GB691870A - Improvements in or relating to glass compositions and glass-metal seals - Google Patents

Improvements in or relating to glass compositions and glass-metal seals

Info

Publication number
GB691870A
GB691870A GB2300550A GB2300550A GB691870A GB 691870 A GB691870 A GB 691870A GB 2300550 A GB2300550 A GB 2300550A GB 2300550 A GB2300550 A GB 2300550A GB 691870 A GB691870 A GB 691870A
Authority
GB
United Kingdom
Prior art keywords
glass
sro
bao
per cent
cao
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
GB2300550A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB2300550A priority Critical patent/GB691870A/en
Publication of GB691870A publication Critical patent/GB691870A/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
    • 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
    • C03C3/112—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine
    • 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
    • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
    • C03C27/02—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing by fusing glass directly to 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
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/078—Glass compositions containing silica with 40% to 90% silica, by weight containing an oxide of a divalent metal, e.g. an oxide of zinc
    • 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
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
    • 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
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
    • C03C3/105—Glass compositions containing silica with 40% to 90% silica, by weight containing lead containing aluminium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Glass Compositions (AREA)

Abstract

691,870. Glass composition. GENERAL ELECTRIC CO., Ltd., and PARTRIDGE, J. H. Sept. 19, 1951 [Sept. 19, 1950], No. 23005/50. Class 56. A glass suitable for sealing directly to iron or other metal of like thermal expansion characteristic has the following weight percentage composition, SiO, 45-50, one or more of CaO, SrO, BaO 25-37 the CaO being not more than 10, one or more of Na 2 O, Li 2 O, K 2 O 18-20, PbO plus ZnO 0-5 the ZnO if present being less than 5, F 0-2, and Al 2 O 3 0-2. Preferably the maximum percentages of the alkaline earth oxides are CaO 8, SrO 25, BaO 30, and if the total alkaline earth content is 30-37 per cent and the SrO or BaO exceeds 20 per cent then the other of these oxides is less than 5, whereas if the SrO and BaO are substantially equal then the total alkaline earth content does not exceed 28 per cent. PbO, ZnO, and F are preferably absent, but F, preferably in the form of cryolite or fluorspar, may be added to produce a very fluid glass for casting. Preferably Na 2 O is used as the alkali oxide, but a little Li 2 O may be present. Al 2 O 3 is not deliberately included, but 0.5-2 per cent may be derived from the container. The glasses have high electrical resistance, and may be used to form glass / metal seals in forming the envelopes of electrical devices. The composition and properties of several examples are given, and a comparison made with a typical soft glass.
GB2300550A 1950-09-19 1950-09-19 Improvements in or relating to glass compositions and glass-metal seals Expired GB691870A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2300550A GB691870A (en) 1950-09-19 1950-09-19 Improvements in or relating to glass compositions and glass-metal seals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2300550A GB691870A (en) 1950-09-19 1950-09-19 Improvements in or relating to glass compositions and glass-metal seals

Publications (1)

Publication Number Publication Date
GB691870A true GB691870A (en) 1953-05-20

Family

ID=10188564

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2300550A Expired GB691870A (en) 1950-09-19 1950-09-19 Improvements in or relating to glass compositions and glass-metal seals

Country Status (1)

Country Link
GB (1) GB691870A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1096002B (en) * 1957-02-21 1960-12-29 Gen Electric Co Ltd Glass and method of producing a glass-to-metal fusion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1096002B (en) * 1957-02-21 1960-12-29 Gen Electric Co Ltd Glass and method of producing a glass-to-metal fusion

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