C/C复合材料SiC-Mo(Si, Al)_(2)涂层结构和抗氧化性能研究  

Investigation of the microstructure and high temperature anti-oxidation property of SiC-Mo(Si,Al)_(2) multi-coating for carbon/carbon composites

作　　者：侯党社[1,2] 李克智 HOU Dang-she;LI Ke-zhi(Research Institute of Energy and Chemical Industry,Xianyang Vocational Technical College,Xianyang 712046,China;Shaanxi Province C/C Composites Technology Research Center,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]咸阳职业技术学院能源化工研究所,咸阳712046 [2]西北工业大学碳/碳复合材料工程技术研究中心,西安710072

出　　处：《复合材料科学与工程》2021年第8期91-94,共4页Composites Science and Engineering

基　　金：国家自然科学基金(51472202)。

摘　　要：采用高温原位反应法在C/C复合材料表面制备了SiC-Mo(Si,Al)_(2)防氧化复合涂层,用XRD、SEM测试表征了其物相组成和显微结构,对制备粉料中铝硅含量对涂层微观结构和抗氧化能力的影响进行了研究,分析了涂层失效原因。研究结果表明:添加Al粉使涂层制备过程粉料浸渗能力增强;Al、Si原子比为1∶10时所得到的复合涂层主要有Mo(Si,Al)_(2)、MoSi_(2)、SiC和游离Si等物相,具有较大的厚度和致密的结构,体现出良好的抗氧化性能。随着氧化的进行,SiO_(2)玻璃层出现的孔洞加速了涂层材料损耗,导致涂层中出现贯穿性裂纹,是涂层失效的主要原因。A SiC-Mo(Si,Al)_(2) oxidation protective coating on carbon/carbon composites was prepared by high temperature in-situ reaction.Effects of the content of Al and Si on the microstructure and high temperature anti-oxidation property of the multi-coating were studied by XRD,SEM and isothermal oxidation test,and the failure reason of the coating at high temperature was analyzed.The results showed that the addition of Al enhanced the infiltration capacity of the embedded powder.When the molar ratio of Al/Si was 1∶10,the coating was composed of mainly Mo(Si,Al)_(2),MoSi_(2),SiC and Si,and it was thick and dense,giving good oxidation protective ability.The holes were formed in the SiO_(2) glass layer during oxidation,resulting in the quick consumption of the coating materials and the formation of the penetration cracks in the coating,which was the main reason for the failure of the coating.

关 键 词：C/C复合材料 涂层 防氧化 失效分析 

分 类 号：TB332[一般工业技术—材料科学与工程]