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

The Korea Association of Crystal Growth (한국결정성장학회)
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Preparation and properties of porous (Ca,Mg)0.15Zr0.7O1.7 ceramics

다공성 (Ca,Mg)0.15Zr0.7O1.7 세라믹스의 제조 및 특성

  • Kim, Bok-Hee (Hydrogen & Fuel Cell Research Center, Chonbuk National University) ;
  • Kim, Sang-Hee (Division of Hydrogen and Fuel Cell Engineering, Chonbuk National University) ;
  • Choi, Eun-Sil (Hydrogen & Fuel Cell Research Center, Chonbuk National University)
  • 김복희 (전북대학교 재료공학과, 수소연료전지연구센터) ;
  • 김상희 (전북대학교 수소연료전지공학과) ;
  • 최은실 (전북대학교 재료공학과, 수소연료전지연구센터)
  • Received : 2011.02.08
  • Accepted : 2011.04.01
  • Published : 2011.04.30
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Abstract

[ $(Ca,Mg)_{0.15}Zr_{0.7}O_{1.7}$ ]ceramics was investigated for the application to SOFC ceramic supporter with high porosity and mechanical strength. $ZrO_2$ powder was prepared by combustion method with glycine using the solution of $ZrO(NO_3)_2{\cdot}2H_2O$ dissolved into deionized water and calcination at $800^{\circ}C$ Porous $(Ca,Mg)_{0.15}Zr_{0.7}O_{1.7}$ ceramics was prepared by sintering the mixture of prepared $ZrO_2$ powder, dolomite and carbon black at $1200{\sim}1400^{\circ}C$ for 1 h. The open porosity ofthe $(Ca,Mg)_{0.15}Zr_{0.7}O_{1.7}$ ceramics sintered at $1300^{\circ}C$ was over 30 % and increased linearly with the amount of carbon black. The crystal structure of $(Ca,Mg)_{0.15}Zr_{0.7}O_{1.7}$ ceramics consisted of single cubic phase. The open pore of this ceramics was connected continuously and distributed well on the whole. This ceramics sintered at $1300^{\circ}C$ showed the porosity from 32 to 55 % and mechanical strength from 90 MPa to 30 MPa with increasing the content of added carbon black.

다공성 $(Ca,Mg)_{0.15}Zr_{0.7}O_{1.7}$ 세라믹스를 제조하고 기공률 및 기계적 강도를 측정하여 SOFC 세라믹 지지체로서 응용 가능성을 조사하였다. 출발물질로 $ZrO(NO_3)_2{\cdot}2H_2O$를 선정하고 이를 이온 교환수에 용해하여 glycine을 첨가하여 glycine 연소법으로 $ZrO_2$ 분말을 합성하고 $800^{\circ}C$에서 하소하여 $ZrO_2$ 원으로 사용하였다. 합성한 $ZrO_2$ 분말, dolomite, 그리고 pore former로 carbon black을 혼합하고 $1200{\sim}1400^{\circ}C$로 소성하여 다공성 $(Ca,Mg)_{0.15}Zr_{0.7}O_{1.7}$ 세라믹스 소결체를 제조하였다. $(Ca,Mg)_{0.15}Zr_{0.7}O_{1.7}$ 세라믹스의 결정상은 단일상의 cubic상이었다. $1300^{\circ}C$ 에서 소성한 $(Ca,Mg)_{0.15}Zr_{0.7}O_{1.7}$ 세라믹 소결체는 carbon black의 양이 증가할수록 기공률이 32 %에서 55 %까지 증가하였으며 기계적 강도는 90 MPa로부터 30 MPa까지 감소하였다.

Keywords

References

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