Abstract
In the present work, ZrO2–Y2O3 thermal barrier coatings (YSZ TBCs) and La2Zr2O7/ZrO2–Y2O3 thermal barrier coatings (LZ/YSZ TBCs) were prepared by atmospheric plasma spraying (APS) respectively, and then were surface remelted by laser remelting process. Thereupon, high temperature oxidation experiment was carried out at 1100 °C. The results showed that the compactness of these two kinds of as-sprayed TBCs was enhanced by remelting treatment. Hence, compared with the as-sprayed TBCs, the weight gains of the remelted TBCs were smaller, the thermally grown oxide (TGO) was thinner, and no obvious holes formed in the TGO. Al2O3, oxides of Cr, Co, Ni elements formed successively, eventually CS (spinel type oxides) formed in TGO of the remelted YSZ TBCs. However, due to the presence of La3+ in the remelted LZ/YSZ TBCs, the oxidation rate of Al, Cr, Co, Ni elements was slowed down, thus the formation of CS was delayed accordingly. Therefore, the high temperature oxidation resistance of the YSZ TBCs and the LZ/YSZ TBCs was improved by laser remelting treatment, and the remelted LZ/YSZ TBCs was superior to the remelted YSZ TBCs.
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