METHOD AND APPARATUS FOR GAS-DYNAMIC DEPOSITION OF COATING Russian patent published in 2004 - IPC

FIELD: gas-dynamic deposition of coating from powdered materials, may be used for manufacture and repair of metal products.

SUBSTANCE: method involves heating pressurized gas and supplying heated pressurized gas into supersonic nozzle; providing supersonic gas flow in nozzle; introducing into said flow powdered material including metal particles; accelerating powdered material particles in nozzle by said flow with following braking of said flow in nozzle to speed less than supersonic speed; heating particles of powdered material by gas flow having speed less than supersonic speed; directing flow of particles onto surface to be processed. Apparatus has supersonic nozzle having throat 5, widened portion 6 followed by elongated portion 7 with substantially uniform section area. Nozzle may have portion with increased section area instead of elongated portion 7, said portion having area 10P times as large as area of throat 5, where P is full pressure of pressurized gas at inlet end of nozzle, expressed in MPa.

EFFECT: increased powdered material spraying coefficient due to increased temperature of particles deposited onto surfaces.

48 cl, 14 dwg, 4 ex