Carbon fiber cannot always reduce the wear of PEEK for orthopedic implants under DPPC lubrication  

作　　者：Shuai YAN Shichao MEN Hongbo ZOU Haoji WANG Zhongjiang ZHANG Chunshen WANG Tianyi SUI Bin LIN 

机构地区：[1]Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin University,Tianjin 300072,China

出　　处：《Friction》2023年第3期395-409,共15页摩擦（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Grant Nos.52175180,51805366);the Natural Science Foundation of Tianjin City(Grant No.19JCQNJC04100).

摘　　要：Excellent wear resistance is an important feature of orthopedic implants.However,although pure polyetheretherketone(PEEK)is outperformed by carbon fiber-reinforced PEEK(CF-PEEK)for stability and durability under laboratory conditions,it is not clear whether CF-PEEK should be preferred in all real-world applications.Results indicate that,under dipalmitoylphosphatidylcholine(DPPC)lubrication,the wear rates of PEEK are 35%-80%lower than the wear rates of CF-PEEK for different implant materials,speeds,loadings,and DPPC concentrations.Molecular dynamics calculations confirm that DPPC self-assembles on the PEEK surface to form an easily adsorbed continuous phospholipid lubricating film.In contrast,the carbon fibers on the CF-PEEK surface hinder the formation of the protective DPPC film and the CF-PEEK surface is thus subject to faster wear.

关 键 词：polyetheretherketone(PEEK) carbon fiber-reinforced PEEK(CF-PEEK) dipalmitoylphosphatidylcholine(DPPC) orthopedic implants self-assembly 

分 类 号：TH132.41[机械工程—机械制造及自动化] TH117.1