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Stability Loss and Delamination of a Thermal Barrier Coating from the Substrate under Heat Loads
Physical Mesomechanics ( IF 1.6 ) Pub Date : 2021-06-17 , DOI: 10.1134/s102995992103005x
P. A. Lyukshin , B. A. Lyukshin , N. Yu. Matolygina , S. V. Panin

Abstract

The paper proposes a simple two-layer model to assess the behavior of a heat-loaded thermal barrier coating–substrate system with neglect of thermally grown oxide and bond coat. The model includes solutions of boundary value problems of thermal conduction, thermoelasticity, stability, and stress-strain state after stability loss, and it also provides for coating delamination from the substrate after stability loss. It is shown that when the coating–substrate system is exposed to intense heat, the coating experiences compressive stresses which can cause a loss of its stability. When the coating losses its stability on the elastic substrate, chess-board extrusion and intrusion regions with respective tensile and compressive zones arise in the system. At a critical stress intensity, the system losses its continuity at the coating–substrate interface, and the coating delaminates from the substrate in tensile zones. The zones of delamination at the coating–substrate interface are arranged periodically.



中文翻译:

热负荷下热障涂层从基材上的稳定性损失和分层

摘要

该论文提出了一个简单的两层模型来评估热负载热障涂层 - 基材系统的行为,而忽略了热生长的氧化物和粘合涂层。该模型包括热传导、热弹性、稳定性和稳定性损失后应力应变状态的边值问题的解,还提供了稳定性损失后涂层与基体的分层问题。结果表明,当涂层 - 基材系统暴露在高温下时,涂层会受到压应力,这会导致其稳定性丧失。当涂层在弹性基材上失去稳定性时,系统中会出现具有各自拉伸和压缩区域的棋盘挤压和侵入区域。在临界应力强度下,系统在涂层-基材界面失去连续性,并且涂层在拉伸区从基材上分层。涂层-基材界面处的分层区域是周期性排列的。

更新日期:2021-06-17
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