ON THE OXIDATION MECHANISM OF ALUMINA FORMERS

被引：86

作者：

JEDLINSKI, J

BORCHARDT, G

机构：

[1] Fachbereich Metallurgie und Werkstoffwissenschaften, Technische Universität Clausthal, Clausthal-Zellerfeld, D-3392

来源：

OXIDATION OF METALS | 1991年 / 36卷 / 3-4期

关键词：

BETA-NIAL; FE-CR-AL ALLOYS; ALUMINA FORMERS; REACTIVE ELEMENT EFFECT; OXIDATION MECHANISM;

D O I：

10.1007/BF00662968

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The oxidation mechanism of the intermetallic compound beta-NiAl and Fe-23 Cr-5 Al-0.2Zr alloys modified by reactive-element additions was studied in the temperature range 1273-1473 K by means of the two-stage oxidation method using the oxygen isotope O-18 as a tracer. It was found that outward cation diffusion predominates in the scale on beta-NiAl. The contribution of the inward oxygen transport increased with increased reaction temperature and oxidation time. At 1473 K, implanted yttrium suppressed inward oxygen diffusion for oxidation times less than 1 hr. In the case of Fe-Cr-Al-Zr alloys the counter-current transport of reactants was observed on the non-implanted materials. Implanted yttrium was found to alter the transport mechanism. This effect appeared to be directly related to that of yttrium on the scale morphology and microstructure. Yttrium promoted the formation of cracks which provided an additional surface for the reaction.

引用

页码：317 / 337

页数：21

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