Effect of crystallization behavior on wear properties of polytetrafluoroethylene composites modified by irradiation above melting point

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, COMPOSITES

Polymer Composites Pub Date : 2024-09-10 DOI:10.1002/pc.29026

Xiaojie Wang, Geng Huang, Shuangquan Zhou, Junyi Wang, Daming Wu, Xiaolong Gao

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Abstract

In this paper, the reasons for the improved wear resistance of irradiation‐modified Polytetrafluoroethylene (RM‐PTFE) and its composites above the melting point were investigated from the microcrystalline point of view by using methods such as crystallization kinetics, and it was found that the linear wear rate of RM‐PTFE was only 0.3 um/km, with a 1000 times increase in wear resistance, which was due to the transformation of its crystals from flake crystals that were easily dislodged to spherical crystals that were more resistant to abrasion. It was also found that the linear wear rate of Polytetrafluoroethylene (PTFE) with coke and graphite was 0.2 and 0.1 μm/km, respectively, and the abrasion resistance was further improved, which was attributed to the lowering of spherical crystal grain size by coke and graphite, which had better mechanical properties. These studies lay the foundation for future research on the frictional wear mechanism of RM‐PTFE above the melting point.Highlights

Irradiation‐modified PTFE above the melting point

Wear resistance of PTFE increases 1000 times

Changes in crystal morphology dramatically increase wear resistance

Use of crystallization kinetics to study the crystalline form of PTFE

Small grain size improves wear resistance

Abstract Image

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结晶行为对通过熔点以上辐照改性的聚四氟乙烯复合材料磨损性能的影响

本文利用结晶动力学等方法，从微晶角度研究了辐照改性聚四氟乙烯（RM-PTFE）及其复合材料在熔点以上耐磨性提高的原因，发现RM-PTFE的线性磨损率仅为0.3 um/km，耐磨性提高了 1000 倍，这是因为其晶体从容易脱落的片状晶体转变为耐磨性更强的球状晶体。研究还发现，聚四氟乙烯（PTFE）与焦炭和石墨的线性磨损率分别为 0.2 μm/km 和 0.1 μm/km，耐磨性进一步提高，这归因于焦炭和石墨降低了球形晶体的粒度，使其具有更好的机械性能。这些研究为今后研究熔点以上 RM-PTFE 的摩擦磨损机理奠定了基础。亮点熔点以上辐照改性 PTFE 的耐磨性提高了 1000 倍晶体形态的变化显著提高了耐磨性利用结晶动力学研究 PTFE 的结晶形态小晶粒尺寸提高了耐磨性

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来源期刊

Polymer Composites 工程技术-材料科学：复合

CiteScore

7.50

自引率

32.70%

发文量

673

审稿时长

3.1 months

期刊介绍： Polymer Composites is the engineering and scientific journal serving the fields of reinforced plastics and polymer composites including research, production, processing, and applications. PC brings you the details of developments in this rapidly expanding area of technology long before they are commercial realities.