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US 5,508,239 AGranted
High strength aluminum nitride fibers and composites and processes for the preparation thereof
AssigneeE. I. Du Pont de Nemours and Company
InventorsJohn D. Bolt, Frederick N. Tebbe
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Abstract
Shaped articles of polycrystalline aluminum nitride are disclosed having a tensile strength of at least about 100 Kpsi. The shaped articles are preferably fibers. Composites of polycrystalline AlN fibers in a matrix of organic or inorganic polymer, metal, glass or ceramic are also disclosed herein. The process for the preparation of polycrystalline aluminum nitride fibers is covered.
Claims6
A process for the preparation of polycrystalline aluminum nitride fibers having superior tensile strength, comprising:
- (a) introducing dialkylaluminum amide into a suitable reaction vessel;
- (b) doping the dialkylaluminum amide with oxygen in an amount sufficient to provide at least about 1.5 weight percent oxygen in the polycrystalline aluminum nitride fibers;
- (c) polymerizing the dialkylaluminum amide doped with oxygen to an organoaluminum precursor;
- (d) melt spinning the precursor into fibers;
- (e) curing the fibers of step (d);
- (f) heating the fibers of step (e) at a temperature sufficient to pyrolyze the fibers of step (e);
- and
- (g) sintering said pyrolyzed fibers to form polycrystalline aluminum nitride fibers.
5 more elements
Dependencies are inferred from the claim text.