Abstract In this work, the diamond particles were deposited with titanium (Ti) by the magnetron sputtering, and the polycrystalline diamond compact synthesized by the Ti-coated diamond particles (Ti-PDC) was prepared by high temperature and high pressure (HTHP) sintering method. The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) results show that the Ti coating uniformly distributes on the surface of diamond particles. The results of X-ray diffraction (XRD) indicate that the TiC phase has been produced during the sintering process. The impact toughness of the Ti-PDC is higher than that of the pristine polycrystalline diamond compact (P-PDC). In addition, the friction coefficients of Ti-PDC under different vacuum conditions reveal lower values than those of the P-PDC. A less number of exfoliated pits can be observed on the worn Ti-PDC surface. The improved impact toughness and vacuum friction performance of Ti-PDC may be attributed to the enhanced bonding strength between diamond particles, which is induced by the TiC phase. In brief, the Ti-coated diamond particles can improve the bonding strength between diamond grains and thus yield to an enhanced service performance of the PDC.

中文翻译：

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基于钛包覆金刚石颗粒的多晶金刚石的真空摩擦学性能和冲击韧性

摘要 本研究采用磁控溅射法在金刚石颗粒上沉积钛（Ti），通过高温高压（HTHP）烧结制备钛包覆金刚石颗粒（Ti-PDC）合成的多晶金刚石复合片。方法。扫描电子显微镜 (SEM) 和能谱仪 (EDS) 结果表明，Ti 涂层均匀分布在金刚石颗粒表面。X 射线衍射 (XRD) 的结果表明，在烧结过程中已经产生了 TiC 相。Ti-PDC 的冲击韧性高于原始多晶金刚石复合片 (P-PDC)。此外，Ti-PDC 在不同真空条件下的摩擦系数显示出低于 P-PDC 的值。在磨损的 Ti-PDC 表面上可以观察到较少数量的剥落凹坑。Ti-PDC 改善的冲击韧性和真空摩擦性能可能归因于由 TiC 相诱导的金刚石颗粒之间增强的结合强度。简而言之，Ti 涂层金刚石颗粒可以提高金刚石晶粒之间的结合强度，从而提高 PDC 的使用性能。