Properties of Ultra-low Thermal Expansion LAS Transparent Glass-ceramics Prepared by Spodumene

Abstract

The glass-ceramics were prepared with the spodumene mineral as the main raw material, and the effects of ZrO₂ replacing TiO₂ on the samples were systematically investigated. The results show that the substitution of ZrO₂ for TiO₂ is not conductive to precipitate β-quartz solid solution phase, but can improve the transparency and flexural strength of glass-ceramics. And the glass-ceramic with the highest visible light transmittance (87%) and flexural strength (231.80 MPa) exhibits an ultra-low thermal expansion of −0.028×10⁻⁷ K⁻¹ in the region of 30–700 °C.

Keywords

ultra-low thermal expansion / LAS transparent glass-ceramics / substitution of ZrO₂ for TiO₂ / spodumene mineral

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