Surface coated cutting tool made of cermet having property-modified α type Al2O3 layer of hard coating layer
US7763346B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2006 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | Oct 31, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A surface coated cermet cutting tool comprising a tool body and a hard coating layer formed on the surface of the tool body, wherein the hard coating layer has a lower layer of a titanium compound layer and an upper layer of property-modified α type Al2O3 layer that has a crystal grain boundary orientation determined using a field emission type scanning electron microscope and an electron back-scattered diffraction pattern imaging device such that crystal grain boundary units of not less than 45% of all the grain boundaries show intersection angles of 15° or less between normals of (0001) planes and between normals of {10-10} planes, where a crystal grain boundary unit is a crystal grain boundary of adjacent pair of crystal grains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.