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.
The oxidation behavior of a high-sulfur-containing cast alloy Ni-25 Cr-5 Al-1S (mass%) and its magnetron-sputtered nanocrystalline 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 con-tent was detected on the spalled area. However, the oxide scale on nanocrystalline coating was good adher-ent, and no sulfur was probed at the scale/coating interface. The results strongly suggest that the nanocrys-tallization of the high S alloy can remarkably enhance the adhesion of the oxide scale formed, through sup-pressing the interface segregation of S, which is believed a "poisonous" element weakening the interface bonding.
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