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Investigation on microstructure and thermal properties of in-situ synthesized Cu–ZrO2 nanocomposites

Abstract Cu–ZrO2 nanocomposites were prepared by an in-situ reactive synthesis of copper nitrate Cu(NO3)2 and zirconium oxychloride ZrOCl2. Zirconia (ZrO2) was added by 2.5, 5 and 10 wt.% to the Cu matrix to assess its effect on thermal conductivity and thermal expansion behavior. The results showed that ZrO2 nanoparticles (30–50 nm) were homogeneously distributed in the copper matrix. The measured thermal conductivity for the Cu–ZrO2 nanocomposites decreased from 372.8 to 94.4 W m−1 K−1 with increasing ZrO2 content from 0 to 10 wt.%. Cu-10 wt.% ZrO2 nanocomposite yields a low thermal conductivity of 94.4 W · m−1 K−1 along with a low coefficient of thermal expansion, 11.47 × 10−6 K−1.