SURFACE-COATED BORON NITRIDE SINTERED BODY TOOL
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United States of America Patent
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Issued Date -
Feb 18, 2016
app pub date -
Feb 26, 2014
filing date -
Mar 29, 2013
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Abstract
In a surface-coated boron nitride sintered body tool, at least a cutting edge portion includes a cubic boron nitride sintered body and a coating layer formed on a surface of the cubic boron nitride sintered body. A layer B of the coating layer is formed by alternately laminating one or more layers of each of two or more thin-film layers having different compositions. A B1 thin-film layer as one of the thin-film layers has a thickness more than 30 nm and less than 200 nm. A B2 thin-film layer as one of the thin-film layers different from the B1 thin-film layer is formed by alternately laminating one or more layers of each of two or more compound layers having different compositions. Each of the compound layers has a thickness not less than 0.5 nm and less than 30 nm.
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