NOUVEAUX MATERIAUX FORMES DE GRAINS REFRACTAIRES LIES PAR UNE MATRICE DE NITRURE D'ALUMINIUM OU DE SIALON CONTENANT DU NITRURE DE TITANE ET DES PARTICULES DE GRAPHITE ET/OU DE NITRURE DE BORE DISPERSEES

摘要

Refractory materials including (A) 32-87 wt % of particles and/or grains of at least one refractory material having melting and thermal dissociation points higher than 1700 DEG C; (B) 7-50 wt % of a binding matrix formed in situ and consisting of a sialon, AlN or a polytype thereof, or a mixture thereof; (C) 2-20 wt % of a titanium nitride TiN material dispersed in the matrix; and optionally (D) 0-42 wt % of hexagonal boron nitride, amorphous carbon and/or crystallised graphite dispersed within the binding matrix. The materials are particularly useful in metallurgy.