Abstract
M-YTaO4 is one of the most promising candidates for the next-generation thermal barrier coatings. However, the CMAS-induced degradation of M-YTaO4 is still in dispute. This work comprehensively investigates the CMAS corrosion of M-YTaO4 at 1300 °C which provides new insights into the corrosion mechanism. CMAS attacks M-YTaO4 forming a thick recession layer and the main corrosion product is accurately confirmed to be (Ca2-xYx)(Ta2-y-zMgyAlz)O7 solid solution. The recession layer presented a small difference in Young's modulus with M-YTaO4. No delamination cracking occurred during the thermal cycling process indicating good reliability. In addition, grain boundary infiltration of CMAS is first revealed in M-YTaO4. The results have corrected the misjudgment of the corrosion mechanism and CMAS infiltration process in previous studies which provides guidelines for the design of M-YTaO4 thermal barrier coatings.
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