Atmospheric plasma sprayed thick thermal barrier coatings: Microstructure, thermal shock behaviors and failure mechanism

热障涂层 材料科学 热冲击 微观结构 复合材料 涂层 开裂 热喷涂 陶瓷 休克(循环) 大气压等离子体 等离子体 量子力学 医学 物理 内科学
作者
Shiqian Tao,Jiasheng Yang,Fang Shao,Huayu Zhao,Xinghua Zhong,Yin Zhuang,Jing Sheng,Jinxing Ni,Qinghui Li,Shunyan Tao
出处
期刊:Engineering Failure Analysis [Elsevier BV]
卷期号:131: 105819-105819 被引量:37
标识
DOI:10.1016/j.engfailanal.2021.105819
摘要

Abstract Advanced thick thermal barrier coatings (TTBCs) have attracted extensive attentions due to the embedded segmentation-crack structure and excellent thermal insulation performance. The thermal shock life and failure behaviors of advanced TTBCs still remain a challenge. The objective of this work is to well understand the effect of microstructure on the coating cracking behavior in atmospheric plasma sprayed TTBCs system, in which the extended Raman spectroscopy (RS) techniques are used to obtain an in-depth understanding on how the oxidation affects the stress distribution in coatings and in turn, the causes of the observed cracking. Results show that the TTBCs deposited by the highly purified feedstock exhibit excellent thermal shock life at 1100 ℃ due to the well-proportioned and compact structure and built-in vertical cracks. After thermal shock test, the broken regions usually occur at the horizontal cracks and vertical cracks area within top-coat, and top-coat/bondcoat interface, which may suggest that each structural mutation parts are prone to causing the TTBCs instabilities. Cracks are propagated and extended under thermal tensile stress. The coating failure is most possibly dominated by the accumulated residual stress generated due to thermal expansion mismatch between the substrate and top-coat. In addition, the good thermal shock resistance have a close relationship with the newly formed vertical cracks at the bottom of ceramic coating near the top-coat/bondcoat interface.
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