(東北大學(xué) 材料與冶金學(xué)院，沈陽 110004)
摘 要: 提出了自蔓延冶金法制備硼粉的新工藝，由計(jì)算可知，B2O3-Mg反應(yīng)體系的絕熱溫度為2 604 K，大于自蔓延判據(jù)溫度1 800 K，故采用自蔓延反應(yīng)是可行的。分析了添加劑MgO和預(yù)熱溫度對(duì)反應(yīng)體系絕熱溫度的影響，并對(duì)B2O3-Mg體系的相關(guān)反應(yīng)熱力學(xué)數(shù)據(jù)進(jìn)行了分析。由DTA分析可知，B2O3-Mg反應(yīng)體系在1 123~1 203 K時(shí)的放熱峰表觀活化能為903.75 kJ/mol，反應(yīng)級(jí)數(shù)為1。由XRD分析確定了燃燒產(chǎn)物以及各個(gè)階段的浸出產(chǎn)物相組成，證實(shí)了三步浸出方案的可行性。考察了自蔓延反應(yīng)初始條件對(duì)硼粉純度的影響，硼粉純度可達(dá)92.43%，平均粒度為0.5~0.8 μm。
關(guān)鍵字: 自蔓延高溫合成; 絕熱溫度; 無定形硼粉
self-propagating high temperature
synthesis metallurgy
（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
