INVESTIGATION OF SURFACE STRUCTURE, CRYSTALLOGRAPHIC TEXTURE, MICROTOPOGRAPHY OF FUNCTIONAL COATINGS DEPOSITED USING FLEXIBLE TOOL AND SOME APPLICATIONS. Part 1. Surface structure, crystallographic texture, microtopography of copper and brass coatings deposited on steel base using flexible tool

The paper focuses on metal surface nanostructuring and functional coating application using a flexible tool – rotating wire brushes (RWB). This process called friction cladding implemented on lathes, grinders and other machine tools using ordinary tooling or manual angle grinders. Metallographic investigation of surface layers used 3×20×100 mm plates made of Steel 08 as study samples. Coatings were applied using the surface grinder where RWB was installed instead of an abrasive disk together with a coating material feeding device. Cylindrical samples (Steel 50) 20 mm in diameter were machined by angle grinders installed on the sliding carriage of the lathe. Optical microscopes and the JSM-6490 LV electron-scan microscope (ESM) were used for metallographic research. Electron microscopic studies were performed by replica technique using the Tesla BC-613 electron microscope. X-ray diffraction analysis was performed on the Dron-3 diffractometer. Measurements and surface roughness analysis were performed according to the GOST R ISO 25178 method on the Bruker Contour GT K1 unit. The surface structure, texture and microtopography of copper and brass coatings deposited using a flexible tool on a steel base were investigated. The average coating thickness was 20–25 μm, microhardness was about 6800 MPa for the copper coating and 9000 MPa for the brass coating with particle sizes ranging from 0,3 to 0,6 μm. The crystallographic texture of the coating reproduces the texture of the steel base material. Investigation of sample surface microtopography before and after coating showed that the brass coating substantially smoothes out the surface, but the initial microtopography is changed insignificantly. Copper coating microtopography differs substantially from the initial one.

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