| 학회 | 한국재료학회 |
| 학술대회 | 2014년 봄 (05/15 ~ 05/16, 창원컨벤션센터) |
| 권호 | 20권 1호 |
| 발표분야 | C. 에너지/환경 재료(Energy and Environmental Materials) |
| 제목 | Influence of Ga2O3 additions to Ce0.8Y0.2O1.9 ceramics on sintering behavior and electrical conductivity |
| 초록 | Ceria-based ceramics have been considered as one of the most promising electrolytes for intermediate temperature solid oxide fuel cells. Among ceria-based ceramics, yttria-doped ceria is of particular interest because of its comparatively high electrical conductivity and the relative abundance and low cost of the yttrium element. However, yttria-doped ceria ceramics should be sintered over 1550℃ to be densifed. This makes them difficult for manufacturing ceria-based electrolytes which can be used for SOFC systems, because the ceria-based electrolytes and other components such as cathode and anode cannot be cofired at high temperatures. In order to lower the sintering temperature, other methods utilizing fine starting powders and additives as sintering aids have been exploited. The preparation of ultra fine yttria-doped ceria powders has been studied by many investigators. Most of the investigators have studied the preparation of ultra fine yttria-doped ceria powders via chemical routes such as coprecipitation, combustion synthesis and hydrothermal synthesis. In contrast, only a limited number of reports on the densification of yttria-doped ceria with sintering additives are available. The effects of zinc oxide addition on the sintering characteristics and electrical properties of yttria-doped ceria were investigated by Gao et al.. They reported that the addition of a small amount of ZnO strongly enhanced the densification kinetics. A ZnO addition of over 0.4 mol% led to a sintered density of 96% for sintering at 1375℃, which is about 200℃ lower than the sintering temperature required without ZnO. In the present work, the effects of Ga2O3 addition on the Y2O3-doped CeO2 system are studied systematically. We prepared Ce0.8Y0.2O1.9 ceramics with different Ga2O3 contents. Emphasis is especially placed on variations in the sintered density, microstructure and electrical conductivity. |
| 저자 | 이주신 |
| 소속 | 경성대 |
| 키워드 | yttria-doped ceria; Ga2O3 addition; sintering; electrical conductivity |
