Abstract: Taking β-SiC ultrafine powders with median particle size d50 of 1.14 μm as the classification raw materials, the self-developed rising laminar flow hydraulic classification method was used to carry on experimental study of classification. The tracer liquid was used to observe and judge the flow state. The results show that the stable and uniform flow field can be gotten by adjusting the structure of porous ceramic module and flow velocity. Under the state of laminar, different products with average particle sizes of 0.86, 0.75, 0.50， 0.40 μm are gotten at different heights and the flow rates of 2.5 and 2.0 m/h. The β-SiC ultrafine powders are accurately graded.

Keywords: ultrafine powder; rising laminar flow; hydraulic classification; laminar field

中图分类号：TQ172.6⁺34        文献标志码：A

文章编号：1008-5548（2014）02-0022-04

DOI:10.13732/j.issn.1008-5548.2014.02.005

收稿日期：2013-09-11， 修回日期：2013-10-17。，在线出版时间：2014-05-04。

基金项目：国家自然科学基金项目，编号：51074123； 陕西省科学技术研究发展计划项目，编号：2010TG-02。

第一作者简介：邓丽荣（1984—），女，硕士，工程师，研究方向为无机粉体材料的精细化处理。 电话：029-85587373，E-mail：denglirong84@163.com。