GB1419068A - Glass ceramics - Google Patents

Glass ceramics

Info

Publication number
GB1419068A
GB1419068A GB5862971A GB5862971A GB1419068A GB 1419068 A GB1419068 A GB 1419068A GB 5862971 A GB5862971 A GB 5862971A GB 5862971 A GB5862971 A GB 5862971A GB 1419068 A GB1419068 A GB 1419068A
Authority
GB
United Kingdom
Prior art keywords
cao
glass ceramic
hours
temperature
dec
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
GB5862971A
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.)
UK Secretary of State for Trade and Industry
Original Assignee
UK Secretary of State for Trade and Industry
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 UK Secretary of State for Trade and Industry filed Critical UK Secretary of State for Trade and Industry
Priority to GB5862971A priority Critical patent/GB1419068A/en
Priority to JP47127085A priority patent/JPS4872217A/ja
Priority to DE19722261925 priority patent/DE2261925A1/en
Publication of GB1419068A publication Critical patent/GB1419068A/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
    • C03C10/0036—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

1419068 Glass ceramics TRADE & INDUSTRY SECRETARY OF STATE FOR 15 Dec 1972 [17 Dec 1971] 58629/71 Heading C1M A glass ceramic material having a lifetime at 1100‹ C. of at least 20 hours to 0À2% strain and/ or at least 60 hours to 0À3% strain under a bend stress of 77 MN/m.<SP>2</SP> is formed from a composition comprising, by weight, 40-55% SiO 2 , 25- 37% Al 2 O 3 , 8-15% MgO, 0-5% ZnO, 4-14% TiO 2 , 0-10% ZrO 2 , not greater than 0À15% CaO, not greater than 0À2% Na 2 O, not greater than 0À3% K 2 O, and not greater than 0À2% Li 2 O, wherein the total amount of CaO, Na 2 O, K 2 O and Li 2 O is not greater than 0À3%, the balance, if any, consisting of other compatible ingredients. These levels of alkali metal and calcium are low compared with what is normal in the constituent raw materials and accordingly it is necessary in the production of the glass ceramics to use raw materials which permit the overall concentration of alkali metal and calcium (in the products) to fall within the stated limits. The glass ceramic may optionally contain Fe 2 O 3 , Cr 2 O 3 , WO 3 , CeO 2 or ThO 2 . A typical heat treatment used for producing the glass ceramic is to heat at 800‹ C. for 4 hours, raise the temperature at 4‹ C./min. to 1040‹ C., then raise the temperature at 1À5‹ C./min. to 1280‹ C., and finally to hold at that temperature for 1 hour. Numerous examples of specific glass ceramic materials are disclosed. Comparative examples disclose compositions containing, in per cent by weight, 0À4% Na 2 O, 0À4% K 2 O, 0À2% CaO and 0À35% CaO.
GB5862971A 1971-12-17 1971-12-17 Glass ceramics Expired GB1419068A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB5862971A GB1419068A (en) 1971-12-17 1971-12-17 Glass ceramics
JP47127085A JPS4872217A (en) 1971-12-17 1972-12-18
DE19722261925 DE2261925A1 (en) 1971-12-17 1972-12-18 GLASS-CERAMIC MATERIAL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5862971A GB1419068A (en) 1971-12-17 1971-12-17 Glass ceramics

Publications (1)

Publication Number Publication Date
GB1419068A true GB1419068A (en) 1975-12-24

Family

ID=10482047

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5862971A Expired GB1419068A (en) 1971-12-17 1971-12-17 Glass ceramics

Country Status (3)

Country Link
JP (1) JPS4872217A (en)
DE (1) DE2261925A1 (en)
GB (1) GB1419068A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007144875A1 (en) * 2006-06-13 2007-12-21 D&D Salomon Investment Ltd. Glass-ceramic materials having a predominant spinel-group crystal phase
EP2065346A1 (en) * 2007-11-30 2009-06-03 Corning Incorporated High thermal conductivity cordierite glass-ceramic materials
EP3000793A1 (en) * 2014-09-25 2016-03-30 Schott AG Pore-free ceramic component
CN112533880A (en) * 2018-07-23 2021-03-19 康宁股份有限公司 Magnesium aluminosilicate glass-ceramics

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3954672A (en) * 1974-11-04 1976-05-04 General Motors Corporation Cordierite refractory compositions and method of forming same
FR2306956A1 (en) * 1975-04-11 1976-11-05 Gen Refractories Co CORDIERITE REFRACTORY MATERIAL AND ITS PREPARATION PROCESS
JPS5390318A (en) * 1977-01-20 1978-08-09 Iwanobuitsuchi Ritobuin Paberu Glassy crystalline matter and production thereof
JPS60141668A (en) * 1983-12-28 1985-07-26 日本碍子株式会社 Material for ceramic honeycomb structure
JPS60141667A (en) * 1983-12-28 1985-07-26 日本碍子株式会社 Material for ceramic honeycomb structure
US5476821A (en) * 1994-11-01 1995-12-19 Corning Incorporated High modulus glass-ceramics containing fine grained spinel-type crystals

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007144875A1 (en) * 2006-06-13 2007-12-21 D&D Salomon Investment Ltd. Glass-ceramic materials having a predominant spinel-group crystal phase
EP2065346A1 (en) * 2007-11-30 2009-06-03 Corning Incorporated High thermal conductivity cordierite glass-ceramic materials
WO2009070341A1 (en) * 2007-11-30 2009-06-04 Corning Incorporated High thermal conductivity cordierite glass-ceramic materials
EP3000793A1 (en) * 2014-09-25 2016-03-30 Schott AG Pore-free ceramic component
US11697619B2 (en) 2014-09-25 2023-07-11 Schott Ag Pore-free ceramic component
CN112533880A (en) * 2018-07-23 2021-03-19 康宁股份有限公司 Magnesium aluminosilicate glass-ceramics

Also Published As

Publication number Publication date
JPS4872217A (en) 1973-09-29
DE2261925A1 (en) 1973-09-06

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Legal Events

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