Thermal barrier coatings (TBCs) prolong the durability of gas turbine engine components and enable them to operate at high temperature. Several degradation mechanisms limit the durability of TBCs during their service. Since the atmospheric plasma spray (APS) processed 7–8 wt.% yttria stabilized zirconia (YSZ) TBCs widely utilized for gas turbine applications are susceptible to erosion damage, this work aims to evaluate the influence of their porosity levels on erosion behavior. Eight different APS TBCs were produced from 3 different spray powders with porosity ranging from 14% to 24%. The as-deposited TBCs were examined by SEM analysis. A licensed software was used to quantify the different microstructural features. Mechanical properties of the as-deposited TBCs were evaluated using micro-indentation technique. The as-deposited TBCs were subjected to erosion tests at different angles of erodent impact and their erosion performance was evaluated. Based on the results, microstructure-mechanical property-erosion performance was correlated. Findings from this work provide new insights into the microstructural features desired for improved erosion performance of APS deposited YSZ TBCs.

中文翻译：

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孔隙度不同的等离子大气喷涂热障涂层的冲蚀性能

隔热涂层（TBC）延长了燃气涡轮发动机组件的使用寿命，并使它们能够在高温下运行。几种降解机制会限制TBC在其使用期间的耐久性。由于广泛用于燃气轮机的常压等离子体喷雾（APS）处理的7-8 wt％的氧化钇稳定氧化锆（YSZ）TBC易受腐蚀破坏，因此本研究旨在评估其孔隙度对腐蚀行为的影响。由3种不同的喷粉生产了8种不同的APS TBC，其孔隙率范围为14％至24％。通过SEM分析检查沉积的TBC。使用许可的软件来量化不同的微观结构特征。使用微压痕技术评估了沉积的TBC的机械性能。沉积的TBC在不同角度的腐蚀作用下进行腐蚀测试，并评估其腐蚀性能。根据结果​​，将微观结构-机械性能-腐蚀性能关联起来。这项工作的发现为改善APS沉积YSZ TBC的腐蚀性能所需的微观结构特征提供了新见解。