DEVELOPMENT OF A TECHNOLOGY FOR FRICTIONAL HEATING OF THE SURFACE OF A PART BEFORE THERMAL SPRAYING OF A COATING

Abstract

This concept is based on the conversion of mechanical frictional energy into thermal energy directly in the area where the coating will subsequently form. This method heats only the spray zone without overheating the entire part, minimizing thermal deformation and structural changes in the base metal. This method provides thermal activation of the surface, as heating promotes the desorption of gases and moisture and accelerates diffusion processes during contact between the sprayed particles and the substrate. Friction treatment creates the necessary roughness for mechanical adhesion of coating particles to the substrate. Friction heating provides localized heating up to 500 °C in 8–12 seconds, which is 5 times faster than traditional methods. Adhesive strength increases by 30% due to the formation of juvenile surfaces and thermal activation. Analysis of the research results showed that roller speed and contact force have the greatest impact on surface temperature, while feed can be used as an effective tool for quickly regulating the thermal regime. Recommendations are provided for selecting process parameters and the sequence of surface preparation operations prior to thermal spraying.