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Using spark plasma sintering method, at temperature  T  = 1400°C and load of 30 MPa samples of composite material Ti 3 SiC 2 /TiC were obtained. Before SPS powder mixtures with molar ratio 3Ti-1.25SiC-0.75C with addition of up to 4% wt of nanopowders of titanium carbide or silicon carbide were mechanically activated in a planetary mill. Material structure was studied using X-ray structural analysis, hardness and fracture toughness was evaluated on basis of Vicker’s indentation results. It was established that introduction of nanocarbides up to 1% wt significantly reduces contents of Ti 3 SiC 2 , and further on practically has no influence on phase composition. Increase of isothermal time from 5 to 15 min leads to an increase in the Ti x Si y  secondary phases to 11–14%. Introduction of nano-TiC and nano-SiC into mixtures increases crack fracture toughness to 7.06–7.55 MPa·m 1/2  for samples after 5 min of SPS and practically does not change it after 15 min of SPS.

Effect of nanosized titanium and silicon carbides on synthesis and consolidation of titanium silicon carbide during spark plasma sintering