Properties of Cu-based nanocomposites produced by mechanically-activated self-propagating high-temperature synthesis and spark-plasma sintering.
One of the possible reasons for low conductivity of in-situ produced dispersion strengthened copper matrix composites may be the incompleteness of the reaction between the initial reactants that remain in a state of solid solutions in the copper matrix. We report in-situ synthesis of TiB2-Cu composites starting from the powder mixtures with the limited content of copper ensuring a high probability of contact between the particles of titanium and boron and, as a result, their full conversion into the TiB2 phase. The nanoparticles were formed in a self-propagating mode in the ball milled Ti-B-Cu powder mixture corresponding to 57 vol.% TiB2-Cu composition. Afterwards, the system was "diluted" with the required amount of the copper matrix using subsequent ball milling. Highly conductive 4.5 vol.% TiB2-Cu composites showing 82-87% IACS (International Annealed Copper Standard) conductivity were obtained by Spark Plasma Sintering (SPS) of the powders.
Kim
Ji Soon
JS
School of Materials Science and Engineering, University of Ulsan, Ulsan 680-749, Korea.
Dudina
Dina V
DV
Kim
Jin Chun
JC
Kwon
Young Soon
YS
Park
Jin Ju
JJ
Rhee
Chang Kyu
CK