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Metal coating method

  • US 5,032,421 A
  • Filed: 08/21/1990
  • Issued: 07/16/1991
  • Est. Priority Date: 08/21/1990
  • Status: Expired due to Term
First Claim
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1. A method of coating metallic articles utilizing an essentially dry process which comprises the steps of:

  • a. cleaning a selected area of an article by abrasion to remove macro particles, scales and the like,b. exposing said area to a plasma of above a 1-2 Key energy level in the presence of an argon environment,c. preheating said area to a temperature above 230 degrees Celsius,d. producing an evaporant of a metal to be coated upon said area by evaporation through bombardment by an electron beam directed against the said metal in a vacuum on the order of greater than 10-4 Torr,e. transporting said article in said area within said evaporant at a distance on the order of between 1 and 7 inches whereby said evaporant condenses on the said area to coat said area,f. adjusting the rate of transport to effect the thickness of said coating as desired.

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