Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第12期    总第69期    2004年12月

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文章编号:1004-0609(2004)12-2137-07
自蔓延冶金法制备硼粉
豆志河,张廷安

(东北大学 材料与冶金学院,沈阳 110004)

摘 要: 提出了自蔓延冶金法制备硼粉的新工艺,由计算可知,B2O3-Mg反应体系的绝热温度为2 604 K,大于自蔓延判据温度1 800 K,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B2O3-Mg体系的相关反应热力学数据进行了分析。由DTA分析可知,B2O3-Mg反应体系在1 123~1 203 K时的放热峰表观活化能为903.75 kJ/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92.43%,平均粒度为0.5~0.8 μm。

 

关键词: 自蔓延高温合成; 绝热温度; 无定形硼粉

Preparation of boron powder by
self-propagating high temperature
synthesis metallurgy
DOU Zhi-he, ZHANG Ting-an

College of Materials & Metallurgy, Northeastern University,
Shenyang 110004, China

Abstract: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 0.5-0.8 μm.

 

Key words: self-propagating high temperature synthesis; adiabatic temperature; amorphous boron

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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