C/C复合材料难熔金属二硅化物涂层防氧化机理研究  

Study on antioxidant mechanism of refractory metallic disilicide coating for carbon/carbon composites

作　　者：侯党社[1] 李克智[2] 李贺军[2] 付前刚[2] 

机构地区：[1]咸阳职业技术学院,咸阳712000 [2]西北工业大学超高温结构复合材料国防科技重点实验室,西安710072

出　　处：《固体火箭技术》2010年第2期218-221,共4页Journal of Solid Rocket Technology

基　　金：国家"973"资助项目(2006CB600908)

摘　　要：采用包埋技术在C/C复合材料表面制备了SiC-WSi2/MoSi2抗氧化涂层,通过恒温氧化试验以及TG-DTG、XRD和SEM等手段对该涂层的显微形貌、成分进行了分析,研究了涂层在1 500℃的抗氧化机理。结果表明,二硅化物的合金化及二硅化物与SiC的复合化提高了涂层的致密性、稳定性,而涂层表面长时间存在的致密的玻璃态SiO2,有效地阻止了氧气向涂层内部的扩散,使涂层表现出优异的高温防氧化能力。A SiC-WSi2/MoSi2 multilayer oxidation protective coating for carbon/carbon（C/C） composites was prepared by using pack cementation process.By SEM,XRD,TG-DTG and isothermal oxidation test,the microstructure and phase component of the coating were analyzed,and anti-oxidation mechanism of the coating at 1 500 ℃ were studied and explained.The results show that the compactness and stability of the coating is improved comprehensively by alloying and compounding coating materials,and a dense SiO2 film is formed on the surface of the coating during oxidation effectively to prevent the diffusion of oxygen into the coating,which makes the coating possess excellent oxidation protective ability.

关 键 词：C/C复合材料 涂层 二硅化物 防氧化机理 

分 类 号：TB332[一般工业技术—材料科学与工程]