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。 In the “excess pressure seed crystal method” of synthetic diamond, through the appropriate design of the synthesis chamber assembly, seed planting method and location, the choice of synthesis conditions, it is observed that under the conditions of high temperature and high pressure, seed seeds float and grow in the molten metal catalyst The phenomenon. This phenomenon is caused by the different weights of metal and diamond. The experiment found that the seed floating phenomenon and the synthesis conditions are closely related to the appropriate high temperature and pressure is necessary. Buoyancy effect on the excess pressure seed crystal method, diamond even polycrystalline formation and crystal morphology, have a certain impact.