WO2012030796A2 - Surface nucleated glass ceramics for tv cover glass - Google Patents

Surface nucleated glass ceramics for tv cover glass Download PDF

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Publication number
WO2012030796A2
WO2012030796A2 PCT/US2011/049688 US2011049688W WO2012030796A2 WO 2012030796 A2 WO2012030796 A2 WO 2012030796A2 US 2011049688 W US2011049688 W US 2011049688W WO 2012030796 A2 WO2012030796 A2 WO 2012030796A2
Authority
WO
WIPO (PCT)
Prior art keywords
cover glass
glass according
glass
nucleated
glass ceramic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2011/049688
Other languages
English (en)
French (fr)
Other versions
WO2012030796A3 (en
Inventor
Sasha Marjanovic
Pamela Arlene Maurey
Daniel A Nolan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Corning Inc
Original Assignee
Corning Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corning Inc filed Critical Corning Inc
Priority to CN2011800416543A priority Critical patent/CN103261108A/zh
Priority to JP2013527181A priority patent/JP2013541485A/ja
Priority to EP11755486.5A priority patent/EP2611747A2/en
Publication of WO2012030796A2 publication Critical patent/WO2012030796A2/en
Publication of WO2012030796A3 publication Critical patent/WO2012030796A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
    • C03C10/0018—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents
    • C03C10/0027—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents containing SiO2, Al2O3, Li2O as main constituents
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
    • C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
    • C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
    • C03C23/007—Other surface treatment of glass not in the form of fibres or filaments by thermal treatment
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2203/00—Production processes
    • C03C2203/50—After-treatment
    • C03C2203/52—Heat-treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31—Surface property or characteristic of web, sheet or block
    • Y10T428/315—Surface modified glass [e.g., tempered, strengthened, etc.]

Definitions

  • Embodiments of the invention relate to surface nucleated glass ceramics and more particularly to surface nucleated glass ceramics useful for, for example, television (TV) cover glass .
  • TV television
  • compositions that contained T1O 2 resulted in the creation of colored glassware.
  • the glasses are melted and formed in a conventional way. Later, they are heat treated to promote surface crystallization. With controlled heat treatments, the glass can remain pristine below the surface, while overall glass transparency depends on the thickness of the crystalline layer. Further, the glass ceramics can be fully crystalline. Compressive stresses are generated at the glass ceramic surface upon cooling, therefore making strong glass ceramics, sometimes in excess of 700 MPa of flexural strength. There are some challenges associated with the process. For example, high temperature heat
  • Surface nucleated glass ceramics for TV cover glass applications as described herein may have one or more of the following advantages: the surface crystalline layer of the surface nucleated glass ceramic may be used to manipulate the scattering of light from such surface by growing crystals of various sizes and layer thicknesses and/or increased strength.
  • Such glass may be used as TV cover glass that can provide illumination when the TV is switched off.
  • High glass strength comes as an additional benefit for TV cover glass applications.
  • Conventional glass strengthening methods involve ion exchange processes.
  • Surface nucleated glass ceramics offer glass strength similar to those achieved by ion exchange, but potentially at a lower cost. If needed, the surface nucleated glass ceramics could be ion exchanged for additional strength improvement.
  • One embodiment is a cover glass for a television
  • Figure 1 is a cross sectional scanning electron
  • Figure 2 is a top view down scanning electron microscope (SEM) image of the surface nucleated glass ceramic, according to one embodiment.
  • Figure 3 is a transmittance spectral plot showing total and diffuse transmittance vs. wavelength of an exemplary glass ceramic .
  • Figure 4 is a plot of haze (diffuse or total
  • Figure 5 is a plot of the angular scattering of an exemplary glass ceramic.
  • planar can be defined as having a substantially topographically flat surface.
  • FIG. 1 One embodiment as shown in Figure 1 is a cover glass 100 for a television comprising a glass ceramic 10 comprising a surface nucleated portion 12.
  • the surface nucleated portion has an average thickness of from 30 microns to 150 microns.
  • the glass ceramic has the glass ceramic
  • the glass ceramic comprises two surface nucleated portions, one located at the first surface and another located at the second surface of the sheet .
  • the glass ceramic in one embodiment, comprises a zinc doped lithium alumina silicate.
  • High material strength is advantageous for tv cover glass.
  • Surface nucleated glass ceramics offer strength almost similar to those achieved by ion exchange, but at much lower cost. If needed, these glass ceramics can be ion exchanged for additional strength improvement. In some embodiments, the glass ceramic is ion exchanged.
  • the glass ceramic is ion exchanged in a salt bath comprising one or more salts of alkali ions.
  • the glass ceramic can be ion exchanged to change its mechanical properties.
  • smaller alkali ions such as lithium or sodium
  • a molten salt containing one or more larger alkali ions such as sodium, potassium, rubidium or cesium. If performed at a temperature well below the strain point for sufficient time, a diffusion profile will form in which the larger alkali moves into the glass ceramic surface from the salt bath, and the smaller ion is moved from the interior of the glass ceramic into the salt bath.
  • the surface will go under compression, producing enhanced toughness against damage.
  • a large alkali already in the glass ceramic can also be exchanged for a smaller alkali in a salt bath. If this is performed at temperatures close to the strain point, and if the glass is removed and its surface rapidly reheated to high temperature and rapidly cooled, the surface of the glass ceramic will show considerable compressive stress introduced by thermal tempering. It will be clear to one skilled in the art that any monovalent cation can be exchanged for alkalis already in the glass ceramic, including copper, silver, thallium, etc., and these also provide attributes of potential value to end uses, such as introducing color for lighting or a layer of elevated refractive index for light trapping .
  • the glass ceramic is planar.
  • the first surface and/or the second surface is substantially topographically flat, in one embodiment. In another embodiment, both surfaces are substantially topographically flat.
  • the surface nucleated glass ceramic in one embodiment, comprises glass ceramics comprising lithium alumina-silicate compositions, which have high strength after heat treatment, since compressive stresses are generated by the crystals at the glass ceramic surface upon their cooling.
  • glass ceramics comprising lithium alumina-silicate compositions, which have high strength after heat treatment, since compressive stresses are generated by the crystals at the glass ceramic surface upon their cooling.
  • the composition is doped with fluorine, chlorine, zinc, or combinations thereof.
  • the composition in one embodiment, comprises in mole percent: 60 to 70 S1O 2 , 10 to 20 AI 2 O 3 , and 5 to 15 Li 2 0.
  • the composition can further comprise greater than 0 to 20 percent RO, wherein R is an alkaline earth metal.
  • R is Ca, Mg, or a combination thereof.
  • the composition further comprises greater than 0 to 10 percent M 2 O, wherein M is an alkali metal. According to one embodiment, M is Na . Exemplary compositions in mole percent are found in Table 1.
  • the temperature and the length of the heat treatments can control the overall transparency, which depends on the thickness of the grown crystalline layer, while glass remains pristine bellow the crystallized surface.
  • the size of the crystals grown at the glass surface and the thickness of such crystal layer can manipulate and scatter the incoming light.
  • LED light-emitting diode
  • a cross sectional scanning electron microscope (SEM) image of a cover glass 100 for a television comprising a glass ceramic 10 comprising a surface nucleated portion 12,
  • the glass ceramic can be used to manipulate the
  • Crystals of various sizes within the surface nucleated portion can be used to affect the light scattering of the TV cover glass .
  • the average thickness of the glass ceramic is 3.2 millimeters (mm) or less, for example, from 0.7 millimeters to 1.8 millimeters.
  • the surface nucleated portion has an average thickness of 250 microns or less, for example, greater than zero to 250
  • microns for example, from 10 microns to 250 microns, for example, from 15 microns (ym) to 250 microns.
  • ym microns
  • the surface nucleated portion has an average thickness of 150 microns or less, for example, greater than zero to 150 microns, for example, from 10 microns to 150 microns, for example, from 15 microns (ym) to 150 microns.
  • the surface nucleated portions when there is more than one present have a total average thickness of 250 microns or less, for example, greater than zero to 250 microns, for example, from 10 microns to 250 microns, for example, from 15 microns (ym) to 250 microns.
  • a total average thickness of 250 microns or less, for example, greater than zero to 250 microns, for example, from 10 microns to 250 microns, for example, from 15 microns (ym) to 250 microns.
  • the surface nucleated portions have an average thickness of 150 microns or less, for example, greater than zero to 150 microns, for example, from 10 microns to 150 microns, for example, from 15 microns (ym) to 150 microns.
  • the glass ceramic is not fully crystalline. In another embodiment, the glass ceramic is 90 percent crystalline or less, for example, greater than zero percent to 90 percent crystalline. There is a layer of amorphous glass. In some embodiments, there are two surface nucleated portions sandwiching the amorphous glass.
  • Figure 10 is a transmittance spectral plot showing total, line 14, and diffuse, line 16, transmittance vs.
  • Figure 4 is a plot of haze shown by line 18 (diffuse or total transmittance ratio) for an exemplary glass ceramic.
  • the surface nucleated glass ceramics can contain small (around 1 micron) and larger (around 10 micron) scattering sites. This can provide a good angularly independent scattering. The small sites give a nearly angularly independent scattering which then enables nearly angularly independent viewing of the illuminated TV cover glass screen. This is shown in Figure 5 which is a plot of the angular scattering at 400nm, 600nm, 800nm, and lOOOnm of an exemplary glass ceramic. In the cover gl3.SS ⁇ SCCording to some
  • the glass ceramic comprises nucleated sites less than four times the wavelength of an illuminating source, for example, one or more LED lights.
  • the nucleated sites, feature 20 in Figure 2 should optimally be less than 2 microns in the linear length .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Glass Compositions (AREA)
  • Surface Treatment Of Glass (AREA)
PCT/US2011/049688 2010-08-31 2011-08-30 Surface nucleated glass ceramics for tv cover glass Ceased WO2012030796A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2011800416543A CN103261108A (zh) 2010-08-31 2011-08-30 用于电视机保护玻璃的表面核化的玻璃陶瓷
JP2013527181A JP2013541485A (ja) 2010-08-31 2011-08-30 Ｔｖカバーガラス用表面核生成ガラスセラミック
EP11755486.5A EP2611747A2 (en) 2010-08-31 2011-08-30 Surface nucleated glass ceramics for tv cover glass

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US37842610P 2010-08-31 2010-08-31
US61/378,426 2010-08-31
US13/212,587 2011-08-18
US13/212,587 US20120196109A1 (en) 2010-08-31 2011-08-18 Surface nucleated glass ceramics for tv cover glass

Publications (2)

Publication Number Publication Date
WO2012030796A2 true WO2012030796A2 (en) 2012-03-08
WO2012030796A3 WO2012030796A3 (en) 2012-04-26

Family

ID=44645802

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2011/049688 Ceased WO2012030796A2 (en) 2010-08-31 2011-08-30 Surface nucleated glass ceramics for tv cover glass

Country Status (6)

Country Link
US (1) US20120196109A1 (https=)
EP (1) EP2611747A2 (https=)
JP (1) JP2013541485A (https=)
CN (1) CN103261108A (https=)
TW (1) TW201228966A (https=)
WO (1) WO2012030796A2 (https=)

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CN105110636A (zh) * 2010-09-27 2015-12-02 旭硝子株式会社 玻璃、化学强化玻璃及显示装置用玻璃板
US9604871B2 (en) 2012-11-08 2017-03-28 Corning Incorporated Durable glass ceramic cover glass for electronic devices
CN105658593B (zh) * 2013-08-23 2019-07-09 康宁股份有限公司 强化的玻璃制品、边缘强化的层叠玻璃制品及其制造方法
US9878940B2 (en) 2014-02-21 2018-01-30 Corning Incorporated Low crystallinity glass-ceramics
JP7268673B2 (ja) 2018-02-27 2023-05-08 Ａｇｃ株式会社 ３次元形状の結晶化ガラス、３次元形状の化学強化ガラスおよびそれらの製造方法
WO2020161949A1 (ja) * 2019-02-08 2020-08-13 Ａｇｃ株式会社 結晶化ガラス、化学強化ガラスおよび半導体支持基板

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See also references of EP2611747A2

Also Published As

Publication number Publication date
TW201228966A (en) 2012-07-16
JP2013541485A (ja) 2013-11-14
CN103261108A (zh) 2013-08-21
WO2012030796A3 (en) 2012-04-26
US20120196109A1 (en) 2012-08-02
EP2611747A2 (en) 2013-07-10

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