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Toughened glass ceramic with low surface compressive stress and raw glass

A surface compressive stress, strengthening glass technology, applied in the field of glass, can solve the problems of signal transmission time delay, low dielectric loss of glass, signal strength attenuation and so on

Pending Publication Date: 2021-03-05
CHONGQING XINJING SPECIAL GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, with the advent of the 5G era, 5G communication also has higher requirements for electronic equipment. Exposure of ordinary glass to high-frequency or ultra-high-frequency electromagnetic fields will result in slower transmission speed, signal strength attenuation, and signal transmission time delay. Requires glass with low dielectric loss

Method used

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  • Toughened glass ceramic with low surface compressive stress and raw glass
  • Toughened glass ceramic with low surface compressive stress and raw glass
  • Toughened glass ceramic with low surface compressive stress and raw glass

Examples

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Effect test

preparation example Construction

[0069] The preparation method of the strengthened glass-ceramic is to prepare the strengthened glass-ceramic after performing microcrystallization heat treatment and ion exchange treatment on the original glass.

[0070] The key to the preparation method lies in the physical and chemical characteristics of the original glass. Specifically, the original glass, in molar percentage, contains the following composition: 60-80% SiO 2 ;3-11% Al 2 o 3 ;0.5-8% P 2 o 5 and / or B 2 o 3 ;7-18% Li 2 O; 0-2% Na 2 O; 0-2% K 2 O; 1-6% ZrO 2 ;0-2% TiO 2 ;0-1% SnO 2 . Preferably, the original glass contains 68-75% SiO 2 ; 5-7% Al 2 o 3 ;2-7% P 2 o 5 and / or B 2 o 3 ;7.5-15% Li 2O; 0-1% Na 2 O; 0-1% K 2 O; 2-5% ZrO 2 ;0-1% TiO 2 ;0.1-0.5% SnO 2 . Optionally, the original glass also includes 0-8 mol% of other oxides, the other oxides include MgO, ZnO and Tm 2 o 3 one or more of. Optionally, the original glass may not contain Na 2 O.

[0071] The Young's modulus of the...

Embodiment 1-5

[0078] Example 1-5: Preparing strengthened glass ceramics from raw glass

[0079] In Examples 1-5, the original glass I, original glass II, original glass III, original glass IV, and original glass V of batches (1000 pieces) were passed through the above-mentioned microcrystallization heat treatment and ionization respectively. The exchange treatment produced batches (1000 pieces) of strengthened glass-ceramics I, strengthened glass-ceramics II, strengthened glass-ceramics III, strengthened glass-ceramics IV, and strengthened glass-ceramics V.

[0080] The physical and chemical characteristics of the original glass I to V are shown in the table below.

[0081]

[0082] The parameters involved in microcrystallization heat treatment and ion exchange treatment of original glass I, original glass II, original glass III, original glass IV and original glass V are shown in the table below.

[0083]

[0084]

[0085] The composition of the crystals in the prepared strengthe...

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Abstract

The invention discloses toughened glass ceramic with low surface compressive stress and raw glass. The surface compressive stress of the toughened glass ceramic is 100-450Mpa, the layer depth of compressive stress is less than or equal to 180 [mu]m, the maximum value of internal tensile stress is less than or equal to 180Mpa, the linear density of the tensile stress is less than or equal to 60000Mpa / mm, and the dielectric loss tangent at the room temperature and the frequency of 1.8 GHz is less than or equal to 9 x 10<-3>. The toughened glass ceramic is obtained by carrying out micro-crystallization heat treatment and ion exchange treatment on raw glass with special physicochemical characteristics, and the toughened glass ceramic has enough strength to serve as a front protective cover ora rear protective cover of electronic equipment. Due to the nanocrystals which are uniformly distributed on the whole, the toughened glass ceramic has very high intrinsic strength, and the toughened glass ceramic still has high glass anti-falling strength after low surface compressive stress is achieved through chemical strengthening. Therefore, in the industrial production process, the strength of the low-CS-value toughened glass ceramic is less affected by the content change of garbage ions Na<+> and Li<+> in a salt bath and the distribution of large alkali metal ions, and the strength uniformity of the toughened glass ceramic finally produced on a large scale is ensured to be higher.

Description

technical field [0001] The invention relates to the technical field of glass, in particular to a strengthened glass ceramic with low surface compressive stress and original glass. Background technique [0002] The front and rear cover protection materials of current electronic equipment (such as smart phones, laptop computers, tablet computers, etc.) are generally glass. In order to make the mobile phone lighter and thinner as a whole, the glass used as the protective cover of the mobile phone is also getting thinner and thinner. In order to make the thin and light glass achieve sufficient strength, the current strengthening method is usually chemical strengthening method, specifically adding large alkali in a salt bath Metal ions, such as potassium ions and sodium ions, exchange sodium ions and lithium ions inside the glass under high temperature conditions, and finally due to the volume difference effect of the exchanged ions, compressive stress is generated inside the gla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/04C03C10/06C03C10/08C03C10/12C03C3/097C03B32/02C03C21/00
CPCC03C10/0045C03C10/0036C03C10/0027C03C10/00C03C3/097C03B32/02C03C21/002
Inventor 胡伟谈宝权张延起覃文城
Owner CHONGQING XINJING SPECIAL GLASS CO LTD
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