Coated cemented carbide endmill having hard-material-coated-layers excellent in adhesion
US6207262A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1998 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Sep 2, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A coated cemented carbide endmill comprises a tungsten carbide based cemented carbide substrate comprising 5-20% Co as a binder phase forming component, optionally 0.1-2% of Cr and/or V as a binder phase forming component, optionally 0.1-5% of one or more of (Ti, Ta, Nb, Zr) C.multidot.N as a dispersed phase forming component, and the balance being WC as the dispersed phase forming component and inevitable impurities. The WC has a fine grained structure having an average grain size of 0.1-1.5 .mu.m, the cemented carbide substrate has a reaction-created surface layer formed on the surface portion thereof which is formed by heating at high temperature and in which Co.sub.m W.sub.n C is distributed over a thickness of 0.1-2 .mu.m thereof, and further the substrate has coated layers composed of a Ti compound layer. Optionally, an Al.sub.2 O.sub.3 layer is formed thereon with an average layer thickness of 0.5-4.5 .mu.m, the Ti compound layer being composed of one or more layers of TiC, TiN, TiCN, TiCO, TiNO and TiCNO using MT-CVD and the Al.sub.2 O.sub.3 layer is formed using MT-CVD or HT-CVD. The hard-material-coated layers of the endmill have excellent adhesion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.