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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%in mole yttria stabilized zirconia,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1 470℃下共烧4 h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。
In the process of preparation of medium temperature solid oxide fuel cells, the modified graphite powder coated with polyvinylpyrrolidone was used as a pore-forming agent, and was characterized by 8% molar mole of Y2O3 stabilized zirconia (YSZ) Powder + graphite porogen for the support layer of raw materials, and homemade water-based cast YSZ electrolyte membrane co-pressure, prepared YSZ + graphite -YSZ film composite, co-firing at 470 ℃ 4 h after obtaining high porosity YSZ High Density YSZ Film Co-Burning Complex. The effects of graphite content and particle size on co-firing in different solvent systems were studied. The results show that the co-sintered porous YSZ-YSZ film can be obtained by using graphite powder with particle size below 6μm as pore-forming agent. The co-sintered body has a double-layer structure with compact layers and uniform structure with porosity up to 68% (volume fraction). In the relationship between the content of pore-forming agent and the shrinkage of the material, there is an optimum content of pore-forming agent. When the content of pore-forming agent is in the vicinity of the optimum value, the quality of the co- . The optimum content varies with pore size.