摘要
研究了一种新的凝胶体系聚乙烯醇和丙烯酰胺(PVA-AM)的凝胶流延成型。由于空气中的氧阻止了单体的聚合,不能形成胶体,传统丙烯酰胺体系的凝胶注模成型制备的陶瓷坯体的表层出现裂纹甚至脱落。为了避免这个问题,通常都是选择氮气保护下浇注成型,这个过程繁琐且成本较高。通过使用本研究的凝胶体系,在原有体系的基础上添加适量的新组分聚乙烯醇,在自然环境下就可以获得表面完好的陶瓷坯体。研究了氧化铝粉在含有PVA水溶液中的分散情况,PVA-AM体系浆料的流变行为以及固化情况;同时对坯体的性能和显微结构进行了观察。这种新的体系尤其适用于制备陶瓷薄片或陶瓷薄膜,在利用凝胶流延工艺制备固体氧化物燃料电池电解质中有较好的应用。
A new gel-tape casting in the mixed polyvinyl alcohol and acrylamide systems was studied. Due to the presence of oxygen suppressed the polymerization of monomer and destroyed formation of gel, the surface spallation of the green body by conventional gel casting occurred frequently. To solve this problem, ceramic gel casting is often performed in a nitrogen atmosphere, which is a complex and expensive process. This study shows that the surface spallation of ceramic green bodies which gel cast in air could be suppressed by introducing a proper amount of water-soluble polymer, polyvinyl alcohol （PVA）, to the acrylamide monomer solution. The rh＇eological behavior and the gelling behavior of the alumina suspension were analyzed. Microstructure of the gel cast green body wag studied. Especially, the new system is fit for fabricating ceramic film. The gel-tape casting originated from gel casting processing was better applied to fabricate electrolyte materials of solid oxide fuel cell.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A01期387-390,共4页
Rare Metal Materials and Engineering
基金
新型陶瓷与精细工艺国家重点实验室开放基金资助项目
北京市教育委员会共建项目建设计划
关键词
凝胶流延成型
聚乙烯醇
陶瓷坯体
gel-tape casting
polyvinyl alcohol
ceramic green body
