【摘要】 通过对碳化硅粉体在有机单体介质中的Zeta电位、分散剂用量和浓悬浮体的粘度等的测试及其沉降试验 ,详细研究了粒径分布较宽的碳化硅粉体 (0 .2～ 2 5 0 μm)的胶体分散特性、沉降行为以及浓悬浮体的流变行为。结果表明 ,选用适量的分散剂四甲基氢氧化铵可使SiC颗粒的Zeta电位绝对值提高近 2 0mV ,调整浆料pH至 11.9附近可制备出固相体积分数高达 70 %的SiC浓悬浮体。该浓悬浮体中粗细SiC颗粒间能达到均一稳定的分散 ,悬浮粒子不会产生明显地沉降 ,其流变行为符合Quemada模型。更多还原

【Abstract】 The dispersion and sedimentation of SiC powders (0.2-250 μm) in an organic medium and the rheological behavior of the suspensions were investigated by the measurements of Zeta potential, sedimentation and viscosity. The results show that the increment of absolute value of 20 mV Zeta potential can be achieved with a proper amount of the dispersant and a concentrated suspension with 70% solid volume can be obtained when the pH value of the suspensions is adjusted to about 11.9. The SiC powders are dispersed stably in the suspension with no obvious sedimentation. The rheological behavior of the concentrated SiC suspension follows the Quemada model.更多还原