各组分对SOFC硼酸盐封接玻璃系统的影响

摘要

The effects of barium oxide,divalent metal oxide and silicon-boron ratio on BaO-Al2O3-SiO2 sealing glass system were observed.BaO can make the structure of sealing glass looser and reduce its viscosity.With the BaO content increasing,the thermal expansion coefficient goes upward while the transition temperature Tg and the softening temperature Ts present an opposite trend.When the molar ratio of B2O3/SiO2 is 0.35,0.4,0.5,and 0.6,the TEC of the sealing glass decreases with the B2O3/SiO2 ratio increasing but the Tg and the Ts reduce significantly.But when the B2O3/SiO2 ratio is greater than 0.5,it will have little effect on the Tg and the Ts,and the dropping trend of Tg and Ts gradually levels off.Introducing RO (R=Ca,Zn)into the system will raise the Tg to a higher temperature,and it will also increase the crystallization temperature of the sealing glass,which is not desirable for long stability of the sealing glass.%以BaO-Al2O3-B2O3-SiO2封接玻璃体系为主要研究对象,研究氧化钡、二价金属氧化物和硼硅比等对封接玻璃系统的影响.BaO能使封接玻璃结构较疏松并降低其粘度,同时热膨胀系数随着BaO含量的增加呈上升的趋势,而封接玻璃转变温度Tg和软化温度Ts则随BaO含量的增加呈下降的趋势；B2O3/SiO2摩尔比分别为0.35、0.4、0.5和0.6时,封接玻璃的TEC随着B2O3/SiO2的增大而逐渐减小,Tg和Ts随着B2O3的增多而显著降低；但是当B2O3/SiO2比大于0.5时,比例对Tg和Ts的影响较小,Tg和Ts温度下降的趋势逐渐平缓下来；在体系中引入RO(R=Ca,Zn)会使封接玻璃的Tg朝高温方向偏移,同时也能使封接玻璃的析晶温度退后,但不利于封接玻璃的长期稳定性.