VACUUM ARC METHOD OF COATING APPLICATION Russian patent published in 2019 - IPC C23C14/35 C23C14/06 C25B11/04 C25B11/10 C22C27/04 H01J1/48 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of applying coatings with vacuum-arc evaporation and can be used in production of tribotechnical articles and a metal cutting tool with functional coatings from alloyed carbide compounds. Target cathode is made of powder mixture by its pressing into workpieces and their vacuum sintering. Powder mixture consists of the following components, wt%: Cr₂C₃ chromium carbide 0.5–20, titanium carbide TiC 0.5–20, silicon carbide SiC 0.3–10, cobalt Co 8–12, nickel Ni 0.5–5, iron Fe≤0.1, molybdenum Mo ≤0.1, sulfur S≤0.1, WC tungsten carbide is the rest. Powders are mixed in the drum at rotation at rate of 300–400 rpm and temperature of 40–80 °C for 120–900 s, is added to mixture 4–12 wt% plasticiser while stirring for 10–12 minutes at rate of 30–40 rpm and temperature of 24–35 °C, granulated to granules size 50–300 mcm and dried at temperature of 90–110 °C, pressing of blanks is carried out at pressure of 30–35 MPa for 20–40 s to porosity <1 %, vacuum sintering is carried out in two stages, first, billet is heated 100 minutes before temperature of 900–1,000 °C is held for 5–12 minutes, then heated for 130 minutes to temperature of 1,450–1,600 °C, held for 120 minutes and cooled first to 800 °C for 60 minutes, and then together with the furnace to room temperature. Application of coating includes heating of article to temperature of 430–450 °C, ignition of vacuum-arc discharge, formation of cathode spot of vacuum arc, formation of magnetic field controlling cathode spot and change of curvature of formed magnetic field during coating application.

EFFECT: technical result is improved wear resistance, durability and corrosion resistance of coating with simultaneous action of abrasive loads and corrosive media.

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