Al₂O₃ ceramic was added to a CaO–B₂O₃–Al₂O₃–SiO₂ glass system to improve mechanical properties and thermal cycle stability in solid oxide fuel cell composite seals. The performance of glass-based seals with different Al₂O₃ content was evaluated, including the shear strength and leakage rate of the composite seals. The results showed that HA80 composite seal, with 20 wt% Al₂O₃, had excellent joint strength and gas tightness. HA80 had the highest shear strength among specimens, reaching 3.83 MPa after heat treatment at 750 °C. Gas tightness was greatly improved by using HA80 composite seals, with leakage rates from 0.0007 sccm/cm to 0.0011 sccm/cm corresponding to gas input pressures varying from 13.6 to 68 kPa. The leakage rates remained stable about 0.0022 sccm/cm at the highest gas input pressure (68 kPa) during twenty thermal cycles because of improved interfacial bonding between the composite seals and adjacent components. The 5-cell stack was assembled and achieved an open circuit voltage of 5.78 V and maximum power output of 354 W at 750 °C, demonstrating that HA80 composite seal was suitable for SOFC application.

将Al ₂ O ₃陶瓷添加到CaO–B ₂ O ₃ –Al ₂ O ₃ –SiO ₂玻璃系统中，以改善固体氧化物燃料电池复合密封件的机械性能和热循环稳定性。评价了具有不同Al ₂ O ₃含量的玻璃基密封件的性能，包括复合密封件的剪切强度和泄漏率。结果表明，采用80 wt％Al ₂ O _3的HA80复合密封件，具有出色的接头强度和气密性。HA80具有最高的剪切强度，在750°C热处理后达到3.83 MPa。通过使用HA80复合密封件，气密性得到了极大的改善，泄漏率从0.0007 sccm / cm到0.0011 sccm / cm，对应于从13.6到68 kPa的气体输入压力。在20个热循环中，在最高气体输入压力（68 kPa）下，由于复合密封件与相邻组件之间的界面粘结得到了改进，因此泄漏率保持稳定在0.0022 sccm / cm左右。组装了5单元电池堆，在750°C时实现了5.78 V的开路电压和354 W的最大功率输出，表明HA80复合密封垫适用于SOFC应用。