Cubic boron nitride sintered material tool
US12409502B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2021 |
| Grant date | Sep 9, 2025 |
| Priority date | — |
| Expiry date | Jan 10, 2043 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/963
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A cubic boron nitride sintered material tool contains a plurality of cBN grains. cBN grains located on a surface of the cutting edge contain a cubic boron nitride phase, and a hexagonal boron nitride phase. When a ratio Iπ*/Iσ* between an intensity of a π* peak derived from a π bond of hBN in the hexagonal boron nitride phase and an intensity of a σ* peak derived from a σ bond of hBN in the hexagonal boron nitride phase and a σ bond of cBN in the cubic boron nitride phase is determined by measuring an energy loss associated with excitation of K-shell electrons of boron, the ratio Iπ*/Iσ* of the cBN grain on the surface of the cutting edge is 0.1 to 2, and the ratio Iπ*/Iσ* of the cBN grain at a depth position of 5 μm from the surface of the cutting edge is 0.001 to 0.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.