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Study on Oxidation Characteristics of Boron Particles in the Ignition Stage
Author(s): 
Pages: 922-925
Year: Issue:  4
Journal: Journal of Engineering Thermophysics

Keyword:  boronignitionoxidation;
Abstract: Boron has higher energy density than magnesium or aluminum.It is an ideal potential addictive of solid fuel in practical.But the ignition mechanism of boron particles is still ambiguous,especially for the key stage,the growth of the oxide layer.The thermogravimetry and tube furnace are used to study the oxidation characteristics of boron particles,i.e.growth of the oxide layer,during the ignition stage.The oxidation process of boron microparticles could be divided into three stages:removal of water,rapid oxidation and slow oxidation.The activation energy of the rapid oxidation stage is 131.74 kJ/mol,using the multi-heating-rate method.The ignition temperature is in the range of 929969 K.It decreases as the concentration of oxygen increases,or the heating rate decreases.The sample after oxidation of boron particles is a sinter.Its structure looks like a kind of Chinese pie:the unreacted boron nucleus inlay in the main oxidation products,B2O2 and B2O3.This structure indicates the reasonability of the ignition model of(BO)n-diffusion.
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