Effect of CuO Doping on the Structure and Thermal Properties of ZnO-B2O3-Bi2O3 Glass
In order to reduce the softening temperature of borate lead-free sealing glass,the effect of CuO doping(0-15%)on the structure and thermal properties of 40ZnO-30B2O3-30Bi2O3 glass was investigated.The results showed that homogeneous glass was formed in the range of test compositions under the melting process at 950℃for 2 h.With the increase of CuO doping,the ratio of[BO3]/[BO4]units in ZnO-B2O3-Bi2O3 glass system increased and then decreased,and reached the maximum at 8%CuO doping.The number of[BO3]units was relatively more at 8%CuO doping.With the further increase of CuO incorporation,it gradually transformed part of[BO3]to[BO4].Furthermore,the glass transition temperature and the crystallization temperature decreased gradually with the increase of CuO doping.The rate of mass loss decreased gradually at 400-850℃,but showed a trendency of increasing mass at 15%high doping.The thermal expansion coefficient of the glass(25-450℃)remained almost unchanged with the increase of CuO doping,and kept about 7.10×10-6℃-1.The softening temperature and hemispherical temperature of the glass showed a trendency of decreasing and then increasing,and the softening temperature and hemispherical temperature were the lowest when the CuO doping was 8%.
ZnO-B2O3-Bi2O3low melting point glassthermal expansion coefficientsoftening temperatureCuO
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