一种铸造镍基高温合金的氧化行为  

Oxidation Behavior of a Cast Ni-Base Superalloy

作　　者：陈阳[1] 吴树森[1] 刘龙飞[1] 林冲[1] 于光明[2] 

机构地区：[1]华中科技大学材料成型与模具技术国家重点实验室,湖北武汉430074 [2]武汉钢铁集团公司,湖北武汉430060

出　　处：《铸造》2014年第1期62-66,共5页Foundry

摘　　要：利用静念增重法研究了铸造镍基高温合金Ni48Cr28在950～1150℃濉度范同内的氧化动力学，其氧化动力学曲线符合抛物线规律。环境扫描电镜和能谱分析表明，Ni48Cr28合金的氧化膜最外层是比较致密的Mn与Cr氧化物混合层．中间层是性质致密的Cr2O3，氧化层，内层是疏松的SiO2。通过研究添加稀上元素的Ni48Cr28往950～1150℃高温抗氧化性能，结果表明适当的稀土元素能提高合金在950～1150℃的抗氧化性能。The oxidation kinetics of a cast Ni-based superalloy Ni48Cr28 over the temperature range of 950℃ to 1 150℃was studied by thermogravimetric analysis method. The results indicate that oxidation kinetics curve obeys parabolic law. The oxidation films on the surface were determined by ESEM, and EDX. The results show that oxidation films are composed of rather dense upper layer consisted of Mn and Cr, compact intermediate layer Cr2O3, as well as loose internal layer SiO2. The high-temperature oxidation resistance of the Ni48Cr28 superalloy with rare earth elements was also investigated. The results show that the oxidation resistant performance is improved by rare earth elements addition.

关 键 词：镍基高温合金 高温氧化 氧化动力学 稀土元素 

分 类 号：TG136.1[一般工业技术—材料科学与工程]