Title:
GRADED COMPOSITE HARDMETALS
Document Type and Number:
WIPO Patent Application WO2002011931
Kind Code:
A3
Abstract:
A multiple-region hardmetal tool piece (10). The tool piece includes a hardmetal body (12) including a hard particle component and a binder; an additional body, the additional body including a hardmetal body (14) having a hard particle component and a binder; a metal body or a ceramic body; a substantially discontinuous gradient-free boundary layer between the hardmetal body and the additional body; and a mating surface (16) between the hardmetal body and the additional body. In the preferred embodiment, the hard particle components are a carbide, such as tungsten carbide. In the preferred embodiment, the mating surface (16) includes a male portion (20) on one of the bodies and a corresponding female portion (22) on the other of the bodies. The mating surface (16) is symmetrical or asymmetrical and, in the preferred embodiment, the mating surface is axially symmetrical, such as a dimple. The mating surface may further include both micro and macro mating features.
Inventors:
MAJAGI SHIVANAND
BRITZKE ROBERT W
NELSON DANIEL W
BRITZKE ROBERT W
NELSON DANIEL W
Application Number:
PCT/US2001/020204
Publication Date:
October 17, 2002
Filing Date:
June 25, 2001
Export Citation:
Assignee:
KENNAMETAL INC (US)
International Classes:
B22F7/06; B22F7/00; (IPC1-7): B22F7/06
Domestic Patent References:
| WO1999003624A1 | 1999-01-28 |
Foreign References:
| US5333520A | 1994-08-02 | |||
| DE19634314A1 | 1998-01-29 | |||
| FR1522955A | 1968-04-26 | |||
| US4797326A | 1989-01-10 | |||
| US5809848A | 1998-09-22 |
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