Mo元素的掺杂对Ta-10W合金用Si-Ti-Hf涂层高温抗氧化性能的影响  

Effect of Mo doping on high temperature oxidation resistance of Si-Ti-Hf coating for Ta-10W alloy

作　　者：盛晓晨 孟佳[2] 严彪[1] 乐军[2] SHENG Xiaochen;MENG Jia;YAN Biao;LE Jun(School of Materials Science and Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Inorganic Cotaing Materials,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China)

机构地区：[1]同济大学材料科学与工程学院,上海200092 [2]中国科学院上海硅酸盐研究所特种无机涂层重点实验室,上海201899

出　　处：《粉末冶金工业》2021年第5期33-39,共7页Powder Metallurgy Industry

摘　　要：本文为解决钽钨合金(Ta-10W)在500℃时出现"pest"氧化现象的问题,采用料浆熔烧法在钽钨合金(Ta-10W)表面制备高温抗氧化涂层,通过在Si-Ti-Hf料浆中掺杂Mo元素对涂层进行改性,调整了涂层的热膨胀系数,制备出更均匀致密平整的涂层。研究掺杂不同含量的Mo元素对涂层高温抗氧化性能的影响:Mo元素掺杂越多,涂层的热膨胀系数与基材越接近,涂层的微裂纹越少,抗氧化性能越优异;而与此同时,涂层中形成的MoSi_(2)含量也越高,氧化成气态的MoO_(3)含量也更多,不利于涂层的高温抗氧化性能;当掺杂2%Mo元素时,涂层的高温抗氧化性能最优并分析涂层的抗氧化及失效机理。In order to solve the problem of"pest"oxidation of tantalum tungsten alloy(Ta-10 W)at 500℃,a more uniform,dense and smooth coating was prepared on the surface of Ta-10 W alloy by fused slurry method through doping Mo element in Si-Ti-HF slurry,which could adjust the thermal expansion coefficient of the coating in this paper.The effect of different content Mo element on the high temperature oxidation resistance of the coating was studied.The more Mo element is doped,the closer the thermal expansion coefficient of the coating is with the substrate,the less microcracks and the better oxidation resistance is with the coating.At the same time,the higher the content of MoSi_(2)formed in the coating,the more MoO_(3)oxidized into gas,which is not conducive to the high temperature oxidation resistance of the coating.When 2%Mo is doped,the high temperature oxidation resistance of the coating is the best,and the oxidation resistance and failure mechanism of the coating are analyzed.

关 键 词：钽钨合金 Mo元素掺杂 高温抗氧化 硅化物涂层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]