关键词: 无铅熔块, 熔融温度, 弯曲强度, 化学稳定性

Abstract:

Lead-free frit was first prepared by the melting method.Then,the effects of CeO₂,Li₂O and ZrO₂ on the performances of the frit,such as the maturing temperature range,the thermal expansion coefficient,the flexural strength and the chemical stability,etc.,were investigated by using the high-temperature microscope,the therm alexpansion analyzer,XRD and SEM.The results indicate that(1)with the addition of CeO₂,the initial fusing tem-perature of the frit decreases,while the maturing temperature increases;(2)both the initial fusing temperature and the maturing temperature decrease by 30 to 50℃ if 1.5% (mass fraction)Li₂O is added;(3)the chemical sta-bility of the frit can be improved by adding ZrO₂ to the frit;and(4)the flexural strength of the frit can be greatly improved by adding CeO₂ and ZrO₂ together.Finally,a kind of excellent frit with a maturing temperature of 850 to 900℃ .a flexural strength more than 70 MPa and a mass loss in chemical solution less than 100 μg/cm was pre-pared.

Key words: lead—free frit, maturing temperature, flexural strength, chemical stability