【摘要】 研究了磁控溅射NiAl微晶涂层对NiAl-28Cr-5Mo-1Hf和NiAl-33.5Cr-0.5Zr两种共晶合金在1000-1150℃静态空气中氧化性能的影响.添加Cr,Mo,Hf,Zr等元素使NiAl合金由单相转变为多相结构,高温氧化后表面分别形成抗氧化性能较差的Al2O3+Cr2O3十HfO2和Al2O3+Cr2O3十ZrO2复合氧化膜,并且发生严重的内氧化.施加NiAl微晶涂层后,高温下表面形成致密的单一氧化物Al2O3,抗氧化性能得到明显提高.更多还原

【Abstract】 The effect of NiAl microcrystalline coating prepared by magnetron-sputtering on the isothermal oxidation behaviors of two NiAl-based eutectic alloys was investigated in static air at 1000-1150℃. Under high temperature oxidation the two alloys formed a nonprotective Al2O3+ Cr2O3+HfO2 and Al2O3+Cr2O3+ZrO2 mixed scales respectively and exhibited relatively large weight gains. It was found that the isothermal oxidation resistances of the two alloys are remarkably improved by NiAl microcrystalline coating due to the formation of a compact and adherent Al2O3 scale.更多还原