COATED CUTTING TOOL
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United States of America Patent
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Issued Date -
Jul 21, 2016
app pub date -
Aug 21, 2014
filing date -
Aug 21, 2013
priority date (Note) -
Published
status (Latency Note)
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Abstract
A coated cutting tool includes: a substrate; and a coating layer formed on a surface of the substrate, wherein the coating layer includes at least one layer of a Ti compound layer, the Ti compound layer is a compound containing a Ti element and at least one of element selected from the group consisting of C, N, O, and B, the Ti compound layer has a region surrounded by cracks when a polished surface approximately parallel to the surface of the substrate in the Ti compound layer is viewed from an upper surface, inside the region has an intermittent crack, one end or both ends of the crack not making contact with the cracks constituting the region, and relationship between an average number density A of the region and an average number density B of the intermittent crack satisfies 0.7
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