Preparation and oxidation behavior of NiCrAlYSi coating on a cobalt-base superalloy K40S

被引：45
|
作者：
Zhang, K. [1 ,2 ]
Wang, Q. M. [2 ]
Sun, C. [2 ]
Wang, F. H. [2 ]
机构：
[1] Shengyang Normal Univ, Chem & Life Coll, Shenyang 110034, Peoples R China
[2] Chinese Acad Sci, State Key Lab Corros & Protect, Inst Met Res, Shenyang 110016, Peoples R China
来源：
CORROSION SCIENCE | 2008年 / 50卷 / 06期
基金：
中国国家自然科学基金;
关键词：
cobalt-base superalloy K40S; NiCrAlYSi coating; arc ion plating; high temperature oxidation; inter-diffusion;
D O I：
10.1016/j.corsci.2008.01.033
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Arc ion plating had been employed on a cobalt-base superalloy K40S to deposit a NiCrAlYSi coating to improve its oxidation resistance at 1323-1423 K in air. The K40S superalloy had poor oxidation resistance because a non-protective and easy spalling surface oxides scale mixed of Cr2O3 and CoCr2O4 was formed on its surface. After coated with NiCrAlYSi coating, a dense and protective alpha-Al2O3 scale was formed on the coating and excellently improved its oxidation resistance. Inter-diffusion obviously occurred between the coating and the substrate K40S superalloy in oxidation process, which resulted from Co atoms in K40S outwards diffused. A richen Cr and W carbides inter-diffusion layer was formed, which could acted as a diffusion barrier that barred Al atoms in coating inwards diffusion. Though the NiCrAlYSi changed into NiCoCrAlYSi during oxidation process, it still possessed a good oxidation resistance and. had a considerable long-term life. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1707 / 1715
页数：9
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