Loza T. Preliminary preparation of the surface layer and ensuring detonation coatings quality of aircraft engine parts

Оbject of research - the processes of formation of a complex of physical and mechanical properties of surface layers during pre-treatment and gas detonation spraying. The purpose of the study is to develop a comprehensive multi-operational technology, which includes preliminary preparation of the surface layer, followed by the application of detonation coatings. Research methods - general equations of mechanics of continuous media; fundamental foundations of the theory of plastic flow of metals; theoretical studies of the kinematics of a particle accelerated by a gas stream in a nozzle; raster electron microscope with low vacuum camera and energy dispersion microanalysis system REM-106; profilometer-profilograph of model 210 of the Caliber plant. Results - recommendations are developed, the use of which allows to expand the technological capabilities of the process of gas detonation treatment of titanium alloys, such as VT1-0, VT3-1, VT22, due to rational modes of jet abrasive treatment, which provide surface roughness Ra = 1.63… 4 , 25 μm and the optimal microhardness of 4.8… 5.1 GPa, which significantly improved the structural characteristics of the transition layer of the coating - the main material and provided satisfactory adhesion of the coating .; on the basis of experimental researches recommendations on a choice of parameters of modes of gas detonation spraying for pairs are developed: covering of the PS-12NVK-01 brand - titanium alloys VT1-0, VT3-1, VT22 providing reception of a uniform covering with granular structure, without accurate borders with the maximum size pores of 13 μm and a minimum of 2.8 μm. Novelty - for the first time analytical dependences describing changes in the velocity of a particle along the path of the Laval nozzle, as well as the velocity in contact with the substrate, were obtained in Lagrangian coordinates; the functional connection between the power characteristics of the deformation process and the parameters of the mode of jet-abrasive processing is specified; for the first time an analytical dependence was proposed, which is based on the density of dislocations and is determined by the intensity of deformations. Degree of implementation - the main results of the work are introduced into the educational process of the Department of Aircraft Engine Production Technology of the National Aerospace University "Kharkiv Aviation Institute"; confirmed by experimental and industrial tests on "Motor-Sich" (Zaporozhye) and accepted for implementation with an economic effect of 350 thousand UAH. for a year. Field of use - production of aircraft engines, mechanical engineering.