Evaluation of microhardness, fracture toughness and residual stress in a thermal barrier coating system: A modified Vickers indentation technique
Evaluation of microhardness, fracture toughness and residual stress in a thermal barrier coating system: A modified Vickers indentation technique
复制标题
热障涂层系统中显微硬度、断裂韧性和残余应力的评估：改进的维氏压痕技术
DOI：
10.1016/j.surfcoat.2012.02.060
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发表时间：
2012-07-15
影响因子：
5.4
通讯作者：
Lu, C.
中科院分区：
文献类型：
--
作者：
Mao, W. G.;Wan, J.;Lu, C.
采用改进的维氏压痕仪，结合3种压痕模型，研究了空气等离子喷涂热障涂层系统在热循环下的显微硬度、断裂韧性和残余应力的变化规律。结果表明，热循环后涂层表面的断裂韧性在0.64~3.67MPa m（1/2）之间变化，相应的压痕区残余应力在-36.8~-243MPa之间变化。在涂层与粘结层的界面区，涂层的断裂韧性在0.11~0.81MPa m（1/2）之间，残余应力在-5~-30MPa之间，与已有的实验数据一致。涂层侧向区域由于其特殊的层状结构，断裂韧性和残余应力沿厚度方向沿着呈现较强的梯度特征。皇冠版权所有（C）2012由Elsevier B.V.出版。保留所有权利。
The evolution of microhardness, fracture toughness and residual stress of an air plasma-sprayed thermal barrier coating system under thermal cycles was investigated by a modified Vickers indentation instrument coupled with three kinds of indentation models. The results show that fracture toughness on the top coating surface after thermal cycles changes from 0.64 to 3.67 MPa m(1/2), and the corresponding residual stress near the indented region varies from -36.8 to -243 MPa. For the interface region of coating and bond coat, fracture toughness in the coating close to interface ranges from 0.11 to 0.81 MPa m(1/2), and residual stress varies from -5 to -30 MPa, which are consistent with available data. For the lateral region of coating, fracture toughness and residual stress display strong gradient characteristics along the thickness direction due to the special layered structure. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.