Thermal Expansion Property of P₂O₅ Doped Lithium Aluminosilicate Glass-Ceramic Synthesized by Sol-Gel Process

Abstract:

Lithium aluminosilicate (LAS) glass-ceramics with 0 ~ 10 wt% phosphoric anhydride were prepared by sol-gel method and sintering at high temperature. Tetraethyl orthosilicate (TOES), aluminum nitrate, lithium carbonate were used as precursors. Differential thermal analysis (DTA), X-ray powder diffraction (XRD) and thermal expansion coefficient (TEC) were used to characterize the dried LAS gels and glass-ceramic blocks. The results suggest β-spodumene solid-solution is the only crystals phase in the P2O5 doped LAS glass-ceramics when sintering temperature is 950 oC. The thermal expansion coefficient of the P2O5 doped LAS glass-ceramics range from -0.1×10-6 oC-1 to 1.2×10-6 oC-1. Compared with the conventional melt quenching method, this process route provides a low temperature and timesaving method for preparing LAS glass-ceramics.

• Periodical: Materials Science Forum (Volumes 663-665)
• Pages: 1281-1284
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.663-665.1281
• Online since: November 2010
• Authors: Zhuo Hao Xiao, Wen Yan Luo, Sheng Long Wang
• Keywords: Glas Ceramics, Lithium Aluminosilicate, Sol-Gel Process, Thermal Expansion Property

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