Preparation of Anti-Friction and Wear Resistant Coatings in the Isostatic Compression by the Centrifugal Forces and Induction Heating of Spherical Powder Bronze with Inclusions of Finely Divided Boehmite

摘要

The report provides a phenomenological model of the powder coating production and a method of deposition of spherical bronze powders in an elastic compression by the centrifugal forces and with an induction heating. Based on the analysis of temperatures during the induction heating, the study shows the possibility of chemical reactions that allow the finely dispersed boehmite to convert with induction heating into nanoscale alumina. The report presents the study results on the structure, mechanical and tribotechnical properties of coatings deposited on steel substrate in the process of induction of metal charge, consisted of spherical bronze powder with the fraction size of 200-400 microns with inclusions of finely divided (less than 5 microns) boehmite in the amount of 0 mass% to 10 mass%. Experiments proved that introducing this amount of boehmite to the described metal charge allows changing of coatings structure and that the amount of 2 mass% to 3 mass% of boehmite provides the best tribotechnical properties of the powder coating.