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Dynamic interactions of ingested molten silicate particles with air plasma sprayed thermal barrier coatings
Journal of Materials Research ( IF 2.7 ) Pub Date : 2020-08-10 , DOI: 10.1557/jmr.2020.196
Edward J. Gildersleeve , Sanjay Sampath

Air plasma sprayed thermal barrier coatings (TBCs) are used extensively throughout the gas turbine industry for both power and propulsion. As these engines push to higher temperatures, concern for failure from the melt infiltration of ingested siliceous debris [commonly called calcium–magnesium–alumino-silicate (CMAS)] arises, especially in aeroengines. 7 wt% yttria-stabilized zirconia is particularly prone to melt infiltration and stiffening-induced premature failure. Novel TBC materials such as gadolinium zirconate have been introduced for their infiltration-inhibiting CMAS reactions. Past academic work has utilized ideal laboratory furnace environments to study these phenomena. In this work, the influence of TBC microstructure and chemistry on impinging molten CMAS injected via a burner rig is studied. An observational study of the impacted surfaces and location-specific cross-sectional analysis is reported. Results point toward the critical role of surface microstructure on the mobility and reactivity of the molten CMAS.



中文翻译:

摄入的熔融硅酸盐颗粒与空气等离子喷涂热障涂层的动态相互作用

空气等离子喷涂的热障涂层(TBC)在整个燃气轮机行业中广泛用于动力和推进力。随着这些发动机的温度升高,人们对摄入的硅质碎屑(通常称为钙镁铝硅酸盐(CMAS))的熔体渗入引起的故障表示担忧,尤其是在航空发动机中。7 wt%的氧化钇稳定的氧化锆特别容易发生熔体渗透和硬化引起的过早破坏。新型的TBC材料,例如锆酸have已被引入,以抑制其渗透作用。过去的学术工作已经利用理想的实验室熔炉环境来研究这些现象。在这项工作中,TBC的微观结构和化学性质对撞击通过CMCA注入的熔融CMAS的影响研究了燃烧器装置。报告了对受影响表面的观察性研究和针对特定位置的横截面分析。结果表明,表面微观结构对熔融CMAS的迁移率和反应性至关重要。

更新日期:2020-09-14
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