Deep-cryogenic treatment improves microstructure of P/M high-speed steel in terms of producing finer needles-like martensitic structure. Finer microstructure results in higher surface hardness and better wear properties, both abrasive wear resistance and galling resistance against stainless steel. Both cryogenic treatment time and austenizing temperature have an influence on tribological performance of P/M high-speed steel.
COBISS.SI-ID: 742314
In an international SCI journal, we published the results of the impact of oil viscosity on tribological response of DLC coatings, and we systematically evaluated the unusual tribological behavior of these surfaces in comparison with conventional engineering materials, such as steel.
COBISS.SI-ID: 11139611
We developed generally applicable procedures for the estimation of slip of the lubricant on non-fully wetted surfaces. Such procedures have not yet been presented in the literature. With the use of experimental data, the method provides the rate of slip between the liquid (lubricant) and the surface for macroscopic engineering contacts.
COBISS.SI-ID: 10955035
The use of a Nd:YAG pulse laser allows generation of micro-pores with different characteristics, where the laser parameters correlate with the dimensions and the quality of the topography of the resulting micro-geometries. For point contact (ball) micro-pores with a diameter in the same range as contact width results in increased friction, while for flat contact, where several hundred micro-pores are present in the contact, laser surface texturing will result in friction reduction for lower texturing densities and higher sliding speeds.
COBISS.SI-ID: 11027227
Roughness parameter Ra is not the most important parameter effecting tribological properties of contact surfaces. Good correlation with friction was found for Rku and Rsk roughness parameters. Increase in parameter Rku leads to decrease in friction under boundary lubrication, while for parameter Rsk getting more negative also results in lower friction. This shows the potential for using Rsk and Rku parameters as design parameters for contact surfaces.
COBISS.SI-ID: 10962459