The Effects of Co2O3 Addition on Crystallization,Microstructure and Properties of Cordierite-Based Glass-Ceramics

The Co₂O₃ doped MgO-Al₂O₃-SiO₂-B₂O₃ (MASB) glass-ceramics were successfully fabricated by traditional melt quenching method and the following heat treatment. The effect of Co₂O₃ addition on crystallization behavior, glass networks, microstructure and physical properties was investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), Fourier transform infrared absorption spectra (FTIR) and scanning electron microscopy (SEM) measurements. The results show that the metastable phase μ-cordierite and α-cordierite precipitated from the parent glass during the thermal treatment process. With the increase of Co₂O₃ content, the crystallization tendency of the parent glass increased, and the addition Co₂O₃ favored the transformation from μ-cordierite to α-cordierite. Meanwhile, the grain size of glass-ceramics increased obviously, Simultaneously, the mechanical strength of glass-ceramics increased first and then decreased, while the thermal expansion coefficient decreased. Glass-ceramic with excellent thermal and physical properties were prepared by adding 0.1 mol% Co₂O₃ content and then crystallizing it at 1020 ^°C for 3 h.