【摘要】 综合性能优异的热障/环境障涂层是先进航空发动机涡轮叶片等高温部件的关键热防护材料。本研究通过两步烧结法制备了高熵稀土铪酸盐(La_0.2Gd_0.2Ho_0.2Er_0.2Tm_0.2)₄Hf₃O₁₂和(Yb_0.2Lu_0.2Ho_0.2Er_0.2Tm_0.2)₄Hf₃O₁₂，系统研究了两种材料的力学、热学性能和CMAS腐蚀性能。多主元高熵材料具有较低的热膨胀系数和热导率，其中(Yb_0.2Lu_0.2Ho_0.2Er_0.2Tm_0.2)₄Hf₃O₁₂表现出比(La_0.2Gd_0.2Ho_0.2Er_0.2Tm_0.2)₄Hf₃O₁₂更高的硬度和断裂韧性。1300℃下CMAS腐蚀结果表明，(La_0.2Gd_0.2Ho_0.2Er_0.2Tm_0.2)₄Hf₃O₁₂与CMAS的反应速率快，更容易析出磷灰石，对阻止CMAS迅速渗透是有益的。高熵稀土铪酸盐材料具有优异的综合性能，在热障/环境障涂层领域具有良好的应用前景。更多还原

【Abstract】 Thermal/environmental barrier coating with optimized performance is critical for the application in advanced aero-engines.In this work,high-entropy rare-earth hafnates,(La_0.2Gd_0.2Ho_0.2Er_0.2Tm_0.3)₄Hf₃O₁₂ and(Yb_0.2Lu_0.2Ho_0.2Er_0.2Tm_0.2)₄Hf₃O₁₂,were prepared by a two-step sintering method.Mechanical properties,thermal properties and CM AS corrosion behavior of two materials were systematically investigated.(Yb_0.2Lu_0.2Ho_0.2Er_0.2Tm_0.2)₄Hf₃O₁₂ exhibits higher hardness and fracture toughness than that of(La_0.2Gd_0.2Ho_0.2Er_0.2Tm_0.2)₄Hf₃O₁₂.High-entropy hafnates demonstrate reduced coefficient of thermal expansion and thermal conductivity.When corroded at 1300℃,the reaction of(La_0.2Gd_0.2Ho_0.2Er_0.2Tm_0.2)₄Hf₃O₁₂ with molten CMAS is more severe and triggers the precipitation of apatite,which mitigates the infiltration of molten CMAS into thermal/environmental barrier coatings.The rare earth hafnate has been regarded as a promising thermal barrier coating material.更多还原