10.1016/j.ceramint.2011.05.159
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发表时间：
2012
影响因子：
5.2
通讯作者：
Yanhui Chu;Q. Fu;Hejun Li;Heng Wu;Kezhi Li;Jun-Xi Tao;Q. Lei
中科院分区：
文献类型：
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作者：
Yanhui Chu;Q. Fu;Hejun Li;Heng Wu;Kezhi Li;Jun-Xi Tao;Q. Lei
采用两步法化学气相沉积（CVD）技术在C/C复合材料表面制备了SiC纳米线增韧的致密SiC涂层。用扫描电镜、透射电镜和X射线衍射仪对涂层的形貌和晶体结构进行了表征。SiC纳米线的加入减小了涂层裂纹的尺寸，提高了涂层的抗热震性。在1773 K ~室温范围内热震21次的结果表明，与未添加SiC纳米线的SiC涂层相比，添加SiC纳米线的SiC涂层裂纹平均尺寸由5±0.5μm减小到3±0.5μm。SiC纳米线的引入使SiC涂层C/C复合材料的失重率从9.32%降低到4.45%。
A dense SiC coating toughened by SiC nanowires was prepared on carbon/carbon (C/C) composites using a two-step technique of chemical vapor deposition (CVD) to protect them against oxidation. The morphologies and crystalline structures of the coatings were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. SiC nanowires played a role in decreasing the size of the cracks and improving the thermal shock resistance of the coating. The result of thermal shock between 1773K and room temperature for 21 times indicates that, compared with the SiC coating without SiC nanowires, the average size of the cracks in the SiC coating toughened with SiC nanowires reduced from 5±0.5 to 3±0.5μm. The weight loss of the SiC coated C/C composites decreased from 9.32 to 4.45% by the introduction of SiC nanowires.