COATING FORMATION METHOD, AND PLANT FOR ITS IMPLEMENTATION Russian patent published in 2013 - IPC C23C24/08 B22F3/105 

FIELD: metallurgy.

SUBSTANCE: on working surface of an item there formed is a coating by means of subsequent layer-by-layer application of fluid powder suspension onto surface of the treated part of the item and its scanning with a laser beam. To the chamber of the scanning plant there introduced through a gland is some part of the item for formation of a coating on it. Suspension is poured into the chamber till the item is submerged into it by 2/3-3/4 of the diameter. The items are turned by means of automatic control by means of an actuator so that an edge strip coated with suspension turns out to be in upper part in the laser emission zone. The first strip is scanned in the direction that is longitudinal relative to the item; then, the turn is made through width of the strip considering the overlap of the strips and the second strip is scanned in return direction and then, till the marked thickness of the coating is achieved. Suspension of the following composition, wt %, is used: %: carbon-containing liquid material (C₇H₁₄, CCLI₄) - 30-50; powder-like copper with particle dispersity of 0.5-1.5 mcm - 0.8-3; graphite powder - 0.4-0.6; carbonyl iron powder of grade P-100 with dispersity of 50-800 nm is the rest. Particles with dispersity of 50-300 nm are not less than 50%.

EFFECT: increasing wear resistance of a bearing zone of an item.

3 cl, 2 dwg