Abstract No.:

Computer modeling of cermet coatings evolution under their pulsed high-energy post-treatment

Oleg Solonenko* / Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Russia
Alexey Golovin / Khristianovich Institute of Theoretical and Applied Mechanics, SB RAS, Russia

Thermal as well as plasma spraying of nano- and submicrostructured cermet coatings made of composite powders which particles consist of hard ultra-fine inclusions of chemical compounds in matrix of metal alloys of given chemical composition gives wide opportunities of creation of wear-resistant coatings for extreme application conditions. However, the high content of inclusions of carbide phase in cermet particles is the reason of their low level deformation at impact with substrate or coating surface that results in rather high porosity of coating sprayed.
Decrease in porosity of cermet coating at simultaneous increase of its bonding strength with substrate is possible by means of subsequent heat treatment. The problem consists in binder melting at minimum impact on carbide inclusions and substrate. It is possible to realize in practice high-temperature treatment of powder coating, practically without volume heating of the base, at its pulsed high-energy processing. Because the experimental go through this technology is rather labor- and power-consuming procedure, computer modeling and optimization are very perspective.
With use of the developed physical model of porosity evolution at pulsed high-energy treatment of coating, the computing experiments were carried out, which allowed to optimize power density in a single pulse and its duration depending on thickness and porosity of cermet coatings, and also volume ratio of carbide inclusions and their size.

<= go back