Multi-oxide coated carbide body and method of producing the same
US5137774A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1990 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Jul 13, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Improved properties of aluminum oxide wear layers on cemented carbides and related substrates can be obtained by combining the two alumina polymorphs (.alpha.-Al.sub.2 O.sub.3 and kappa-Al.sub.2 O.sub.3) as multilayers. The nucleation of .alpha.-Al.sub.2 O.sub.3 and particularly kappa-Al.sub.2 O.sub.3 can be controlled by means of modification layers. According to this invention, it is thus possible to CVD-deposit an oxide multicoating layer consisting of clearly specified layers of .alpha.-Al.sub.2 O.sub.3 and kappa-Al.sub.2 O.sub.3. Preferably, .alpha.-Al.sub.2 O.sub.3 is deposited first by CVD on a TiC coated cemented carbide substrate followed by the said coating layer of kappa-Al.sub.2 O.sub.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.