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高孔隙率YSZ-高致密YSZ薄膜共烧复合体的制备

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Abstract:

在中温固体氧化物燃料单电池制备过程中,用聚乙烯吡咯烷酮包裹改性的石墨粉体为造孔剂,以8%(摩尔分数)Y2O3稳定的ZrO2(8%inmoleyttriastabilizedzirconia,YSZ)粉体+石墨造孔剂为支撑层原料,与自制的水系流延YSZ电解质薄膜一起共压,制备了YSZ+石墨-YSZ薄膜复合体,在1470℃下共烧4h后获得高孔隙率YSZ-高致密YSZ薄膜共烧复合体。研究了不同溶剂体系中石墨含量和粒度对共烧体的影响。结果表明选用粒径为6μm以下的石墨粉体作造孔剂能获得无开裂的多孔YSZ-YSZ薄膜共烧体,其共烧体为双层结构,层间结合紧密、结构均匀,孔隙率高达68%(体积分数)。在造孔剂的含量变化与材料烧成收缩率的关系中,造孔剂含量存在1个最佳含量值,当造孔剂含量在最佳值附近时,制备的共烧复合体质量最好。该最佳含量值随造孔剂颗粒尺寸大小不同而变化。

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