Self-propagating high-temperature synthesis of TiC-TiB₂/Cu ceramic-matrix composite

TiC-TiB₂/Cu ceramic-matrix composites were produced by the self-propagating high-temperature combustion synthesis combined with pseudo hot isostatic pressing. The microstructure and mechanical properties of the synthesized compacts were investigated. The results show that the final product consists of TiC, TiB₂ and Cu three phases, which is pure without unreacted B₄C and Ti. The particle sizes of TiB₂ and TiC decrease with Cu content increasing due to the reduction of the combustion temperature. The introduction of Cu into the composites results in a drastic increase of the relative density, transverse rupture strength and fracture toughness. The maximum bend strength obtained with the addition of 20 wt% Cu is 580 MPa, while the maximum fracture toughness obtained with the addition of 40 wt% Cu is 8.l Mpa·m^1/2.