(1. 中南大学 粉末冶金国家重点实验室，长沙 410083；
2. 西北有色金属研究院 金属多孔材料国家重点实验室，西安 710016)
摘 要: 研究Ni-Cr-Al-Fe基合金粉末在600 ℃空气中的高温抗氧化性能，分析铝含量和预氧化处理对合金粉末高温抗氧化行为的影响。利用水雾化法制备不同铝含量的Ni-Cr-Al-Fe基合金粉末，利用静态质量增加法研究不同铝含量合金粉末的氧化动力学，分别利用FE-SEM(EDS)和XRD观察分析不同合金粉末氧化膜的形貌及成分，结合氧化动力学及氧化膜的组成进一步分析不同合金粉末的高温氧化机理。结果表明：Ni-Cr-Al-Fe基合金粉末在600 ℃时的氧化质量增加遵循抛物线规律，铝含量的增加及预氧化处理均可提高合金粉末的抗氧化能力；铝含量的增加使氧化膜的组成由Cr2O3和Al2O3的混合结构转变为单一的Al2O3氧化膜结构，这有利于提高合金粉末的抗氧化性能；预氧化处理所形成的氧化膜有效地抑制Ni-Cr-Al-Fe基合金粉末的进一步氧化。
关键字: Ni-Cr-Al-Fe基合金粉末；高温抗氧化性；预氧化；氧化机理
Ni-Cr-Al-Fe based powders
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China；
2. State Key Laboratory of Porous Metals Materials, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:The oxidation resistance of Ni-Cr-Al-Fe based powders at 600 ℃ was investigated, and the effects of aluminum content and pre-oxidation treatment on its oxidation resistance behavior were analyzed. The Ni-Cr-Al-Fe based powders were prepared by water atomization. The oxidation kinetics was investigated by conducting the mass increase analyses. The morphology and chemical composition of the oxide films were characterized by FE-SEM (EDS) and XRD, respectively. The oxidation mechanisms of the alloy powders were also discussed by comprehensive analysis of oxidized kinetics and the phase composition of oxide layers. The results indicate that the oxidized kinetic curves of Ni-Cr-Al-Fe based powders at 600℃ follow the parabolic rule. The increase of the aluminum content and the pre-oxidation can enhance the oxidation resistance of Ni-Cr-Al-Fe based powders. With the increase of aluminum content, the oxide film changes from a combined structure of Cr2O3 and Al2O3 to single Al2O3 structure, which is beneficial to the increase oxidation resistance of Ni-Cr-Al-Fe based powders. The further oxidation of Ni-Cr-Al-Fe based powders can be effectively controlled after the pre-oxidation treatment.
Key words: Ni-Cr-Al-Fe based powders; high-temperature oxidation resistance; pre-oxidation; oxidation mechanism
