Novel synthesis and thermal property analysis of MgO–Nd2Zr2O7 composite

Abstract

MgO-Nd2Zr2O7composites with ratios of 50–70vol% MgO were produced via a one-pot combustion synthesis. A suite of characterization techniques, including X-ray diffraction, scanning and transmission electron microscopy were employed to investigate the structural properties while dilatometry, simultaneous thermal analysis and laser flash analysis were used to characterize the thermal properties of the composites. Dense pellets were produced after sintering at 1400°C with grain sizes between 200 and 500nm for both phases. The thermal properties of the composites are similar to those produced using standard methods. The composite with 70vol% MgO was found to have the highest thermal conductivity below 1000°C, while above this temperature the thermal conductivity was found to be similar and independent of MgO content. This novel synthesis route produces materials which show significant improvements in homogeneity with smaller particle sizes when compared to current standard synthesis techniques without significantly reducing thermal conductivity.