(Gd_0.9Sc_0.1)₂Zr₂O₇/YSZ thermal barrier coatings (TBCs) were produced by air plasma spray (APS). Compared with agglomerated particles for thermal spray, (Gd_0.9Sc_0.1)₂Zr₂O₇ coatings had the same phase structure and a close chemical composition. (Gd_0.9Sc_0.1)₂Zr₂O₇/YSZ TBCs revealed a lamellar microstructure, and the (Gd_0.9Sc_0.1)₂Zr₂O₇ coating had some porous zones with many fine particles among the splats. Hot corrosion tests in V₂O₅ at 700–1000 °C indicated that the coating was highly resistant to molten salt penetration, resulting from the formation of a continuous dense reaction layer on the surface. The thickness of the reaction layer was ~20 μm, independent on the corrosion temperature and time. After corrosion at 700 °C, the layer consisted of (Gd, Sc)VO₄ and Sc₂O₃ doped ZrV₂O₇, while at higher temperatures, it was composed of (Gd,Sc)VO₄ and monoclinic ZrO₂. The mechanism by which these corrosion products formed is clarified based on phase diagrams and Lewis acid-base rule.

（Gd _0.9 Sc _0.1）₂ Zr ₂ O ₇ / YSZ隔热涂层（TBC）通过空气等离子喷涂（APS）制成。与热喷涂团聚颗粒相比，（Gd _0.9 Sc _0.1）₂ Zr ₂ O ₇涂层具有相同的相结构和紧密的化学组成。（Gd _0.9 Sc _0.1）₂ Zr ₂ O ₇ / YSZ TBCs显示出层状微结构，而（Gd _0.9 Sc _0.1）₂ Zr ₂ O ₇涂层之间有一些多孔区域，在小片之间有许多细小颗粒。在700–1000°C的V ₂ O _5中进行的热腐蚀测试表明，该涂层具有很高的耐熔融盐渗透性，这是由于在表面上形成了连续的致密反应层所致。反应层的厚度为〜20μm，与腐蚀温度和时间无关。在700°C腐蚀后，该层由掺杂了（Gd，Sc）VO ₄和Sc ₂ O _3的ZrV ₂ O _7组成，而在较高温度下，该层由（Gd，Sc）VO ₄和单斜晶ZrO _2组成。。根据相图和路易斯酸碱法则阐明了形成这些腐蚀产物的机理。