摘要
研究了Mg O-Mg Al2O4复相陶瓷的组分变化及添加剂对烧结性能、力学性能以及热性能的影响。结果表明:当Al2O3含量为20%时,Mg O-Mg Al2O4复相陶瓷与固体氧化物燃料电池阳极支撑材料Ni O/YSZ的热膨胀系数一致;复合添加剂Ca O/Si O2可提高材料的烧结性能、力学性能以及热性能,但其添加量对各性能的影响有所不同:当Ca O/Si O2含量为2%时,气孔率最低,抗弯强度最高;当Ca O/Si O2含量为8%时,抗热震指数达到最高值;添加剂的含量对材料的热膨胀系数没有明显影响。选取Al2O3含量为20%、Ca O/Si O2添加量为6%的复相陶瓷与Ni O/YSZ粘接成实验组合构件,该组合件经600℃热震温差20次空冷循环,结合状态和强度无明显变化。
The effects of the component of MgO-MgAl2O4 composite ceramic and the additive on the sintering, mechanical and thermal properties were investigated. The results show that the thermal expansion coefficient of the MgO-MgAl2O4 composite ceramic is the same as that of the anode-supported solid oxide fuel cell （SOFC） material--NiO/YSZ at Al2O3 content of 20%. The compound additives can improve the sintering, mechanical and thermal properties. When the mass ratio of CaO/SiO2 is 2%, the specimen has the lowest porosity and the highest flexural strength. However, the optimal thermal shock resistance occurs at the mass ratio of CaO/SiO2 of 8%. The thermal expansion coefficient of MgO-MgAl2O4 composite ceramic is not related to the addition of CaO/SiO2. There is little difference between the bond condition and the strength of the composite member with a content of 20% Al2O3 and 6% CaO/SiO2 after 20 times of air cooling circulation at 600 ℃ in the presence of NiO/YSZ.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第9期1266-1270,共5页
Journal of The Chinese Ceramic Society
基金
长江学者和创新团队发展计划(PCSIRT
IRT1146)
江苏高校优势学科建设工程项目(PAPD)资助
关键词
方镁石-镁铝尖晶石
结构材料
固体氧化物燃料电池
热膨胀系数
periclase-magnesium aluminate spinel
structural materials
solid oxide fuel cell
thermal expansion coefficient
