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介绍了一种制备纳米石墨粉的新方法———负氧平衡炸药爆轰法 .对合成的黑粉产物进行x射线衍射分析 ,确认其为石墨结构 ,平均晶粒度为 2 58nm .透射电子显微分析的结果表明 ,炸药爆轰法制备的黑粉为六方结构的纳米石墨粉 ,颗粒呈球形或椭球形 .用小角x射线散射法测定纳米石墨粉的粒度分布在 1— 50nm ,有 92 6wt %的粉末粒度小于 16nm .平均粒径为 8 9nm .纳米石墨粉的比表面积约为 50 0— 650m2 g .在六面顶压机中用纳米石墨粉在Fe粉触媒的作用下进行金刚石的高压合成实验 .实验结果表明 ,约在 12 50— 13 3 0K的范围内 ,有金刚石颗粒生成 ,颗粒尺寸为 5— 15μm ,呈球状或块状 .这一合成温度比用普通石墨合成金刚石的温度低约 3 0 0K
A new method for the preparation of nano-graphite powder, ie, detonation method with negative oxygen balance explosives, was introduced.X-ray diffraction analysis of the synthesized black powder was carried out to confirm that it was a graphite structure with an average grain size of 2 58nm. The results of microanalysis showed that the black powder prepared by detonation detonation method was hexagonal nanometer graphite powder with spherical or ellipsoidal shape.The particle size distribution of nanometer graphite powder was determined by small-angle x-ray scattering from 1 to 50 nm with 92 6wt% powder particle size of less than 16nm average particle size of 8 9nm nano-graphite powder specific surface area of about 50 0- 650m2 g in a six-sided top press with nano-graphite powder under the action of Fe powder catalyst diamond High pressure synthesis experiment.The experimental results show that diamond particles are formed in the range of 1250-1330K and have a particle size of 5- 15μm with a spherical or lump shape.The synthesis temperature is higher than that of ordinary graphite Low about 3 0 0K