STRUCTURAL PECULIARITIES OF CERMETS DESIGN BASED ON TITANIUM CARBIDE .1. INFLUENCE OF CHEMICAL-COMPOSITION ON THE DUCTILE-BRITTLE TRANSITION-TEMPERATURE, MICROSTRUCTURE AND PROPERTIES OF CERMETS

The influence of chemical composition on the ductile-brittle transitio n (DBT) temperature, microstructure and mechanical properties of cerme ts based on titanium carbide (chemical composition of cermets TICx, (x = 0.55; 0.65; 0.75 and 1.0) - nickel-based superalloy (Russian Trade Mark GS6U containing (wt%) Ni-10W-10Co-9Cr-5.5Al-2.5Ti-2Mo-0.15C) was studied. It was shown that high strength in cermets can be achieved if the structure of the frames is retained and the DBT temperature of th e refractory phase is controlled. By changing the microstructure and i ts homogeneity, the chemical composition of the frames, the porosity v alue and the binding material, it is possible to synthesize new cermet s for certain temperature regions. The optimum operating temperature o f such materials depends on the DBT temperature and the temperature of the transition to a superplastic state of refractory phases.