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首页> 外文期刊>CERAMICS INTERNATIONAL >Improving sealing properties of CaO-SrO-Al2O3-SiO2 glass and glass-ceramics for solid oxide fuel cells: Effect of La2O3 addition
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Improving sealing properties of CaO-SrO-Al2O3-SiO2 glass and glass-ceramics for solid oxide fuel cells: Effect of La2O3 addition

机译：改善CaO-SrO-Al2O3-SiO2玻璃和玻璃陶瓷的密封性能，用于固体氧化物燃料电池：La2O3添加的影响

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The La2O3-doped CaO-SrO-Al2O3-SiO2 glasses were prepared by the melting method. The main IR absorption peaks shift to the low wavenumber direction after the introduction of La2O3, which indicates that the amount of non-bridged oxygen in the glasses increases and the glass network depolarizes. With the increase of La2O3 content, the micro-hardness, glass transition temperature, and crystallization temperature show an increasing trend. The mass loss of acid and alkali resistance is less than 0.5 wt%, which does not affect the sealing effect of the fuel cells. The glasses were nucleated at 850 degrees C for 2 h and crystallized at 1050 degrees C for 1 h. The precipitated crystal phases of the glass-ceramics were mainly composed of SrAl2Si2O8, Ca2Al2SiO7, and CaSrAl2SiO7. As the amount of La2O3 reaches 2.5 mol%, the new crystal phase Ca3La6(SiO4)(6) appears in the glass-ceramic. Ca3La6 (SiO4)(6) crystals liberate much more SiO2 (in comparison to other crystals) leaving Al2O3 on the border that can results in CTE increase since Al2O3 has a significantly higher CTE in compare to SiO2. The CTE of the glass-ceramics varies within the range of 9.3-11.3 +/- 0.1 x 10(-6) degrees C-1. Generally, the La2O3-doped 25CaO-20SrO-10Al(2)O(3)-45SiO(2) sealing glasses have the thermal expansion coefficients similar to that of other SOFCs components.
机译：通过熔融法制制备La2O3掺杂的CaO-SRO-AL2O3-SiO 2玻璃。在引入La2O3之后，主要的IR吸收峰值转移到低波数方向，这表明眼镜中的非桥接氧的量增加，并且玻璃网络去极化。随着LA2O3含量的增加，微硬度，玻璃化转变温度和结晶温度显示出较大的趋势。酸和碱性抗性的质量损失小于0.5wt％，其不会影响燃料电池的密封效果。将玻璃在850℃下核成2小时，并在1050℃下结晶1小时。玻璃陶瓷的沉淀晶相主要由Sall2Si2O8，Ca2Al2SiO7和Cassral2SiO7组成。随着LA2O3的量达到2.5摩尔％，新的晶体相Ca 3la6（SiO 4）（6）出现在玻璃陶瓷中。 Ca 3la6（SiO 4）（6）晶体释放得越多的SiO 2（与其他晶体相比），将Al2O3留在可以导致CTE增加的边界，因为Al2O3与SiO 2相比具有显着更高的CTE。玻璃陶瓷的CTE在9.3-11.3 +/- 0.1×10（-6）℃-1的范围内。通常，La2O3掺杂的25caO-20sro-10Al（2）O（3）-45SiO（2）密封玻璃具有与其他SOFC组件类似的热膨胀系数。

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