Glycine nitrate process에 의한 SOFC용 Ni-YSZ cermets 제조

Abstract

SOFC용 Ni-YSZ(Yttria Stabilized Zirconia) composite powders를 glycine nitrate process를 이용하여 만들었다. <TEX>$ZrO(NO_3)_2{\cdot}2H_2O$</TEX>, <TEX>$Y(NO_3)_3{\cdot}6H_2O$</TEX>, <TEX>$Ni(NO_3)_2{\cdot}6H_2O$</TEX>와 glycine을 출발원료로 하였으며 Ni의 부피비를 변화시켜 각기 그들의 소결 및 환원 특성을 알아보았다. Ni과 YSZ 상들이 상호 연결된 균질하게 분포된 다공성 미세구조를 관찰 할 수 있었으며 Ni의 첨가량에 따라 가공률이 민감하게 변화함을 알 수 있었다. 35 vol% 이상의 Ni를 함유한 Ni-YSZ cermet가 SOFC용 전극재료로 사용되는데 필요한 30% 이상의 공극을 갖는 조성임을 알 수 있었다. Ni-YSZ (Yttria Stabilized Zirconia) composite powders for SOFC were fabricated by glycine nitrate process. <TEX>$ZrO(NO_3)_2{\cdot}2H_2O$</TEX>, <TEX>$Y(NO_3)_3{\cdot}6H_2O$</TEX>, <TEX>$Ni(NO_3)_2{\cdot}6H_2O$</TEX> and glycine were chosen as the starting materials. The structural properties of the sintered 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. The sintered Ni-YSZ cermets showed a porous microstructure consists of homogeneously distributed Ni and YSZ phases and the grains were well-connected. It was found that the open porosity is sensitive to the volume content of Ni. The Ni-YSZ cermet containing 35 vol% Ni seems to be suitable for the electrode material of SOFC since it provides sufficient open porosity higher than 30%.