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采用低温超音速火焰喷涂工艺(LT-HVOF)制备了NiCoCrAlYTa合金涂层,通过静态氧化增量方法绘制氧化动力学曲线并计算氧化速率常数;用XRD、SEM及EDS表征涂层氧化后表面的物相组成、形貌和生成氧化物成分。结果表明:低温超音速火焰喷涂制备的NiCoCrAlYTa涂层在900、1000和1100℃氧化200h后,均达到完全抗氧化级。900℃和1000℃氧化时,涂层表面均形成致密连续的α-Al_2O_3层;1100℃氧化时,氧化产物可分为两层,外层为Cr_2O_3和尖晶石氧化物,内层为α-Al_2O_3。
NiCoCrAlYTa alloy coatings were prepared by low-temperature supersonic flame spraying (LT-HVOF), and the oxidation kinetics curves were calculated by static oxidation increment method. The oxidation rate constants were calculated. The surface oxides were characterized by XRD, SEM and EDS Phase composition, morphology and oxide composition. The results show that the NiCoCrAlYTa coatings prepared by the low temperature supersonic flame spraying have reached the complete oxidation resistance level after being oxidized at 900, 1000 and 1100 ℃ for 200 h. At 900 ℃ and 1000 ℃, the dense and continuous α-Al_2O_3 layer was formed on the surface of the coating. At 1100 ℃, the oxidation product was divided into two layers, the outer layer was Cr_2O_3 and spinel oxide, the inner layer was α- Al 2 O 3.