Abstract
High entropy oxide powders (ZrTiCoNiNb)Ox were successfully synthesised using microwave heating with a TE666 resonant mode at temperatures ranging from 700 °C to 900 °C. X-ray diffraction (XRD) and Scanning electron microscopy (SEM) techniques were carried out to characterize the samples, and the behavior of the samples when they undergo microwave heating was investigated. The mechanism of thermal field modulation (TFM) was explored to reduce the temperature gradients and improve heating efficiency. The temperature field distribution was simulated using COMSOL software. The process of synthesising (ZrTiCoNiNb)Ox using microwave heating was found to comprise four stages: thermal accumulation, local solid-phase reaction, synchronous reaction and grain growth. A phase transition from multi-phase mixing to a fixed high entropy phase was observed. The effectiveness of the mechanism of thermal field modulation was confirmed via analogue computation and experimentation.
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