Preparation of High Thermal Expansion Coefficient Glass-Ceramics in Li₂O-ZnO-SiO₂ System

Abstract:

Lithium carbonate, zinc oxide and silica as the main raw materials, potassium oxide and sodium as flux, phosphorus pentoxide as nucleating agent, the glass in Li₂O-ZnO-SiO₂ was synthesized by conventional melt cooling method and then converted to glass-ceramics. The crystallization behavior, microstructure and thermal expansion coefficient of the resulting glass-ceramics were investigated by XRD, SEM and thermal performance test. The results show that the Tg of the matrix glass is about 508°C, initial crystallization temperature is about 620°C. When the crystallization temperature ranges from 650°C to 750°C, the main crystal phase is Li₂ZnSiO₄. Increasing crystallization temperature to 850°C, much cristobalite crystals is formed. Owing to the high TEC of the cristobalite, the glass-ceramics with TEC of 12.27×10^-6°C^-1 were obtained, which is matched with the TEC of stainless steel SAE 1010.

• Periodical: Advanced Materials Research (Volume 412)
• Pages: 348-351
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.412.348
• Online since: November 2011
• Authors: Zhuo Hao Xiao, Li Gang Zhu, Sheng Long Wang
• Keywords: Crystallization, Glas Ceramics, Li₂O-Zno-SiO₂, Thermal Expansion Coefficient

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