B - Operations – Transporting – 05 – B
Patent
B - Operations, Transporting
05
B
32/60, 327/72
B05B 7/20 (2006.01) B05B 7/22 (2006.01) B05B 13/04 (2006.01) C23C 4/12 (2006.01)
Patent
CA 1154953
Abstract of the Disclosure Uniform protective coatings are deposited on components with a high strength bond by utilizing a supersonic plasma stream and a transferred arc sys- tem of selectively reversible polarity. By maintaining plasma stream velocity at a sufficiently high Mach number, and using stream temperatures and static pressures which establish a shock pattern characteristic that diffuses the arc, the workpiece is made cathodic relative to the plasma gun at predetermined in- tervals. This creates a sputtering effect in which electrons and atoms are ejected from the workpiece despite the impacting plasma flow and the ambient pressure level. This sputtering action is undertaken to clean the workpiece once it is sufficiently heated and to cause intermingling of molecules of the substrate material with molecules of a deposition powder injected into the plasma flow. This preparatory deposition, together with the clean workpiece surface, enables a subsequent buildup of securely bonded and highly uniform material.
363861
Kremith Roland D.
Muehlberger Erich
Electro-Plasma Inc.
Smart & Biggar
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