ZHANG Yanchao¹, CHEN Yibin¹, ZENG Renjie^{1, 2}

(1. College of Materials, Xiamen University, Xiamen Fujiang 361005; 2. Fujian Province Key Laboratory of Special Advanced Materials, Xiamen Fujiang 361005)

Abstract: Lead-free sealing glasses in the SnCl₂-MgO-P₂O₅ system were prepared in reducing atmosphere. The glass-forming region, structure, characteristic temperature (transition temperature T_g and softening temperature T_f), coefficient of thermal expansion,as well as the water erosion of the glasses were investigated by XRD analysis, differential thermal analysis,Fourier transform infrared spectroscopic analysis, thermal expansion analysis, and grain mass loss method. The results show that a series of glass samples were prepared with a low characteristic temperature. The DTA curve shows a low T_g of a sample at 231℃. The FT-IR spectra indicate the glass structure of the sample, but the XRD pattern shows that the glass tends to crystallize. With the molar ratio of SnCl₂ /(SnCl₂+P₂O₅) increases, the T_f of the glasses decreases, whereas the Tf increases with the increasing of the content of MgO. Meanwhile, with the addition of MgO, the crystallization ability and of the glasses decrease, and the water erosion resistance of the glasses is improved which still can not meet the minimum requirement for stealing.

Key words:  lead-free; glass-forming region; characteristic temperature; water erosion resistance