Surface-coated cermet cutting tool with hard coating layer exhibiting excellent chipping resistance in high-speed intermittent cutting
US7442433B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2006 |
| Grant date | Oct 28, 2008 |
| Priority date | — |
| Expiry date | Nov 2, 2026 |
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 is formed by depositing on a surface of a tool substrate a hard-coating layer composed of the following layers (a) and (b):(a) the lower layer is composed of one or more layers of TiC, TiN, TiCN, TiCO, and TiCNO and has a total average layer thickness in the range of 3 to 20 μm, and (b) the upper layer is an aluminum oxide layer having an α-type crystal structure when chemically deposited and has an average layer thickness in the range of 1 to 15 μm. In the case of the upper layer, the reformed α-Al2O3 layer shows distribution graphs of covalent lattice points of constituent atoms, which shows distribution ratios of individual ΣN+1 to total ΣN+1, having the highest peak at Σ3 and showing the distribution ratios of Σ3 to total ΣN+1 in the range of 60 to 80%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.