以CH3SiCl3-H2体系在1000~1300℃沉积了SiC涂层,研究了温度对涂层沉积速率的影响,应用自发形核理论解释了不同沉积温度下CVD SiC涂层的组织结构.结果表明,随着沉积温度的提高,CVD SiC涂层的沉积速率相应增大;1000~1200℃沉积过程为化学动力学控制过程, 1200~1300℃沉积过程为质量转移控制,1000℃和1100℃沉积的SiC涂层表面光滑、致密;1200℃和1300℃沉积的SiC涂层表面粗糙、多孔; 随着沉积温度的提高,CVD SiC涂层的晶体结构趋于完整,当温度超过1150℃时,涂层中除β-SiC外还出现了少量α-SiC.
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