SiC-MoSi_2/ZrO_2-MoSi_2 coating to protect C/C composites against oxidation  

C/C复合材料表面SiC-MoSi_2/ZrO_2-MoSi_2抗氧化涂层(英文)

作　　者：付前刚[1] 张佳平[1] 张正中[1] 李贺军[1] 孙粲[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,C/C复合材料工程技术研究中心,西安710072

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第7期2113-2117,共5页中国有色金属学报（英文版）

基　　金：Projects(51221001,51222207)supported by the National Natural Science Foundation of China;Project(090677)supported by the Program for New Century Excellent Talents in University of China;Project(B08040)supported by Program of Introducing Talents of Discipline to Universities,China

摘　　要：To improve the oxidation resistance of carbon/carbon （C/C） composites in air at high temperatures, a SiC- MoSi2/ZrO2-MoSi2 coating was prepared on the surface of C/C composites by pack cementation and slurry method. The microstructures and phase compositions of the coated C/C composites were analyzed by scanning electron microscopy and X-ray diffraction, respectively. The result shows that the SiC-MoSi2/ZrO2-MoSi2 coating is dense and crack-free with a thickness of 250-300 μm. The preparation and the high temperature oxidation property of the coated composites were investigated. The as-received coating has excellent oxidation protection ability and can protect C/C composites from oxidation for 260 h at 1773 K in air. The excellent anti-oxidation performance of the coating is considered to come from the formation of ZrSiO4, which improves the stability of the coating at high temperatures.为了提高C/C复合材料在高温空气中的抗氧化性能,采用包埋法和涂刷法在C/C复合材料表面制备MoSi2-SiC/ZrO2-MoSi2涂层。借助扫描电镜和X射线衍射等测试手段对涂层的微观形貌和相组成进行分析,同时研究涂层的制备过程和高温静态空气中的抗氧化性能。结果表明：SiC-MoSi2/ZrO2-MoSi2涂层致密且无穿透性裂纹,厚度为250~300μm,具有优异的抗氧化性能,在1773K静态空气中的有效抗氧化时间为260h,这主要是由于涂层中生成了ZrSiO4,有效提高了涂层的高温稳定性。

关 键 词：carbon/carbon composites SiC-MoSi2/ZrO2-MoSi2 COATING oxidation resistance 

分 类 号：TB332[一般工业技术—材料科学与工程] TB306