| US 7,510,761 B2 | ||
| Cutting tool made of surface-coated cemented carbide with hard coating layer exhibiting excellent wear resistance in high speed cutting operation of high hardness steel | ||
| Akihiro Kondo, Yuuki-gun (Japan); Yusuke Tanaka, Yuuki-gun (Japan); and Koichi Maeda, Akashi (Japan) | ||
| Assigned to Mitsubishi Materials Corporation, Tokyo (Japan) | ||
| Filed on Feb. 09, 2006, as Appl. No. 11/352,111. | ||
| Claims priority of application No. 2005-035684 (JP), filed on Feb. 14, 2005. | ||
| Prior Publication US 2006/0183000 A1, Aug. 17, 2006 | ||
| Int. Cl. B23B 27/14 (2006.01) | ||
| U.S. Cl. 428—216 [51/307; 51/309; 428/336; 428/446; 428/697; 428/698; 428/699] | 1 Claim |
| 1. A cutting tool made of surface-coated cemented carbide having a hard coating layer that exhibits excellent wear resistance
in high speed cuffing operation of high hardness steel, comprising:
a carbide substrate made of tungsten-carbide cemented carbide or titanium-carbonitride cermet and
the hard coating layer formed on the surface of the carbide substrate by vapor deposition, wherein
(a) the hard coating layer includes a top layer and a bottom layer both formed from composite nitride of Ti, Al and Si, the
top layer having the thickness in a range from 0.5 to 1.5 μm and the bottom layer having the thickness in a range from 2 to
6 μm;
(b) the top layer includes a structure having the thin layer A and the thin layer B stacked alternately each having the thickness
of 5 to 20 nm, with the thin layer A comprising composite nitride of Ti, Al and Si having the composition of [Ti1−(A+B)AlASiB]N (A is in a range from 0.01 to 0.06 and B is in a range from 0.25 to 0.35 in an atomic ratio) and the thin layer B comprising
composite nitride of Ti, Al and Si having the composition of [Ti1−(C+D)AlCSiD]N (C is in a range from 0.30 to 0.45 and D is in a range from 0.10 to 0.15 in an atomic ratio); and
(c) the bottom layer comprising composite nitride of Ti, Al and Si of single phase structure having the composition of [Ti1−(E+F)AlESiF]N (E is in a range from 0.50 to 0.60 and F is in a range from 0.01 to 0.09 in an atomic ratio).
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