Comparison of tribological behaviors of polycrystalline diamonds synthesized by titanium- and boron-coated diamond particles

被引：3
作者：
Sha, Xiaohua
Feng, Bo [1 ]
Yue, Wen [2 ]
Wang, Chengbiao [2 ]
机构：
[1] Ningxia Vocat Tech Coll Ind & Commerce, Ningxia 750021, Peoples R China
[2] China Univ Geosci Beijing, Sch Engn & Technol, Beijing 100083, Peoples R China
来源：
DIAMOND AND RELATED MATERIALS | 2022年 / 128卷
基金：
中国国家自然科学基金;
关键词：
Polycrystalline diamond; Tribological behaviors; Coating; Carbide-forming element; MECHANICAL-PROPERTIES; COMPOSITES; RESISTANCE; SILICON; COMPACT; CARBON; PHASES;
D O I：
10.1016/j.diamond.2022.109242
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 micro-scopy, X-ray diffraction, impact tests, thermal gravimetric analysis-differential scanning calorimetry and tribo-logical 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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页数：7
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