Rezumat
CZU 544.558+66.088
DOI https://doi.org/10.5281/zenodo.4456624
The effect of anodic boriding regimes on the structure of the modified layer and the wear characteristics of the treated titanium alloy was studied. The layer structure, its phase and elemental composition were investigated using X-ray analysis and electron microscopy with energy dispersive analysis. The surface roughness and microhardness distribution were measured by standard methods. The wear characteristics of the borided alloy were studied under dry friction conditions against bearing steel as counter-body. It was found that the modified layer contains titanium dioxide (rutile) and a solid solution of boron in titanium with precipitates of the beta phase. A fivefold enhancement of the wear resistance of the alloy due to an increase in hardness and a decrease in roughness is reached by anodic boriding in a solution of boric acid and ammonium chloride at 850ºC–900°C for 5 minutes.
Keywords: plasma electrolytic treatment, boriding, alpha- and beta-phases titanium alloy, microstructure, surface roughness, microhardness, friction coefficient, wear resistance.