Abstract

As a novel candidate of thermal barrier coatings materials proposed recently, rare earth tantalates (RETaO4) are attractive series because of its excellent attributes. With respect to RETaO4 compound, it exists at least three types of polymorphs and two phase-transformation mechanisms. In this paper, the monoclinic (Y1-xYbx)TaO4 compounds with diverse space groups are investigated systematically, and contents involve phase, microstructural and thermophysical properties’ evolution with the changes of composition and structure. The primary purpose of this paper is to optimize the thermophysical properties of (Y1-xYbx)TaO4 ceramics by adjusting the Y/Yb ratio, and further physical mechanisms of its heat transfer are also revealed.

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