本文采用热CVD 方法,在ZrB_2-SiC 复合陶瓷基体上制备CVD·SiC-C 梯度涂层。采用XRD,SEM,及X 射线应力分析方法,研究了CVD·SiC-C 梯度涂层的相组成、显微结构、残余应力及弯曲强度等性能。结果表明,CVD·SiC-C 梯度涂层可以缓解SiC 与ZrB_2基体间的热应力及界面应力,涂层中的残余应力得到明显缓解;高温退火处理对CVD·SiC-C 涂层中的残余应力亦有缓解作用;梯度涂层显著改善了基材的弯曲强度。
SiC-C gradient coatings were prepared by using thermal Chemical VapourDeposition (CVD) method.The residual stress,microstructure and composition of the gra-dient coatings were inerstigted.It can be indicated that thermal stress and interface stressbetween
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