碳微晶结构对球磨制备镁基储氢材料的影响

Effect of Crystallitic Structure of Carbon on the Preparation of Magnesium-Based Hydrogen-Storage Materials by Ball-Milling

以杏壳活性炭和煤基碳作为镁粉的助磨剂,用氢气反应球磨法制备了镁基储氢材料,对比研究了这两种不同微晶结构的碳在制备镁基储氢材料时作用的差异。结果表明,杏壳活性炭和煤基碳都是镁粉的有效助磨剂,能防止镁粉发生"冷焊"及粘附现象,得到分散的纳米级镁基储氢材料。杏壳活性炭对镁粉的分散性优于煤基碳,但用煤基碳作助磨剂所制得粉体的粒度更小,储氢密度更大,放氢温度更低。

Activated carbon from apricot shell and carbon from coal carbonization were used as grinding aids for magnesium powder, and magnesium-based hydrogen-storage materials were prepared by reactive ball-milling under hydrogen atmosphere. The difference of the effect of the two kinds of carbon of different crystallitic structure on the preparation of magnesium-based hydrogen-storage materials was investigated. It was shown that both of the two kinds of carbon were effective grinding aids for magnesium powder. The carbon could prevent the magnesium powder from ＂cold welding＂ and conglutination, and dispersive nano-particles of magnesium for hydrogen-storage were obtained. The activated carbon was more effective than coal carbon for the dispersion of magnesium powder, however, the resulted material from coal carbon as grinding aid was of smaller particle size, higher hydrogen capacity and lower dehydrogenaton temperature.