The monoclinic phase content in TBCs is important in predicting TBCs thermal shock performance. The lower the monoclinic phase content, the better the thermal shock performance of TBCs will be. X-ray diffraction patterns of the as-sprayed nanostructured TBC and the TBC samples after thermal shock testing at 1 150, 1 200, and 1 250℃ are shown in Fig.1. The as sprayed nano-structured TBC is composed of cubic phase in accordance with PDF#30-1468. Composition of the cubic phase is Y0.15Zr0.85O1.93. After thermal shock testing at 1 150, 1 200 and 1 250 ℃, no obvious phase change was found.
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