Structure and properties Ag—C coatings sprayed by electrical explosion on copper substrate

Abstract

In the presented article it was studied the structure and the properties of the C-Ag coating electrical explosion sprayed on copper substrate. It was found that obtained coating, from 7...200 µm thick, has complex relief. Graphite is represented as plate shape structures and sub-nanosized globular particles. There are also copper oxide particles in the coating. A transition area with a thickness of 100...150 nm, which has a complex structure, is formed on the boundary between the coating and the substrate. The silver grains in the coating have a platelet structure, and the copper substrate has a subgrain structure. The hardness and Young's modulus of the "coating (Ag-C)/(copper) substrate" system increase with the distance from the surface to the boundary between the coating and the substrate. The coating wear parameter is 2.3 times less compared to the copper substrate. The coating friction coefficient is equal to the substrate friction coefficient.