The wear resistance and feasibility of applying soil rippers have been studied after surfacing for use in the clayey soil. The study illustrates laboratory and production research of standard and nove

The influence of welded layers composition on the abrasive wear mechanism of friction couples “hard layer-steel” is analyzed. Strength, surface morphology, chemical and structural composition, abrasive wear resistance of welded layers are investigated. When cutting low carbon and chromium content layers with abrasive particles, the wear predominates there as it does under plastic deformation, while in refractory metal layers brittle decomposition takes place. Alloying carbon hard layers with chromium, silicon, boron and refractory metals (Fe-C-Si-Cr, Fe-C-Si-Cr-B, Fe-C-Cr-Si-Nb-W-Mo-B), the friction couples wear may be reduced by 53–56% compared to boron micro-alloyed hardened steel. Abrasive wear of high carbon content layers alloyed with chromium, silicon, boron and refractory metals is selective due to formed Fe₆W₆C (Cr, Fe)₇C₃, Mo₂C, NbC carbides. Thermal treatment of high carbon content layer alloyed with refractory metals leads to conglomeration of carbides and reduction of abrasive layers wear up to 35.5%.

The wear of plough points of different structures and materials in soils with different moistures, hardnesses, and levels of stoniness was studied. It was

The appearance, evolution, and proliferation of electric-vehicle motors have introduced new challenges for lubricants. The appearance of electric currents in the shafts of electric motors can dramatically change the original properties of lubricated contacts, leading to mechanism failure. Understanding and controlling this phenomenon can be advantageous for lubrication, but investigating the lubricants requires specific equipment and conditions. Therefore, in this study, we introduced a ball-on-plate reciprocating tribometer capable of applying electric voltage to the elements of the friction pair and measuring the electric contact resistance (ECR) as feedback. Mineral-based paraffin oil was used as a lubricant in this study. The coefficient of friction (COF), wear, surface morphology, and composition were analysed. It was found that high-speed ECR measurement could give valuable information regarding the lubrication conditions in reciprocating friction pairs. This study shows that even tiny currents flowing through the tribo contact can alter the lubricating conditions. Moreover, the polarity of the applied voltage is also of great importance. Applying negative voltage to the harder surface can significantly increase wear if the tribo-film is based on surface oxidation.