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首页> 外文期刊>Surface & Coatings Technology >Thermal behavior and mechanical properties of Y2SiO5 environmental barrier coatings after isothermal heat treatment
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Thermal behavior and mechanical properties of Y2SiO5 environmental barrier coatings after isothermal heat treatment

机译：等温热处理后Y2SiO5环保涂层的热行为和力学性能

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Y2SiO5 coatings are deposited by a flame-spray technique as protection layer on SiC substrates to prevent oxidation and steam corrosion. In this research, Y2SiO5 coatings were isothermally heat treated at different temperatures and different exposure times in a laboratory environment. The thermal behaviors such as phase transformation, microstructural change and thermally grown oxide (TGO) formation have been examined by XRD, SEM, and EDS analysis. Different modes of TGO growth behavior were found at different temperatures. In addition, the mechanical properties were evaluated by a Martens hardness tester. The results show that the change of microstructure and composition is not too critical, but higher temperatures and longer heating times do lead to the formation of Y2SiO5 crystalline phases and a beta-Y2O3 phase. Thus, the isothermal heat treatment improves the hardness and elastic modulus of Y2SiO5 coatings. (C) 2016 Elsevier B.V. All rights reserved.
机译：Y2SiO5涂层通过火焰喷涂技术作为保护层沉积在SiC衬底上，以防止氧化和蒸汽腐蚀。在这项研究中，Y2SiO5涂层在实验室环境中以不同的温度和不同的暴露时间进行了等温热处理。通过XRD，SEM和EDS分析检查了相变，微结构变化和热生长氧化物（TGO）形成等热行为。在不同温度下发现了不同模式的TGO生长行为。另外，用马氏硬度计评价机械性能。结果表明，微观结构和组成的变化不是很关键，但是较高的温度和较长的加热时间确实会导致形成Y2SiO5晶相和β-Y2O3相。因此，等温热处理提高了Y2SiO5涂层的硬度和弹性模量。 （C）2016 Elsevier B.V.保留所有权利。

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