Abstract: To investigate the influence mechanism of milling time on morphologic characters of BC dry powder extinguish agents, the BC dry powder extinguish agents were prepared by utilizing planetary ball milling apparent to grind the mixture powders which were consisted of BC dry powder extinguish agents and magnesium stearates. The morphologic characters of the milling and commercial powders were measured. The results show that the apparent median particle size decreases firstly and then increases when the milling time is between 0.5 and 4 h. The morphology turns from a loose aggregate to a dense spherical aggregate. The critical milling time is 2 h. The optimal apparent median particle size is 3.82 μm. The optimum milling time is 2 h. The limit particle size is between 0.9 and 1.2 μm.

Keywords: dry powder extinguish agents; ball milling; particle size distribution; morphology

中图分类号：X932         文献标志码：A

文章编号：1008-5548（2014）01-0001-06

DOI:10.3969/j.issn.1008-5548.2014.01.001

收稿日期：2013-06-06， 修回日期：2013-06-27，在线出版时间：2014-02-24。

基金项目：国家国际科技合作专项项目，编号 2013DFG71760；国家自然科学基金项目，编号 51174182；浙江省公益项目，编号：2012C23053。

第一作者简介：黄冬梅（1984—），女，博士，讲师，研究方向为粉体灭火原理及技术、 消防员个人防护装备。 电话：0571-86914534， E-mail：20021567@163.com。