Oxide scale formation of Fe-Cr alloys and oxygen diffusion in the scale

被引：36

作者：

Horita, T ^{[1
]}

Yamaji, K ^{[1
]}

Xiong, YP ^{[1
]}

Kishimoto, H ^{[1
]}

Sakai, N ^{[1
]}

Yokokawa, H ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, AIST, Tsukuba, Ibaraki 3058565, Japan

来源：

SOLID STATE IONICS | 2004年 / 175卷 / 1-4期

关键词：

SOFC; Fe-Cr alloy; oxidation; oxide scales; SIMS; oxygen diffusion;

D O I：

10.1016/j.ssi.2004.09.045

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Oxide scales formed on an Fe-Cr alloy in fuel gas atmospheres (H-2-H2O and CH4-H2O) were investigated by secondary ion mass spectrometry (SIMS). From surface to oxide scale/alloy interfaces, Mn-Fe-(Cr) spinel, Cr2O3, SiO2, and Al2O3 inner oxides were identified by SEM and SIMS depth profiles. The elemental distribution analysis suggests that the grain boundary diffusion in the alloy plays an important role on growth of oxide scales. The growth of oxide scale followed the parabolic relationship between scale thickness and annealing duration time. The estimated growth rates of oxide scales are in an order of 10(-14) cm(2) s(-1) at 1073 K. Oxygen diffusion through the oxide scales were evaluated by 180 diffusion with SIMS analysis. The diffusion coefficients of O-18 in the oxide scales were 3.1-5.4 x 10(-12) cm(2) s(-1) at 1073 K. which were larger than the obtained growth rates of the oxide scales. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：157 / 163

页数：7

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