Anchored oxide coatings on hard metal cutting tools
AssigneeTeledyne Industries, Inc.
InventorsRoy V. Leverenz, John Bost
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Abstract
A cutting tool insert comprises a hard metal substrate having at least two wear-resistant coatings including an exterior ceramic coating and a coating under the ceramic coating being a metal carbonitride having a nitrogen to carbon atomic ratio between 0.7 and 0.95 which causes the metal carbonitride to form projections into the ceramic coating improving adherence and fatigue strength of the ceramic coating.
Claims10
A cutting tool insert comprising a hard metal substrate having at least two wear-resistant coatings including an exterior ceramic coating and a coating under the ceramic coating being a metal carbonitride having a nitrogen to carbon atomic ratio between 0.7 and 0.95 which causes the metal carbonitride to form projections into the ceramic coating whereby improving adherence and fatigue strength of the ceramic coating.
A method of making a cutting tool insert comprising the steps of applying a titanium nitride coating, a metal carbonitride coating and a ceramic coating, all by chemical vapor deposition, wherein the reactants during the chemical vapor deposition of the carbonitride layer are controlled to provide a nitrogen to carbon atomic ratio between 0.75 and 0.95 and wherein a ceramic coating is deposited thereover such that the carbonitride layer has fingers which extend into the ceramic coating increasing coating adhesion.
Dependencies are inferred from the claim text.