DEVICE FOR APPLICATION OF COATINGS IN VACUUM Russian patent published in 2002 - IPC

FIELD: application of coatings in vacuum. SUBSTANCE: the device has an expendable metal cathode positioned in the body used as an anode that carries a solenoid. The anode is connected to a vacuum chamber, electrically coupled to it and connected to a DC arc-discharge power source, parallel-connected to which is a capacitor with a ballast resistor. Coupled to the ignition unit is an igniter, having an igniter electrode and a dielectric insert. The expendable metal cathode and the anode are positioned eccentrically relative to the solenoid axis, the cathode and anode axis is shifted towards the area for arrangement of the workpiece, that is positioned outside the zone of visibility, from the cathode by a value approximately equal to the diameter of the expandable metal cathode. The device has a diode parallel-connected to the resistor and in opposition to the polarity of the arc-discharge power source, and ribs are made on part of the body inner surface, they are designed for prevention of reflection of macroparticles of the applied coating to the area of the workpiece, the ribs are positioned on the section of the body inner surface from the vacuum chamber to the level of the igniter electrode. EFFECT: enhanced quality of the coating with a low degree of surface roughness and a simplified construction of the device. 8 cl, 2 dwg