原生表面粗糙化的金刚石单晶制备及表征

Preparation and characterization of diamond single crystal with native rough surface

通过添加新型催化剂、优化触媒配方、调整还原工艺以及优化合成温度和压力,开发表面粗糙化的金刚石单晶,实现对其颜色及表面形貌的调控。扫描电子显微镜和原子力显微镜表征金刚石晶体表面具有规则的波纹状纹路;拉曼光谱证明金刚石晶体表面碳原子的杂化类型为sp 3;冲击韧性和热冲击韧性结果显示原生表面粗糙化的金刚石的热稳定性优于常规金刚石的;此外,原生表面粗糙化的金刚石磁化率低,晶体内部杂质少。锯切试验结果表明:使用该类金刚石制成的小径锯片具有良好的锋利度和耐磨性。

Single crystal diamond with rough surface is obtained by adding a new type of catalyst,optimizing composition of the catalyst,adjusting reduction process,optimizing the temperature and pressure conditions in the synthetic procedure.The regulation of crystal color and surface morphology are realized.The results of scanning electron microscope(SEM)and atomic force microscope(AFM)show that there are regular wavy patterns on the surface of the crystal.Raman spectra indicates that the carbon atoms in the diamond crystal surface are in sp 3 hybridization state.The test results of impact resistance and thermal impact resistance illustrate that the native roughened diamond has better thermal stability than the ordinary diamond does.In addition,the native roughened diamond has lower magnetic susceptibility and impurities in the crystal.The sawing test shows that the small diameter saw blade made of native surface roughened diamond has better sharpness and wear resistance.