用磁控溅射技术获得了晶粒尺寸小于100nm的Co—30Cr—5Al微晶涂层。对同成分CoCrAl合金及其微晶涂层进行1100℃恒温和1000℃循环氧化试验,并与CoCrAlY合金进行比较。用声发射技术、划痕法及透射电镜对溅射CoCrAl微晶涂层的抗氧化机理进行了研究。结果表明微晶化提高了CoCrAl合金表面氧化膜的粘附性,从而大大改善了合金的抗恒温与循环氧化性能。而微晶化提高氧化膜粘附性的原因是:(1)微晶表面氧化膜比铸态合金表面氧化膜的晶粒细得多,细晶氧化膜可通过扩散蠕变释放生长应力和部分热应力;(2)
A microcrystalline Co-30Cr-5Al coating with grain sizes <0.1μm was obtained using magnetron sputtering technique.Isothermal oxidation at 1100℃ and cyclic oxidation at 1000℃ for cast Co-30Cr-5Al alloy and its sputter deposited microcrystalline coating were
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