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郭伟杰,李建树,陆燕玲,张继祥,周兴泰.Si对Hastelloy N合金氧化行为的影响[J].稀有金属材料与工程(英文),2019,47(3):885~891.[Guo Weijie,Li Jianshu,Lu Yanling,Zhang Jixiang and Zhou Xingtai.Effects of silicon on the oxidation behavior of Hastelloy N superalloy at 850℃[J].Rare Metal Materials and Engineering,2019,47(3):885~891.]
Effects of silicon on the oxidation behavior of Hastelloy N superalloy at 850℃
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Received:August 11, 2017  Revised:October 14, 2017
DOI:
Key words: Hastelloy N superalloy  high-temperature oxidation  silicon  oxidation kinetics  oxide scale
Foundation item:国家自然科学基金资助(项目号51674237);超轻材料与表面技术教育部重点实验室
Author NameAffiliation
Guo Weijie,Li Jianshu,Lu Yanling,Zhang Jixiang and Zhou Xingtai  
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Abstract:
      The isothermal oxidation behavior of Hastelloy N superalloy with different silicon contents in air at 850℃ were investigated by using discontinuous increasing weight method. The results showed that oxidation mass gain kinetics of the samples follow the parabolic law. It was observed that the surfaces of the alloys exhibited a multi-layer structure after 100h oxidation. The outer oxide flim of Hastelloy N superalloy mainly consists of NiO, NiFe2O4and other oxide composites. The middle layer is confirmed to be Cr2O3 and MoO2. Since a continuous and dense SiO2 sublayer is formed at the metal-oxide interface, it is effective to prevent Cr diffusion. The addition of Si promotes the formation of a relatively continuous and compact Cr2O3 and it can strongly improve the oxidation resistance.