熔烧温度对铌钨合金表面硅化物涂层显微组织和抗高温氧化性能的影响研究  

Effect of Sintering Temperature on the Microstructure and High Temperature Oxidation Resistance of Silicide Coating on Surface of NbW Alloy

作　　者：杨涛[1] 汪欣[1] 王振宇[1] 李晴宇[1] YANG Tao;WANG Xin;WANG Zhenyu;LI Qingyu(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《材料保护》2023年第9期54-62,共9页Materials Protection

基　　金：陕西省自然科学基础研究计划一般项目(2020JM-647);国家自然科学基金(52071274);陕西省重点研发计划(2023-YBGY-442)资助。

摘　　要：硅化物涂层是航天航空用铌合金高温结构部件最常用的高温防护涂层,为了提高硅化物涂层的性能以满足铌合金高温结构部件越来越严苛的服役条件,采用料浆熔烧法在铌钨合金表面制备硅化物涂层,并通过改变涂层熔烧温度(1350,1400,1450,1500℃),研究熔烧温度对涂层微观结构和抗高温氧化性能的影响。结果表明:4种熔烧温度涂层致密层的主成分为(Nb,X)Si_(2)(X为Zr、Cr和Ti),过渡层为稳定的Nb_(5)Si_(3);涂层在1600℃高温下氧化2 h,氧化反应主要发生在表面的疏松层,Si、Zr、Ti、Cr等元素发生了选择性氧化,ZrO_(2)作为“氧化物钉”弥散在SiO_(2)玻璃膜中,涂层展现出良好的抗高温氧化性能。熔烧温度为1350℃样品的抗高温氧化性能最优。Silicide coatings are the most commonly used high-temperature protective coating for niobium alloy high-temperature structural com-ponents used in aerospace and aviation.In order to improve the performance of silicide coating and meet the increasingly stringent service condi-tions of niobium alloy high-temperature structural components,silicide coatings were prepared on the surface of NbW alloy by slurry fusion sin-tering method.By changing the sintering temperature of the coating(1350,1400,1450,1500℃),the effect of sintering temperature on the microstructure and high-temperature oxidation resistance of the coating was studied.Results showed that the main components of the dense layer of the 4 kinds of sintering temperature coating were(Nb,X)Si_(2)(X was Zr,Cr and Ti),and the transition layer was stable Nb_(5)Si_(3).The coating was oxidized at a high temperature of 1600℃for 2 h,the oxidation reaction mainly occurred in the loose layer on the surface,and the elements such as Si,Zr,Ti,Cr were selectively oxidized.ZrO_(2) was dispersed in the SiO_(2) glass film as"oxide nails",and the coating exhibited good high temperature oxidation resistance.The high temperature oxidation resistance of the coating at the sintering temperature of 1350℃was the best.

关 键 词：铌钨合金 硅化物涂层 熔烧温度 微观结构 抗高温氧化性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]