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The study investigates the density, phase composition, microstructure andmechanical properties (microhardness, fracture toughness) of binderless WC +SiC and WC + SiC + C ceramics obtained by Spark Plasma Sintering (SPS).Nanopowders of a-WC produced by DC arc plasma chemical synthesis were used asraw materials. Powder compositions for sintering contained graphite (0.3, 0.5%wt.) or b-SiC (1, 3, 5% wt.) with 0.3% wt. graphite. It was shown that WC + 1%wt. SiC + 0.3% wt.C ceramics have a homogeneous fine-grained microstructure,high relative density, increased microhardness and Palmquist fracture toughness(Indentation Fracture Resistance). The kinetics of the initial sintering stageof WC + C and WC + C + SiC powder compositions was also analyzed usinghigh-temperature dilatometry at the conventional pressureless sintering (CPS)conditions. The CPS and SPS activation energies of WC + SiC powder at theintensive shrinkage stage were determined using the Young-Cutler model. The CPSactivation energies of WC, WC + C and WC + C + SiC powder compositions areclose to the activation energy of diffusion of the carbon C along the a-WCgrain boundaries. The SPS activation energies of WC + C and WC+ C + SiC powdercompositions turn out to be lower than the activation energy of the C of a-WCgrain boundary.

Combined effect of SiC and carbon on sintering kinetics, microstructure and mechanical properties of fine-grained binderless tungsten carbide