Abstract
This chapter investigates the micro structural evolution during sintering of a Cu-TiB2 composite having a high volume content of titanium diboride nanoparticle. The nanocomposite powders are produced by a synthetic method combining the mechanical treatment in a high-energy ball mill and a self-propagating exothermic reaction. The fine-grained skeleton of titanium diboride is formed with connectivity between particles well established during spark plasma sintering of Cu-TiB2 nanocomposite. This interpenetrating phase composite of the Cu-TiB2 system is produced under simultaneous action of pressure, temperature, and electrical current. Titanium diboride nanoparticle is distributed in copper matrix agglomerate and form a fine-grained skeleton. The chapter focuses on the peculiarities of the microstructural evolution during SPS of titanium diboride-copper nanocomposites with a high volume content of TiB2 nanoparticles. The nanocomposites are obtained by a self-propagating high-temperature reaction combined with preliminary and subsequent mechanical treatments of the powders and exhibited distinctive microstructures. The chapter also explores that microstructural changes proceed through different paths depending upon the process by which sintering is stimulated. Actions of electrical discharge, pressure, and temperature on the composite during spark plasma sintering results in a high degree of densification and the formation of titanium diboride skeletons interpenetrating the copper matrix.
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