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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

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  • (西北有色金属研究院, 陕西 西安 710016)
杨 涛(1987-),高级工程师,现主要从事难熔金属高温抗氧化涂层研究,电话:13991375224,E-mail:qtxy 888@163.com

收稿日期: 2023-03-24

  修回日期: 2023-04-12

  录用日期: 2023-05-20

  网络出版日期: 2023-09-15

基金资助

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

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

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  • (Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China)

Received date: 2023-03-24

  Revised date: 2023-04-12

  Accepted date: 2023-05-20

  Online published: 2023-09-15

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(1 350,1 400,1 450,1 500 ℃),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)Si2(X 为Zr、Cr 和Ti),过渡层为稳定的Nb5Si3;涂层在1 600 ℃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,ZrO2作为“氧化物钉”弥散在SiO2玻璃膜中,涂层展现出良好的抗高温氧化性能。 熔烧温度为1 350 ℃样品的抗高温氧化性能最优。

本文引用格式

杨涛, 汪欣, 王振宇, 李晴宇 . 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[J]. 材料保护, 2023 , 56(9) : 54 -62 . DOI: 10.16577/j.issn.1001-1560.2023.0212

Abstract

Silicide coatings are the most commonly used high-temperature protective coating for niobium alloy high-temperature structural components used in aerospace and aviation.In order to improve the performance of silicide coating and meet the increasingly stringent service conditions of niobium alloy high-temperature structural components, silicide coatings were prepared on the surface of NbW alloy by slurry fusion sintering method.By changing the sintering temperature of the coating (1 350,1 400,1 450,1 500 ℃), 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) Si2(X was Zr, Cr and Ti), and the transition layer was stable Nb5Si3.The coating was oxidized at a high temperature of 1 600 ℃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.ZrO2 was dispersed in the SiO2 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 1 350 ℃was the best.

参考文献

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