| 摘要 |
FIELD: technological processes.SUBSTANCE: invention relates to the field of plasma treatment of materials, in particular, for application of coatings, and may find application in plasma metallurgy, plasma chemistry and machine building industry. In a plasmatron comprising a cathode with a cylindrical thermoemission insert, a nozzle-anode, an insulator, a swirling unit with tangential holes, a water cooling system, a channel of simultaneous introduction of a plasma-generating gas and powder, the operation of arc is organised not in the subsonic part, but in supersonic part of the nozzle-anode. At the same time the cylindrical thermoemission insert of the cathode is made in the form of a central body of the nozzle-anode, the summary area of cross sections of tangential holes of the swirling unit is equal to the area of a slot clearance between the wall of the nozzle-anode and the cylindrical thermoemission insert of the cathode, the end of which matches the start of the expanding supersonic part of the nozzle-anode.EFFECT: increased reliability of operation of a plasmatron in application of coatings from powders of substances with different melting temperature, simplified design of a plasmatron and improved operating and physical and mechanical characteristics of coatings.2 dwg |
