GB1034122A - Improvements in or relating to electrical devices having envelopes formed at least in part of sintered polycrystalline alumina - Google Patents

Improvements in or relating to electrical devices having envelopes formed at least in part of sintered polycrystalline alumina

Info

Publication number
GB1034122A
GB1034122A GB1035063A GB1035063A GB1034122A GB 1034122 A GB1034122 A GB 1034122A GB 1035063 A GB1035063 A GB 1035063A GB 1035063 A GB1035063 A GB 1035063A GB 1034122 A GB1034122 A GB 1034122A
Authority
GB
United Kingdom
Prior art keywords
alumina
relating
electrical devices
flux
heating
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
GB1035063A
Inventor
Sydney Alfred Richard Rigden
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 GB1035063A priority Critical patent/GB1034122A/en
Publication of GB1034122A publication Critical patent/GB1034122A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/04—Vessels or containers characterised by the material thereof

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

A discharge tube envelope formed of a translucent mass of polycrystalline sintered alumina has at least one surface provided with a light-transmissive fused layer of a refractory oxide effectively sealing the surface against the passage of gas or vapour therethrough. The layer may be formed by heating the alumina surface to its melting-point of about 2050 DEG C. with high-intensity hydrogen/oxygen flames, or by applying to the surface a flux such as magnesium oxide or calcium oxide capable of forming by itself, or in combination with the alumina, a fused layer on heating to an appropriate temperature.ALSO:The inner and/or outer surface of a discharge tube of translucent polycrystalline sintered alumina is flame polished and converted to monocrystalline form by means of a high intensity hydrogen-oxygen flame, optionally with the aid of a flux.
GB1035063A 1963-03-15 1963-03-15 Improvements in or relating to electrical devices having envelopes formed at least in part of sintered polycrystalline alumina Expired GB1034122A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1035063A GB1034122A (en) 1963-03-15 1963-03-15 Improvements in or relating to electrical devices having envelopes formed at least in part of sintered polycrystalline alumina

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1035063A GB1034122A (en) 1963-03-15 1963-03-15 Improvements in or relating to electrical devices having envelopes formed at least in part of sintered polycrystalline alumina

Publications (1)

Publication Number Publication Date
GB1034122A true GB1034122A (en) 1966-06-29

Family

ID=9966228

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1035063A Expired GB1034122A (en) 1963-03-15 1963-03-15 Improvements in or relating to electrical devices having envelopes formed at least in part of sintered polycrystalline alumina

Country Status (1)

Country Link
GB (1) GB1034122A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935495A (en) * 1974-03-22 1976-01-27 General Electric Company Chemically polished polycrystalline alumina material
US4033743A (en) 1974-03-22 1977-07-05 General Electric Company Chemically polished polycrystalline alumina material
US4047067A (en) * 1974-06-05 1977-09-06 General Electric Company Sodium halide discharge lamp with an alumina silicate barrier zone in fused silica envelope
EP0132886A1 (en) * 1983-07-25 1985-02-13 Koninklijke Philips Electronics N.V. Discharge lamp

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935495A (en) * 1974-03-22 1976-01-27 General Electric Company Chemically polished polycrystalline alumina material
US4033743A (en) 1974-03-22 1977-07-05 General Electric Company Chemically polished polycrystalline alumina material
US4079167A (en) 1974-03-22 1978-03-14 General Electric Company Chemically polished polycrystalline alumina material
US4047067A (en) * 1974-06-05 1977-09-06 General Electric Company Sodium halide discharge lamp with an alumina silicate barrier zone in fused silica envelope
EP0132886A1 (en) * 1983-07-25 1985-02-13 Koninklijke Philips Electronics N.V. Discharge lamp

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