Drill bit having a diamond-coated sintered body

作者: Hideki Moriguchi , Naoya Omori , Toshio Nomura

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摘要: A drill bit of a diamond-coated sintered body has substrate mainly composed Si 3 N 4 or SiC. At least wear portion the is coated with diamond layer. If throw-away kind, an insert removably secured to shank. thereof The contains prescribed amount sintering assistant aid selected from MgO, Y 2 O and like. coating layer thickness at 0.1 μm.

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