A glass-ceramic with an ultrahigh bifurcation threshold

Abstract

The invention discloses a glass-ceramic with an ultra-high bifurcation threshold. The glass-ceramic has crystals with an average crystal size below 70nm, the proportion of crystals is 50wt%-90wt%, and the thickness of the glass-ceramics is 0.4mm-1.5mm. In the range of mm, the maximum tensile stress line density obtainable by glass-ceramics during strengthening is above 70000Mpa / mm, the bifurcation threshold is above 50000Mpa / mm, and the vertical projection average of the broken particles on the two-dimensional drawing after the anti-drop test The transmittance of glass-ceramics with a size of more than 10 mm and a thickness of 1 mm in the visible spectrum is in the range of 80% to 92%. The glass-ceramic of the present invention has a high network structure strength and a high crystal ratio, which can greatly increase the structural strength of the glass and at the same time increase its bifurcation threshold, which not only improves the limit of the drop-resistant strength of the glass-ceramics, but also guarantees the strength of the glass-ceramics on this basis. Tensile stress safety.

Description

technical field [0001] The invention relates to the technical field of glass production and manufacturing, in particular to a glass-ceramic with an ultra-high bifurcation threshold. Background technique [0002] With the advent of the intelligent era, the intelligence of various products will be rapidly popularized, ranging from houses, cars, and furniture to small audio, remote controls, and drinking fountains. The screen control is the basic part of most intelligent equipment. In order to adapt to various use environments of the product, as a protective material for the screen, it is necessary to further improve its acid and alkali resistance, temperature shock resistance, mechanical shock resistance and other characteristics, and must meet Requirements for various shapes and certain transparency requirements. [0003] At present, most of the screen protection materials are glass, which has the advantages of high transmittance, good stability, and acid and alkali resistan...

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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