Patent ID: 6156383
Filing Date: 2000-12-05
Classification: C23C,Y10T

Abstract:
A method of producing an alumina coated tool, which comprises:forming at least one non-oxide layer of at least one of carbide, nitride and carbonitride of a metal selected from the group consisting of the Groups IVa, Va and VIa of the Periodic Table on a surface of a substrate body;forming on said non-oxide layer a face-centered-cubic bonding layer comprising a single-coating or a multi-coating of at least one of oxide, oxycarbide, oxynitride, oxycarbonitride of a metal selected from the group consisting of the Groups IVa, Va and VIa of the Periodic Table at 950 to 1020.degree. C. by bringing a gas mixture into contact with said non-oxide layer, said gas mixture comprising a gas mixture used for forming said non-oxide layer and CO.sub.2 gas added thereto in an amount of 0.5 to 1.5 volume % based on said gas mixture for forming said non-oxide layer; andforming on said bonding layer an oxide layer which is substantially .alpha.-Al.sub.2 O.sub.3.