天然矿物制备IT-SOFC硼酸盐玻璃体系封接材料的研究

摘要

The glass ceramic sealant powder was prepared using natural glazing materials.XRD analysis shows that there is a small amount of SiO2 and BaAl2Si2O8 in the sealant.The results of AC impedance indicate that the resistivity decreases with the increasing temperature,the impedance values were between 104～105 Ω·cm2,and the insulating property is good.The activation energy is 101.2 kJ/mol calculated from the Arrhenius plot.The data of TECs is 10.34×10-6 K-1.The calculated leakage rates at 750℃ and 800℃ were 6.7×10-8mbar·l·s-1cm-1 and 8.2×10-8mbar·l·s-1cm-1,respectively.The investigation of wetting performance at high temperature shows that the glass ceramic sealant powder has good adhesion to YSZ electrolyte,which can prevent the dispersion of the sealant.The as-prepared sealing glass ceramics is suitable for SOFC applications.%以天然制釉原料制备了SO FC玻璃粉封接材料。X R D测试表明,封接材料中存在少量的SiO2相和BaAl2Si2O8相。阻抗测试表明,其电阻随温度升高而减小,阻抗值均在104～105Ω.cm2范围内,具有相当高的绝缘性能。从Arrhenius曲线求得相应的活化能为101.2kJ/m ol。热膨胀测试表明,其热膨胀系数（TEC）为10.34×10-6K-1。所封装的Y SZ气室在750℃和800℃的渗漏速率分别为6.6×10-8m bar.1.s-1cm-1和8.2×10-8m bar.1.s-1cm-1。高温浸润性研究表明,封接材料玻璃粉与电解质Y SZ具有良好的附着性并可防止封接材料出现的流散现象。所制备的封接材料玻璃粉达到了SO FC封接的要求。