Influence of Chromium Concentration on the Abrasive Wear of Ni-Cr-B-Si Coatings Applied by Supersonic Flame Jet (HVOF)

This research work studies the characteristics of wear and resistance composite powder coatings, deposited by supersonic flame jet (HVOF), which contain mixtures Ni-Cr-B-Si having different chromium concentrations—9.9%, 13.2%, 14%, 16%, 20%, at one same size particles content remaining elements. The coating 20% Cr does not B Si. Out each composite, coatings have been prepared without any preliminary thermal treatment substrate with up to 650 °C. tested under identical conditions dry friction over a surface solid, firmly-attached, abrasive using tribological testing device “Pin-on-disk”. Results obtained dependences hardness, mass wear, intensity wearing process, absolute relative on concentration friction. It has found out that for all leads decrease in intensity. Upon increasing diminishes it reaches minimal values 16% Cr. In case concentration, is increased, due absence components Si mixture, whereupon no inter-metallic structures are formed high hardness resistance. results analogues current literature they published authors.