摘要
为了对供给态和研磨态超细钨粉的颗粒粒度进行表征,将供给态粉和研磨态粉由激光衍射法、FSSS法和BET法测量出颗粒粒度。实验结果表明:利用激光衍射法和FSSS法所测量出来的供给态粉和研磨态粉的粒度结果是错误的,这是因为测量系统存在缺陷和测量原理不合适所致。可以使用吸附等温线来获得表面粗糙度的分数维维数D和微孔的表面积S_t,且用D和S_t来修正d_(BET)的计算公式。在本实验中,使用修正公式得到的4种粉末的平均粒度值与扫描电镜的观测值相一致。
The particle size measurement of as-supplied and lab-milled ultrafine tungsten powders were investigated in this paper. FSSS method and laser diffraction method and BET method were used to perform the particle size measurement. Results shown that the mean particle size values obtained from the above mentioned methods of as-supplied and lab-milled powders were misleading because of the defects of the measurement system or unsuitability of measurement theory. The fractal dimension of surface roughness and external surface area of pores obtained from adsorption isotherms were used to modify d_BET calculation formula. By the modified formula, the calculated particle size values of four powders in this study were in good agreement with the SEM sizes.
出处
《粉末冶金材料科学与工程》
EI
2002年第2期153-160,共8页
Materials Science and Engineering of Powder Metallurgy
关键词
超细钨粉
颗粒粒度
表征
ultrafine tungsten powder
particle size
investigation
