Abstract

Al₂O₃–ZrO₂ composite ceramic is a significant structural material and functional material, and the preparation of high-quality Al₂O₃–ZrO₂ powder is a key step to meeting practical application requirements. The major factor affecting the quality of Al₂O₃–ZrO₂ powder is the drying effect. This paper uses modern microwave drying technology to dry Al₂O₃–ZrO₂ powder. The result was indicative that the average drying rate increases with initial moisture content, initial mass, and microwave heating power. Four dynamic models were applied to fit the empirical data of Al₂O₃–ZrO₂ powder under different pretreatment conditions, the Modified Page model can precisely delineate the Al₂O₃–ZrO₂ microwave drying procedure. To evaluate the changes in samples before and post-drying, the specimens were characterized by Fourier transform infrared spectroscopy. These results demonstrate that microwaves can accelerate the drying of Al₂O₃–ZrO₂ and improve its dispersion. Fick’s second law calculates the effective diffusion coefficient. When the initial moisture content of Al₂O₃–ZrO₂ was 5.6%, the microwave heating power is 560 W, and the initial quality is 15 g, the effective diffusion coefficient of Al₂O₃–ZrO₂ is 0.006361 m²/s. Based on the relevance of the microwave power and activating energy, the activating energy of microwave drying Al₂O₃–ZrO₂ was calculated, which is −34.80 g/W. This paper provides basic study data and theory instructions for microwave drying technology in drying Al₂O₃–ZrO₂ even the drying process in green metallurgy.