Phase equilibria in ZrO₂-YO_1.5-SiO₂ (ZYS) and ZrO₂-GdO_1.5-SiO₂ (ZGS) were experimentally assessed at 1400 °C and 1600 °C as they can offer insight on reactions between thermal barrier coatings (TBCs) based on ZrO₂-YO_1.5/GdO_1.5 and molten silicate deposits in gas turbine engines. Features shared in both systems include the absence of ternary compounds and no ternary solubility in the binary phases. In ZYS however, a quaternary invariant reaction was observed that eliminates the zircon-disilicate equilibrium at higher temperatures. The results suggest no appreciable difference in the reactions between silica and thermal barrier oxides based on ZrO₂-YO_1.5 or ZrO₂-GdO_1.5, or environmental barrier coatings based on the corresponding Y/Gd silicates. The phase diagrams derived from these experiments are part of a broader effort to develop thermodynamic databases that can help guide the design of next-generation TBCs.

以ZrO相平衡₂ -yo _1.5 -SiO ₂（ZYS）和ZrO ₂ -GdO _1.5 -SiO ₂（ZGS）在1400℃下和1600℃进行了实验评估，因为他们可以在热障涂层之间的反应提供的见解（热障涂层）基于ZrO ₂ -YO _1.5 / GdO _1.5以及燃气轮机中熔融的硅酸盐沉积物。两个系统共有的功能包括在二元相中不存在三元化合物和三元溶解度。然而，在ZYS中，观察到四元不变反应，消除了较高温度下的锆石-二硅酸盐平衡。结果表明，二氧化硅与基于ZrO ₂ -YO _1.5或ZrO ₂ -GdO _1.5的热障氧化物或基于相应Y / Gd硅酸盐的环境屏障涂层之间的反应没有明显差异。从这些实验中得出的相图是开发热力学数据库的更广泛努力的一部分，该热力学数据库可帮助指导下一代TBC的设计。