Workpiece for use with cutting worktool, is made from silicon nitride substrate, and coating of diamond is provided at surface regions, where surface regions beneath diamond layer has gap density

摘要

The workpiece is made from a silicon nitride substrate and a coating of diamond is provided at the surface regions. The surface region beneath the diamond layer has a gap density with a depth of 10 micrometer of the substrate, on which less than three gaps with length of more than 5 micrometer are provided on a length of 100 micrometer along an arbitrary aligned axis. An intermediate layer from silicon carbide is formed on the substrate surface between substrate and diamond coating. An independent claim is also included for a method of production of workpiece.