Effect of High Toughness Transition Layer on the Performance of Atmospheric Plasma Sprayed Thermal Barrier Coatings

被引：0

作者：

Liang L. ^{[1
]}

Huang W. ^{[1
]}

Wang S. ^{[1
]}

He Q. ^{[1
]}

机构：

[1] Surface Engineering Research Institute, Chinese Academy of Agricultural Mechanization Sciences, Beijing

来源：

Zhongguo Biaomian Gongcheng/China Surface Engineering | 2022年 / 35卷 / 06期

关键词：

composite structure; gas thermal shock; high toughness transition layer; thermal barrier coatings;

D O I：

10.11933/j.issn.1007-9289.20220324001

中图分类号：

学科分类号：

摘要：

Ceramic coatings near the bond coating / top coating interface in nano-structured thermal barrier coatings deposited by atmospheric plasma spray (APS) tend to initiate horizontal cracks under high temperature environment, and thus lead to the failure of thermal barrier coatings. High toughness transition layers of 8YSZ are deposited by atmospheric plasma spray and supersonic atmospheric plasma spray (SAPS). The results show that high toughness transition layers prepared by APS and SAPS improve the adhesion of flattened splats and increase density of transition layer. Compared with conventional nano-structured 8YSZ coatings, the toughness increases by 46% and 84%, respectively. High toughness transition layers increase the adhesive strength, thermal shock resistance and gas thermal shock resistance of composite structured thermal barrier coatings. The coatings show the best thermal shock resistance when the thickness of high toughness transition layer is 30～50 μm and deposited by SAPS. Moreover, compared with conventional nano-structured coatings, the gas thermal shock resistance increases by 120% when the thickness of high toughness transition layer is 10～30 μm. Testing under temperature gradient, the final failure of thermal barrier coatings changes from peeling off layer by layer in top coatings to spalling at the interface between top coating / bond coating. Through the design of high toughness transition layers, the adhesive strength and service life of thermal barrier coatings is improved and its thermal insulation performance is also considered. © 2022 Chinese Mechanical Engineering Society. All rights reserved.

引用

页码：197 / 205

页数：8

共 25 条

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