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Microstructural Characteristics of Ni/YSZ Cermet for High Temperature Electrolysis by Mechanical Alloying

기계적 합금화법으로 제조된 고온 수전해용 Ni/YSZ 전극의 미세구조 특성

  • Park Keun-Man (Plant Engineering Center, Institute for Advanced Engineering (IAE)) ;
  • Chae Ui-Seok (Plant Engineering Center, Institute for Advanced Engineering (IAE)) ;
  • Hong Hyun Seon (Plant Engineering Center, Institute for Advanced Engineering (IAE)) ;
  • Choo Soo-Tae (Plant Engineering Center, Institute for Advanced Engineering (IAE))
  • 박근만 (고등기술연구원 플랜트엔지니어링센터) ;
  • 채의석 (고등기술연구원 플랜트엔지니어링센터) ;
  • 홍현선 (고등기술연구원 플랜트엔지니어링센터) ;
  • 추수태 (고등기술연구원 플랜트엔지니어링센터)
  • Published : 2004.10.01

Abstract

Modified Ni/YSZ cermets for high temperature electrolysis were synthesized by the direct ball milling of Ni and YSZ powder. The ball milling was carried out in dry process and in ethanol with varying milling time. While the dry-milling decreased the average size from 65 to $80{\mu}m$, the wet-milling decreased the average size down to $10{\mu}m$. In addition, very fine particles less than $0.1{\mu}m$ were observed in the wet-milling condition. The subsequent process of cold-pressing and sintering at $900^{\circ}C$ for 2 h did not affect the particle size of dry-milled powder. The electrical conductivity of the dry-milled Ni/YSZ cermet showed the value of $5{\times}10^{2}\;S/cm$ and this value was increased to $1.4{\times}10^{4}\;S/cm$ after the sintering at $900^{\circ}C$ for 2 h.

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