GB1108474A - Devitrified glass-ceramics - Google Patents

Devitrified glass-ceramics

Info

Publication number
GB1108474A
GB1108474A GB2904667A GB2904667A GB1108474A GB 1108474 A GB1108474 A GB 1108474A GB 2904667 A GB2904667 A GB 2904667A GB 2904667 A GB2904667 A GB 2904667A GB 1108474 A GB1108474 A GB 1108474A
Authority
GB
United Kingdom
Prior art keywords
temperature
sio2
articles
total
zinc
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
GB2904667A
Inventor
Peter William Mcmillan
Graham Partridge
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.)
English Electric Co Ltd
Original Assignee
English Electric Co Ltd
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 English Electric Co Ltd filed Critical English Electric Co Ltd
Publication of GB1108474A publication Critical patent/GB1108474A/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

Abstract

In a strong devitrified glass-ceramic article, at least 80% by weight consists of the following, the figures being percentages by weight: ZnO, 32-56; Al2O3, 3-25; SiO2, 32-54; and a nucleation catalyst; the balance, if any, consists of other compatible consitituents. The article contains substantially no Li2O or TiO2. In addition, the article may contain, up to a total of 20%:Na2O and/or K2O, up to 6 in total; MgO, CaO, SrO, and/or BaO, up to 10 in total, PbO, up to 10; B2O3, up to 10. The nucleation catalyst may be one or more of: P2O5, up to 6.0; MoO3, up to 5.0; ZrO2, up to 7.5; preferably the catalyst is either P2O5 above, or MoO3 with either P2O5 or ZrO2. P2O5 may be added as metallic phosphate, e.g. zinc orthophosphate Zn3(PO4)2. The articles may be formed by melting a glass batch, shaping the glass, and heating to 1000-1250 DEG C. After shaping and before heat-treatment, the articles may optionally be annealed at 650-800 DEG C. and cooled to room temperature. In the heat-treatment the temperature of articles is raised by not more than 10 DEG C. per minute to 500-1250 DEG C. and held for at least 15 minutes. If the temperature is less than 1000 DEG C., the temperature is again raised at not more than 10 DEG C. per minute to a second holding stage at 1000-1250 DEG C. The cooling rate from the final temperature may be up to 10 DEG C./min. The major crystalline phase is zinc orthosilicate 2ZnO.SiO2. Other crystalline phases are zinc spinel ZnO.Al2O3, "galinite"; quartz, SiO2; and mullite, 3Al2O3,2SiO2. Coefficient of thermal expansion is may be 28.0 to 115.4 x 10-7/ DEG C. Some samples have dilatometric softening point > 900 DEG C.
GB2904667A 1964-01-24 1964-01-24 Devitrified glass-ceramics Expired GB1108474A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB314464A GB1108473A (en) 1964-01-24 1964-01-24 Surface-devitrified glasses
NL6516586A NL6516586A (en) 1964-01-24 1965-12-20

Publications (1)

Publication Number Publication Date
GB1108474A true GB1108474A (en) 1968-04-03

Family

ID=26238088

Family Applications (4)

Application Number Title Priority Date Filing Date
GB2904867A Expired GB1108476A (en) 1964-01-24 1964-01-24 Surface-devitrified glasses
GB2904667A Expired GB1108474A (en) 1964-01-24 1964-01-24 Devitrified glass-ceramics
GB2904767A Expired GB1108475A (en) 1964-01-24 1964-01-24 Devitrified glass-ceramics
GB314464A Expired GB1108473A (en) 1964-01-24 1964-01-24 Surface-devitrified glasses

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB2904867A Expired GB1108476A (en) 1964-01-24 1964-01-24 Surface-devitrified glasses

Family Applications After (2)

Application Number Title Priority Date Filing Date
GB2904767A Expired GB1108475A (en) 1964-01-24 1964-01-24 Devitrified glass-ceramics
GB314464A Expired GB1108473A (en) 1964-01-24 1964-01-24 Surface-devitrified glasses

Country Status (3)

Country Link
DE (1) DE1496496B2 (en)
GB (4) GB1108476A (en)
NL (1) NL6516586A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2140932A1 (en) * 1970-08-19 1972-02-24 Corning Glass Works Glass ceramics and process for their manufacture
US11236012B2 (en) 2018-03-28 2022-02-01 Corning Incorporated Boron phosphate glass-ceramics with low dielectric loss

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951669A (en) * 1974-11-18 1976-04-20 Corning Glass Works Fusion seals and sealing compositions for their production
US4714687A (en) * 1986-10-27 1987-12-22 Corning Glass Works Glass-ceramics suitable for dielectric substrates
US5082804A (en) * 1989-01-19 1992-01-21 David Sarnoff Research Center, Inc. Thick film copper via fill inks
US5084328A (en) * 1990-12-24 1992-01-28 Corning Incorporated Strong, surface crystallized glass articles
DE102010027461B4 (en) 2010-07-17 2019-08-22 Schott Ag Lithium-containing, transparent glass ceramic with low thermal expansion, a largely amorphous, lithium-depleted, predominantly glassy surface zone and high transmission, their preparation and use
GB201122178D0 (en) 2011-12-22 2012-02-01 Thermo Fisher Scient Bremen Method of tandem mass spectrometry
DE202012007249U1 (en) 2012-07-27 2012-10-30 Thermo Fisher Scientific (Bremen) Gmbh Analyzer for analyzing ions with a high mass-to-charge ratio
US8704193B1 (en) 2012-11-16 2014-04-22 Thermo Fisher Scientific (Bremen) Gmbh RF transformer
CN111763012B (en) * 2020-05-27 2022-07-08 维达力实业（赤壁）有限公司 Microcrystalline glass and tempering method and application thereof
GB2622256A (en) * 2022-09-08 2024-03-13 Corning Inc Glass-ceramic articles and methods of making them

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2140932A1 (en) * 1970-08-19 1972-02-24 Corning Glass Works Glass ceramics and process for their manufacture
JPS474979A (en) * 1970-08-19 1972-03-13
JPS5434776B2 (en) * 1970-08-19 1979-10-29
US11236012B2 (en) 2018-03-28 2022-02-01 Corning Incorporated Boron phosphate glass-ceramics with low dielectric loss

Also Published As

Publication number Publication date
GB1108476A (en) 1968-04-03
DE1496496B2 (en) 1971-11-04
NL6516586A (en) 1967-06-21
GB1108475A (en) 1968-04-03
DE1496496A1 (en) 1969-04-10
GB1108473A (en) 1968-04-03

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