| 摘要 |
PURPOSE:In synthesizing diamonds by ultra-high pressure and high temperature method using seeds grains of diamonds, a solvent metal and carbon, to synthesize diamonds having uniform particle size, by arranging seed diamonds in the carbon or the solvent metal of laminate of them or in their interfacial boundary regularly. CONSTITUTION:Seed grains of diamonds are arranged in a plate of power of graphite as a carbon raw material or a plate or powder of Fe, Co, Ni, Cr, Ta, etc. as a solvent metal of laminate of them or in their interfacial boundary. When graphite and the solvent metal are plates, holes with bottoms are made in the laminate and the seed diamonds are put in them. When graphite and the solvent metal are powder, the seed diamonds are embedded in it. Or, the seed diamonds are arranged between the layers of graphite and the solvent metal and they are reacted at high temperature under high pressure, to synthesize diamonds. Diamonds having small dispersion of particle diameters can be synthesized without controlling pressure and temperature strictly. |
