Забезпечення надійності суднових технічних засобів при відновленні деталей газополум’яневим напиленням

When restoring worn surfaces of ship technical equipment parts by gas flame spraying (GFS), the quality of the restoration coating is affected by various technological factors, such as the spraying distance, spray angle, composition of the gas mixture and design features – coating thickness, porosity, which subsequently determine the quality of the coating, the service life of the restored parts and the reliability of the entire mechanism [1]. Studies of the performance of the «coating – base» system have shown that the main reason for their destruction is insufficient contact between the coating material and the restored surface. In other words, one of the most important operational characteristics of parts with GFS coatings is the adhesion strength of the coating to the restored surface – a criterion used in the practice of restoring parts during the repair process. The adhesion characteristics of the coating determine its performance. Therefore, the work experimentally established the influence of technological parameters of GFS on the performance of restored surfaces and their functional connection. The work considers the possibility of obtaining GFS - surfaces that are self-lubricating through the use of anaerobic sealant as a separate issue. The purpose of the article is to establish the influence of technological parameters of the GFS process on the quality of the restoration coating, which determines its performance and reliability of ship technical equipment as a whole. As a result of the study, the mechanism of influence of technological parameters (spraying distance, material, composition of the gas mixture, etc.) and design features (coating thickness, porosity) of the GFS process on the quality of the resulting coating was clarified. Taking into account the influence of technological parameters of the GFS process and their functional relationship on the quality of the resulting coating makes it possible to control the spraying process and obtain coatings with pre-set properties. The dependence of the total porosity and adhesion strength of GFS coatings on the spraying distance, the influence of the thickness of the coatings on the ratio of the through and total porosity of the coatings, has been established