Interface control of glass-based long afterglow composite material for solid waste recycling by epoxy resin gel casting

Long afterglow materials were widely used in road lighting and safety indication because they could continue to emit light even after the excitation source stops. Due to the high cost associated with preparing long afterglow phosphor in glass, in this study, the long afterglow material SrAl 2 O 4 :Eu 2+ , Dy 3+ was combined with glass powder and solid waste. A new type of epoxy resin gel casting system was adopted. The sintering system of debinding at 700 °C for 2 h and then sintering at 825 °C was confirmed. By adjusting the demolding, drying, and sintering processes of the green body, the performance of the composite material was enhanced. Finally, the glass-based long afterglow composite material with a smooth appearance and distinct interface was obtained. We conducted strength and corrosion resistance tests on the prepared samples. The results showed that the flexural strength of the sample was 46.3 MPa and it had good mechanical strength. The average coefficient of friction was approximately 0.24. It was not easy to wear out and had a long service life. The electrochemical experiments indicated that the Nyquist plot showed that the impedance value of the material in the high-frequency region exceeded 10 3  Ω, indicating good initial corrosion resistance. Meanwhile, the impedance value in the low-frequency region was still higher than 10 1  Ω, demonstrating excellent corrosion resistance. The slope of the Bode plot curve being close to 1 indicated that there was a diffusion control process on the electrode surface, with a low corrosion rate and strong corrosion resistance of the sample. Therefore, this experiment provided a new feasible approach for the preparation of long afterglow phosphor composite materials by solid waste recycling.