基于离散元的氧化铝造粒粉堆积仿真研究

Simulation Study on Accumulation of Alumina Granulation Powders Based on Discrete Element Method

颗粒级配对材料的性能有重要影响。掌握粉体堆积模型对其性能的影响,是简化粉体模型构建过程和预测其烧结性能的关键。本文利用离散元软件EDEM结合Furnas模型、Rosin-Rammler-Bennet(RRB)模型和Horsfield模型三种堆积模型进行粉体堆积模拟实验,采用99瓷氧化铝球形造粒粉分别对上述模拟进行实验验证以及对比分析。结果表明:经三种模型优化后粉体的松装密度、振实密度和压坯密度均有提升。其中,Furnas模型对堆积密度提升效果最好,松装密度与振实密度分别提高4.1%与2.5%。Horsfield模型模拟堆积时空隙率最小,烧后试样体积密度最大为3.84 g/cm^(3),致密度达96.2%。

The particle size has a great influence on the properties of materials.To understand the effect of powder accumulation model on the properties of materials is the key to simplify the process of powder model construction and predict the sintering properties of materials.In this paper,the powder accumulation was simulated by the discrete element software EDEM combining Furnas,Rosin-Rammler-Bennet(RRB)and Horsfield models.The experiments were verified by using spherical granulation powders for 99 alumina ceramics.The results show that the bulk density,vibration density and compaction density of the powder are improved through the optimization with three models,especially the apparent and tap density optimized based on Furnas model were increased by 4.1%and 2.5%,respectively.The minimum porosity was achieved through the simulation based on Horsfield model,and the maximum bulk density of the sintered product was 3.84 g/cm^(3).Its relative density was as high as 96.2%.