The mechanical properties, adhesion and roughness of polymer coatings depend on many factors, including the unevenness of the substrate surface. Nevertheless, the influence of the substrate surface roughness is related to the coating type and substrate material and the used deposition method. Therefore, the effect of the surface roughness of a structural steel substrate on the mechanical properties of a PEEK coating is ambiguous. The indentation tests conducted show that, at a specific load of the indenter, the roughness of the steel substrate surface does not significantly affect the Vicker’s hardness of the tested PEEK coatings. The average Vicker’s hardness and elastic modulus are approximately 300 MPa and 5.6 Gpa, respectively, at the lowest of the applied loads, regardless of the surface roughness level of the steel substrate. Nevertheless, the surface roughness of the steel substrate after fine grinding of Ra = 0.21 μm, compared to the polished one with Ra = 0.005 μm, meant that adhesion improved, and the scratch hardness increased by approximately 130 to 370 [MPa] of the PEEK coating.
In this work, a comparative analysis of the micromechanical and tribological properties of polyetheretherketone (PEEK) in bulk and coating form was performed. The PEEK 708 coating was applied on a Ti6Al4V titanium alloy flat specimen using the electrophoretic deposition method. The micromechanical properties were determined through indentation tests performed using the Vickers method and scratch tests. Based on research work, the Vickers hardness (HV), elastic modulus (E), scratch hardness (HS), and Micro Mar Resistance (MMR) were determined. The tribological properties were defined by the coefficient of friction (fs and fw), which was obtained in scratch tests and ball-on-disk tests. The results of this research indicate, despite the slightly higher Vickers hardness (HV) of the PEEK 708 coating (HV=350 MPa, HS=300 MPa) relative to PEEK bulk (HV=300 MPa, HS=210 MPa), that there is an almost 40% difference between the scratch hardness (HS) values of these PEEK forms. It appears from the result analysis in this paper that testing methods to determine the micromechanical and tribological properties of PEEK in monolith form can be used for both PEEK coatings. Under certain test conditions, the impact of the substrate properties on the results of the PEEK 708 coating was not found.
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