The influence of technological factors on the adhesion strength of gas-thermal coatings to the base
DOI:
https://doi.org/10.31471/1993-9965-2023-2(55)-16-24Keywords:
електродугове напилення; основа; методи підготовки поверхонь; режими напилення; віброелектроіскровий спосіб підготовки поверхні; міцність зчеплення покриття з основоюAbstract
Improving the quality of the surfaces of machine parts by improving the physical and mechanical characteristics of the upper layers of metals and alloys is an urgent task of modern engineering. In addition, when applying progressive technological processes, efforts should be made to increase processing productivity and save metals. Research, development and implementation of processes substrate on complex action on the surface of processed parts contribute to the solution of these problems. In the presented work, some issues related to the research of the processes of improving the operational properties of metal surfaces are considered, in particular, the effect of various methods of preliminary preparation of the surfaces of parts and modes of the process of electric arc spraying of metal (stainless steel, aluminum, zinc) coatings on the strength of their adhesion to the steel base is considered, and a refined test methodology. These questions were studied with the help of an experimental mechanized electrometallization unit, created on the basis of a lathe and screw-cutting machine. It is shown that the following modes of electric arc metallization have a significant influence on the quality of sprayed coatings: the distance from the arc burning zone to the treated surface, the pressure of the spraying air, voltage and current. The adhesion strength of the obtained coatings also depends on the method of preliminary preparation of the ubstrate material. Relatively better results in terms of adhesion strength were obtained with the preliminary creation of a relief of the "torn cut" type on the treated surface, a slightly lower value with preliminary electrospark treatment. The last method of preliminary preparation of the sprayed surface should be considered the most promising from the point of view of its versatility and productivity.
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