Surface coated cutting tool
US9797040B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2014 |
| Grant date | Oct 24, 2017 |
| Priority date | — |
| Expiry date | May 14, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23B2228/105
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A hard coating layer on a cutting tool includes at least a Ti and Al complex nitride or carbonitride layer and has an average layer thickness of 1 to 20 μm. In a case where a composition of the complex nitride or carbonitride layer is expressed by: (Ti1-xAlx)(CyN1-y), a content ratio x and a content ratio y satisfy 0.60≦x≦0.95 and 0≦y≦0.005, where x and y are in atomic ratio. Crystal grains constituting the complex nitride or carbonitride layer include cubic phase crystal grains and hexagonal phase crystal grains. An area ratio occupied by the cubic phase crystal grains is 30-80%. An average grain width W is 0.05-1.0 μm. An average aspect ratio A of the crystal grains with the cubic grain structure is 5 or less. A periodic content ratio change of Ti and Al in (Ti1-xAlx)(CyN1-y) exists in each of the cubic phase crystal grains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.