超细钨粉的制取及其氧化钨原料和钨粉的粒度测量

PRODUCING OF ULTRAFINE TUNGSTEN POWDER AND PARTICLE SIZE MEASUREMENT OF OXIDES AND ULTRAFINE TUNGSTEN POWDER

选取相成分单一的氢钨青铜 (H0 .33WO3)、铵钨青铜 ((NH4 ) 0 .5WO3)和紫钨 (WO2 .72 )作为原料 ,研究钨原料对制取超细钨粉的影响 ,对氧化钨原料和超细钨粉的粒度测量方法作了比较。研究结果表明 ,紫钨由于有着特殊的结构 ,其制得的钨粉细而均匀 ,分散性好 ,可适合于做微晶硬质合金的原料。氧化钨原料的粒度 (伪同晶颗粒尺寸 ,即二次颗粒 )测量 ,推荐使用激光衍射法。超细钨粉粒度 (一次颗粒 )的炉前测量 ,BET法测球形当量径相当理想。

In this article, three kinds of tungsten oxide materials, just hydrogen tungsten bronze (H 0.33 WO 3), ammonium tungsten bronze ((NH 4) 0.5 WO 3) and violet tungsten oxide (WO 2.72 ) were selected to study the influence of raw materials on producing ultrafine and homogeneous tungsten powder. The research results showed that, because of the special porous structure of WO 2.72 particles, the homogeneous and ultrafine tungsten powder derived from WO 2.72 has loose structure which is more suitable for the microcrystalline hard metals than that of the powders from the other TBO materials selected in this study. In addition, the authors suggest that laser diffraction is a suitable method for evaluating particle size of blue tungsten oxide, and the BET method for equivalent spherical diameter is suitable for the optimum in line measurement for particle size of ultrafine tungsten powder.