Shear localization in ultralow wear of PEEK/UPE composites

被引：0
|
作者：
Sun, Wei [1 ,2 ]
Chen, Tianci [2 ]
Chen, Tao [2 ]
Liu, Xiaojun [2 ]
Ye, Jiaxin [1 ,2 ]
机构：
[1] Nanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[2] Hefei Univ Technol, Inst Tribol, Hefei 230009, Anhui, Peoples R China
来源：
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2024年 / 187卷
基金：
中国国家自然科学基金;
关键词：
Polymer-matrix composites (PMCs); Wear; Mechanical properties; Surface analysis; INSTRUMENTED INDENTATION; PTFE; FRICTION; BEHAVIOR; TRIBOCHEMISTRY; HARDNESS; MODULUS; XPS;
D O I：
10.1016/j.compositesa.2024.108484
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Certain polytetrafluoroethylene (PTFE) composites can form a shear localization structure at the sliding interface by developing running and transfer films, thus achieving an ultralow wear rate of similar to 10(- 7) mm/Nm. However, PTFE, as a per- and polyfluoroalkyl substance (PFAS), raises significant biological toxicity concerns in tribological applications. Based on the shear localization hypothesis, we propose replacing PTFE with ultrahigh- molecular-weight polyethylene (UPE) at the tribo-interface and utilizing PEEK/UPE composites as PFAS-free, ultralow-wear candidates. Wear tests demonstrate that PEEK/UPE composites offer superior anti-wear performance compared to traditional ultralow-wear composites under various conditions. Micromechanical measurements reveal enhanced mechanical properties of tribofilms, which resulted in the ultralow-wear shear localization at the PEEK/UPE tribo-interface. Surface analysis suggests that mechanochemically carboxylated UPE and PEEK polymers play a critical role in maintaining stable shear localization. Contact mechanics calculations further indicate that the robustness of the shear localization of PEEK/UPE composites is attributed to the higher van der Waals force of UPE against steel counterface than that of PTFE.
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页数：13
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