耐火材料连续颗粒分布的紧密堆积模型

Grain close packing model of refractory with continuous particle size distribution

在研究国内外材料颗粒堆积理论的基础上，以连续尺寸颗粒的分形分布模型为基础，建立了小于某一尺寸颗粒的累积体积分数与颗粒尺寸幂指数关系的模型。采用该模型设计并研究了耐火砖配料与颗粒紧密堆积，发现理论最紧密堆积值n=3-D在0．37附近变化时，最小颗粒ds的变化对耐火材料颗粒粒度组成的影响比较显著，而n值对材料颗粒粒度组成的影响不很明显。以此为基础，结合烧成砖制造的实际相关边界条件，设计了烧成砖的理论粒度质量组成，按此组成，经工业生产制备的烧成砖气孔率为5％～10％，实现了耐火材料的紧密堆积。

Aided by the grain close packing theory and the continuous particle size distribution theory, a theoretical model for the fractal distribution of continuous particle sizes is established, which is later employed for the design and study of the close packing of refractory feed and particles. It is found that, when n=3-D is about 0.37, the change of mini grain ds has a significant influence on the size of refractory particles while the value of n does not have an obvious influence. On this basis and with the conditions of brick sintering taken into account, the optimal composition of particles and fine powders in the sintered bricks are deduced. With the composition, the bulk porosity of the sintered refractory bricks produced is 5%-10%, which means close packing is realized.