White, opaque, beta-spodumene/rutile glass-ceramics,articles comprising the same,and methods for making the same

A spodumene and glass technology, applied in glass manufacturing equipment, glass molding, manufacturing tools, etc., can solve problems such as damage to the internal/electronic components of portable computing devices, user dissatisfaction, etc.

Active Publication Date: 2015-05-13
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the added weight of the stronger, harder plastic structure can lead to user dissatisfaction, while the wrinkling and bending of the lighter structure can damage the internal / electronic components of the portable computing device and almost certainly cause user dissatisfaction

Method used

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  • White, opaque, beta-spodumene/rutile glass-ceramics,articles comprising the same,and methods for making the same
  • White, opaque, beta-spodumene/rutile glass-ceramics,articles comprising the same,and methods for making the same
  • White, opaque, beta-spodumene/rutile glass-ceramics,articles comprising the same,and methods for making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0140] The following examples illustrate some of the advantages and characteristics of the invention and are not intended to limit the invention thereto.

[0141] Since the sum of the individual components is about or very close to 100, for all practical purposes the reported values ​​are to be understood as expressing mole percent. The actual crystallizable glass batch components may comprise any material, including oxides or other compounds, which, when melted together with the other batch components, will convert to the desired oxides in the proper proportions.

[0142]

[0143]

[0144] Examples 1-8: Exemplary crystallizable glasses listed in Table I were prepared in platinum crucibles using raw material batches formulated to yield 1000 grams of crystallizable glass after melting and fining. Each crucible containing the formulated raw material batch is placed in a furnace preheated to 1575-1650°C, the formulated raw material batch is melted and clarified to produce m...

Embodiment A

[0153] Example A: Nucleation (heating at 5°C / min to 780°C and holding at 780°C for 2 hours) and crystallization (heating at 5°C / min from 780°C to 975°C and holding at 975°C for 4 hours) The cake of the crystallizable glass in Example 1 of Table I was heat-treated to obtain a glass-ceramic. Glass-ceramic samples 50 x 50 cm square and 0.8 mm thick were produced with optically polished surfaces prepared. The opacity of the sample was determined by measuring the spectral reflectance of the polished sample using a black and white background behind the sample. The opacity of the sample is the ratio of the reflectance of the sample measured by the above two methods; a value of 1 means 100% opacity. figure 1 Showing the opacity exhibited by this example, it can be seen that in the wavelength range of 250-750 nm, the opacity values ​​exceed 90% opacity.

Embodiment B-D

[0154] Examples B-D: Three cakes of the crystallizable glass in Example 1 of Table I were heat-treated using different crystallization conditions to obtain glass-ceramics. Each cake was nucleated in the same manner as described above in Example 1 (heating at 5°C / min to 780°C and holding at 780°C for 2 hours), but each cake was listed in Table II Crystallization at the different temperatures indicated for 4 hours (heating from 780°C to Tc[°C] at 5°C / min and holding at Tc[°C] for 4 hours). As determined by XRD analysis, the resulting glass-ceramic exhibited a combination of crystalline phases comprising a solid solution of β-spodumene as a major crystalline phase and a secondary crystalline phase including rutile. The amount of crystalline phase and residual glass (in % by weight) in each sample was determined using the Rietveld analysis method known to those skilled in the art, as described, for example, in Taylor, J.C. ( 2004, 2003, & 2001), "Rietveld Made Easy: A Practical G...

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Abstract

Crystallizable glasses, glass-ceramics, IXable glass-ceramics, and IX glass-ceramics are disclosed. The glass-ceramics exhibit beta-spodumene ss as the predominant crystalline phase. These glasses and glass-ceramics, in mole %, include: 62-75 SiO2; 10.5-17 Al2O3; 5-13 Li3O; 0-4 ZnO; 0-8 MgO; 2-5 TiO2; 0-4 B2O3; 0-5 Na2O; 0-4 K2O; 0-2 ZrO2; 0-7 P2O5; 0-0.3 Fe2O3; 0-2 MnOx; and 0.05-0.2 SnO2. Additionally, these glasses and glass-ceramics exhibit the following criteria: a. a ratio: [ Li 2 ⁢ O + Na 2 ⁢ O + K 2 ⁢ O + MgO + ZnO _ ] ⁢ [ Al 2 ⁢ O 3 + B 2 ⁢ O 3 ] between 0.7 to 1.5; b. a ratio: [ TiO 2 + SnO 2 _ ] ⁢ [ SiO 2 + B 2 ⁢ O 3 ] greater than 0.04. Furthermore, the glass-ceramics exhibit an opacity >=about 85% over the wavelength range of 400-700 nm for an about 0.8 mm thickness and colors an observer angle of 10° and a CIE illuminant F02 determined with specular reflectance included of a* between -3 and +3, b* between -6 and +6, and L* between 88 and 97.

Description

[0001] priority statement [0002] This application claims priority under 35 U.S.C. §119 to U.S. Provisional Application Serial No. 61 / 623905, filed April 13, 2012, the contents of which are hereby incorporated by reference in their entirety. field of invention [0003] The present invention relates to crystallizable glasses (precursor glasses that can be crystallized into glass-ceramics), glass-ceramics, ion-exchangeable ("IXable") glass-ceramics and / or ion-exchanged ("IX") glasses - Ceramics; processes for their manufacture; and articles comprising them. In particular, the present invention relates to crystallizable glasses (precursor glasses formulated to crystallize into a white opaque glass-ceramic comprising a β-spodumene solid solution as the major crystalline phase and a Ti-containing crystalline phase As subcrystalline phases, the Ti-containing crystalline phases include rutile), white opaque β-spodumene glass-ceramic, ion-exchangeable white opaque β-spodumene glass-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/12
CPCC03C3/085C03C3/093C03C10/0027C03C21/002Y10T428/315C03B32/02C03C14/00C03C10/0009C03B20/00C03C14/006
Inventor G·H·比尔M·J·M·孔德G·O·戴尔L·R·平克尼C·M·史密斯R·L·斯图沃特S·A·蒂切
Owner CORNING INC
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