Аналіз процесів ударно-абразивного зношування робочих органів дорожньо-будівельних машин

Abstract

Impact-abrasive wear is one of the most dangerous and common types of damage to road construction machines. According to statistics, about 50% of all repair work to restore the performance of machines is carried out due to this type of wear. The working bodies of those machines that work with high pressures are most worn out. Not only the wear processes themselves, but also their unevenness in different localization zones pose a particular danger to the functioning of road machines. High wear resistance is ensured by the high hardness of the surface layers, which better counteract the rapid abrasion of the surface layers by abrasive particles. The local difference in the friction coefficient is the cause of uneven wear on the surface of the working body from friction, which is observed under conditions of abrasive wear. The presence of tungsten carbides in the mechanical mixture of self-fluxing powders [4] of nickel-based alloys (NiCrBSi), which are fixed by X-ray diffraction, does not embrittle nickel during sputtering due to saturation with the carbon present in them. Borides present in the core (NiCrBSi) can form nickel borides when interacting with the nickel shell and embrittle the matrix.