The Properties of the Secondary Copper Alloy

Abstract

The use of scrap metal and waste solves the problems of preservation of natural resources, reduces energy and economic costs. In mechanical engineering, aluminum bronzes are one of the most popular, they are used in products where such indicators as high strength and ductility, wear resistance and corrosion resistance are needed. (Research purpose) The research purpose is to make a surfacing electrode from scrap copper alloys, to investigate the properties and the coating processes when applying this material. (Materials and methods) The article presents the microstructure and microhardness of the secondary bronze coating and the material for surfacing by the method of electroerosive dispersion of bronze scrap. A compact semi-finished product was created from the resulting powder using spark plasma sintering technology, which was applied to steel samples by electric spark treatment. (Results and discussion) The study of the microhardness of the coatings showed that the coatings made of bronze BrAZh9-4 have a microhardness approximately 1.7-2 times greater than sintered bronze, while the characteristics of the thermal influence zone and its presence directly depend on the substrate material and the electrode material. When getting materials by this method, the elemental composition can be adjusted depending on the required tasks. (Conclusions) The studied material after spark plasma sintering consists of finely dispersed spherical grains, which affects the application parameters and coating characteristics. When applying a coating with the same electrode to different grades of steel, the coating changes with the same parameters of the material application.