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研究了基于新型纳米粒子晕稳定效应制备的硅溶胶分散氧化铝浆料的流变行为。研究表明,总固相体积分数为40%时,浆料在低剪切速率下呈非常微弱的剪切变稀行为,随剪切速率增大逐渐呈现近牛顿体行为,然后呈现非常微弱的剪切变稠行为,并随剪切速率继续增大再次呈现非常微弱的剪切变稀行为,表明由于纳米粒子晕效应,氧化铝颗粒在硅溶胶中得到了良好的分散。当总体积分数较高时,在较低浓度硅溶胶中分散得到的浆料均呈明显的触变性,但在较低浓度硅溶胶中分散得到的总固相体积分数较低的浆料,以及在较高浓度硅溶胶中分散得到的高固相体积或低固相体积分数浆料均呈微弱的触变性。研究表明,浆料的流变性能可采用修正的Eilers模型进行表征,其最大堆积分数ΨT,max和ΨA,max均随着ΨS增大而增大。
The rheological behavior of silica sol-dispersed alumina slurries prepared on the basis of novel nanoparticle halo stabilization effect was studied. The results show that when the total solid volume fraction is 40%, the slurry shows a very weak shear-thinning behavior at low shear rate, and gradually exhibits near-Newtonian behavior with increasing shear rate, and then shows a very weak shear Shear thickening behavior, and continue to increase with the shear rate again showed very weak shear thinning behavior, indicating that due to nanoparticle halo effect, alumina particles in the silica sol has been well dispersed. When the total volume fraction is higher, the slurries dispersed in the lower concentration silica sol show obvious thixotropy, but the slurries with lower total solid fraction dispersed in lower concentration silica sol and The high solid volume or low solid volume fraction slurry dispersed in the higher concentration silica sol showed weak thixotropy. The results show that the rheological properties of the slurry can be characterized by the modified Eilers model. The maximum stacking fraction ΨT, max and ΨA, max both increase with ΨS increasing.