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

CAO Boran, TAN Zheng'ao, HE Yongxiang, HU Yanhao, XU Yusheng, GUO Hong, DAI Cuiying, ZHOU Zhe, WANG Jie, HUANG Wenzhi, LI Sha, ZUO Jinglu, MAO Weiguo

doi:10.16577/j.issn.1001-1560.2024.0231

Materials Protection >

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

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

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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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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CAO Boran, TAN Zheng'ao, HE Yongxiang, HU Yanhao, XU Yusheng, GUO Hong, DAI Cuiying, ZHOU Zhe, WANG Jie, HUANG Wenzhi, LI Sha, ZUO Jinglu, MAO Weiguo . Thermophysical Parameter Measurements and Stress Analysis of LaFeO₃/8YSZ Double-Layer Coatings[J]. Materials Protection, 2024 , 57(10) : 118 -125 . DOI: 10.16577/j.issn.1001-1560.2024.0231

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