Method of coating a body with an .alpha.-alumina coating

  • US 5,654,035 A
  • Filed: 09/22/1995
  • Issued: 08/05/1997
  • Est. Priority Date: 12/18/1992
  • Status: Expired due to Term
First Claim
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1. A method of coating a cutting tool body with an α

  • -alumina coating consisting essentially of heating the cutting tool body while bringing the cutting tool body in contact with a hydrogen carrier gas to which has been added CO2, followed by CO, and than AlCl3 so as to deposit an alpha-alumina layer on the cutting tool body, wherein the oxidation potential of the hydrogen carrier gas is controlled by maintaining a content of H2 O in the carrier gas below 20 ppm of H2 O prior to nucleation of said alpha-Al2 O3.

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