Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Characterization of Ni-YSZ cermet anode for SOFC prepared by glycine nitrate process

Glycine nitrate process에 의한 제조된 SOFC anode용 Ni-YSZ cermet의 물성

  • Lee, Tae-Suk (Department of Materials Engineering, Korea Maritime University) ;
  • Ko, Jung-Hoon (Department of Hydrogen and Fuel Cells Engineering, Specialized Graduate School, Chonbuk National University) ;
  • Lee, Kang-Sik (Division of Advanced materials Engineering, Hydrogen & Fuel Cells Research Center Chonbuk National University) ;
  • Kim, Bok-Hee (Department of Hydrogen and Fuel Cells Engineering, Specialized Graduate School, Chonbuk National University)
  • 이태석 (한국해양대학교 재료공학과) ;
  • 고정훈 (전북대학교 수소연료전지 특성화 대학원) ;
  • 이강식 (전북대학교 재료공학과) ;
  • 김복희 (전북대학교 수소연료전지 특성화 대학원)
  • Received : 2010.11.15
  • Accepted : 2011.02.11
  • Published : 2011.02.28
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Abstract

Ni-YSZ (Yttria Stabilized Zirconia) composite powders were fabricated by glycine nitrate process. The prepared powders were sintered at $1300{\sim}1400^{\circ}C$ for 4 h in air and reduced at $1000^{\circ}C$ for 2 h in a nitrogen and hydrogen atmosphere. The microstructure, electrical conductivity, thermal expansion and mechanical properties of the Ni-YSZ cermets have been investigated with respect to the volume contents of Ni. A porous microstructure consisting of homogeneously distributed Ni and YSZ phases together with well-connected grains was observed. It was found that the open porosity, electrical conductivity, thermal expansion and bending strength of the cermets are sensitive to the volume content of Ni. The Ni-YSZ cermet containing 40 vol% Ni was ascertained to be the optimum composition. This composition offers sufficient open porosity of more than 30 %, superior electrical conductivities of 917.4 S/cm at $1000^{\circ}C$ and a moderate average thermal expansion coefficient of $12.6{\times}10^{-6}^{\circ}C^{-1}$ between room temperature and $1000^{\circ}C$.

Ni-YSZ(Yttria Stabilized Zirconia) composite powders를 glycine nitrate process으로 만들었다. 합성된 분말은 $1300{\sim}1400^{\circ}C$ 4시간 동안 소성하였으며 $1000^{\circ}C$에서 2시간 동안 질소 및 수소 분위기에서 환원 소성하여 Ni-YSZ cermet을 제조하였다. Ni의 부피비를 변화 시켜 각기 그들의 미세구조, 전기전도도, 열팽창 및 강도 특성을 알아보았다. Ni과 YSZ 상 사이에 상호 연결된 균질하게 분포된 다공성 미세구조를 얻을 수 있었다. 기공률, 전기전도도, 열팽창계수 및 곡강도 모두 Ni의 양에 민감하게 영향 받는 것을 알 수 있으며 40 vol%의 Ni를 함유한 Ni-YSZ cermet가 전극재료로 가장 적당하였다. $1350^{\circ}C$에서 소성한 40 vol% Ni-YSZ 시편의 경우 30 %의 기공율, 65.5 Mpa의 강도, 917.4 S/cm의 전기 전도도($1000^{\circ}C$)및 $12.6{\times}10^{-6}^{\circ}C^{-1}$의 열팽창계수($1000^{\circ}C$)를 가져 YSZ 전해질의 음극재료로 가장 적합하였다.

Keywords

References

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