C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
204/96.04, 204/1
C23C 4/00 (2006.01) C23C 14/32 (2006.01) H01J 37/32 (2006.01)
Patent
CA 1306972
Abstract An improved method and apparatus for maintaining cathode spots in an electric arc vapor deposition coating process, on the desired cathode evaporation surface are disclosed. A primary anode is arranged, configured and biased within a vacuum deposition coating chamber relative to a cathodic source so as to maintain an electric arc therebetween. A relative biasing network maintains a voltage difference during deposition between the primary anode and other conduc- tive surfaces within the chamber, or the chamber wall itself, such that electrons leaving the cathode are preferentially drawn toward the primary anode rather than to other conductive surfaces. The anode orienta- tion within the chamber causes those electrons drawn toward it to tend to maintain the cathode spots on the desired cathode evaporation surface for maintaining arc stability at low arc current levels.
512044
Andal Corp.
Bergman Clark
Cassan Maclean
Multi-Arc Vacuum Systems Inc.
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