According to the thin-wall special-shaped
metal sealing ring surface
toughening CoMoCrSi
coating, a double-layer
glow plasma surface
metallurgy technology is utilized, a CoMoCrSi
alloy serves as a target material, a
nickel-based high-temperature
alloy thin-wall special-shaped
metal sealing ring serves as a workpiece, and the thin-wall special-shaped
metal sealing ring surface
toughening CoMoCrSi
coating is obtained through three steps. The method comprises the following steps: 1, regulating and controlling surface micro-area plastic deformation of a metal sealing ring by controlling
current density, and realizing gradient change of roughness from a boundary to a center by virtue of an edge effect; secondly, remelting of the protruding position of the plastic deformation area is caused through the hollow
cathode effect, target
material element diffusion is accelerated, and interface mechanical-metallurgical bonding is achieved; and thirdly, the surface
toughening CoMoCrSi
coating with the gradient structure is formed through deposition. The mechanical
occlusion depth between the coating and a workpiece is 2-6 microns, the thickness of a deposition layer is 10-30 microns, the thickness of a metallurgical
diffusion layer is 1-5 microns, and the coating is high in
toughness, simple and convenient in process, high in production efficiency, low in cost and suitable for
batch processing.