Thermophysical properties of a Cu–Ti–C–B SHS composite

The paper studies the thermophysical properties of a Cu-Ti-C-B composite produced by self-propagating high-temperature synthesis (SHS) an initial mixture copper, titanium, boron carbide (B4C), and carbon powders. matrix is supersaturated solid solution titanium in copper lattice with Cu4Ti nanosized particles homogeneously precipitated under cooling. microhardness 450 HV 0.1. Particles (TiC) diboride (TiB2) resulting from SHS are randomly distributed bulk composite. regions predominance TiC 640 0.1, TiB2 900 average hardness 60 HRC. Differential scanning calorimetry demonstrates unified wide exothermic effect at temperatures ranging 750 to 1000 °С, enthalpy 148.6 J/g, associated reaction between residual which did not react during SHS. temperature dependences density, thermal diffusivity, heat capacity, conductivity, coefficient linear expansion experimentally determined. strengthening phases found reduce slightly compared pure copper. It shown that annealing 800 860°C decreases level stresses matrix.