Investigation On Interface Character Of Lithium Aluminosilicate Glass By Float Process

Lithium aluminosilicate (LAS) glass-ceramics have been applied in many fields and attract a great lot of attentions recently owing to low thermal expansion coefficient, high thermal resistance, transparence, good mechanical properties, well dielectric constant, good thermal and chemical stability etc. Meanwhile, the float process has been widely applied in flat glass manufacture due to low cost of production, good surface quality, more variety of production and better continuity of manufacturing. It's recognized as the best method of large-scale flat glass manufacture. Therefore, if the float process could be applied in the LAS glass-ceramics manufacture would apparently be economical and scientific significance.In the present dissertation, the crystallization and tin penetration of float LAS glass during the float process were focused on. Initially, the temperature of LAS glass float process was determined by testing the high temperature viscosity and expansion coefficient. The glass sample was kept on the tin liquor, which was hold in the high-purity graphite tin bath, for different time under the different temperature. All courses took place under the shielding gas N2. Then, investigated the influence of temperature, timing, and the content of Li2O and nucleating agent to the interface character of float LAS glass by means of XRD, SEM, EMPA etc.The results indicated that the temperature range of LAS glass float process is 710℃-1300℃. During the float process, the crystallization grade has ascended owing to the rise of temperature at first, and reduced later. The main crystal phase isβ-quartz solid solution andβ-spodumene solid solution. The amount of tin penetration increases with the rise of temperature. The crystallization grade increase with prolonging time, but tin penetration might decrease on account of the increase of crystallization grade. The tin penetrated into the surface area of LAS glass centralize in the glass phase, very little amount has come into crystal phase. The crystallization hasn't been observed during the temperature fall process. The crystallization increase as a result of accession of nucleating agent TiO2 and ZrO2, and make the amount of tin penetration decrease, but the influence isn't very notable. There're evidences indicate that nucleating process hasn't been observed during the float process in the sample with nucleating agent. The increase of Li2O content makes crystallization degree ascend, synchronously causes the decrease of tin penetration amount.