氧化锆/氧化铝复合陶瓷悬浮体的制备及流变性能

选用Al2O3、ZrO2为粉体原料,在不同介质中测定了粉体的Zeta电位和粒度分布;研究了各种固含量条件下分散剂加入量对悬浮体流变性的影响.结果表明:在pH=10-11附近、分散剂的加入量为0.9%(质量百分数,下同)时复合陶瓷悬浮体的表观粘度呈现最低值;在优选实验条件下,固含量为85%的悬浮体表观粘度随剪切速率的增大而降低,带有明显的"剪切变稀"现象,呈现假塑性流体的特征.采用固含量85%的悬浮体,制备出氧化锆/氧化铝复合泡沫陶瓷.

Preparation and Rheological Behaviors of Suspension for Zirconia/Alumina Ceramics Comosite

Alumina and zirconia powder are used as the raw material,Zeta potential and the granularity distribution of the powder under the different media are determined;effects of different capacity of dispersant additive under the condition of different solid content on the rheological behaviors of the suspension are investigated.The results show that a low viscosity suspension can be obtained when the pH value is around 10 and the best fraction of adding dispersant is 0.9wt%;under the optimized experiments,the nominal viscosity of the 85wt% suspension decreases with the increasing shear rate,with evident shear-thinning characteristic,exhibiting the pseudo-plastic liquid characteristic.By using the 85wt% suspension,zirconia/alumina compound foam ceramic is prepared