Abstract
B2O3- or P2O5-doped Li2O-MgO-Al2O3-SiO2 (LMAS) glass-ceramics were prepared by solid state method using Li2CO3, MgO, Al2O3 and SiO2 as the raw materials, B2O3 or P2O5 as the additives. The effects of adding B2O3 and P2O5 on the phase separation, crystallization and thermal expansion coefficient were investigated by means of X-ray diffraction (XRD), differential thermal analysis (DTA), scanning electron microscopy (SEM) and thermal dilatometer, respectively. The results showed that B2O3 or P2O5 addition could promoted phase separation of glass and increased the size of spherical phase separation droplet. With the addition of B2O3 or P2O5, the crystallization temperatures (Tc) of LMAS system decreased from 764 oC to 726 oC and 764 oC to 750 oC, respectively. However, the crystalline phase compositions did not changed, and β-quartz solid solution (s.s) (Li2Al2Si3O10) was still the main crystalline phase, and lithium silicate (Li2SiO3) and forsterite (Mg2SiO4) were the minor phases. The thermal expansion coefficient (α) of B2O3-doped and P2O5-doped LMAS glass-ceramics in the temperature range 20-600 oC were 5.215×10-6/ oC and 5.008×10-6/ oC, respectively, which were higher than that of LMAS glass-ceramics (α=3.790×10-6/ oC).
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