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FR2312004A1 - High temp. laboratory furnace - using graphite heating elements in separate refractory tubes under protective gas - Google Patents

High temp. laboratory furnace - using graphite heating elements in separate refractory tubes under protective gas

Info

Publication number
FR2312004A1
FR2312004A1 FR7513583A FR7513583A FR2312004A1 FR 2312004 A1 FR2312004 A1 FR 2312004A1 FR 7513583 A FR7513583 A FR 7513583A FR 7513583 A FR7513583 A FR 7513583A FR 2312004 A1 FR2312004 A1 FR 2312004A1
Authority
FR
France
Prior art keywords
furnace
heating elements
high temp
protective gas
heating element
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.)
Granted
Application number
FR7513583A
Other languages
French (fr)
Other versions
FR2312004B1 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7513583A priority Critical patent/FR2312004A1/en
Publication of FR2312004A1 publication Critical patent/FR2312004A1/en
Application granted granted Critical
Publication of FR2312004B1 publication Critical patent/FR2312004B1/fr
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/029—Furnaces therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/62—Heating means for drawing
    • C03B2205/64—Induction furnaces, i.e. HF/RF coil, e.g. of the graphite or zirconia susceptor type

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)

Abstract

Electric furnace capable of reacting temp. =2500 degrees C comprises a furnace chamber in which is located >=1 separate chambers made of heat conducting refractory material, each enclosing a heating element. The separate chambers are not completely hermetically sealed, but are sealed against penetration by gas from below and from the sides both wrt. to the furnace chamber and the exterior air. The chambers are filled during operation of the furnace with a gas heavier than air and mixt. even at high temp. wrt. the constructional materials and material of the heating element. Specifically, the heating element is graphite and the heavy gas ic CO2, Ar etc. The furnace is used for making optical fibres from materials having a high acticis content. The furnace chamber may contain an atmosphere selected or desired, while problems associated with protection of the heating elements are reduced.
FR7513583A 1975-04-30 1975-04-30 High temp. laboratory furnace - using graphite heating elements in separate refractory tubes under protective gas Granted FR2312004A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7513583A FR2312004A1 (en) 1975-04-30 1975-04-30 High temp. laboratory furnace - using graphite heating elements in separate refractory tubes under protective gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7513583A FR2312004A1 (en) 1975-04-30 1975-04-30 High temp. laboratory furnace - using graphite heating elements in separate refractory tubes under protective gas

Publications (2)

Publication Number Publication Date
FR2312004A1 true FR2312004A1 (en) 1976-12-17
FR2312004B1 FR2312004B1 (en) 1978-12-15

Family

ID=9154679

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7513583A Granted FR2312004A1 (en) 1975-04-30 1975-04-30 High temp. laboratory furnace - using graphite heating elements in separate refractory tubes under protective gas

Country Status (1)

Country Link
FR (1) FR2312004A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2387564A1 (en) * 1977-04-13 1978-11-10 Alkem Gmbh Radiant heating element heated by induction - is carbon or graphite crucible for high temperature laboratory kiln
FR2401103A1 (en) * 1977-04-30 1979-03-23 Sumitomo Electric Industries METHOD AND APPARATUS FOR THE PRODUCTION OF OPTICAL TRANSMISSION FIBERS
FR2627048A1 (en) * 1988-02-10 1989-08-11 Electricite De France Vessel for the induction heating of a liquid
EP1018491A1 (en) * 1999-01-08 2000-07-12 Alcatel Method for drawing a fibre

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB279818A (en) * 1926-10-27 1928-09-13 Henri George
FR1011429A (en) * 1949-02-07 1952-06-23 electric heating element for melting furnaces
DE867116C (en) * 1939-06-09 1953-02-16 Degussa Annealing furnace for maximum temperatures, preferably over 1400 ° C, with electrical resistance heating
US2635125A (en) * 1949-09-30 1953-04-14 American Optical Corp Glass induction furnace
FR2033306A1 (en) * 1969-02-06 1970-12-04 Nippon Selfoc Co Ltd

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB279818A (en) * 1926-10-27 1928-09-13 Henri George
DE867116C (en) * 1939-06-09 1953-02-16 Degussa Annealing furnace for maximum temperatures, preferably over 1400 ° C, with electrical resistance heating
FR1011429A (en) * 1949-02-07 1952-06-23 electric heating element for melting furnaces
US2635125A (en) * 1949-09-30 1953-04-14 American Optical Corp Glass induction furnace
FR2033306A1 (en) * 1969-02-06 1970-12-04 Nippon Selfoc Co Ltd

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2387564A1 (en) * 1977-04-13 1978-11-10 Alkem Gmbh Radiant heating element heated by induction - is carbon or graphite crucible for high temperature laboratory kiln
FR2401103A1 (en) * 1977-04-30 1979-03-23 Sumitomo Electric Industries METHOD AND APPARATUS FOR THE PRODUCTION OF OPTICAL TRANSMISSION FIBERS
FR2627048A1 (en) * 1988-02-10 1989-08-11 Electricite De France Vessel for the induction heating of a liquid
EP1018491A1 (en) * 1999-01-08 2000-07-12 Alcatel Method for drawing a fibre
US6658897B2 (en) 1999-01-08 2003-12-09 Alcatel Optical fiber draw furnace having a SiC or Silicon Nitride tube

Also Published As

Publication number Publication date
FR2312004B1 (en) 1978-12-15

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Legal Events

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TP Transmission of property
CL Concession to grant licenses
TP Transmission of property