Studying the surface and microstructure of a chromium coating with nanodiamond particles deposited on monolithic composite with layered structure
Electrochemical coatings of chromium modified with nanodiamond particles applied directly on niobium-aluminum alloy were obtained. Nanodiamond particles produced by detonation synthesis were used. Chromium coatings were deposited on a monolithic composite with a complex structure based on niobium and aluminum alloys, called later matrix for short. Standard chromium electrolyte and electrolyte with nanodiamond particles concentration of 10 g/l were used. Analyzes were performed by Scanning Electron Microscope system of Bruker Inc. and the Polyvar Met metallographic microscope. The microhardness was measured using a PolyvarMet 4000 microhardness tester. The obtained results of the microhardness were 788 kg/mm2 in the chromium layer and 168 kg/mm2 and 692 kg/mm2 in the matrix. The microstructural and SEM-EDS analysis showed the presence of two intermetallides Nb2Al and Nb3Al in the monolithic composite of niobium aluminum matrix. The average thickness of the chromium coatings modified with nanodiamond particles is 55 μm.