Abstract Thermochemical interactions between a calcium-magnesium aluminosilicate (CMAS) glass and ytterbium disilicate (Yb2Si2O7), a candidate environmental barrier coating (EBC) material, have been investigated. Pellets of Yb2Si2O7 and CMAS glass powder were heat treated at 1200, 1300, 1400 and 1500 °C for 1, 10 and 50 h in air. Powder X-ray diffraction was employed to identify the resulting phases. In a second series of experiments, Yb2Si2O7 substrates were prepared by hot pressing, and cylindrical wells were drilled into the material surface. CMAS glass powder was added to the wells to achieve a loading of ~35 mg/cm2 and subsequently heat treated at 1200, 1300, 1400 and 1500 °C for durations of 1, 10 and 50 h in air. Sample cross-sections were characterized using scanning electron microscopy, X-ray energy-dispersive spectroscopy, X-ray diffraction, electron microprobe analysis and transmission electron microscopy to evaluate the resulting microstructure, phases and compositions at the CMAS/Yb2Si2O7 interface. Dissolution of ytterbium silicate into molten CMAS followed by precipitation of Yb2Si2O7 coupled with CMAS grain boundary penetration at elevated temperatures were the dominant mechanisms by which CMAS effectively infiltrated and altered the Yb2Si2O7 substrate microstructure.

中文翻译：

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钙镁铝硅酸盐 (CMAS) 在高温下与硅酸镱环境屏障涂层材料的相互作用

摘要 已经研究了钙镁铝硅酸盐 (CMAS) 玻璃和二硅酸镱 (Yb2Si2O7)（一种候选环境屏障涂层 (EBC) 材料）之间的热化学相互作用。Yb2Si2O7 和 CMAS 玻璃粉末的颗粒在空气中在 1200、1300、1400 和 1500°C 下热处理 1、10 和 50 小时。粉末X射线衍射用于鉴定所得相。在第二系列实验中，Yb2Si2O7 衬底通过热压制备，并在材料表面钻出圆柱形孔。将 CMAS 玻璃粉末添加到孔中以实现~35 mg/cm2 的负载，随后在空气中在 1200、1300、1400 和 1500 °C 下热处理 1、10 和 50 小时。样品横截面使用扫描电子显微镜、X 射线能量色散光谱、X 射线衍射、电子微探针分析和透射电子显微镜，以评估 CMAS/Yb2Si2O7 界面处的微观结构、相和成分。硅酸镱溶解到熔融的 CMAS 中，随后 Yb2Si2O7 的沉淀与 CMAS 晶界在升高的温度下渗透是 CMAS 有效渗透和改变 Yb2Si2O7 基底微观结构的主要机制。