RELIABILITY OF MACHINE PARTS UNDER GAS-ABRASIVE WEAR

Purpose. Analysis of patterns of gas-abrasive wear of the material of aircraft compressor blades, finding protective coatings that provide effective wear reduction, and providing recommendations on the optimal type of protective coating. Research methods. During the study, a device was used, the design of which allows changing the parameters of gas-abrasive wear within wide limits, which would best reproduce the wear conditions existing in aviation compressors. Samples of 14X17H2 steel and protective layers applied to it by nitriding, nitrocementing, and cyanidation were tested. The study was conducted using metallographic analysis in order to identify the structure that provides optimal resistance to gas abrasive wear. Results. Analysis of the nature and amount of wear of the investigated materials was carried out in the flow of free abrasive depending on the speed of the abrasive flow and its angle of attack. The degree of wear reduction of 14X17H2 steel when using protective diffusion coatings was determined. On the basis of a comparative evaluation of the quantitative characteristics of protective layers, a coating that optimally reduces the wear of 14X17H2 steel during gas abrasive wear was determined. Scientific novelty.The value of the angles of attack corresponding to the maximum wear for both 14X17H2 steel and the proposed protective diffusion coatings was determined. Based on metallographic analysis, the composition (type, size, and location) of dispersed particles of the surface layer structure has been determined to provide optimal resistance to gas abrasive wear. Practical value. The results of this work can be used by designers who are engaged in the development of products that operate under gas-abrasive wear conditions. Based on the obtained dependencies of the studied materials on the angle of attack, it is possible to select the optimal material and configuration of the product in such a way that the wear was minimal.