Abstract
The effects of TiO2 and CaF2 on the crystallization kinetics, microstructure, phase evolution and microhardness of Y2O3-Al2O3-SiO2 glass ceramics were investigated by differential scanning calorimetric (DSC), field emission scanning electron microscope (FESEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) techniques. The results show that the addition of TiO2 is effective to promote crystallization by decreasing the activation energy, refining the grain size and increasing the microhardness. However, the CaF2 plays an opposite role by increasing the activation energy, coursing the grain size and decreasing the microhardness. Furthermore, the addition of TiO2 induces bulk crystallization of Y2O3-Al2O3-SiO2 glass. On the contrary, the addition of CaF2 leads to surface crystallization and decreasing of thickness of surface crystallized layer.
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