This work focuses on the effect that different asperity peak identification criteria have on asperity peak properties (number, radii and heights) for calculation of real contact area on rough surfaces. 3 different criteria are applied on 5 different surface roughnesses in the broad engineering range from Ra = 0,003 µm to Ra = 0,70 µm. The number of asperity peaks, their radii and heights are analysed in terms of selected surface roughness and selected criteria. The results show, that 3PP criteria, unlike 5PP and 7PP, have much more trustworthy physical background as number of asperity peaks decreases with increasing surface roughness.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 12560923Poly-ether-ether-ketone (PEEK) is a thermoplastic high-temperature polymer with excellent mechanical properties, stability at high temperatures and simple thermoplastic forming. MoS2 is solid lubricant used for friction reduction. In its unfilled form PEEK has a high coefficient of friction that would be reduced with incorporation of MoS2. Tribological measurements were done with 7 different concentration of MoS2 and with 4 different sintering temperatures. Measurements were done on tribometr CETR-UMT 3, with reciprocal sliding at different speeds and loads. Steel 10 mm in radius ball was used as counter material. Average stable coefficient of friction was calculated.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 12733211Poly-ether-ether-ketone (PEEK) is a thermoplastic high-temperature polymer with excellent mechanical properties, stability at high temperatures and simple thermoplastic forming. Sintering is a thermoplastic method that results in higher materials’ density. Higher density influences on other materials properties – hardness, elastic modules. All of these properties are connected to tribological properties. Purpose of this research is to establish connection between sintering temperature and tribological properties of PEEK and to determine most suitable temperature for manufacturing samples.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 12732955