Influence of post-treatments on the contact resistance of plasma-sprayed La0.8Sr0.2MnO3 coating on SOFC metallic interconnector

D. P. Lim, Dae-Soon Lim, J. S. Oh, I. W. Lyo

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Lowering the cell operation temperature to the intermediate temperature range of 600-700 °C allows the use of cheaper and more conductive metallic interconnect materials instead of ceramics. Stainless steel is considered to be one of the most promising candidate materials owing to its adaptable thermal expansion coefficient and low price. However, its lifetime is limited owing to the insulating oxide scale which forms on the steel surface and the degradation of the cathode performance due to the vaporization of the chromia-containing oxide scale. In order to reduce the degradation of the cell performance, an effective protective layer needs to be developed. To this end, in this study, an LSM (La0.8Sr0.2MnO3) coating was deposited by the plasma spraying method. The solid-state reaction method was used to synthesize the LSM powders prior to the plasma spraying. Uniform and dense coatings of LSM were deposited on stainless steel by plasma spraying. The post surface treatment with plasma and thermal annealing was found to improve the crystallinity and porosity of the coating itself, but increased the contact resistance. The variation of the stoichiometry, degree of crystallinity and nature of the interface were investigated, in an attempt to explain the conductivity behavior of the plasma-sprayed LSM coating after post-treatment.

Original languageEnglish
Pages (from-to)1248-1251
Number of pages4
JournalSurface and Coatings Technology
Volume200
Issue number5-6
DOIs
Publication statusPublished - 2005 Nov 21

Fingerprint

sprayed coatings
plasma spraying
Plasma spraying
Sprayed coatings
Contact resistance
Solid oxide fuel cells (SOFC)
contact resistance
Stainless Steel
Plasmas
coatings
Coatings
Oxides
stainless steels
crystallinity
Stainless steel
Plasma Gases
degradation
Degradation
oxides
Steel

Keywords

  • Coatings
  • Plasma processing and deposition
  • Post-treatment
  • Solid oxide fuel cell (SOFC)

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Influence of post-treatments on the contact resistance of plasma-sprayed La0.8Sr0.2MnO3 coating on SOFC metallic interconnector. / Lim, D. P.; Lim, Dae-Soon; Oh, J. S.; Lyo, I. W.

In: Surface and Coatings Technology, Vol. 200, No. 5-6, 21.11.2005, p. 1248-1251.

Research output: Contribution to journalArticle

@article{6efea7632c9c4976be02a870613e4022,
title = "Influence of post-treatments on the contact resistance of plasma-sprayed La0.8Sr0.2MnO3 coating on SOFC metallic interconnector",
abstract = "Lowering the cell operation temperature to the intermediate temperature range of 600-700 °C allows the use of cheaper and more conductive metallic interconnect materials instead of ceramics. Stainless steel is considered to be one of the most promising candidate materials owing to its adaptable thermal expansion coefficient and low price. However, its lifetime is limited owing to the insulating oxide scale which forms on the steel surface and the degradation of the cathode performance due to the vaporization of the chromia-containing oxide scale. In order to reduce the degradation of the cell performance, an effective protective layer needs to be developed. To this end, in this study, an LSM (La0.8Sr0.2MnO3) coating was deposited by the plasma spraying method. The solid-state reaction method was used to synthesize the LSM powders prior to the plasma spraying. Uniform and dense coatings of LSM were deposited on stainless steel by plasma spraying. The post surface treatment with plasma and thermal annealing was found to improve the crystallinity and porosity of the coating itself, but increased the contact resistance. The variation of the stoichiometry, degree of crystallinity and nature of the interface were investigated, in an attempt to explain the conductivity behavior of the plasma-sprayed LSM coating after post-treatment.",
keywords = "Coatings, Plasma processing and deposition, Post-treatment, Solid oxide fuel cell (SOFC)",
author = "Lim, {D. P.} and Dae-Soon Lim and Oh, {J. S.} and Lyo, {I. W.}",
year = "2005",
month = "11",
day = "21",
doi = "10.1016/j.surfcoat.2005.08.131",
language = "English",
volume = "200",
pages = "1248--1251",
journal = "Surface and Coatings Technology",
issn = "0257-8972",
publisher = "Elsevier",
number = "5-6",

}

TY - JOUR

T1 - Influence of post-treatments on the contact resistance of plasma-sprayed La0.8Sr0.2MnO3 coating on SOFC metallic interconnector

AU - Lim, D. P.

AU - Lim, Dae-Soon

AU - Oh, J. S.

AU - Lyo, I. W.

PY - 2005/11/21

Y1 - 2005/11/21

N2 - Lowering the cell operation temperature to the intermediate temperature range of 600-700 °C allows the use of cheaper and more conductive metallic interconnect materials instead of ceramics. Stainless steel is considered to be one of the most promising candidate materials owing to its adaptable thermal expansion coefficient and low price. However, its lifetime is limited owing to the insulating oxide scale which forms on the steel surface and the degradation of the cathode performance due to the vaporization of the chromia-containing oxide scale. In order to reduce the degradation of the cell performance, an effective protective layer needs to be developed. To this end, in this study, an LSM (La0.8Sr0.2MnO3) coating was deposited by the plasma spraying method. The solid-state reaction method was used to synthesize the LSM powders prior to the plasma spraying. Uniform and dense coatings of LSM were deposited on stainless steel by plasma spraying. The post surface treatment with plasma and thermal annealing was found to improve the crystallinity and porosity of the coating itself, but increased the contact resistance. The variation of the stoichiometry, degree of crystallinity and nature of the interface were investigated, in an attempt to explain the conductivity behavior of the plasma-sprayed LSM coating after post-treatment.

AB - Lowering the cell operation temperature to the intermediate temperature range of 600-700 °C allows the use of cheaper and more conductive metallic interconnect materials instead of ceramics. Stainless steel is considered to be one of the most promising candidate materials owing to its adaptable thermal expansion coefficient and low price. However, its lifetime is limited owing to the insulating oxide scale which forms on the steel surface and the degradation of the cathode performance due to the vaporization of the chromia-containing oxide scale. In order to reduce the degradation of the cell performance, an effective protective layer needs to be developed. To this end, in this study, an LSM (La0.8Sr0.2MnO3) coating was deposited by the plasma spraying method. The solid-state reaction method was used to synthesize the LSM powders prior to the plasma spraying. Uniform and dense coatings of LSM were deposited on stainless steel by plasma spraying. The post surface treatment with plasma and thermal annealing was found to improve the crystallinity and porosity of the coating itself, but increased the contact resistance. The variation of the stoichiometry, degree of crystallinity and nature of the interface were investigated, in an attempt to explain the conductivity behavior of the plasma-sprayed LSM coating after post-treatment.

KW - Coatings

KW - Plasma processing and deposition

KW - Post-treatment

KW - Solid oxide fuel cell (SOFC)

UR - http://www.scopus.com/inward/record.url?scp=28844479485&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=28844479485&partnerID=8YFLogxK

U2 - 10.1016/j.surfcoat.2005.08.131

DO - 10.1016/j.surfcoat.2005.08.131

M3 - Article

AN - SCOPUS:28844479485

VL - 200

SP - 1248

EP - 1251

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

IS - 5-6

ER -