Effect of grain boundaries on the formation of oxide scale in Fe-Cr alloy for SOFCs

Teruhisa Horita; Haruo Kishimoto; Katsuhiko Yamaji; Yueping Xiong; Natsuko Sakai; Manuel E. Brito; Harumi Yokokawa

doi:10.1016/j.ssi.2008.01.090

Effect of grain boundaries on the formation of oxide scale in Fe-Cr alloy for SOFCs

Teruhisa Horita^*
, Haruo Kishimoto
, Katsuhiko Yamaji
, Yueping Xiong
, Natsuko Sakai
, Manuel E. Brito
, Harumi Yokokawa

^*Corresponding author for this work

National Institute of Advanced Industrial Science and Technology

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

The effect of grain boundaries on the formation of oxide scale was investigated for two different Fe-Cr alloys at 1073 K in H₂-H₂O atmosphere: typical stainless steel (SUS430) and Laves-phase forming Fe-Cr alloy. Identified oxide scale phases were Cr-Mn-(Fe) spinel and Cr₂O₃ on both surfaces of the Fe-Cr alloys. A relatively fast diffusion of elements was observed at the grain boundaries of SUS430 with a formation of ridges on the oxide scale surface. On the other hand, the diffusion of elements was controlled by precipitating a Laves-phase (Fe₂(Nb, Mo) phase) at the alloy grain boundaries in the Laves-phase forming alloy. The oxide scale growth rates of the Laves-phase forming alloy was 9.8 × 10^{- 15} cm² s^{- 1}, which was much smaller than that of SUS430 (4.5 × 10^{- 14} cm² s^{- 1}) in the same condition. This was due to the lower diffusivity of elements at the grain boundaries of alloy. The control of elemental diffusivity at the alloy grain boundary (Laves-phase forming alloy) is effective to form stable and thin oxide scales on the Fe-Cr alloy surface in H₂-H₂O.

Original language	English
Pages (from-to)	1320-1324
Number of pages	5
Journal	Solid State Ionics
Volume	179
Issue number	27-32
DOIs	https://doi.org/10.1016/j.ssi.2008.01.090
State	Published - 30 Sep 2008
Externally published	Yes

Keywords

Fe-Cr alloy
Grain boundary
Interconnect
Oxide scale
Solid oxide fuel cells (SOFCs)

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10.1016/j.ssi.2008.01.090

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@article{c33c3797d53644c98ed60c6e1f56bfb7,

title = "Effect of grain boundaries on the formation of oxide scale in Fe-Cr alloy for SOFCs",

abstract = "The effect of grain boundaries on the formation of oxide scale was investigated for two different Fe-Cr alloys at 1073 K in H2-H2O atmosphere: typical stainless steel (SUS430) and Laves-phase forming Fe-Cr alloy. Identified oxide scale phases were Cr-Mn-(Fe) spinel and Cr2O3 on both surfaces of the Fe-Cr alloys. A relatively fast diffusion of elements was observed at the grain boundaries of SUS430 with a formation of ridges on the oxide scale surface. On the other hand, the diffusion of elements was controlled by precipitating a Laves-phase (Fe2(Nb, Mo) phase) at the alloy grain boundaries in the Laves-phase forming alloy. The oxide scale growth rates of the Laves-phase forming alloy was 9.8 × 10- 15 cm2 s- 1, which was much smaller than that of SUS430 (4.5 × 10- 14 cm2 s- 1) in the same condition. This was due to the lower diffusivity of elements at the grain boundaries of alloy. The control of elemental diffusivity at the alloy grain boundary (Laves-phase forming alloy) is effective to form stable and thin oxide scales on the Fe-Cr alloy surface in H2-H2O.",

keywords = "Fe-Cr alloy, Grain boundary, Interconnect, Oxide scale, Solid oxide fuel cells (SOFCs)",

author = "Teruhisa Horita and Haruo Kishimoto and Katsuhiko Yamaji and Yueping Xiong and Natsuko Sakai and Brito, \{Manuel E.\} and Harumi Yokokawa",

year = "2008",

month = sep,

day = "30",

doi = "10.1016/j.ssi.2008.01.090",

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pages = "1320--1324",

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TY - JOUR

T1 - Effect of grain boundaries on the formation of oxide scale in Fe-Cr alloy for SOFCs

AU - Horita, Teruhisa

AU - Kishimoto, Haruo

AU - Yamaji, Katsuhiko

AU - Xiong, Yueping

AU - Sakai, Natsuko

AU - Brito, Manuel E.

AU - Yokokawa, Harumi

PY - 2008/9/30

Y1 - 2008/9/30

N2 - The effect of grain boundaries on the formation of oxide scale was investigated for two different Fe-Cr alloys at 1073 K in H2-H2O atmosphere: typical stainless steel (SUS430) and Laves-phase forming Fe-Cr alloy. Identified oxide scale phases were Cr-Mn-(Fe) spinel and Cr2O3 on both surfaces of the Fe-Cr alloys. A relatively fast diffusion of elements was observed at the grain boundaries of SUS430 with a formation of ridges on the oxide scale surface. On the other hand, the diffusion of elements was controlled by precipitating a Laves-phase (Fe2(Nb, Mo) phase) at the alloy grain boundaries in the Laves-phase forming alloy. The oxide scale growth rates of the Laves-phase forming alloy was 9.8 × 10- 15 cm2 s- 1, which was much smaller than that of SUS430 (4.5 × 10- 14 cm2 s- 1) in the same condition. This was due to the lower diffusivity of elements at the grain boundaries of alloy. The control of elemental diffusivity at the alloy grain boundary (Laves-phase forming alloy) is effective to form stable and thin oxide scales on the Fe-Cr alloy surface in H2-H2O.

AB - The effect of grain boundaries on the formation of oxide scale was investigated for two different Fe-Cr alloys at 1073 K in H2-H2O atmosphere: typical stainless steel (SUS430) and Laves-phase forming Fe-Cr alloy. Identified oxide scale phases were Cr-Mn-(Fe) spinel and Cr2O3 on both surfaces of the Fe-Cr alloys. A relatively fast diffusion of elements was observed at the grain boundaries of SUS430 with a formation of ridges on the oxide scale surface. On the other hand, the diffusion of elements was controlled by precipitating a Laves-phase (Fe2(Nb, Mo) phase) at the alloy grain boundaries in the Laves-phase forming alloy. The oxide scale growth rates of the Laves-phase forming alloy was 9.8 × 10- 15 cm2 s- 1, which was much smaller than that of SUS430 (4.5 × 10- 14 cm2 s- 1) in the same condition. This was due to the lower diffusivity of elements at the grain boundaries of alloy. The control of elemental diffusivity at the alloy grain boundary (Laves-phase forming alloy) is effective to form stable and thin oxide scales on the Fe-Cr alloy surface in H2-H2O.

KW - Fe-Cr alloy

KW - Grain boundary

KW - Interconnect

KW - Oxide scale

KW - Solid oxide fuel cells (SOFCs)

UR - https://www.scopus.com/pages/publications/48349092432

U2 - 10.1016/j.ssi.2008.01.090

DO - 10.1016/j.ssi.2008.01.090

M3 - 文章

AN - SCOPUS:48349092432

SN - 0167-2738

VL - 179

SP - 1320

EP - 1324

JO - Solid State Ionics

JF - Solid State Ionics

IS - 27-32

ER -

Effect of grain boundaries on the formation of oxide scale in Fe-Cr alloy for SOFCs

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Keywords

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