Effects of La2O3 content and particle size on the long-term stability and thermal cycling property of La2O3-dispersed SUS430 alloys for SOFC interconnect materials

Jung Won Lee, Muhammad Taqi Mehran, Rak Hyun Song, Seung Bok Lee, Jong Won Lee, Tak Hyoung Lim, Seok Joo Park, Jong Eun Hong, Joon Hyung Shim

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3 Citations (Scopus)

Abstract

We developed oxide-dispersed alloys as interconnect materials for a solid oxide fuel cell by adding La2O3 to SUS430 ferritic steels. For this purpose, we prepared two types of La2O3 with different particle sizes and added different amounts of La2O3 to SUS430 powder. Then, we mixed the powders using a high energy ball mill, so that nano-sized as well as micro-sized oxide particles were able to mix uniformly with the SUS430 powders. After preparing hexahedral green samples using uni-axial and cold isostatic presses, we were finally able to obtain oxide-dispersed alloys having high relative densities after firing at 1,400 °C under hydrogen atmosphere. The nano-sized La2O3 dispersed alloys showed properties superior to those of micro-sized dispersed alloys in terms of long-term stability and thermal cycling. Moreover, we determined the optimum amounts of added La2O3. Finally we were able to develop a new oxide-dispersed alloy showing excellent properties of low area specific resistance (16.23 mΩ cm2) after 1000 h at 800 °C, and no degradation after 10 iterations of thermal cycling under oxidizing atmosphere.

Original languageEnglish
Pages (from-to)1250-1256
Number of pages7
JournalMetals and Materials International
Volume23
Issue number6
DOIs
Publication statusPublished - 2017 Nov 1

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Keywords

  • fuel cells
  • metallic interconnects
  • oxidation
  • scanning electron microscopy (SEM)
  • sintering

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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