NiFe_2O_4尖晶石粒度级配对振实效率的影响

Effects of Grain Graduation on Vibratory Packing Efficiency in Synthesizing NiFe_2O_4-Spinel Based Inert Anode

根据Furnas模型及线性堆积理论,研究了两种粒径颗粒的级配及细颗粒体积分数对NiFe2O4尖晶石基料振实堆积效率及空隙率的影响,发现随着粗细颗粒粒径比(R)的增大,NiFe2O4尖晶石基料振实堆积效率(E)也相应增大,空隙率减小,且当细颗粒体积分数为30%～40%时,体系的振实堆积效率最大·将粒度分布最宽即粗颗粒尺寸为1 00～0 85mm的试验结果与理论计算值相比较,发现当R≤5时,Furnas模型适用于该体系,但当R≥7时,Furnas模型中的参数C2为6时更适合·

The effects of the size distribution of coarse-fine binary particles and the volume fraction of fine particles on the vibratory packing efficiency and porosity of NiFe_2O_4-spinel powder were studied according to the Furnas model and linear packing density theory. It was found that the vibratory packing efficiency is higher whereas the porosity is lower when the size ratio (R) of coarse particles to fine particles increases. In addition, the vibratory packing efficiency reaches its peak value when the volume fraction of fine particles is 03～04. Comparing the experimental results of which the widest distributed group of granularity was chosen, i.e., the coarse particle size is 100～085 mm, to the values calculated by Furnas model, it was found that Furnas model suits the NiFe_2O_4-spinel powder system when the size ratio R is equal to or less than 5. But when the size ratio R is equal to or more than 7, the parameter C_2 in Furnas model is preferably to be changed to 6.