中文摘要：

比较研究了高S铸态合金Ni-25Cr-5Al—1S（mass％）及其溅射纳米涂层在1000℃的氧化行为，结果表明：铸态合金在20小时恒温氧化中生长的氧化膜在冷却时发生严重剥落，氧化膜／基体界面局部区域s含量较高；而溅射纳米涂层没有发生氧化膜剥落现象，涂层／氧化膜界面上明显无S的存在．这说明Ni-25Cr-5Al—1S合金纳米化可以有效抑制S对氧化膜／合金界面结合的“毒化效应”，提高了氧化膜的粘附性．

英文摘要：

The oxidation behavior of a high-sulfur-containing cast alloy Ni-25Cr-5Al-1S（ mass% ）and its magnetron-sputtered nanoerystalline coating were comparatively investigated in air at 1000℃ for 20 h. The oxide scale formed on the cast alloy suffered from severe spallation during cooling, and a high sulfur content was detected on the spalled area. However, the oxide scale on nanocrystalline coating was good adherent, and no sulfur was probed at the scale/coating interface. The results strongly suggest that the nanoerystallization of the high S alloy can remarkably enhance the adhesion of the oxide scale formed, through suppressing the interface segregation of S, which is believed a ＂poisonous＂ element weakening the interface bonding.