Back to results
US 4,539,300 AGranted
Method for the fabrication of hexagonal BN toughened matrix composites
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorWilliam S. Coblenz
Life of this patent
Estimating the term…
Abstract
BN toughened bodies having isotropic properties are produced by reacting ub.2 O.sub.3, H.sub.3 BO.sub.3 or a mixture thereof with a metal nitride or a mixture of metal nitrides. The process described may be carried out using metal tooling.
Claims1
A process for producing a BN-toughened mullite, the steps of which comprise:
- wet-milling in a non-polar liquid a mixture consisting essentially of a first reactant chosen from group consisting of B.sub.2 O.sub.3, H.sub.3 BO.sub.3 and mixtures thereof and a second reactant consisting essentially of AlN and Si.sub.3 N.sub.4 ;
- densifying said reactants at about 1000.degree.-1200.degree. C.;
- reacting said reactants in a furnace at 1650.degree.-1700.degree. C. in a nitrogen atmosphere to produce a mullite body having hexagonal particles of BN dispersed evenly throughout.
Dependencies are inferred from the claim text.