过剩压晶种法生长金刚石过程中的浮力效应及其影响

 在合成金刚石的“过剩压晶种法”中,通过适当设计合成腔组装、晶种植种方式及位置、合成条件的选择,观察到在高温高压条件下,晶种在熔化金属触媒中上浮并生长的现象。这一现象是金属与金刚石比重不同而引起的。实验发现,晶种上浮现象与合成条件有密切的关系,适当高的温度与压力是必要的。浮力效应对过剩压晶种法中,金刚石的连聚晶形成及晶体形态,都有一定的影响。

Effect of buoyant force and its influece on the process of geowing diamond by the excess pressure seed method

In "Excess Pressure Seed Method" of synthesis diamond, we have observed the phenomenon that crystal seed grew floating up in the melting metal solvent under high-temperature and high-pressure by appropriate designing the composite cavity assembly, designing the way and the location of crystal seed plant and selecting of composite condition. The phenomenon is caused by the difference of specific gravity between metal and carbon. In the experiment, a close relation is shown between the crystal seed floating up phenomenon and the composite condition. An appropriately high temperature and pressure is necessary. The effect of buoyant has some influence on the formation of the diamond polycrystalline and crystal shape in excess pressure seed method.