论文标题
YTTERBIUM DISILATE环境屏障涂层的蒸汽降解：组成，微观结构和温度的影响
Steam Degradation of Ytterbium Disilicate Environmental Barrier Coatings: Effect of Composition, Microstructure and Temperature
论文作者
论文摘要
在包含蒸汽环境中的环境屏障涂料（EBC）的衰退是一个紧迫的关注点，需要进一步研究，然后才能实现燃气轮机发动机的实施。在这项工作中，在1350°C和1400°C下暴露于蒸汽中的自由式等离子体喷涂YB2SI2O7涂层96小时。研究了三个样品，一个样品具有低孔隙率水平（<3％）和1 wt。％Al2O3代表传统EBC；和两种孔隙率较高的涂层（约20％），代表可浸润的EBC。研究了相组成和微结构进化，以揭示高温蒸汽与diilate ytterbium dialate之间相互作用的潜在机制。结果表明，由于与来自氧化铝炉管的气态杂质的反应，YB2SIO5在表面附近的YB2SIO5和Ytterbium石榴石（YB3AL5O12）的形成。与可覆盖的样品相比，在1400°C的EBC样品中添加了1 wt。％Al2O3在1400°C下的形成加剧了石榴石的形成，而磨料的样品的含量较低。另外，暴露后可见切割间边界，表明通过SPLAT边界对气态杂质的杂质排入
Recession of environmental barrier coatings (EBC) in environments containing steam is a pressing concern that requires further research before their implementation in gas turbine engines can be realized. In this work, free-standing plasma sprayed Yb2Si2O7 coatings were exposed to flowing steam at 1350 °C and 1400 °C for 96 h. Three samples were investigated, one coating with a low porosity level (< 3 %) and 1 wt.% Al2O3 representing traditional EBCs; and two coatings with higher porosity levels (~20 %) representing abradable EBCs. Phase composition and microstructural evolution were studied in order to reveal the underlying mechanism for the interaction between high temperature steam and ytterbium disilicate. The results show depletion of Yb2SiO5 near the surface and formation of ytterbium garnet (Yb3Al5O12) on top of all three coatings due to the reaction with gaseous Al-containing impurities coming from the alumina furnace tubes. The 1 wt.% Al2O3 added to the EBC sample exacerbated the formation of garnet at 1400 °C compared to the abradable samples, which presented lower quantities of garnet. Additionally, inter-splat boundaries were visible after exposure, indicating preferential ingress of gaseous Al-containing impurities through the splat boundaries
