硅酸盐学报2008，Vol.36Issue(11)：1620-1624,5.
部分稳定氧化锆陶瓷的凝胶注模成型工艺
PREPARATION OF PARTIALLY STABILIZED ZIRCONIA CERAMIC BY AQUEOUS GELCASTING
摘要
Abstract
A partially stabilized zireonia (PSZ) ceramic was prepared by aqueous gelcasting. The effects of the zeta potentials, solid loading, dispersant content and milling time on the PSZ suspension were studied. The dispersant content has a remarkable effect on the rheological properties of the suspension. The appropriate dispersant mass fraction for PSZ aqueous slurry with the solid loading of 55% in volume is 0.4%. All suspensions (50%-56% solid loading) exhibit a shear-thinning behavior and relatively low viscosity (less than 50 mPa·s, at a shear rate of 10 s-1), which is suitable for casting. The degree of shear thinning and the viscosity at high shear rates increase with the increasing of volume fraction of solid phase. As the milling time is prolonged, the viscosity of the suspension de-creases first, and then a plateau appears and the average diameter remains unchanged. When the milling time is shorter than 20 h, the viseosity of the slurry decreases gradually as the time of milling is increased. After 20 h milling, the viscosity of the slurry tends to be consistent. Therefore, the ball milling time should be equal to or more than 20 h in order to obtain a stable suspension at equilibrium. The appropriate time for casting the slurry (idle time) can be controlled by the amounts of initiator and catalyst added to the slurry as well as by the processing temperature. According to micrographs, the gelcasting green body is homogeneous.关键词
部分稳定氧化锆/凝胶注模/流变特性Key words
partially stabilized zirconia/gelcasting/rheologic property分类
数理科学引用本文复制引用
仝建峰,陈大明..部分稳定氧化锆陶瓷的凝胶注模成型工艺[J].硅酸盐学报,2008,36(11):1620-1624,5.基金项目
国家自然科学基金(50672091)资助项目. （50672091）
