Methods for preparing cubic boron nitride sintered body and cubic boron nitride, and method for preparing boron nitride for use in the same
US4545968A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1984 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Nov 2, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2002/82
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There are disclosed methods for preparing cubic boron nitride sintered body. One method involves pyrolyzing borazine and/or a borazine derivative to obtain a boron nitride; mixing said boron nitride and a catalyst composed of a metal and/or metallic compound; and reacting the mixture at a pressure of 3 GPa or more and at a temperature of 700.degree. C. or more. Another method comprises the step of pyrolyzing borazine and/or a borazine derivative to obtain a boron nitride; mixing said boron nitride and a catalyst composed of a metal and/or metallic compound; reacting the mixture at a pressure of 3 GPa or more and at a temperature of 700.degree. C. or more; and removing the catalyst from a formed product. The conversion rate into cubic boron nitride achieved with these methods is as high as 100%, and the obtained cubic boron nitride is highly pure and fine. Also disclosed is a method for preparing boron nitride by pyrolyzing at least one compound selected from the group consisting of borazine and/or a borazine derivative at a temperature of 150.degree. to 700.degree. C. and a pressure of 10 MPa or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.