МОЖЛИВОСТІ ПОКРАЩЕННЯ ЯКОСТІ ПЛАЗМОВОГО НАПИЛЕННЯ ПРИ ЗМІЦНЕННІ ТА ВІДНОВЛЕННІ ВУЗЛІВ І ДЕТАЛЕЙ СІЛЬСЬКОГОСПОДАРСЬКОЇ ТА ІНШОЇ ТЕХНІКИ

Abstract

The work is devoted to finding ways for improving the mechanical properties of the plasma-sprayed layer on the surface of parts and assemblies of agricultural and other equipment in order to give them certain qualities in the restoration or strengthening.It is determined that there are a number of methods and ways to restore and strengthen components and parts, where electric arc surfacing, including flux electrode wire, is the most common. This technology has a number of advantages but there are a number of disadvantages that do not allow electric arc surfacing to be used in some cases, in particular in the surfacing of sheet material and more.An alternative to arc surfacing, or its supplement, is plasma spraying, which can eliminate the existing shortcomings of surfacing. But spraying has its drawbacks, one of the main of which is the weak adhesive properties, accompanied by a low value of the adhesion of the powder that is sprayed to the surface of the part.The search for a way to increase the adhesion of the sprayed layer to the surface of the assembly and the partled to the choice as a component of the self-fluxing alloy, which gives the sprayed layer strength and reduce unwanted inclusions.But an even greater effect can be achieved by introducing into the powder being sprayed, a special slag, which surfacing from melting further increases the adhesion of the sprayed layer to the surface.A mathematical model of the influence of the amount of flux and force parameters of the plasma on the adhesion parameter is developed, and the optimal parameters of the process and materials on the adhesion characteristics are found by mathematical methods.This is confirmed by experimental studies and can be used in practical work in the implementation of real technology -plasma spraying.A large number of specimens of a specialshape made of 40X steel were used for spraying experiments. Experimental work was carried out on the installation, which was upgraded to improve the process. Control of energy parameters of sprayingwas applied.To make it clearer to choose the optimal dependence of the strength of the plasma coating on the main parameters of the process and determine the maximum value of strength for the example built a graph of dependence, which is based on certain regression models.