Coated cemented carbide cutting tool member and process for producing the same
US6338894B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2000 |
| Grant date | Jan 15, 2002 |
| Priority date | — |
| Expiry date | May 31, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to a coated cemented carbide cutting tool member, which includes:a substrate and a hard coating layer deposited on the substrate, wherein the hard coating layer has an average thickness of 3 to 25 &mgr;m and includes:(1) at least one layer having an average thickness of 0.1 to 5 &mgr;m and including a granular Ti compound selected from the group including TiC, TiN, TiCN, Ti2O3, TiCO, TiNO, TiCNO and mixtures thereof;(2) a TiCN layer having an average thickness is 2 to 15 &mgr;m and including a longitudinal growth crystal structure; and(3) an Al2O2 layer having an average thickness of 0.5 to 8 &mgr;m;wherein the TiCN layer includes a growth direction and a compositional gradient of carbon and nitrogen along the growth direction. The invention also relates to a process for producing a coated carbide member, which includes depositing a TiCN layer with a reactive gas, the layer having a lower portion and an upper portion; and, during the depositing, changing a concentration in the reactive gas of at least one selected from the group including CH3CN, CH4, N2, and mixtures thereof; wherein the depositing of the lower portion is carried out at a deposition te…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.