天然金刚石的锯切表面分析

Sawed surface analysis of natural diamond

锯切金刚石是加工精度较高的一种切割方式。利用钻石切割机对天然金刚石进行切割后,通过光学显微镜、粗糙度测量仪、X射线衍射仪等对锯切金刚石的切割面进行检测分析,获得天然金刚石(100)晶面的表面形貌、粗糙度、物相等。结果表明:刀痕是影响天然金刚石锯切表面加工质量的主要因素,切割后的表面都会生成碳的非石墨相同素异形体,刀痕表面碳的同素异形体含量为8.3%,光滑表面为2.0%。采用正常的锯切方式,可以得到良好的天然金刚石切割表面。

Sawing diamond is a cutting method with high processing precision. Diamond cutting machine is used to cut natural diamond, and then the sawing diamond cutting surface is detected and analyzed by optical microscope, roughness measuring instrument and X-ray diffractometer. The surface morphology, roughness and crystal image of natural diamond (100) crystal surface are obtained. The results show that tool trace is the main factor affecting the quality of natural diamond sawing surface processing. It is also found that isomerization of carbon occurs on the surface after cutting and generates a non-graphitizing carbon allotrope, whose content on the surface of the tool trace is 8.3% but 2.0% on smooth surface. Good natural diamond cutting surface can be obtained by normal sawing method.