Effect of reactive element oxide inclusions on the growth kinetics of protective oxide scales

被引：81

作者：

Nijdam, T. J.

Sloof, W. G.

机构：

[1] Delft Univ Technol, Netherlands Inst Met Res, NL-2628 CD Delft, Netherlands

[2] Delft Univ Technol, Dept Mat Sci & Engn, NL-2628 CD Delft, Netherlands

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 17期

关键词：

modeling; oxidation; diffusion; alumina; MCrAIY bond coatings;

D O I：

10.1016/j.actamat.2007.07.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A model is presented for describing the growth kinetics of a protective oxide scale containing reactive element (RE) oxide inclusions (pegs). The formation of RE oxide inclusions due to dissolution and diffusion of the RE from intermetallic precipitates along grain or phase boundaries in the alloy is considered. The average oxide scale growth kinetics depend on the RE content, the parabolic rate constant of the protective oxide scale, the alloy grain/phase size and the size of the RE containing precipitates. The specimen thickness determines the amount of RE available for oxidation. If the RE in the alloy has been consumed completely, then the RE oxide inclusions attain a maximum size. After this point, a decrease in the average oxidation kinetics occurs. Very good agreement between experiments and calculations was obtained for the oxidation of a free-standing NiCoCrAlY coating at 1373 K. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5980 / 5987

页数：8

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