The effect of surface phenomena on the processing of solid materials. I. Theoretical basis of surface phenomena of solid materials

摘要

The functions of friction and adhesion in the processing of solid materials were evaluated in our work. The first part of our study dealt with the theoretical basis of these phenomena. The work of Podczek was used as a guideline. The negative and positive effects of these parameters were emphasized. The types of adhesion were discussed. The different types of forces (capillary, Lifshitz-van der Waals, electrical, etc.) and several other parameters (surface free energy, roughness, particle size and shape) causing these effects were analysed. Different mathematical models which can be used for the determination of surface free energy, adhesion force and spreading coefficient were considered.