自蔓延冶金法制备硼粉  

Preparation of boron powder by self-propagating high temperature synthesis metallurgy

作　　者：豆志河[1] 张廷安[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004

出　　处：《中国有色金属学报》2004年第12期2137-2143,共7页The Chinese Journal of Nonferrous Metals

基　　金：辽宁省博士启动基金资助项目 ( 9910 3 0 0 40 2 ) ;辽宁省重点学科带头人培养计划资助项目 ( 2 0 0 11712 42 0 6)

摘　　要：提出了自蔓延冶金法制备硼粉的新工艺 ,由计算可知 ,B2 O3 Mg反应体系的绝热温度为 2 6 0 4K ,大于自蔓延判据温度 180 0K ,故采用自蔓延反应是可行的。分析了添加剂MgO和预热温度对反应体系绝热温度的影响 ,并对B2 O3 Mg体系的相关反应热力学数据进行了分析。由DTA分析可知 ,B2 O3 Mg反应体系在 112 3～12 0 3K时的放热峰表观活化能为 90 3.75kJ/mol,反应级数为 1。由XRD分析确定了燃烧产物以及各个阶段的浸出产物相组成 ,证实了三步浸出方案的可行性。考察了自蔓延反应初始条件对硼粉纯度的影响 ,硼粉纯度可达92 .4 3% ,平均粒度为 0 .5～ 0 .8μm。The new self-propagating high temperature synthesis(SHS) metallurgy method used to prepare boron powder was studied, and the adiabatic temperature is 2 604 K through calculating, which is higher than the SHS criterion parameter of 1 800 K. So the SHS reaction is feasible. Influences of addition MgO and warm-up temperature on adiabatic temperature and the thermodynamic data of correlative reactions were analysed. Results of DTA indicate that the apparent activation energy of exothermic peak is 903.75 kJ/mol and reaction order n is 1. Phases of combustion and leached products were confirmed by XRD, which proves that the three-step leaching technic is feasible. The effects of the initial conditions of self-propagating high temperature synthesis on boron purity were studied. The purity of boron powders reach 92.43% and the average diameter of boron powders is (0.50.8 μm.)

关 键 词：自蔓延高温合成 绝热温度 无定形硼粉 

分 类 号：TF123.121[冶金工程—粉末冶金]