Mg2Ni纳米晶储氢材料的机械合金化制备工艺研究

利用机械合金化方法制备了Mg2Ni纳米晶粉末,根据不同球磨参数下样品的X射线衍射结果,分析了球磨过程中相组成、粉末晶粒度等的变化,研究了球磨时间、球磨转速、过程控制剂等工艺条件对粉末晶粒度、机械合金化程度的影响.结果表明:在较高的转速下进行循环变速运行并加入合适的过程控制剂可以使生成Mg2Ni的时间提前,完全合金化的过程缩短,得到的Mg2Ni晶粒度为10nm左右.对Mg2Ni纳米晶粉末进行了初步的贮氢性能研究,结果表明:机械合金化制备的样品在室温下即可吸氢,贮氢性能较之传统材料有较大改善.

Investigation of the Preparation of Mg2Ni Nanocrystalline Hydrogen-storage Materials by Mechanical Alloying

Mg 2Ni nanocrystalline powder has been synthesized by mechanical alloying. X-ray diffraction results for samples of various milling parameters have been used to analysis the change of phase and particle size and so on during the milling process. The effect of milling time, speed and process control agent on the particle size of the powder and MA process has also been studied. According to the results, the cycle operation with higher rotary speed and suitable PCA(process control agent) can bring forward of the production of Mg 2Ni and the total time of finishing MA is shortened. The particle size of Mg 2Ni is about 10nm. The hydrogen storage property of Mg 2Ni nanocrystalline powder was preliminary studied. The results show that the sample prepared by mechanical alloying can absorb hydrogen even at ambient temperature, its hydrogen storage properties were better than the materials prepared by conventional methods.