Patent ID: 7455918
Filing Date: 2008-11-25
Classification: C23C

Abstract:
1. A coated body comprising: a substrate; a coating scheme on the substrate wherein the coating scheme includes an alpha-alumina coating layer that exhibits a platelet grain morphology at the surface of the alpha-alumina coating layer; and the coating scheme including a modification coating layer applied by chemical vapor deposition wherein the modification coating layer includes oxygen and aluminum and one or more of carbon and nitrogen and one or more of the Group IVB elements of the Periodic Table; the alpha-alumina coating layer being applied on the modification coating layer; and the coating scheme further including an intermediate coating layer containing a carbonitride of one or more of a Group IVB element of the Periodic Table applied by chemical vapor deposition, and the modification coating layer being applied on the intermediate coating layer; and the coating scheme further including a base coating layer on the substrate, and the intermediate coating layer being applied on the base coating layer.