A chemically strengthened self-crystallizing glass-ceramic and its preparation method

Abstract

The invention discloses a chemically strengthened self-crystallizing glass ceramic and a preparation method thereof. The glass ceramic has crystals with an average crystal size ranging from 5nm to 60nm, and the main crystal phase of the crystal is β-quartz solid solution, nepheline and nepheline solid solution At least one of, the mass percentage of the crystals in the glass ceramics ranges from 30% to 90%, and the composition of the glass ceramics contains 8% to 13% Li in terms of molar percentages. 2 O, 55~65% SiO, 16~23% Al 2 o 3 , 2~5% Na 2 O, 1~6% B 2 o 3 , 1~8% MgO, Al 2 o 3 with Li 2 O content ratio is greater than or equal to 1.8, Li 2 O and Na 2 The total O content is between 10% and 15%, and no crystal nucleating agent ZrO is added to the glass ceramics 2 、TiO 2 , fluoride, and does not contain P 2 o 5 .

Description

technical field [0001] The invention relates to the technical field of glass production, in particular to a chemically strengthened 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In recent years, due to the demand for 5G communication, the metal back cover material of smartphones has gradually been replaced by ceramic and glass materials.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 i...

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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