Abstract Hf6Ta2O17 ceramics are successfully prepared by solid state reaction and pressureless sintering. The mechanical properties and the calcium-magnesium-alumino-silicate (CMAS) corrosion behavior of Hf6Ta2O17 ceramics are studied. The hardness, elastic modulus and fracture toughness of Hf6Ta2O17 ceramics are 18.45 GPa, 273.42 GPa and 2.6–3.1 MPa m1/2, respectively. As the Hf6Ta2O17 ceramics are attacked by CMAS, the reaction layer and dense layer are formed on the ceramic surface, which prevents the further infiltration of molten CMAS. HfSiO4 and Ca2Hf7O16 are confirmed as the main reaction products of Hf6Ta2O17 and CMAS. Hf6Ta2O17 ceramics exhibit better CMAS corrosion resistance than 8 wt% yttria stabilized zirconia (8YSZ) ceramics, which is attributed to the dense structure formed by corrosion products (hafnium tantalum oxide and Ca2Hf7O16) and lower theoretical optical basicity (OB) value. Furthermore, Hf6Ta2O17/YSZ double ceramic top coat thermal barrier coatings (TBCs) are successfully prepared by plasma spraying, and the thermal cycling performance is investigated. Hf6Ta2O17/YSZ double-layers TBCs has good thermal cycling performance as 8YSZ single-layer TBCs.

中文翻译：

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一种用于热障涂层的有前景的 Hf6Ta2O17 陶瓷的机械性能和钙镁铝硅酸盐 (CMAS) 腐蚀行为

摘要 通过固相反应和常压烧结成功制备了Hf6Ta2O17陶瓷。研究了Hf6Ta2O17陶瓷的力学性能和钙镁铝硅酸盐(CMAS)腐蚀行为。Hf6Ta2O17 陶瓷的硬度、弹性模量和断裂韧性分别为 18.45 GPa、273.42 GPa 和 2.6-3.1 MPa m1/2。由于Hf6Ta2O17陶瓷受到CMAS的攻击，陶瓷表面形成了反应层和致密层，阻止了熔融CMAS的进一步渗透。HfSiO4 和 Ca2Hf7O16 被确认为 Hf6Ta2O17 和 CMAS 的主要反应产物。Hf6Ta2O17 陶瓷表现出比 8 wt% 氧化钇稳定氧化锆 (8YSZ) 陶瓷更好的 CMAS 耐腐蚀性，这归因于腐蚀产物（铪钽氧化物和 Ca2Hf7O16）形成的致密结构和较低的理论光学碱度 (OB) 值。此外，通过等离子喷涂成功制备了Hf6Ta2O17/YSZ双陶瓷面涂层热障涂层（TBCs），并研究了热循环性能。Hf6Ta2O17/YSZ双层TBCs与8YSZ单层TBCs一样具有良好的热循环性能。