Glass ceramic with ultrahigh bifurcation threshold value

Abstract

The invention discloses a glass ceramic with an ultrahigh bifurcation threshold value, the glass ceramic contains crystals with the average crystal size of less than 70nm, the crystal proportion is 50-90wt%, the thickness of the glass ceramic is 0.4-1.5 mm, the maximum tensile stress linear density of the glass ceramic in reinforcement is more than 85000 MPa / mm, and the bifurcation threshold value is more than 50000 MPa / mm; after a drop test, the average size of the vertical projection of crushed particles on a two-dimensional drawing is more than 10mm, and the transmittance of the glass ceramic with the thickness of 1mm on a visible spectrum is in a range of 80-92%. The glass ceramic has high network structural strength and high crystal proportion, the structural strength of the glass can be greatly improved, meanwhile, the bifurcation threshold value of the glass is improved, the limit of the anti-falling strength of the glass ceramic is improved, and the tensile stress safety of the glass ceramic is guaranteed on the basis of the limit of the anti-falling strength of the glass ceramic.

Description

[0001] The present invention is based on the application date of 2019.12.3, and the application number is 201911222200.0, and the present invention is: a score application for microcrystalline glass having ultra-high bifurcase thresholds. Technical field [0002] The present invention relates to the field of glass production, and more particularly to a microcrystalline glass having ultra-high branch thresholds. Background technique [0003] With the arrival of the intelligent era, intelligence of various products will be popularized, large to house, car, furniture, small to the audio, remote control, water dispenser, etc. The screen control is the basic part of most intelligent devices. To adapt to the various environments of the product, the protection material as a screen must further increase the characteristics such as acid and alkali, temperature impact, mechanical impact, and must be met The requirements of various shapes and certain transparency requirements. [0004] At pr...

AI Technical Summary

Problems solved by technology

However, most of the existing glass-ceramics on the market are sodium-calcium-silicon systems, which cannot be strengthened by chemical ion exchange, so the fracture toughness is seriously insufficient, and the overall performance is hard and brittle, so they cannot be used in portable electronic products, aviation aircraft, high-speed Protective windows for trains and other products; although ordinary high-alumina-silicon and lithium-aluminosilicate glasses commonly used in the cover glass industry can be strengthened and toughened by chemical ion exchange, they are limited to the lack of intrinsic structural strength of the glass network, and their bifurcation threshold has a limit , cannot support high tensile stress linear density. Although this kind of chemically tempered glass can accommodate high compressive stress, when the high tensile stress brought by compressive stress exceeds the bifurcation threshold, the glass will self-destruct under the action of internal tensile stress when broken. Splits, forming numerous fragments, with risk of self-explosion

When the bifurcation threshold is greatly exceeded, the glass will bifurcate and form fragments smaller than 1mm, which will splash around when broken, causing safety hazards

And if the display screen is broken to form fragments smaller than 1mm, it is difficult to continue to use

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