滑动流气透法测量比表面的研究——Blatne仪器法

MEASUREMENT OF SPECIFIC SURFACE USING SLIP FLOW PERMEAMETRY——BLAINE APPARATUS METHOD

本文由粉末床层的滑动流一般公式推导出 Blaine 仪测量计算比表面 S_V 的公式,对一些粉末进行了测量研究,使简便的 Blaine 仪扩大应用到细粉末范围。结果表明,粘滞流公式不适用于亚微米粉末,用粘滞流公式计算的 S_K 对于 S_V 的误差随粉末粒度和床层孔度的减小而增大。本文还讨论了测量计算的 S_V 随孔度变化的复杂原因。

The formula for calculation of specific surface S_v for Blaine apparatus was derived from the general formula of slip flow for powder bed.A study of measure- ment of S_v for some powders was made by using the formula derived,thus enabling Blaine apparatus to be used for fine powders.The error between S_k calculated using the viscous flow formula and S_v increased with the decrease of the particle size of powder and with the decrease of the bed porosity.Furthermore,the complicated reasons for the change of S_v calculated with the bed porosity were discussed.