Peculiarities of Centrifugal Induction Melting of Tin Bronze with Nanoscale Additions

Abstract

The article presents the physico-mathematical modeling of the dynamic effect of the melt on a nanoscale particle during the formation of coatings by induction centrifugal surfacing. The forces acting on the particle in the liquid melt during the isothermal holding under induction prismatic welding are determined. A dependence is obtained that determines the rate of displacement of nano-sized particles from the initial position in the liquid melt during surfacing of the coating. A method for the formation of coatings with nano-sized additives is developed by induction centrifugal surfacing, including preliminary preparation of the bronze charge. It is shown that the introduced nanoscale additive in an amount of 4 wt.% to the powdered charge of tin bronze, according to the proposed method, leads to its phase-structural transformations, which allows achieving higher anti-frictional properties of bronze, since a uniform distribution of the solid structural component throughout the whole coating is ensured. The detected factors lead to an increase in the tribotechnical properties of coatings — a reduction in the coefficient of friction with simultaneous increase in wear resistance and micro-hardening of coatings.

Keywords

• induction surfacing
• induction heating
• bronze charge
• nanoscale additives
• dynamic action
• antifriction coatings