含铼镍基单晶高温合金在900℃的循环氧化行为  

Cyclic Oxidation Behaviour of Single-Crystal Ni-Based Superalloy Containing Rhenium in Air at 900 ℃

作　　者：郝清伟[1] 卢旭东[1] 郭策安[1] 马树武[1] 王杰[1] 

机构地区：[1]沈阳理工大学装备工程学院,辽宁沈阳110159

出　　处：《铸造》2011年第12期1190-1193,共4页Foundry

摘　　要：采用X射线衍射(XRD),扫描电镜(SEM)及能谱(EDAX)等手段,研究了一种含铼镍基单晶高温合金在900℃的高温循环氧化行为。结果表明,在氧化初期合金的氧化质量增加较快,随着氧化时间延长氧化增重和失重交替进行,氧化动力学曲线不符合抛物线规律。高温氧化期间,合金发生明显的外氧化和内氧化,900℃氧化形成的氧化膜由三层组成,外层氧化膜由NiO、Al2O3和(Ni,Co)Cr2O4组成;中间层为平直的CrTaO4及AlTaO4层;内层氧化物为Al2O3。在合金的氧化期间,分布在中间层的富Re、Ta和W相可抑制基体中Al向外扩散,并抑制氧化膜的生长,使氧化速度降低。By means of SEM, XRD and EDAX, the high temperature cyclic oxidation behavior of the single-crystal Ni-base superalloy containing rhenium at 900 ℃ in air was investigated. Results show that the initial oxidation rate is large, and the weight loss and gain occurs alternately in the different stages of the oxidation; the oxidation kinetics does not obey parabolic law. An obvious outside oxidation and internal oxidation occurs during the high temperature oxidation. After oxidized at 900 ℃, three oxide layers form in the alloy including the outer layer consists of NiO, Al2O3 and （Ni, Co）Cr2O4 phases, middle layer consists of CrTaO4 and AlTaO4 phase, and the internal oxidizing layer is identified as Al2O3 phase. During the oxidizing process of the alloy, the phases that are rich in Ta, Re and W may restrain the element AI in the matrix from diffusing outward, which restrains the growth of the oxide layers so as to decrease the oxidizing rate of the alloy.

关 键 词：单晶 镍基高温合金 RE 循环氧化 

分 类 号：TG132.32[一般工业技术—材料科学与工程]