Fractography of Dense Metal-Like Carbides Sintered with Carbon
Metals belonging to groups 4-6 of periodic table of elements form with carbon compounds named metal-like carbides (WC, TiC1-x, NbC, TaC, CryCz). It was established that is possible to achieve dense sintered bodies of this carbides at temperatures near 2000oC using only carbon powder as an additive. Its role consists in reduction of oxide impurities. Presented paper summarized investigations on sintering of metal-like carbides with carbon. Dense WC, TiC1-x, NbC, TaC and CryCz bodies were characterized by KIc factor value. A special care was taken on microstructure and the way of fracture description in relation to the critical stress intensity factor (KIc). It was established that the way of fracture and the finally fracture toughness depend on type of microstructure and degree of nonstoichiometry.
J. Dusza, R. Danzer, R. Morrell and G.D. Quinn
A. Gubernat and L. Stobierski, "Fractography of Dense Metal-Like Carbides Sintered with Carbon", Key Engineering Materials, Vol. 409, pp. 287-290, 2009