Coated hard alloy blade member
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United States of America Patent
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Jul 6, 1999
Grant Date -
N/A
app pub date -
Mar 6, 1995
filing date -
May 31, 1994
priority date (Note) -
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Abstract
A coated hard alloy blade member is disclosed which includes a substrate formed of a hard alloy of a WC-based cemented carbide or a TiCN-based cermet, and a hard coating deposited on the substrate. The hard coating includes an inner layer of TiCN having unilaterally grown crystals of an elongated shape and an outer layer of Al.sub.2 O.sub.3 having a crystal form .kappa. or .kappa.+.alpha. wherein .kappa.>.alpha.. The resulting blade member is highly resistant to wear and fracturing, and possesses cutting ability of a higher level.
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