다공성 (Ca,Mg)0.15Zr0.7O1.7 세라믹스의 제조 및 특성
Preparation and properties of porous (Ca,Mg)0.15Zr0.7O1.7 ceramics
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다공성 (Ca,Mg)0.15Zr0.7O1.7 세라믹스를 제조하고 기공률 및 기계적 강도를 측정하여 SOFC 세라믹 지지체로서응용 가능성을 조사하였다. 출발물질로 ZrO(NO3)2 · 2H2O를 선정하고 이를 이온 교환수에 용해하여 glycine을 첨가하여glycine 연소법으로 ZrO2 분말을 합성하고 800oC에서 하소하여 ZrO2 원으로 사용하였다. 합성한 ZrO2 분말, dolomite, 그리고 pore former로 carbon black을 혼합하고 1200~1400oC로 소성하여 다공성 (Ca,Mg)0.15Zr0.7O1.7 세라믹스 소결체를 제조하였다. (Ca,Mg)0.15Zr0.7O1.7 세라믹스의 결정상은 단일상의 cubic상이었다. 1300oC에서 소성한 (Ca,Mg)0.15Zr0.7O1.7 세라믹 소결체는 carbon black의 양이 증가할수록 기공률이 32 %에서 55 %까지 증가하였으며 기계적 강도는 90 MPa로부터 30 MPa까지감소하였다.
Abstract
(Ca,Mg)0.15Zr0.7O1.7 ceramics was investigated for the application to SOFC ceramic supporter with high porosity and mechanical strength. ZrO2 powder was prepared by combustion method with glycine using the solution of ZrO(NO3)2 ·2H2O dissolved into deionized water and calcination at 800oC. Porous (Ca,Mg)0.15Zr0.7O1.7 ceramics was prepared by sintering the mixture of prepared ZrO2 powder, dolomite and carbon black at 1200~1400oC for 1 h. The open porosity of the (Ca,Mg)0.15Zr0.7O1.7 ceramics sintered at 1300oC was over 30 % and increased linearly with the amount of carbon black. The crystal structure of (Ca,Mg)0.15Zr0.7O1.7 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 1300oC showed the porosity from 32to 55 % and mechanical strength from 90 MPa to 30 MPa with increasing the content of added carbon black.
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