【摘要】 稀土钙钛矿型氧化物LaGaO3是固体氧化物燃料电池(SOFC)研制中具有应用前景的固体电解质材料,用固相反应法制备La0.85Sr0.15Ga0.85Mg0.15O2.85粉末,其水溶液pH值出现先升后降的规律,由于粉末在水溶液中很稳定,因而可采用水基浆料制备电解质膜。在La0.85Sr0.15Ga0.85Mg0.15O2.85粉末中加入适量分散剂、粘结剂、塑化剂、去泡剂和溶剂,用流延法制备LSGM厚膜,其厚膜完整、无宏观缺陷及可以卷曲,经过1500℃、10～24h烧结后可得到致密的LSGM厚膜。更多还原

【Abstract】 The oxide LaGaO₃ with the perovskite structure is the most promising solid electrolyte used for solid oxide fuel cells （SOFCs）. The powders of La_0.85Sr_0.15Ga_0.85Mg_0.15O_2.85 （LSGM） were prepared by means of solid state reaction. The pH values of the water solution of the powders increase firstly,and after reaching the maximum value,the pH values decrease gradually with the prolongation of time. The LSGM powders prepared are very stable in the water so that they can be used to prepare slurries using water as the solvent in the preparation of electrolyte films. The preparation of slurries is of great importance in the manufacturing process of LSGM foils by means of the methods of tape casting,screen printing,slurry coating as well as spray coating. In the process of preparation of LSGM slurries,the PBMA-b-PMAS block copolymer （PEO/PMAA）,polyvinyl alcohol（PVA）,polyethyleneglycol 200（PEG）,Agitan 280 and water were used as dispersant,binder,plastici{er,defoamer and solvent respectively. The foils were made by tape casting. The results show that the foils are free of macro-defect and can be bent. The densified LSGM foils were made after annealing at （1 500 ℃） for 10 to 24 hours.更多还原