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测定了ＤＺ４０Ｍ 钴基合金在９００ ～１１００ ℃空气中的氧化动力学曲线，观察分析了各温度下经不同时间氧化后合金的表面氧化物形貌和组成。该合金在９００ 和１０００ ℃的静态氧化较好地符合抛物线规律，而在１０５０ 和１１００ ℃时由于氧化皮严重开裂和剥落而近乎呈直线发展。两者的氧化层形成机制有所不同，９００ 和１０００ ℃的后期氧化产物以Ｃｒ２Ｏ３ 为主，形成连续致密的保护层；１０５０ 和１１００ ℃的后期氧化产物以ＣｏＣｒ２Ｏ４ 为主，不形成完整的Ｃｒ２Ｏ３ 保护层。
The oxidation kinetics curves of DZ40M cobalt-based alloy in air at 900 ~ 1100 ℃ were measured. The surface oxide morphology and composition of the alloy after oxidation at different temperatures were observed and analyzed. The static oxidation of the alloy at 900 and 1000 ° C fits well with the parabolic law and almost linearly develops at 1050 and 1100 ° C due to severe cracking and spalling of scale. The formation mechanisms of the two oxide layers are different. The post-oxidation products at 900 and 1000 ° C are dominated by Cr2O3, forming a continuous and dense protective layer. The post-oxidation products at 1050 and 1100 ° C mainly consist of CoCr2O4 without complete Cr2O3 protection Floor.