Aluminum nitride from inorganic polymers
US5455322A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1994 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Jul 13, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G79/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention provides a process for manufacturing aluminum-nitrogen polymers (i.e., polymers having a backbone of alternating aluminum and nitrogen atoms) in which portions of the polymer have an organic substituent on each aluminum and nitrogen atom. The novel polymers so produced are useful for making green shapes pyrolyzable to AlN articles suitable for high performance applications. The process generally comprises reacting an organic nitrile having the formula R.sup.1 CN with a trialkylaluminum compound having the formula R.sup.2 R.sup.3 R.sup.4 Al, and optionally heating the reaction product, to form an organoaluminum imine, and heating the organoaluminum imine to a temperature of at least 300.degree. C. and less than 600.degree. C. for at least two hours to form an aluminum-nitrogen polymer. The polymer or the imine can be pyrolyzed to form an aluminum nitride ceramic article. In the foregoing formulae, R.sup.1 is an alkyl, cycloalkyl, aryl, aralkyl, hetero(ar)alkyl, or heterocyclic-substituted alkyl group, and R.sup.2, R.sup.3, and R.sup.4 are each independently an alkyl, aryl, or aralkyl group, wherein any alkyl moiety comprises 1-12 carbon atoms, and wherein heteroatoms …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.