Boron-containing ceramics through the chemical conversian of borane-containing polymers
US4832895A · kind A · utility
16Cited by
16References
24Claims
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Key dates
| Filing date | Aug 7, 1987 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Aug 7, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/486
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for producing boron-containing ceramics such as boron carbide and boron nitride comprises pyrolyzing a blend of a precarbonaceous polymer such as polyacrylonitrile and a boron-containing polymer such as that formed by the reaction of a borane with a Lewis base. Pyrolyzation in an inert atmosphere yields boron carbide while pyrolyzation in a reactive gas burns away the precarbonaceous polymer and yiels a ceramic comprising the reaction product of boron and the pyrolyzation gas. Boron nitride ceramics are formed by pyrolyzing the preceramic blend in ammonia.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.