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.
Fig.1 XRD patterns of nanostructured TBC before and after thermal shock testing at different temperatures: (a) As-sprayed; (b) 1 150℃; (c) 1 200℃; (d) 1 250℃
X-ray diffraction patterns of the as-sprayed conventional TBC and the TBC samples after thermal shock testing at 1 250 ć are shown in Fig.2. The as sprayed conventional TBC is composed of diffusionless transformed tetragonal (t’) phase in accordance with PDF#48-0224. Composition of this phase is Y0.08Zr0.92O1.96. Phase transformation did not occur when thermal shock test was performed at 1 250 ℃. The XRD analysis result indicates that the diffusionlesstransformed tetragonal phase did not decompose into equilibrium monoclinic phase and cubic phase under the experimental conditions.
Fig.2 XRD patterns of conventional TBC: (a) As-sprayed; (b) After thermal shock testing at 1 250 ℃
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