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阐明了CoCrAl合金高温氧化性能差的根源在于氧化过程中,除了金属离子M~+(主要是Cr~(3+)和Co~(2+))通过氧化皮向外扩散外,还有O~(-2)和N~(-3)通过氧化皮向合金基体扩散,发生内氧化和内氮化,生成α-A1_2O_3和ALN,使A1的来源衰竭,在表面不能生成完整的α-Al_2O_3保护膜的缘故。添加Y改变了氧化皮的生长机制,磁控溅射使涂层合金微晶化,均在外表面生成完整的具保护性的α—Al_2O_3氧化皮,是改善CoCrAl合金高温氧化性能的主要原因。
It is elucidated that the root cause of the poor high temperature oxidation performance of CoCrAl alloy lies in the oxidation process, in addition to the diffusion of metal ions M ~ + (mainly Cr ~ (3+) and Co ~ (2+)) through oxide scale, (-2) and N ~ (-3) diffuse through the scale to the matrix of the alloy and undergo internal oxidation and internal nitriding to generate α-A1_2O_3 and ALN, which cause the source of A1 to fail, and complete α-Al_2O_3 protection can not be formed on the surface Film reason. Addition of Y changed the growth mechanism of the oxide scale. Magnetron sputtering resulted in the micro-crystallization of the coating alloy, which formed the complete protective α-Al 2 O 3 scale on the outer surface, which was the main reason for improving the high-temperature oxidation performance of the CoCrAl alloy.