GB1347837A - Glass ceramic material - Google Patents

Glass ceramic material

Info

Publication number
GB1347837A
GB1347837A GB2924872A GB2924872A GB1347837A GB 1347837 A GB1347837 A GB 1347837A GB 2924872 A GB2924872 A GB 2924872A GB 2924872 A GB2924872 A GB 2924872A GB 1347837 A GB1347837 A GB 1347837A
Authority
GB
United Kingdom
Prior art keywords
glass ceramic
temperature
glass
mgo
zno
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.)
Expired
Application number
GB2924872A
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.)
Carl Zeiss AG
Original Assignee
Carl Zeiss AG
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
Priority claimed from DE19712132788 external-priority patent/DE2132788C/en
Application filed by Carl Zeiss AG filed Critical Carl Zeiss AG
Publication of GB1347837A publication Critical patent/GB1347837A/en
Expired 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
    • 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
    • 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
    • C03C10/0036—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 a divalent metal oxide as main constituents
    • C03C10/0045—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 a divalent metal oxide as main constituents containing SiO2, Al2O3 and MgO as main constituents

Abstract

1347837 Glass ceramics CARL-ZEISSSTIFTUNG [trading as JENAER GLASWERK SCHOTT & GEN] 22 June 1972 [1 July 1971] 29248/72 Heading C1M A transparent glass ceramic produced from a glass, which has been melted and shaped and thereafter subjected to a heat treatment for the controlled crystallization of innumerable, irregularly oriented, minute crystals of the structural type of #-quartz, wherein the glass ceramic has the following composition calculated as oxides on a percentage by weight basis: SiO 2 40-70, Al 2 O 3 15-30, P 2 O 5 0-10, Li 2 O 2-6, MgO 0-5, ZnO 0-8, ZrO 2 2-10, Ta 2 O 5 1-10, BaO and/or CaO 0-2, rare earth oxide(s) and/or yttrium oxide 0-12, refining agent(s) 0-5, Na 2 O and/or K 2 O 0-5; the contents of Li 2 O MgO, ZnO and P 2 O 5 being such that the Al 2 O 3 content, to within Œ4% by weight of the composition, is sufficient for forming the compounds LiAlO 2 , MgAl 2 O 4 , ZnAl 2 O 4 and AlPO 4 . The glass ceramic has a thermal longitudinal expansion of less than 15 Î 10<SP>-7</SP>/‹ C. in the temperature range 20-300‹ C. A suitable heat treatment would comprise heating the article up at about 10‹ C./hour to a temperature of 820-860‹ C., left at this temperature for 2 to 6 hours and then cooled at approximately 100‹ C./hour. More rapid heating procedures are also possible in which case a residence time of 2 to 4 hours at 680-750‹ C. is desirable.
GB2924872A 1971-07-01 1972-06-22 Glass ceramic material Expired GB1347837A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712132788 DE2132788C (en) 1971-07-01 COLORLESS, TRANSPARENT CERAMIC GLASS WITH NO THERMAL EXPANSION

Publications (1)

Publication Number Publication Date
GB1347837A true GB1347837A (en) 1974-02-27

Family

ID=5812403

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2924872A Expired GB1347837A (en) 1971-07-01 1972-06-22 Glass ceramic material

Country Status (3)

Country Link
FR (1) FR2143795B1 (en)
GB (1) GB1347837A (en)
NL (1) NL154183B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172282A (en) * 1985-03-11 1986-09-17 English Electric Co Ltd Toughened glass-ceramics
US10501367B2 (en) 2015-07-06 2019-12-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Ceramics and glass ceramics exhibiting low or negative thermal expansion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172282A (en) * 1985-03-11 1986-09-17 English Electric Co Ltd Toughened glass-ceramics
US10501367B2 (en) 2015-07-06 2019-12-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Ceramics and glass ceramics exhibiting low or negative thermal expansion

Also Published As

Publication number Publication date
NL154183B (en) 1977-08-15
NL7207920A (en) 1973-01-03
FR2143795A1 (en) 1973-02-09
DE2132788C2 (en) 1972-12-21
DE2132788B1 (en) 1972-05-31
FR2143795B1 (en) 1976-10-29

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee