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利用X射线微区衍射,X射线光电子谱(XPS)及激光拉曼光谱等分析,对高温高压下以金刚石微粉为原料的多晶金刚石烧结过程中,金刚石晶粒表面石墨化现象进行了考察。结果表明,虽经历了烧结过程,但在没有掺杂剂作用的区域内,没有发现金刚石晶粒表面的石墨化。晶粒表面石墨化的高峰期,处于掺杂剂刚开始液化,但尚未饱合充填金刚石晶粒间空隙的烧结初期阶段,随着液相掺杂剂的饱和充填和作用,金刚石晶粒表面的石墨消失,并最终完成多晶金刚石的烧结。
The graphitization of diamond grains on the surface of diamond was investigated by XRD, XPS and laser Raman spectroscopy. The results show that although the sintering process has been carried out, no graphitization of the surface of the diamond grains has been found in the region without the dopant effect. At the peak of graphitization of the grain surface, at the initial stage of sintering in which the dopant just started to liquefy but not yet filled the gap between the filling diamond grains, with the saturation filling and action of the liquid phase dopant, the Graphite disappears and the polycrystalline diamond is finally sintered.