Microcrystalline glass and substrate thereof

Abstract

The invention provides microcrystalline glass and a substrate thereof. The microcrystalline glass is low in liquidus temperature, and comprises the following components in percentage by weight: 60 to80 percent of SiO2; 4 to 20 percent of Al2O3; 0 to 15 percent of Li2O; greater than 0 and smaller or equal to 12 percent of Na2O; 0 to 5 percent of K2O; greater than 0 and smaller or equal to 5 percent of ZrO2; 0 to 5 percent of P2O5; 0 to 10 percent of TiO2. Crystalline phase contains one or more of R2SiO3, R2Si2O5, R2TiO3, R4Ti5O12, R3PO3, RAlSi2O6, RAlSiO4O10, R2Al2Si2O8, R4Al4Si5O18, quartz and quartz solid solution. The liquidus temperature of the microcrystalline glass is 1450 DEG C or less, the heat conductivity is 2w / m.k or more, the Vickers hardness is 600 kgf / mm<2> or more, and the microcrystalline glass is applicable to portable electronic equipment and optical equipment.

Description

technical field [0001] The present invention relates to a glass-ceramic and a substrate based on the glass-ceramic, in particular to a glass-ceramic with high thermal conductivity and high strength suitable for protective components such as portable electronic equipment or optical equipment. Glass-ceramics and substrates. Background technique [0002] For portable electronic devices such as smartphones, tablet PCs, and other optical devices, back covers are required to protect the internal electronics. For these protective materials for the back cover, especially for electronic devices that require wireless signals, they are required to have high thermal conductivity, different individual colors and high strength, and can be used in harsh environments, and Good processing performance. In the past, metal was usually used as the protective material for the back cover, but the metal back cover would seriously affect the reception of the signal, so it could only be designed in...

AI Technical Summary

Problems solved by technology

[0007] Lithium disilicate glass-ceramic has good strength and toughness, and through chemical stiffening or physical strengthening, it can produce better glass-ceramic strength effect, which can be used in portable electronic devices such as smart phones, tablet PCs and other optical devices. Equipment protection cover, but because the lithium disilicate glass-ceramic is easy to crystallize when the original glass is formed, it can only be molded under the condition of fluid, and the cooling speed is fast, so that the crystallization will not occur during molding, so it is not very good Traction, overflow, rolling, blow molding and down-draw molding cannot be carried out in large quantities, resulting in low production efficiency

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