用溅射方法获得了晶粒尺寸小于 0.5μm的微晶Co-30Cr-5Al涂层,并对正常晶粒的CoCrAl合金及其微晶溅射层的1000℃抗循环氧化性能进行了研究。用扫描电镜和声发射技术研究了微晶化对CoCrAl合金表面氧化膜粘附性的影响。结果表明:正常晶粒的 CoCrAl合金经1次循环氧化,初生氧化膜即出现剥落,继而表面生成了氧化铬,而氧化铬的保护性远比氧化铝差;而微晶 CoCrAl涂层经100次循环,表面氧化铝膜仍完好无损。声发射测量结果表明,微晶涂层比正常晶粒的合金具有更高的抗表面氧化膜剥落的能力。
An investigation was carried out of the resistance to cyclic oxidation of the as-cast normal-grained Co-30Cr-5Al alloy substrate at 1000℃ in air together with its sputtered coating of microcrystallized CoCrAl alloy grains sized less than 0.5μm.Acoustic emission counts showed that the initially formed Al_2O_3 scale on the bare alloy substrate cracked and spalled severely off after only one or two cycles on cooling, and then the worse protective layer of Cr_2O_3 and CoCr_2O_4 spinel occurred on surface. While such substrate coated with sputtered microcrystallized CoCrAl alloy film was not damaged under oxidation even through 100 cycles at 1000℃. In comparison with the normal-grained alloy, the microcrystallized alloy coating of similar constitution exhibite more excellent resistance to oxide spalling on surface.
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