Abstract
This work presents the synthesis of ultra fine grained high-strength Cu–Nb–ZrO2 bulk samples via mechanical alloying and spark plasma sintering. Technologically relevant properties such as density, micro-hardness, and electrical conductivity were studied in terms of the compaction parameters, in particular the sintering temperature and holding time.An optimum process parameter combination has been found T=950°C, t=1min, and 65MPa, which yield a micro-hardness of 325HV, 97.5% relative density, and electrical conductivity of 10% IACS. The dependence of these properties on the compaction parameters is explained by analyzing the microstructure, i.e. grain size, presence and distribution of phases, and porosity, with X-ray diffraction, optical and electron microscopy as well as with an Archimedes densitometer.
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