Multilayer coated cemented carbide cutting insert
US4984940A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1990 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Jan 8, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T407/27
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An indexable metalcutting insert is provided having a cobalt cemented tungsten carbide substrate wit a multilayer refractory coating thereon. The substrate has a cobalt content of 6.1 to 6.5 weight percent and is characterized by a hardness of 90.8 to 91.6 Rockwell A and a magnetic coercive force of 110 to 180 oerstads. The coating contains at least a plurality of alumina layers which are separated from and bonded to each other by a group IVB metal nitride, such as titanium nitride, and which are bonded to the substrate by a backing layer of 5 to 8 .mu. in thickness, composed of a carbide and/or carbonitride of titanium, zirconium and/or hafnium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.