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采用粉末冶金方法制备不同石墨含量(0%、3%、6%)的镍基高温合金,研究合金材料在900℃和100h下的恒温氧化行为,用扫描电镜和X射线衍射对其氧化表面形貌和成分进行观察和分析。结果表明:石墨含量较低(0%,3%)时,镍基合金氧化动力学符合抛物线规律,表面氧化膜无剥落;石墨含量为0%的合金氧化膜由Cr2O3和NiCr2O4组成,石墨含量为3%的合金氧化膜由Cr2O3组成,当石墨含量增加到6%时,大量石墨的氧化分解导致合金初始氧化严重,石墨分解后的孔洞加速氧化反应过程。根据氧化膜的组成分析了合金的氧化机制。
The nickel-base superalloy with different graphite contents (0%, 3%, 6%) was prepared by powder metallurgy method. The oxidation behavior of the alloy at 900 ℃ and 100h was studied. The oxidation behavior of the superalloy was investigated by SEM and XRD. Appearance and composition of the observation and analysis. The results show that the oxidation kinetics of the Ni-based alloy are in accordance with the parabolic law with no graphite content (0%, 3%), and the oxide film on the surface is free from flaking. The oxide film with 0% graphite content consists of Cr2O3 and NiCr2O4, 3% of the alloy oxide film composed of Cr2O3, when the graphite content increased to 6%, a large number of graphite oxide oxidation lead to serious initial oxidation of the alloy, graphite decomposition of the pores to accelerate the oxidation reaction process. The oxidation mechanism of the alloy was analyzed according to the composition of oxide film.