Effects of Additives on the Properties of SiO_2-B_2O_3-Al_2O_3-Na_2O-PbO System Glass Powders

摘要

The SiO_2-B_2O_3-Al_2O_3-Na_2O-PbO system glass powders were prepared by the high temperature water quenching and ball milling. The effects of CaO, Li_2O and ZnO with content of 1～5 wt.% on the glass-forming ability, softening temperature and crystallization behavior of the SiO_2-B_2O_3-Al_2O_3-Na_2O-PbO system glass powders were investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results showed that the glass crystallization tendency became obvious with the increase of CaO and Li_2O content, the melting temperature of the glass decreased with the addition of 1% Li_2O, while the effect of CaO with content lower than 2% on the formation of glass was not obvious. The addition of ZnO favored the formation of glass, however, the softening temperature of the glass increased with the increase of ZnO content. The softening temperature of the SiO_2-B_2O_3-Al_2O_3-Na_2O-PbO system glass powder decreased by 42.5℃ with the addition of 2%CaO-1 %Li_2O-1%ZnO.