Measurements and understanding of the stiffness of an air plasma sprayed thermal barrier coating
Measurements and understanding of the stiffness of an air plasma sprayed thermal barrier coating
复制标题
空气等离子喷涂热障涂层刚度的测量和理解
DOI：
10.1016/j.surfcoat.2020.125678
复制
发表时间：
2020
影响因子：
5.4
通讯作者：
P. Xiao
中科院分区：
文献类型：
--
作者：
Ying Chen;Chun Li;Xiaofeng Zhao;P. Xiao
采用三点弯曲技术对空气等离子喷涂热障涂层的硬度进行了研究。在不同的时间段对酸蚀制备的分离TBC束进行了不同时间的测量，包括沉积状态和热处理后。通过单调加载和循环加载，详细了解了热障涂层的力学性能。TBC梁在弯曲过程中表现出非线性行为、弹塑性变形和滞回曲线。得到的整体面内弹性模数随热暴露的增加而先增大后减小，范围为14-18 Gpa。这种行为是烧结和微结构损伤发展之间竞争的结果。现场力学测试过程中的直接显微结构观察表明，板内开闭和板间滑动是导致APS热障涂层弹性模数较低的原因。
In this work, the stiffness of an air plasma sprayed thermal barrier coating (APS TBC) was studied using the three-point bending technique. Various measurements over different time periods were made on detached TBC beams, prepared by acid etching, in both as-deposited states and after heat treatment. Monotonic and cyclic loading were conducted to understand the mechanical behaviour of the TBCs in detail. The TBC beams during bending show nonlinear behaviour, inelastic deformation and hysteresis loops. The derived global in-plane elastic modulus, at first increases and then decreases with thermal exposure, and is of the range 14–18 GPa. This behaviour is a result of competition between sintering and development of microstructural damage. Direct microstructural observations during In-situ mechanical testing show that intra-splat opening/closure and inter-splat sliding give rise to the relatively low elastic modulus of the APS TBC.
影响因子：
9.4
作者：
Cocks, A. C. F.;Fleck, N. A.
通讯作者：
Fleck, N. A.