水和乙醇悬浮液等离子喷涂SOFC电解质层的工艺及涂层特点比较

选用水和乙醇两种溶剂配置悬浮液,研究了分散剂PAA含量对(Ce0.80Gd0.20)O1.9(GDC)悬浮液粘度的影响和pH值对GDC颗粒Zeta电位的影响。采用固相质量分数为10%的GDC悬浮液等离子喷涂制备固体氧化物燃料电池电解质层。利用X射线衍射、扫描电镜和电子探针分别分析了喷涂前后GDC的相结构、电解质层微观组织及化学成分。研究结果表明:水悬浮液优化参数PAA质量分数为2.5%,pH=10;乙醇悬浮液优化参数为:PAA质量分数为2.0%,pH=10。在相同喷涂工艺下,乙醇悬浮液得到的电解质层结构更精细,由图像分析法得水和乙醇悬浮液得到电解质层的孔隙率分别为5.64%和1.25%。GDC喷涂前后没有相结构的变化,但是晶粒有长大,并且在喷涂过程中氧化铈发生烧损,水和乙醇悬浮液制备的电解质层中氧化铈分别烧损了15.8%和16.8%。

Comparision of the Process and Characteristics of Electrolytic Layers for SOFC by Water and Alcohol Based Suspension Plasma Spraying

The effect of dispersant PAA loadings on the(Ce0.80Gd0.20)O1.9(GDC) suspension viscosities and the influence of pH value on the GDC particles Zeta potential were investigated.The two kinds of suspensions were prepared by using deionized water and alcohol as solvent.GDC electrolytic layers for SOFC were obtained by suspension plasma spraying with 10% solid content.X-ray diffractometry,scanning electron microscopy and electron probe microanalysis were used to analyse the phase structure,the cross-section micr...