纳米多晶金刚石的制备合成研究

Preparation of nano-polycrystalline diamond

本文采用纳米金刚石粉作为原料,铁基(或镍基)金属粉做烧结助剂,利用超高压六面顶压机,在高温高压条件下进行了纳米多晶金刚石的制备实验。研究了铁基(或镍基)金属粉与纳米金刚石粉体系再生长烧结的温度压力条件,并通过SEM、XRD等测试手段对多晶金刚石样品进行了微观形貌和内部成分分析。研究结果表明:合成的多晶尺寸不仅与触媒的种类有关,而且与触媒的粒度粗细也有关系;在6 GPa、1100℃、合成时间60 s的条件下,制备的纳米多晶金刚石材料比较均匀致密,金刚石之间以D-D键结合为主。

Using nano-diamond powder as raw material and Fe-based（or Ni-based）metal powder as sintering agent,nano-polycrystalline diamond was prepared under the condition of high temperature and high pressure on a ultra-high pressure cubic press.The sintering conditions for the system of nano-diamond and Fe-based（or Ni-based） metal powder were studied.The micro-structure and composition of the nano-polycrystalline diamond samples were characterized by scanning electron microscope（SEM） and X-ray diffraction（XRD）.The results showed that the size of synthesized polycrystalline diamond was not only related to the kind of catalyst,but also to the particle size of catalyst.Nano-polycrystalline diamond sample prepared at 6 GPa,1 100 ℃ and 60 s was uniform and compact.SEM observation indicated that the obtained diamond was combined by D-D bonding.