高双,侯介山,杨飞,王常帅,周兰章.两种铸造镍基合金的高温氧化行为[J].稀有金属材料与工程,2019,47(3):960~966.[Gao Shuang,Hou Jieshan,Yang Fei,Wang Changshuai,Zhou Lanzhang.High Temperature Oxidation Behaviors of Two Cast Ni-based Superalloys[J].Rare Metal Materials and Engineering,2019,47(3):960~966.]
两种铸造镍基合金的高温氧化行为
投稿时间:2017-08-03  修订日期:2017-10-31
中文关键词:  镍基高温合金  抗氧化元素  氧化动力学  氧化机理
基金项目:国家能源局项目(项目号NY20150102);国家自然科学基金资助(项目号No.51571191)
中文摘要:
      利用热重分析法、XRD和SEM(EDS)对比研究了700 ℃超超临界发电机组用K317和K325铸造合金在900℃和1000℃大气环境下氧化行为。结果表明,K317的氧化性能要优于K325。在900℃氧化时,两种合金的氧化增重遵循抛物线规律,而在1000℃氧化时,氧化增重均分段遵循抛物线规律。K317的氧化膜分三层,外层是NiO、TiO2和NiCr2O4,中间层是致密的Cr2O3,内层是内氧化产物Al2O3。而K325的氧化膜分两层,外层是NiO,NiCr2O4和Nb2O5,内层是致密的Cr2O3和嵌入的Nb2O5颗粒,没有内氧化现象发生。在1000℃氧化时,K325中的Mo严重被氧化形成挥发性MoO3;同时氧化膜发生了局部剥落现象,氧化膜的附着性相对较差。
High Temperature Oxidation Behaviors of Two Cast Ni-based Superalloys
英文关键词:Ni-based  superalloy, anti-oxidation  element, oxidation  kinetics, oxidation  mechanism
英文摘要:
      High temperature oxidation behaviors of cast K317 and K325 alloy at 900°C and 1000°C in air environment are contrastively investigated by TGA, XRD and SEM (EDS). The results show that K317 alloy has a superior oxidation resistance compared with K325 alloy. The kinetic curves of two alloys oxidized at 900°C for 100 h obey the parabolic rate law while those at 1000°C obey sectionally the parabolic rate law. The oxide structure of K317, from the top surface down to the base material, consists of NiO-TiO2-NiCr2O4 composite oxide, Cr2O3 oxide dense band and Al2O3 internal oxide. In comparison, internal oxidation is not observed in K325 alloy whose oxide layer is composed by two oxide layers: NiO-NiCr2O4-Nb2O5 composite oxide and Cr2O3 oxide layer. Serious MoO3 volatilization and oxide spallation take place in K325 alloy after the oxidation at 1000°C for 100h. In addition, the adhesion property of K325 alloy is worse than that of K317 alloy due to the occurrence of the micro-voids on the oxide layer/substrate interface.
作者单位E-mail
高双 中国科学院金属研究所 sgao14b@imr.ac.cn 
侯介山 中国科学院金属研究所  
杨飞 中国科学院金属研究所  
王常帅 中国科学院金属研究所  
周兰章 中国科学院金属研究所  
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