经20h机械活化后的Si粉, 在空气中可以实现自燃烧合成反应, 并表现出二次燃烧现象. 燃烧产物的表层与内部具有显著不同的特征, 表层产物中以α-Si3N4 为主相, 并有少量Si2N2O相和非晶SiO2共存, 内部为整块的灰白色松散Si3N4粉体, 其相组成与反应条件有关. 本文研究了经机械活化(MA)处理后的硅粉在空气中燃烧反应的整个过程, 证实了机械活化处理后的Si粉在空气中燃烧的可行性, 分析了燃烧产物主要是Si3N4 而不是SiO2的原因, 并通过调整成份实现了对产物相组成的控制.
The silicon mixture mechanically activated for 20h could combust in air. It was found that the burning of silicon powder occurred via two-stage self-propagating regime. The surface and center of the synthesized products are demonstrated to be with different features. On the surface of the product, α-Si3N4 is the major phase coexisting with minor Si2N2O and amorphous SiO2, while in the center of the lump, loose grey powders are Si3N4 powders whose phase composition depends on the reaction conditions. The whole combustion process of silicon powders in air after mechanical activation approves the feasibility of silicon combustion in air. The qualitative discussion given shows the formation of Si3N4 instead of SiO2 in air. Furthermore, the phase composition of product can be controlled by adjusting the composition of the reactant mixtures.
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