Abstract
Phenomena occurring in the contact area between two mating bodies are characterised by high complexity and variability. Comparisons are usually made between parameters such as the coefficient of friction, friction force, wear and temperature in relation to time and friction path. Their correct measurement enables the proper evaluation of tribological properties of materials used in the friction pair. This paper concerns the measurements of basic tribological parameters in the friction of selected polymer composites. Knowing the tribological properties of these composite materials, it will be possible to create proper operating conditions for kinematic friction pairs. This study investigated the coefficients of friction, friction force and temperatures of six polymer composites: cast polyamide PA6 G with oil, PA6 G with MoS2, polyoxymethylene POM with aluminium, polyethylene terephthalate PET with polytetrafluoroethylene PTFE, PTFE with bronze, and PTFE with graphite. The friction surface was also examined using an optical system and computer software for 3D measurements. As a result, PA6-G with oil was found to be the best choice as a composite material for thin sliding coatings.
Highlights
Friction is one of the most common phenomena in the world around us
Friction processes are accompanied by wear and tear of friction pair elements, which makes the operational efficiency of these elements worse [1]
The tribological wear of materials is a result of abrasion, cracking and crushing of material particles, adhesion of the mating element surface, and tribo-chemical reactions occurring on the surface of friction, which is discussed in many works [2,3,4,5]
Summary
Friction is one of the most common phenomena in the world around us. It is one of the main processes taking place between the mating elements of machines and devices. The complexity of processes occurring in the area of contact between mating elements makes it necessary to consider many different tribological parameters and mechanical properties of materials. Polytetrafluoroethylene (PTFE) based composites with different fillers [25,26] are characterised by good tribological properties. The tribological tests showed that the lowest wear was observed for the polytetrafluoroethylene-based composite containing 25% bronze powder and 15% graphite and for the composite with a 25% carbon content [27]. [28] showed very good tribological properties of the PTFE composite reinforced with carbon fibres and graphite. Higher friction coefficients were observed under dry friction conditions [30] Another polymeric material used in tribological applications is polyoxymethylene (POM). Practical applications for the tested materials in machine design and research were presented in the works [33,34,35,36,37,38,39,40,41,42,43,44]
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