在900-1150℃氧化的NiAl-28Cr-5.94Mo-0.05Hf-0.01Ho定向共晶合金,在其表面生成了连续的Al2O3氧化膜,具有良好的抗氧化性能.定向凝固工艺使合金的组织细化并提高了Cr(Mo)相中Al元素的含量,以及加入微量稀土元素Ho,都有利于生成Al2O3氧化膜.在NiAl-28Cr-5.94Mo-0.05Hf-0.01Ho定向共晶合金的氧化过程中表面氧化膜发生相变θ-Al2O3→α-Al2O3,导致其1000℃氧化质量增加出现反常.
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