纯Ce及Co-Ce合金在低氧压下的氧化

Oxidation of Pure Ce and Co Ce Alloy under Low Oxygen Pressure

研究了纯Ｃｅ和含１５％Ｃｅ（质量分数）的Ｃｏ－Ｃｅ合金在６００～８００℃低氧压下的氧化。纯Ｃｅ氧化后形成ＣｅＯ２的外氧化膜，而Ｃｏ－１５Ｃｅ则形成Ｃｅ的内氧化区。合金的内氧化速度比利用氧在纯Ｃｏ中的扩散系数及溶解度而计算的值快得多，且在７００℃和８００℃时合金的表面上形成了纯金属Ｃｏ的薄层，这均与由Ｃｅ的内氧化产生的体积膨胀而引起的内应力和微裂纹有关。

The oxidation of pure Ce and Co Ce alloy containing 15wt% Ce under low oxygen pressures was studied at 600～800℃.After oxidation pure Ce produced outer CeO 2 scale,while Co 15Ce alloy only formed an internal oxidation region.The speed of internal oxidation was very much faster than that calculated from the known values of the diffusivity and solubility of oxygen in pure Co.At 700 and 800℃ a thin outer layer of pure Co was produced on the suface of Co 15Ce alloy,which is related with the stresses and microcracks from the increase in volume due to internal oxidation of Ce.