Oxidation behavior of a single-crystal Ni-base superalloy in air -: II:: At 1000, 1100, and 1150°C

被引：82

作者：

Li, MH ^{[1
]}

Sun, XF ^{[1
]}

Jin, T ^{[1
]}

Guan, HR ^{[1
]}

Hu, ZQ ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China

来源：

OXIDATION OF METALS | 2003年 / 60卷 / 1-2期

关键词：

single-crystal Ni-base superalloy; oxidation; kinetics; microstructure;

D O I：

10.1023/A:1024629716452

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The oxidation behavior of a single-crystal (SC) Ni-base superalloy was studied over the temperature range from 1000-1150degrees C and analysed by TGA, XRD, EDAX, and SEM. The results indicated that the SC Ni-base superalloy exhibited parabolic oxidation kinetics, which were controlled by the growth of the inner alpha-Al2O3 layer. A mixed scale formed on the SC Ni-base superalloy after prolonged oxidation. The scale consisted of an outer layer of spinel, a sublayer of mainly alpha-Al2O3 with small amount of spinel adjoined by a very thin and even discontinuous layer of CrTaO4-rich oxide, and an inner alpha-Al2O3 layer. The inner alpha-Al2O3 layer provided good protection. No internal oxides or nitrides were observed below the inner alpha-Al2O3 layer after 1000 hr at 1000degrees C, and after 200 hr at 1100 and 1150degrees C.

引用

页码：195 / 210

页数：16

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