Abstract
In this study, the influence of the coating of diamond particles on the tribological behaviors of polycrystalline diamond (PCD) was investigated. Titanium- (Ti)- and Boron- (B)-coated diamond particles were sintered under high pressure-high temperature condition to obtain Ti-PCD and B-PCD, respectively. The Ti and B coatings were deposited via magnetic sputtering. The PCD specimens were characterized through scanning electron microscopy, X-ray diffraction, impact tests, thermal gravimetric analysis-differential scanning calorimetry and tribological tests. The results indicate that uniform titanium carbide (TiC) and boron carbide (B4C) phases are generated during the sintering processes of Ti-PCD and B-PCD, respectively. The as-obtained TiC phase promotes the tribological behaviors of Ti-PCD in vacuum, including a considerable enhancement of wear resistance. The TiC phase inhibits diamond exfoliation by strengthening interface bonding, which involved transforming the mechanical interaction between the diamond grains and cobalt binder to chemical bonding. However, massive pores are formed during sintering that weakens the interface bonding in B-PCD, and thus the induced wear resistance is low. Therefore, the Ti coating of diamond particles promotes the tribological behaviors of PCD, whereas B coating deteriorates it. This study lays a foundation for the development of suitable technology for the fabrication of PCD.
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