(中国科学院金属腐蚀与防护研究所金属腐蚀与防护国家重点实验室，沈阳110015)
摘 要: 研究了一种低Cr、低Al的Ni-Cr-Al系合金Ni-5Cr-5Al(摩尔分数，%)溅射涂层的抗高温氧化性能。结果表明：虽然Ni-5Cr-5Al溅射涂层在1000 ℃氧化200 h后外表面生成NiO，NiAl2O4和Al2O3等复杂氧化物，但表现出很高的抗高温氧化性能。进一步分析表明，这一方面与溅射纳米晶涂层上生成的外氧化物粘附性好有关，另一方面与在NiO，NiAl2O4和涂层之间生成一层完整的α-Al2O3 有关。此外还讨论了在Al含量很低情况下Ni-5Cr-5Al溅射涂层Al2O3的生长机制。
关键字: Ni-5Cr-5Al；高温氧化；溅射；纳米晶涂层
（State Key Laboratory for Corrosion and Protection, Institute of Corrosion and Protection of Metals,
The Chinese Academy of Sciences, Shenyang 110015, P.R.China）
Abstract:The oxidation resistance of sputtered Ni-5Cr-5Al(mole fraction, %) coating in air at 1000 ℃ was investigated. The results indicated that NiO, NiAl2O4 and α-Al2O3 complex oxide were formed on the sputtered coating after 200h oxidation where as good oxidation resistance was shown. The good oxidation resistance is relate d to the excellent adhesion shown by the oxide scale and a complete α-Al2O3 layer formed between the NiO, NiAl2O4 layer/coating. The formation mechanism of α-Al2O3 was studied.
Key words: sputtering; nanocrystalline coating; Ni-Cr-Al; oxidation resistance
