Catalytic Mechanism of Saw Diamond
- 作者：James C.Sung
- 会议时间：2013-11-13
- 关键词：diamond synthesis ; catalytic mechanism ; carbon solution ; kish ; graphene
- 作者单位：Right Diamond Company;Kinik Company
- 母体文献：第六届郑州国际超硬材料及制品研讨会暨庆祝中国人造金刚石诞生50周年大会论文集
- 会议名称：第六届郑州国际超硬材料及制品研讨会暨庆祝中国人造金刚石诞生50周年大会
- 会议地点：郑州
- 主办单位：中国机床工具工业协会
- 语种：chi
摘要
As a historical note on the litigation of GE (General Electric) against DB (De Beers) on patent infringement of diamond synthesis under ultrahigh pressure, GE contended that the molten alloy used for diamond synthesis was used as a catalyst, but DB insisted that diamond was crystalized from the solvent solution that was oversaturated with carbon.It is now clear that for the commercial production of diamond grits under ultrahigh pressure, catalytic function is predominant and the solution mechanism is secondary.If the molten alloy is thick and the temperature is high, graphite may be fully dissolved.In this case, solution mechanism can be dominating.However, even so, the catalytic function is not completely ruled out as solution itself is a result of weak catalytic interaction between solvent atoms and solute atoms.In fact, the catalysis may take the path to pucker graphene to form octahedral (111) lattice plane of diamond.On the other hand, the power of catalysis is manifested in the solubility of carbon atoms in the molten solvent under ultrahigh pressure so the catalysis-solution may be unified as two sides of the same coin.In this report, we examined the template mechanism of carbon solvent to assemble diamond by puckering the suspended graphene under high pressure.We also demonstrated that the same molten catalyst can also reconstitute dissolved carbon atoms to form pristine graphite at ambient pressure.The recrystallized graphite, also known to iron makers as kish, can be the best precursor material for making graphene for many applications.