Ultrahard nanotwinned boron nitride bulk materials and synthetic method thereof
US9422161B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2013 |
| Grant date | Aug 23, 2016 |
| Priority date | — |
| Expiry date | Aug 2, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/96
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to an ultrahard nanotwinned boron nitride bulk material and synthetic method thereof. Particularly, the invention discloses a nanocrystalline cubic boron nitride bulk material containing high density of twins and synthetic method thereof, in which a nanotwinned boron nitride bulk are synthesized from nanospherical boron nitride particles (preferably with a size of 5-70 nm) with onion-like structure as raw materials by using high temperature and high pressure synthesis. As compared with the prior arts, the nanotwinned boron nitride bulk obtained according to the invention has a much higher hardness than that of a normal cubic boron nitride single crystal. The nanotwinned boron nitride bulk has great prospects in applications, such as precision and ultra-precision machining, abrasives, drawing dies, and special optics as well as other fields.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.