Thermomechanical Properties of Bilayer La2Zr2O7 Thermal Barrier Coatings
Thermomechanical Properties of Bilayer La2Zr2O7 Thermal Barrier Coatings
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双层La2Zr2O7热障涂层的热机械性能
DOI：
10.1007/978-3-319-48182-1_18
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Jing Zhang
中科院分区：
文献类型：
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作者：
Xingye Guo;Zhe Lu;Yeon‐Gil Jung;Li Li;J. Knapp;Jing Zhang
La2Zr2O7由于其低热导率和优异的高温稳定性而成为一种很有前途的热障涂层材料。在这项工作中，使用等离子喷涂技术沉积了双层 La2Zr2O7 和传统的 8 wt% 氧化钇稳定氧化锆 (8YSZ) 涂层。设计了单层La2Zr2O7和双层8YSZ/La2Zr2O7涂层结构。热循环和热冲击测试用于评估涂层的热机械性能。所有 La2Zr2O7 涂层在炉循环测试中均在不到 20 个循环的时间内分层。这是因为残余热应力在热循环过程中累积。在喷气发动机热冲击（JETS）测试中，SCL La2Zr2O7和DCL致密8YSZ/La2Zr2O7涂层完全分层。相比之下，DCL 多孔 8YSZ/La2Zr2O7 涂层样品仅在边缘部分分层。这是因为多孔 8YSZ 层提供了应变顺应性。这些发现将有助于提出有效的热障涂层系统。
La2Zr2O7is a promising thermal barrier coating material due to its low thermal conductivity and superior high temperature stability. In this work, Bilayer La2Zr2O7and conventional 8 wt% yttria stabilized zirconia (8YSZ) coatings were deposited using plasma spray technique. Both single‐layer La2Zr2O7and double‐layer 8YSZ/La2Zr2O7coating architectures were designed. Thermal cycling and thermal shock tests were used to evaluate coatings' thermomechanical properties. All La2Zr2O7coats were delaminated in the furnace cycle test in less than 20 cycles. This is because residual thermal stresses accumulated during thermal cycling. In the jet engine thermal shock (JETS) tests, the SCL La2Zr2O7and DCL dense 8YSZ/La2Zr2O7coatings were fully delaminated. In contrast, the DCL porous 8YSZ/La2Zr2O7coating sample only partially delaminated on the edge. This is because of the porous 8YSZ layer provides strain compliance. The findings will help to propose efficient thermal barrier coating systems.