摘要
通过凝胶浇注法制备了Al2O3掺杂0～3%(按质量计)的Ce0.8Sm0.2O1.9(samarium doped ceria,SDC)粉体.对所得粉体的相组成和粒度等进行了测定.粉体经模压成形,生坯在1 350～1 450℃烧结5 h,制成Al2O3-SDC固体电解质材料,对该材料样品的密度、微结构、电导率及抗弯强度等进行了测试分析.试验结果表明:掺入适量的Al2O3,所得Al2O3-SDC粉体具有良好的烧结性能,并能使Ce0.8Sm0.2O1.9粉体保持立方萤石结构,其烧结样品具有较高电导率,并且力学性能明显提高.未添加和添加1.0%Al2O3的SDC材料在600℃的电导率分别为0.28 S/cm和0.030 S/cm;室温抗弯强度分别为89.3 MPa和109.7 MPa.
Ce0.8Sm0.2O1.9（samarium doped ceria, SDC）powders doped with 0 to 3M in mass Al2O3 were prepared by the gelcasting process. The phase constitution, particle size and shape of the powders were characterized by X-ray diffraction and transmission electron microscopy. Al2O3- SDC samples were prepared by sintering at 1 350 to 1 450℃ for 5 h after mold pressing. The density, electrical conductivity and bending strength of the sintered Al2O3-SDC samples with different doping contents of Al2O3 were tested. The results show that the appropriate addition of Al2O3 can improve the sinterability of SDC powders, without changing their cubic fluorite structure. Furthermore, sintered Al2O3-SDC has higher electrical conductivity and greatly improved mechanical properties. The electrical conductivity at 600℃ is 0. 030 S/cm with 1.0% Al2O3 added and 0. 028 S/cm without Al2O3added, and the bending strength at room temperature is 109.7 MPa with 1.0% Al2O3 added and 89. 7 MPa without Al2O3 added.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2005年第9期1049-1053,共5页
Journal of The Chinese Ceramic Society
基金
国家"863"计划(2001AA323090)
合肥工业大学中青年创新群体基金(103037016)资助项目
关键词
钐掺杂氧化铈电解质
氧化铝
烧结行为
电导率
抗弯强度
samarium doped ceria electrolytes
alumina
sintering behavior
electrical conductivity
bending strength Abstract： Ceo.3Sm0.zOi. 9（samarium doped ceria, SDC）powders doped with 0 to 3~ in mass A1203 were prepared by the gel-casting process. The phase constitution, particle size and shape of the powders were characterized by X-ray diffraction andtransmission electron microscopy. AI2 O3- SDC samples were prepared by sintering at 1 350 to 1 450 ~C for 5 h after moldpressing. The density, electrical conductivity and bending strength of the sintered A1203-SDC samples with different dopingcontents of A1203 were tested. The results show that the appropriate addition of Al2 03 can improve the sinterability of SDCpowders, without changing their cubic fluorite structure. Furthermore, sintered AI2 O3-SDC has higher electrical conductivityand greatly improved mechanical properties. The electrical conductivity at 600 ~C is 0. 030 S/cm with 1.0Y00 AI2 03 added and0. 028 S/cm without AlzO3added, and the bending strength at room temperature is 109.7 MPa with 1. O~ A12（）3 added and89. 7 MPa without A1203 added.
