Method of improving the toughness of SiC-based ceramics. SiC, , AlN, Al.sub.2 O.sub.3 and optionally .alpha.-Si.sub.3 N.sub.4 are hot pressed to form a material which includes AlN polytypoids within its structure.
GOVERNMENT SUPPORT STATEMENT
This invention was made with Government support under contract number DE-ACO5-840R21400 awarded by the Department of Energy. The Government has certain rights in the invention.