【摘要】 研究了 ＮｉＡｌ－２８Ｃｒ—５Ｍｏ—１Ｈｆ合金在 １０００—１２００℃空气中的氧化行为 Ｘ射线结构分析表明，氧化膜主要由α -Ａｌ２Ｏ３构成，并含有Ｃｒ２Ｏ３和少量ＨｆＯ２．采用扫描电镜和能谱分析研究了氧化产物的微观组织及成分，并从合金相组成探讨了ＮｉＡｌ－２８Ｃｒ—５Ｍｏ—１Ｈｆ合金的氧化机制更多还原

【Abstract】 The isothermal oxidation behavior of NiAl-28Cr-5Mo-1Hf alloy at 1000-1200 ℃ in air has been studied. The results show that isothermal oxidation kinetics of the NiAl-28Cr-5Mo-1Hf alloy obeys the parabolic law at all test temperatures. The microstructure and composition of the oxide layer have been studied by means of X-ray diffractometer, scanning electron microscope with an EDAX unit. The oxidation scale mainly consists of a-Al2O3, and there are also Cr2O3 and a little HfO2. The oxidation mechanism was discussed from the phase contitution.更多还原