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采用机械合金化(MA)和真空烧结工艺制备了Y2O3质量分数为2%～20%的氧化物弥散强化(ODS)镍基高温合金,在1 000℃空气中对合金试样进行100h的静态氧化实验,研究了Y2O3含量对合金高温氧化性能的影响与作用机制.结果表明:适量稀土氧化物Y2O3的加入(质量分数≤5%)可促进完整Cr2O3氧化膜的形成,提高氧化膜与合金基体的附着力,改善氧化膜的抗剥落性,减缓合金在1 000℃的氧化速度,从而有效提高合金的抗高温氧化性能.但过量添加则会使其抗氧化性能迅速下降.
The ODS nickel-based superalloy with Y2O3 content of 2% ~ 20% was prepared by mechanical alloying (MA) and vacuum sintering. The alloy samples were subjected to static oxidation at 1000 ℃ for 100h The effect and mechanism of Y2O3 content on the high temperature oxidation performance of the alloy were studied.The results showed that the addition of proper amount of Y2O3 (mass fraction ≤5%) can promote the formation of complete Cr2O3 oxide film and improve the oxidation film and alloy matrix Adhesion, improve the anti-spalling of the oxide film, slow down the oxidation rate of the alloy at 1 000 ℃, thus effectively improve the high temperature oxidation resistance of the alloy, but excessive addition will make its oxidation resistance decreased rapidly.