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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。
The microcrystalline Co-30Cr-5Al coating with grain size less than 0.5μm was obtained by sputtering method. The cyclic oxidation resistance of CoCrAl alloy with normal grain size and its microcrystalline sputtering layer at 1000 ℃ was studied. The effect of microcrystallization on the surface oxide film adhesion of CoCrAl alloy was studied by SEM and acoustic emission. The results show that the CoCrAl alloy with normal grain size undergoes one cycle of oxidation and the primary oxide film is peeled off, then the surface is formed with chromium oxide, while the protection of chromium oxide is far worse than that of alumina; while the microcrystalline CoCrAl coating undergoes 100 cycles Circulation, the surface of the alumina film is still intact. Acoustic emission measurements show that the microcrystalline coating has a higher resistance to surface oxide film flaking than normal grain alloys.