水基凝胶注YSZ固体电解质薄膜干燥过程研究

Drying Process of YSZ Solid Electrolyte Film by Aqueous Gel-Casting

用水基凝胶注法制备出YSZ固体电解质薄膜 ,研究了温度、湿度和坯体厚度对干燥过程的影响规律。结果表明温度和湿度对干燥失重速率的影响比坯体厚度的影响大 ,温度越高 ,湿度越小 ,坯体厚度越小 ,YSZ薄膜失重速率越大。同时利用物理机制对干燥过程进行了解释 ,验证了YSZ薄膜的干燥过程分为明显的三个阶段 ,而且第一阶段干燥速率明显高于第二、第三阶段的干燥速率 ,第三阶段干燥速率受外界条件影响相对较小。对于厚度为 0 1mm的YSZ薄膜 ,选择 40℃和RH =60 %的干燥工艺 ,效果最佳。

YSZ solid electrolyte film was prepared by aqueous gel casting. The influences of temperature, relative humidity and sample thickness on drying process were studied. The research results show that temperature and relative humidity are more important during drying process, and the drying rate could be maximized at high drying, potential conditions of high dryer temperature, low humidity and little thickness. Meanwhile drying process was explained using the physical mechanism. Three stages were proved in the drying process of YSZ gels, and the drying rate of first stage is the fastest. Effects of drying conditions on the third drying stage are relatively weak. experiment parameters are optimized to 40 ℃ and 60% RH for samples with thickness of 0.1 mm.