GB610864A - Improvements in or relating to a method of manufacturing filaments from tungsten - Google Patents

Improvements in or relating to a method of manufacturing filaments from tungsten

Info

Publication number
GB610864A
GB610864A GB11779/46A GB1177946A GB610864A GB 610864 A GB610864 A GB 610864A GB 11779/46 A GB11779/46 A GB 11779/46A GB 1177946 A GB1177946 A GB 1177946A GB 610864 A GB610864 A GB 610864A
Authority
GB
United Kingdom
Prior art keywords
filaments
coil
recrystallization
filament
tungsten
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
GB11779/46A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB610864A publication Critical patent/GB610864A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/02—Manufacture of incandescent bodies

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Resistance Heating (AREA)

Abstract

In a method of manufacturing single or multiple-coil recrystallized filaments from tungsten wire having an average crystal size of at least one turn of a single coil or, in the case of multiple-coil filaments, of a primary coil, the filament, prior to recrystallization is subjected, without a mandrel and either within or outside of an incandescent lamp, to a temperature between 1500 and 2000 DEG C. for at least 5 minutes to produce a far-advanced lattice recovery. The filament, the wire of which may contain 0.05 to 0.1 per cent of iron, may be heated to 1850 DEG C. for from 5 to 120 minutes. A formula is given correlating lattice recovery, time and temperature, and the heating should be such that recrystallization just does not occur. Recrystallization is produced later by heating in a tungsten furnace to 2400 DEG C. or the filament may be mounted in a lamp and burned. It is stated that filaments heated in this manner have a high resistance to vibration.
GB11779/46A 1941-10-28 1946-04-17 Improvements in or relating to a method of manufacturing filaments from tungsten Expired GB610864A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL241778X 1941-10-28

Publications (1)

Publication Number Publication Date
GB610864A true GB610864A (en) 1948-10-21

Family

ID=19780600

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11779/46A Expired GB610864A (en) 1941-10-28 1946-04-17 Improvements in or relating to a method of manufacturing filaments from tungsten

Country Status (2)

Country Link
CH (1) CH241778A (en)
GB (1) GB610864A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1182690A1 (en) * 2000-08-23 2002-02-27 General Electric Company Method of dimensionally stabilizing a tungsten filament
WO2005059950A2 (en) * 2003-12-16 2005-06-30 Koninklijke Philips Electronics N.V. Electric incandescent lamp and method for fabrication thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1182690A1 (en) * 2000-08-23 2002-02-27 General Electric Company Method of dimensionally stabilizing a tungsten filament
US6669523B1 (en) 2000-08-23 2003-12-30 General Electric Company Method of dimensionally stabilizing a tungsten filament
WO2005059950A2 (en) * 2003-12-16 2005-06-30 Koninklijke Philips Electronics N.V. Electric incandescent lamp and method for fabrication thereof
WO2005059950A3 (en) * 2003-12-16 2007-06-14 Koninkl Philips Electronics Nv Electric incandescent lamp and method for fabrication thereof

Also Published As

Publication number Publication date
CH241778A (en) 1946-03-31

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