Phase stability and microstructure morphology of microwave-sintered magnesia-partially stabilised zirconia

In this work, microwave heating approach was introduced into the preparation process of zirconia materials to overcome the tricky technical defects during the traditional electric arc furnace method. Magnesia-partially stabilised zirconia (MgO-PSZ) with enhanced stability and a uniform microstructure was prepared via microwave heating of a ZrO2 sample manufactured by the electric arc furnace method. The effects of microwave heating on the phase stability properties, microstructure, and surface morphology of the prepared MgO-PSZ sample were evaluated via X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, and Scanning electron microscopy, and the obtained results suggested that the stability rate of the MgO-PSZ sample improved from the initial value of 81.19%-94.82% after microwave heating at 1300 degrees C for 1 h. As a result of the martensitic conversion of ZrO2 material, the m-ZrO2 diffraction peaks were suppressed at the same time. Additionally, a similar changing trend was noticed in the XRD pattern, Raman spectrum, and FT-IR spectrum, indicating a decrease in the m-ZrO2 phase content in the microwave treated products. Furthermore, the microstructure on the surface of the microwave-sintered MgO-PSZ sample was improved in contrast to the raw MgO-PSZ sample, and became relatively more uniform and smooth. This study determined the optimal microwave heating conditions for the preparation of MgO-PSZ material with enhanced performance, and can provided as a good foundation for developing the further related research on zirconia materials preparing by microwave heating technology.

Automated summary

This study introduced microwave heating into the preparation process of zirconia materials to improve stability and microstructure of MgO-partially stabilised zirconia (MgO-PSZ). The effects of microwave heating on phase stability, microstructure, and surface morphology were evaluated, showing that microwave treatment significantly increased the stability rate of MgO-PSZ sample. Additionally, a decrease in m-ZrO2 phase content and improvement in microstructure were observed in the microwave-sintered MgO-PSZ sample. This research provided optimal microwave heating conditions for enhanced performance of MgO-PSZ material and laid a foundation for further research on zirconia materials prepared using microwave heating technology.