摘要
运用熔融退火工艺制备CaO-BaO-Al_(2)O_(3)-B_(2)O_(3)-SiO_(2)(CS)中温固体氧化物燃料电池(IT-SOFC)封接玻璃,通过改变玻璃中Al_(2)O_(3)含量,使Si/Al比为10∶2、10∶3、10∶4与10∶5,分别命名为CS_(2)、CS_(3)、CS_(4)与CS_(5),以探究最优Si/Al比,从而获得热稳定好的IT-SOFC封接玻璃。差热分析结果表明,随着Si/Al比逐渐增加,CS_(4)封接玻璃的析晶倾向最低,而经过热处理后CS封接玻璃的X射线衍射峰强度的比较同样验证了这一点。结合在1073 K保温不同时间后CS玻璃的物相分析可知,CS4封接玻璃内析出的六方钡长石在1073 K热处理100 h后始终保持不变,而其他三种封接玻璃在一定程度上均呈现出六方钡长石向单斜钡长石的转变。通过进一步对CS_(4)热处理前后的平均热膨胀系数以及界面结合形貌可知,当Si/Al比为10∶4时,CS封接玻璃的热稳定性最高,利于实际封接。
The CaO-BaO-Al_(2)O_(3)-B_(2)O_(3)-SiO_(2)(CS)intermediate temperature solid oxide fuel cell(IT-SOFC)sealing glass has been prepared using melting annealing process.By changing the content of Al_(2)0_(3) in the glass,the Si/Al ratio is 10:2,10:3,10:4 and 10:5,respectively named CS_(2),CS_(3),CS_(4) and CS_(5) to explore the optimal Si/Al ratio to obtain IT-SOFC sealing glass with good thermal stability.The results of differential thermal analysis show that as the Si/Al ratio gradually increases,the crystallizing tendency of CS_(4) sealing glass is the lowest,which is also verified by the comparison of the X-ray diffraction peak intensity of CS sealing glass after heat treatment.Combining with the phase analysis of CS glass after holding at 1073 K for different times,it can be seen that the hexagonal barium feldspar precipitated in the CS_(4) sealing glass remains unchanged after heat treatment at 1073 K for 100 h,while the other three sealing glasses are uniform to a certain extent.It shows the transformation from hexagonal barium feldspar to monoclinic barium feldspar.By further analyzing the average thermal expansion coefficient before and after heat treatment and interface bonding morphology of CS_(4),it can be seen that when the Si/Al ratio is 10:4,the thermal stability of CS sealing glass is the highest,which is beneficial to actual sealing.
作者
徐利华
刘亮光
XU Lihua;LIU Liangguang(Wuxi Institute of Arts&Technology,Yixing 214206,China;Research and Development Center of Ceramic Material and Process Engineering in Jiangsu Province,Yixing 214206,China;HaiNan University,Haikou 570000,China)
出处
《中国陶瓷》
CAS
CSCD
北大核心
2021年第12期39-44,共6页
China Ceramics
基金
2020年度江苏高校自然科学研究面上项目(20KJB430028)。
