Comparison of tribological behaviors of polycrystalline diamonds synthesized by titanium- and boron-coated diamond particles
Comparison of tribological behaviors of polycrystalline diamonds synthesized by titanium- and boron-coated diamond particles
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钛涂层和硼涂层金刚石颗粒合成的多晶金刚石的摩擦学行为比较
DOI：
10.1016/j.diamond.2022.109242
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发表时间：
2022-10
影响因子：
4.1
通讯作者：
Chengbiao Wang
中科院分区：
文献类型：
--
作者：
Xiaohua Sha;Bo Feng;Wen Yue;Chengbiao Wang
在这项研究中，研究了金刚石颗粒涂层对多晶金刚石（PCD）摩擦学行为的影响。在高压高温条件下烧结钛（Ti）和硼（B）涂层金刚石颗粒，分别获得Ti-PCD和B-PCD。 Ti 和 B 涂层通过磁溅射沉积。通过扫描电子显微镜、X射线衍射、冲击试验、热重分析-差示扫描量热法和摩擦学试验对PCD样品进行了表征。结果表明，Ti-PCD和B-PCD在烧结过程中分别生成了均匀的碳化钛(TiC)相和碳化硼(B 4 C)相。所获得的 TiC 相促进了 Ti-PCD 在真空中的摩擦学行为，包括显着提高了耐磨性。 TiC 相通过加强界面结合来抑制金刚石剥落，这涉及将金刚石晶粒和钴粘合剂之间的机械相互作用转变为化学结合。然而，B-PCD在烧结过程中会形成大量孔隙，削弱了界面结合力，导致耐磨性能较低。因此，金刚石颗粒的Ti涂层促进了PCD的摩擦学行为，而B涂层则使其恶化。该研究为开发适合PCD制造的技术奠定了基础。 • Ti-PCD 和B-PCD 分别用Ti 和B 涂层金刚石颗粒烧结而成。 • 研究了Ti-PCD 和B-PCD 的摩擦学行为比较。 • 烧结过程分别在Ti-PCD 和B-PCD 中引入TiC 和B 4 C。 • TiC 通过界面强化促进 Ti-PCD 的真空摩擦学行为。 • 烧结过程中产生的大量孔隙使B-PCD 的耐磨性较低。
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 (B 4 C) 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. • Ti-PCD & B-PCD are sintered with Ti- & B-coated diamond particles, respectively. • Comparative tribological behaviors of Ti-PCD and B-PCD are studied. • The sintering process introduces TiC and B 4 C in Ti-PCD and B-PCD, respectively. • TiC promotes vacuum tribological behaviors of Ti-PCD by interface strengthening. • Massive pores introduced during sintering impart a low wear resistance to B-PCD.
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