The Structure and Properties of a Cr 3 C 2 -Ni Coating Deposited by a High-Velocity Plasma Jet onto a Copper Substrate

Chromium carbide-nickel coatings were deposited onto a technical grade copper substrate by means of a high-velocity plasma jet of a plasmatron operating in specially selected regimes. An analysis of the coatings showed evidence of the formation of a Ni-based solid solution, a complex chromium carbide (Cr 7 C 3 ), and an fcc crystal phase with a lattice parameter of 3.614 A. The surface of the coatings exhibits a characteristic relief resulting from a dynamic interaction between melted and fused particles of the initial powder. The local hardness on some areas of the surface and in depth of the coating reaches 66 ∠ 4.5 HRC, while the coating adhe- sion strength varies from 25 to 300 MPa. © 2003 MAIK "Nauka/Interperiodica".