Development of diamond tools with improved wear resistance and fracture strength.

本研究在热丝化学气相沉积(CVD)装置上制备了不同硼含量的单晶和多晶金刚石薄膜，并对其力学性能进行了测试。在金刚石合成气氛中加入含氢气稀释到1000ppm的B(CH3)3：三甲基硼，在金刚石中加入硼。结果表明，随着硼含量的增加，单晶金刚石膜的结晶度增加。此外，加入硼后，材料的赫兹断裂强度提高了20%。研究还表明，加入硼后，聚晶金刚石膜的耐磨性提高了近3倍。

In this study, single-crystal and polycrystalline diamond films with different boron contents were synthesized in hot-filament chemical vapor deposition (CVD) apparatus to evaluate the mechanical properties of these films. Boron was added to the diamond by introducing B(CH_3)_3 : trimethyl boron diluted to 1000ppm with hydrogen into the diamond-synthesis atmosphere. The results indicate that the crystallinity of the single-crystal diamond film increased with increasing boron content. Furthermore, the Hertz fracture strength increased by 20% upon th addition of boron. It was also clarified that the wear resistance of polycrystalline diamond film increased approximately threefold upon the addition of boron.