The oxidation and hot corrosion of an aluminide coating applied to a cobalt-base superalloy

被引：0

作者：

Yuan, F.H. ^{[1
]}

Sun, X.F. ^{[1
]}

Guan, H.R. ^{[1
]}

Hu, Z.Q. ^{[1
]}

机构：

[1] Department of Superalloys, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China

来源：

International Journal of Materials and Product Technology | 2001年 / SPEC ISS. VOL.2期

关键词：

Chemical vapor deposition - Cobalt - Corrosion resistance - Oxidation - Superalloys;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

A kind of aluminide coating obtained by the low pressure chemical vapor deposition process was applied to K40S, a cobalt-base superalloy used in vane application. The coating consists largely of CoAl phase. The interlayer between the coating and substrate is chromium rich M23C6 carbide containing some tungsten and cobalt. The coating not only improved the hot corrosion resistance of K40S alloy, but also decreased its high temperature oxidation rate, thereby increasing remarkably the oxide scale adherence to underlying aluminide coating. The initial oxide scale was Al2O3. An oxide mixture of Al2O3, Cr2O3 and spinel CoCr2O4 was developed afterwards and accompanied the gradual dissolution of CoAl phase due to Al depletion.

引用

页码：835 / 840