期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 20, 页码 17571-17578出版社
AMER CHEMICAL SOC
DOI: 10.1021/am503399u
关键词
poly(vinylphosphonic acid); surface modification; Ti6Al4V; superlubricity; superlow wear
资金
- Tsinghua University Initiative Scientific Research Program
- State Key Laboratory of Tribology
- Innovative Research Groups of the National Natural Science Foundation of China [51321092]
- National Key Basic Research Program of China [2013CB934202]
Poly(vinylphosphonic acid) (PVPA) is a type of hydrophilic polymer that can be used in surface modifications. In our study, PVPA coatings were formed on the surfaces of titanium alloy (Ti6Al4V) using a simple and novel method to achieve efficient lubrication at friction interfaces. The composition and 3D skeletal structure of the PVPA coatings were confirmed by X-ray photoelectron spectroscopy (XPS), focused ion beam/scanning electron microscopy (FIB/SEM), and solid-state nuclear magnetic resonance (NMR). The PVPA-modified Ti6Al4V/polytetrafluoroethylene (PTFE) interface shows a superlow friction coefficient (approximately 0.006) for at least 8 h under a contact pressure of 44.2 MPa (initial pressure), which means it falls into the superlubricity regime. Moreover, wear on the surfaces of both the Ti6Al4V and PTFE after the tribological experiment is superlow. It is proposed that the 3D skeletal structure of the PVPA coating and fluid-like manner at friction interfaces owing to the fast exchange of water molecules are the main factors accounting for the superlow friction and wear. The PVPA-modified Ti6Al4V has the potential uses in artificial cervical discs.
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