【摘要】 本文研究了Ｃｏ－２Ｙ与Ｃｏ－５Ｙ（原子分数，％，下同）合金在６００－８００℃空气中的氧化行为，纯Ｃｏ在三个温度下的氧化符合抛物线规律。Ｃｏ－Ｙ合金在８００℃下的氧化符合抛物线规律，而在７００℃时则接近于立方速率规律，在６００℃时Ｃｏ－２Ｙ合金氧化仍遵循立方速率规律，而Ｃｏ－５Ｙ合金则偏离立方和抛物线速率规律，Ｃｏ－Ｙ合金表面形成的氧化膜为Ｃｏ的氧化物和Ｙ２Ｏ３的混合物。Ｙ２Ｏ３的分布继承了金属间化合物相Ｃｏ(１７)Ｙ２在原始合金中的分布形态。ＣＯ－Ｙ合金内氧化严重。讨论了合金氧化机制。更多还原

【Abstract】 The oxidation of pure Co and binary Co-Y alloys containing 2% and 5% Y(atomic fraction)respectively at 600-800 ℃ in air has been studied. The oxidation of pure Co at all temperatures followsthe parabolic rate law. The oxidation of Co-Y alloys follows the parabolic law at 800 ℃ , but cubic ratelaw at 700 ℃ . The oxidation of Co-2Y alloy at 600 ℃ is still cubic, but that of Co-5Y alloy is irregularand deviates from the parabolic and cubic law. The scales grown on the Co-Y alloys are composed of Cooxides and Y2O3. The distribution of Y2O3 follows closely that of the intermetallic compound Co17Y2 inthe alloys. Co-Y alloys undergo serious internal oxidation. The oxidation mechanism of the alloys is alsodiscussed.更多还原