LaFeO3/8YSZ复合涂层热物理参数测试及应力场分析

曹博然, 谭正澳, 何永香, 胡延浩, 许宇胜, 郭宏, 戴翠英, 周哲, 王杰, 黄文质, 李沙, 左劲旅, 毛卫国

doi:10.16577/j.issn.1001-1560.2024.0231

材料保护 >

2024 , Vol. 57 >Issue 10: 118 - 125

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0231

工艺篇

LaFeO₃/8YSZ复合涂层热物理参数测试及应力场分析

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¹长沙理工大学材料科学与工程学院； ²高端装备先进涂层技术湖南省重点实验室； ³北方导航控制技术股份有限公司； ⁴国防科技大学空天科学学院； ⁵湖南博云新材料股份有限公司

毛卫国(1979-)，博士，教授，研究方向为先进涂层技术及性能评价，电话:13975247328，E-mail: ssamao＠126.com

收稿日期: 2024-02-04

修回日期: 2024-03-23

录用日期: 2024-03-24

网络出版日期: 2024-12-22

基金资助

国家科技重大专项(J2019-VI-0017-0132，J2022-VI-0008-0039)；国家重点研发计划(2021YFB3702304-4)；博云新材航天用先进碳基耐烧蚀材料领域创新团队项目

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Thermophysical Parameter Measurements and Stress Analysis of LaFeO₃/8YSZ Double-Layer Coatings

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(1.School of Materials Science and Engineering， Changsha University of Science ＆ Technology， Changsha 410014， China；2.Hunan Provincial Key Laboratory of Advanced Coating Technology for High-End Equipment， Changsha 410014， China；3.North Navigation Control Technology Co.， Ltd.， Beijing 100176， China；4.College of Aerospace Science and Engineering， National University of Defense Technology， Changsha 410073， China；5.Hunan BOYUN New Materials Co.， Ltd.， Changsha 410205， China)

MAO Weiguo (1979-)， Ph.D.， Professor， Research Focus: Advanced Coating Technologies and Performance Evaluation Methods， Tel.: 13975247328， E-mail: ssamao＠126.com

Received date: 2024-02-04

Revised date: 2024-03-23

Accepted date: 2024-03-24

Online published: 2024-12-22

Supported by

National Science and Technology Major Projects (J2019-VI-0017-0132， J2022-VI-0008-0039)； National Key R＆D Program (2021YFB3702304-4)； Innovative Team Project of Advanced Carbon-Based Ablative Materials for Aerospace by Boyun New Materials Co.， Ltd.

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摘要

大气等离子喷涂工艺制备的热障隐身一体化涂层材料在航空发动机热端部件上有着重要的应用前景。针对LaFeO3/8YSZ 复合涂层大气等离子喷涂工艺参数优化问题，首先制备了纯LaFeO3涂层，并完成了1 150 ℃下涂层热物理参数高温表征；建立了LaFeO3/8YSZ 复合涂层有限元模型，重点分析了制备温度和涂层厚度比对样品残余应力的影响。结果表明:随着制备温度的升高，LaFeO3和8YSZ 涂层的面内压应力逐渐增大；LaFeO3涂层面内应力从150 ℃时的-96 MPa 变化到250 ℃时的-152 MPa，类似地，8YSZ 涂层面内应力从-48 MPa 增大到-86 MPa；压应力状态有利于延长涂层在高温服役环境下的使用寿命。由于LaFeO3的热膨胀系数与8YSZ 接近，在给定涂层总厚度为1.0 mm 的条件下，LaFeO3/8YSZ 厚度比的变化对双层涂层的残余应力的影响不大。

关键词： LaFeO₃/8YSZ 复合涂层; 制备温度; 涂层厚度比; 应力分布

本文引用格式

曹博然, 谭正澳, 何永香, 胡延浩, 许宇胜, 郭宏, 戴翠英, 周哲, 王杰, 黄文质, 李沙, 左劲旅, 毛卫国 . LaFeO₃/8YSZ复合涂层热物理参数测试及应力场分析[J]. 材料保护, 2024 , 57(10) : 118 -125 . DOI: 10.16577/j.issn.1001-1560.2024.0231

Abstract

The thermal barrier stealth integrated coating material prepared by atmospheric plasma spraying process has important application prospects in the hot end components of aircraft engines.For studying the optimization of atmospheric plasma spraying process parameters for LaFeO3/8YSZ composite coating， a pure LaFeO3 coating was first prepared， and high-temperature characterization of the thermal and physical parameters of the coating was completed at 1 150 ℃.A finite element model of LaFeO3/8YSZ composite coating was established，and the influence of preparation temperature and coating thickness ratio on residual stress of the sample was analyzed in detail.Results showed that as the preparation temperature increased， the in-plane compressive stress of LaFeO3 and 8YSZ coatings gradually increased.The surface internal stress of LaFeO3 coating changed from -96 MPa at 150 ℃to -152 MPa at 250 ℃， and similarly， the surface internal stress of 8YSZ coating increased from -48 MPa to -86 MPa.Besides，the compressive stress state was beneficial for extending the service life of coatings in high-temperature service environments.Due to the thermal expansion coefficient of LaFeO3 being close to that of 8YSZ， the change in the thickness ratio of LaFeO3/8YSZ had little effect on the residual stress distribution of the double-layer coatings at a given total coating thickness of 1.0 mm.

Key words： LaFeO₃/8YSZ double coatings; preparation temperature; coating thickness ratios; stress distribution

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