Chemically strengthenable self-crystallizing glass ceramic and preparation method thereof

Abstract

The invention discloses a chemically strengthenable self-crystallizing glass ceramic and a preparation method thereof. The glass ceramic has crystals with the average crystal size ranging from 5 nm to60 nm, a main crystal phase of the crystals is at least one of a beta quartz solid solution, nepheline and a nepheline solid solution, the crystals account for 30%-90% by mass of the glass ceramic, and the glass ceramic contains 8%-13% of Li2O by mole, the content ratio of Al2O3 to Li2O is greater than or equal to 1.8, the sum of the content of the Li2O and the content of the Na2O is 10% to 15%,and nucleating agents ZrO2, TiO2 and fluoride are not added in the glass ceramic. The glass ceramic has the advantages of high aluminum content, high lithium content and low sodium content in composition, and contains no nucleating agent; the high lithium content increases the crystallization tendency of the glass substrate to realize uniform crystallization; the crystal growth speed can be controlled by the high aluminum content, so that the glass ceramic network structure is firm, and the mechanical strength is improved; the low nano content can reduce the dielectric constant of the glass ceramic.

Description

technical field [0001] The invention relates to the technical field of glass production, in particular to a chemically strengthenable self-crystallizing glass ceramic and a preparation method thereof. Background technique [0002] In recent years, due to the demand for 5G communication, the metal back cover material of smartphones has gradually been replaced by ceramic and glass materials. Due to the low yield rate and high cost of ceramic cover technology, the back cover materials of major manufacturers are currently glass. In this way, most of the outer surface of the smart phone is covered by glass materials, and higher requirements are placed on the strength of the glass protective cover. At present, the mainstream product of protective glass cover plate is lithium aluminum silicon chemically strengthened glass, which can carry out binary ion exchange of potassium-sodium ion and sodium-lithium ion, and exchange small alkali metal ions in the glass with large alkali metal...

AI Technical Summary

Problems solved by technology

[0005] At present, lithium aluminosilicate glass ceramics on the market, in order to promote crystallization of the glass matrix, generally add crystal nucleating agents ZrO2, TiO2, fluoride, etc., adding ZrO2 will increase the difficulty of glass melting and increase the melting temperature; adding TiO2 will cause The glass ceramics turn yellow; the addition of fluoride shortens the life of the kiln, increases production costs, and the exhaust gas will cause serious environmental pollution

[0006] In addition to the above production problems, lithium-aluminosilicate glass-ceramics on the market have poor strengthening properties due to the material formulation, and cannot obtain high surface compressive stress through chemical ion exchange, and due to the large crystal size, the visible light transmittance is small, so Although it has high mechanical strength and low thermal expansion coefficient, it cannot be directly used in mobile phone cover products

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