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Feather-like columnar structured 7YSZ thermal barrier coating (TBC) was prepared by plasma spray-physical vapor deposition (PS-PVD). An aluminum (Al) film was deposited on the TBC surface by magnetron sputtering. The Al-deposited TBC was vacuum heat-treated at 665°C, 808°C and 900°C for 1h separately. Then an α-Al2O3 layer was observed on the top of 7YSZ coating, which resulted from in situ reaction...
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