Effect of alloying elements on oxidation behavior of Co-Al-W alloys at high temperature

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	Effect of alloying elements on oxidation behavior of Co-Al-W alloys at high temperature
	Xu, Yang-Tao 1,2; Xia, Tian-Dong 1,2; Yan, Jian-Qiang 1,2; Zhao, Wen-Jun 1,2
刊名	Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
	2010-11-01
卷号	20 期号:11 页码:2168-2177
关键词	Alloying Alloying elements Cobalt alloys Deterioration Molybdenum alloys Niobium Niobium alloys Scale (deposits) Tantalum alloys Ternary alloys Thermooxidation Titanium alloys Tungsten alloys Alloy surfaces Anti-oxidation Antioxidant properties High temperature High temperature oxidation Behavior Multi-layered structure Oxidation behaviors Oxidation film
ISSN号	10040609
英文摘要	The oxidization kinetics of novel Co-Al-W supperalloys in air at 800 and 900°C, and the effects of alloying elements (Mo, Nb, Ta, Ti) on oxidation behavior of Co-Al-W alloys at high- temperatures were investigated. The results show that after being oxidized at 800°C for 100 h, the mass gain of Co-8.8Al-9.8W or Co-8.8Al-9.8W-2Ta is less, indicating that they have better anti-oxidative ability than other alloys at 800°C. After being oxidized at 900°C, the mass gain of Co-8.8Al-9.8W-2Mo, Co-8.8Al-9.8W-2Nb, Co-8.8Al-9.8W-2Ta or Co-8.8Al-9.8W-2Ti is less than that of Co-8.8Al-9.8W alloy, indicating that for anti-oxidant property, Co-8.8Al-9.8W-2Mo, Co-8.8Al-9.8W-2Nb, Co-8.8Al-9.8W-2Ta and Co-8.8Al-9.8W-2Ti alloys are superior to Co-8.8Al-9.8W alloy. There are agglomeration, voids at local scale/alloy interface, crack and deterioration in the oxidation films on Co-Al-W alloy surfaces at different temperatures. The oxide scales exhibit multi-layered structure including an outer layer of Co3O4 oxide, an intermediate mixed layer of oxides of W, Al and alloying elements and an internal attacked layer of oxides of Co and Al. According to the fitted oxidization kinetic curves, the ability of alloying elements (Mo, Nb, Ta, Ti) on the anti-oxidation of Co-Al-W alloy is in an decreasing order of Ta, Ti, Mo, Nb at 800°C, but Ti, Ta, Mo, Nb at 900°C.
语种	中文
出版者	Central South University of Technology
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150249]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
作者单位	1.State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China; 2.Key Laboratory of Non-ferrous Metal Alloys, Lanzhou University of Technology, Lanzhou 730050, China
推荐引用方式 GB/T 7714	Xu, Yang-Tao,Xia, Tian-Dong,Yan, Jian-Qiang,et al. Effect of alloying elements on oxidation behavior of Co-Al-W alloys at high temperature[J]. Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,2010,20(11):2168-2177.
APA	Xu, Yang-Tao,Xia, Tian-Dong,Yan, Jian-Qiang,&Zhao, Wen-Jun.(2010).Effect of alloying elements on oxidation behavior of Co-Al-W alloys at high temperature.Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,20(11),2168-2177.
MLA	Xu, Yang-Tao,et al."Effect of alloying elements on oxidation behavior of Co-Al-W alloys at high temperature".Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals 20.11(2010):2168-2177.