PDC材料超高压烧结中聚晶金刚石晶粒异常生长及其抑制机制研究

摘要

通过非正常工艺条件下的PDC材料高压合成实验，考察了烧结温度、保温时间以及不同的金属添加剂对PDC材料烧结过程中金刚石聚晶晶粒异常生长行为的影响，发现添加Fe-Ti(Zr)金属系统对烧结过程中晶粒异常生长有明显的抑制作用，并认为其抑制作用的实质就是控制金刚石从金属-碳熔体中的重结晶速率。%The effects of sintering temperature, time and ad-ditives on abnormal growth of polycrystalline diamond were investigated under abnormal sintering conditions. The addit-ives of Fe-Ti(Zr) was proved to be effective in the control of the abnormal growth, and the effect of the additives on ab-normal growth was suggested to be in fact controlling the re-growth rate of diamond from the carbon metallic melt.