Abstract
This article concerns the tribological properties of three selected polymer materials: polyamide PA6, polyethylene PE-HD and polyetheretherketone composite PEEK/BG during sliding against aluminium alloy EN AW-2017A in the presence of hydraulic oil HLP 68. The tests were carried out under contact pressure p of 3.5–11 MPa at ambient temperature T ranging from −20 °C to +20 °C. The dependence of kinetic friction coefficient μk on the two parameters was determined through tribological tests carried out using a pin-on-disc tribometer. A five-level central composite rotatable design (CCRD) was adopted for the experiment. All the test results were statistically analysed. The microhardness of the surface of the polymeric material was measured before and after the friction process. The surface was also examined under SEM. Temperature and contact pressure have been found to have a significant effect on the tribological properties of the tested sliding pairs. Relative to the applied friction conditions, the surfaces after friction showed rather heavy signs of wear.
Highlights
Introduction with Aluminium AlloyMaterialsIn recent years there has been a significant interest in the use of polymeric materials for machinery and equipment parts and components
The change in operating temperature affects the tribological characteristics of the polymer-aluminium alloy sliding pairs
This can be due to the different physical states of the materials (PE-HD was in a viscoelastic state, while PEEK/BG and PA6 were in a glassy state) in the analysed temperature range [12]
Summary
Introduction with Aluminium AlloyMaterialsIn recent years there has been a significant interest in the use of polymeric materials for machinery and equipment parts and components. Much of the relevant tribological research is devoted to the motion properties of the interacting surfaces of sliding pairs [1,2,3,4,5] These studies focus mainly on the interaction between steel and high-performance polymers, mostly in dry friction conditions and at room temperature. Mixed friction conditions can occur, for example, during the operation of hydraulic system components, such as valves and pumps, used in service vehicles working in temperate climates. The joints in these components are exposed to low temperatures (reaching −30 ◦ C) in winter, which can significantly adversely affect the interaction between the parts, especially if one of the interacting materials is a polymer or a polymer-based composite
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