Drying kinetics and microstructure evolution of nano-zirconia under microwave pretreatment

The effects of microwave power and sample quality on drying kinetics characteristics zirconia were studied. It is found that by increasing the decreasing mass, surface diffusion coefficient (Deff) appears to an upward tendency. corresponding value Deff at a mass 10, 20, 30, 40g are 1.849E-14, 2.443E-14, 3.210E-14, 3.278E-14 m2/s, respectively. 300, 400, 500, 600, 700W 1.270E-14, 1.784E-14, 2.619E-14, 3.392E-14, 4.497E-14 Besides, materials characterised X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FT-IR) evaluate changes before after drying. results show accelerates increases its dispersibility. heat conduction direction same as moisture diffusion, which avoids being affected inertia transfer loss. process fast efficient, directly penetrates product, avoiding disadvantage slow evaporation caused temperature gradient.