带有SiC涂层的C/C复合材料的氧化行为

采用包埋法在C/C复合材料表面制备了SiC高温防氧化涂层。利用SEM和XRD等方法对涂层的微观形貌和晶相组成进行了观察与分析,并对带涂层试样在室温~1 500℃范围内的氧化行为进行了研究。结果表明,涂层主要由β-SiC和少量的游离Si组成,涂层表面有裂纹存在,涂层与C/C复合材料基体结合良好,呈现犬牙状结合。在室温~1 500℃之间,带SiC涂层C/C复合材料的氧化行为可分为4个阶段,涂层在高温区具有较好的防氧化性能。

Oxidation behavior of C/C composites with SiC coating

An anti-oxidation SiC coating prepared with pack cementation process was applied to protect C/C composites from oxidation at high temperature. The microstructure and composition of SiC coating was analyzed with SEM and XRD. The oxidation behavior of the composites with SiC coating from room temperature to 1 500 ℃ was investigated. The results show that the as-re-ceived coating is mainly composed of β-SiC with a little of Si and there exist a few microcracks on the coating surface. Further ob-servation reveals that the SiC coating is perfectly packed on the C/C composites with interlocked bonding. The oxidation behavior of the coated C/C composites can be divided into four parts from room temperature to 1 500 β, and the coating shows excellent oxida-tion resistances at high temperature.