Lithium-free transparent spinel glass ceramic and preparation method therefor and use thereof

Abstract

A lithium-free transparent spinel glass ceramic and preparation method therefor and use thereof. The lithium-free transparent spinel glass ceramic is prepared from a base glass by heat treatment, and a spinel crystal is the main crystalline phase. The composition of the glass ceramic comprises the following oxides in mol %: SiO2 38.00 to 48.00 mol %, Al2O325.50 to 30.00 mol %, ZrO2 3.00 to 5.00 mol %, MgO 5.00 to 8.00 mol %, ZnO 8.00 to 14.00 mol %, Na2O 7.20 to 14.00 mol %, B2O3 3.00 to 8.00 mol %, K2O 0 to 2.00 mol % and Y2O3 0 to 1.00 mol %, and is substantially free of Li2O. The lithium-free transparent spinel glass ceramic does not use high-cost lithium, and can achieve excellent surface stress characteristics and deep-layer stress characteristics through chemical strengthening, thereby obtaining an excellent drop resistance performance.

Dependencies are inferred from the claim text.