Surface coated tungsten carbide-base sintered hard alloy material for inserts of cutting tools
US4812370A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Sep 25, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12146
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A surface coated tungsten carbide-base sintered hard alloy material for inserts of cutting tools having excellent wear resistance and toughness comprising PA0 (1) a substrate having an internal portion consisting essentially of 5-30 percent by weight of one composite metal carbo-nitride, as a compound forming a hard dispersion phase, selected from the group consisting of (Ti, W)CN, (Ti, Nb, W)CN, (Ti, Ta, W)CN, and (Ti, Nb, Ta, W)CN; 4-10 percent Co as a component forming a binder phase, and the balance of WC as a component forming the hard disperse phase and inevitable impurities; the substrate having a surface portion formed with a Co-enriched layer being substantially free of the composite metal carbo-nitride; and PA0 (2) a hard surface layer coated over the surface of the substrate, comprising an innermost layer consisting essentially of TiC, the innermost layer containing one of a W component and W and Co components diffused from the substrate; a diffusion preventing layer formed by one of a single layer of one compound selected from the group consisting of TiCN and TiN, or a double layer of both of the components TiCN and TiN; an inner layer consisting essentially of TiC, the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.