US3588307A - Hollow carbon electrode - Google Patents

Hollow carbon electrode Download PDF

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Publication number
US3588307A
US3588307A US833841A US3588307DA US3588307A US 3588307 A US3588307 A US 3588307A US 833841 A US833841 A US 833841A US 3588307D A US3588307D A US 3588307DA US 3588307 A US3588307 A US 3588307A
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US
United States
Prior art keywords
electrode
sealed
hollow
substances
gas
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 - Lifetime
Application number
US833841A
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English (en)
Inventor
Kurt Kegel
Dieter Zollner
Bernhard Reichelt
Konrad Koziol
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.)
C Conradty Nuernberg GmbH and Co KG
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
Priority claimed from DE19681758394 external-priority patent/DE1758394C3/de
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3588307A publication Critical patent/US3588307A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/06—Electrodes
    • H05B7/08—Electrodes non-consumable
    • H05B7/085—Electrodes non-consumable mainly consisting of carbon

Definitions

  • FIGA HOLLOW CARBON ELECTRODE In electrothermal processes, especially in connection with the production of electrosteel, it is known to employ hollow or wick electrodes because the annular design of the electrode ends stabilizes the electric arc.
  • an object of the present invention to provide a hollow carbon electrode (the term also includes graphite) which will eliminate the loss of ionizing gases.
  • FIG. I diagrammatically illustrates a hollow or tubular carbon electrode having its interior wall surface sealed in conformity with the present invention.
  • FIG. 2 is an enlargement of an interior portion of an electrode according to the invention in which the inner wall of the graphite electrode is made gas-impermeable by SiO
  • FIG. 3 shows a cutoutof the interior portion of a graphite electrode having its interior wall surface made gas-impermeable by a metallic coating.
  • FIG. 4 is a further embodiment of the invention according to which a tubular graphite electrode has its interior wall surface sealed by a metallic tube firmly pressed thereinto.
  • the hollow electrode of carbon material according to the present invention for the introduction of gases for the stabilization of the electric arc is characterized primarily in that the inner wall surface is sealed or made gas-impermeable.
  • the inner surface 1 of the tubular electrode 2 is sealed with substances 3 which during a thermal treatment under the exclusion of air will coke while having properties similar to those of the electrode material.
  • substances 3 are well known in connection with impregnating methods for carbon or graphite material and such substances are in particular tar and tar products, such as pitch, and also synthetic resins, sugar solution, water glass solution, or the like.
  • tar and tar products such as pitch
  • synthetic resins such as sugar solution, water glass solution, or the like.
  • a filling of the pores with silicic acid will increase the desired effect.
  • the said substances are caused to penetrate into the electrode body to a greater or lesser extent.
  • FIGS. 1 and 2 Particularly effective as far as the sealing of the inner surface I ofthe hollow electrode is concerned, is the formation of pyrolytic carbon from the gaseous phase.
  • the inner wall surface of the electrode 2 is covered by a metal pipe 5 which is firmly pressed into the bore of the electrode.
  • the metal pipe may also be replaced by a pipe of carbon material which has been sealed prior to its insertion into the electrode.
  • a hollow electrode of carbon material for the introduction of gases for stabilizing the electric are, which has a longitudinal passage therethrough, and in which the inner wall of the electrode body is sealed so as to make the same substantially gas-impermeable, there being a means to supply gas and direct it through the electrode rendered gas impervious.
  • An electrode according to claim 1 in which the inner surface of the electrode is sealed by substances adapted to be coked, said substances being selected from the group consisting of tar, pitch, synthetic resin and sugar solution.
  • An electrode according to claim 1 in which the pores on the inside of the electrode are sealed by silicic acid and the inner surface of the electrode is covered by water glass solutron.
  • An electrode according to claim 1 in which the inner surface of the electrode is coated with a fire resistant material.
  • An electrode according to claim I in which the inner surface of the electrode is sealed by the formation of pyrolytic carbon from the gas phase.
  • An electrode according to claim 5 in which as pyrolytic carbon material is used a substance selected from the group consisting of hard carbon and pyrographite.
  • An electrode according to claim 1 in which the sealed inner surface of the electrode contains substances adapted to stabilize the electric are, said substances consisting of ionizing material selected from the group consisting of KBE, K 80 WC, TiC.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Heating (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Sealing Devices (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
US833841A 1968-05-24 1969-05-19 Hollow carbon electrode Expired - Lifetime US3588307A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681758394 DE1758394C3 (de) 1968-05-24 Hohlelektrode aus Kohle oder Graphit

Publications (1)

Publication Number Publication Date
US3588307A true US3588307A (en) 1971-06-28

Family

ID=5695010

Family Applications (1)

Application Number Title Priority Date Filing Date
US833841A Expired - Lifetime US3588307A (en) 1968-05-24 1969-05-19 Hollow carbon electrode

Country Status (11)

Country Link
US (1) US3588307A (fr)
AT (1) AT290868B (fr)
BE (1) BE731748A (fr)
CH (1) CH535527A (fr)
ES (1) ES365395A1 (fr)
FR (1) FR2014138B1 (fr)
GB (1) GB1271681A (fr)
LU (1) LU58225A1 (fr)
NL (1) NL6905619A (fr)
NO (1) NO122441B (fr)
SE (1) SE350983B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490824A (en) * 1983-07-15 1984-12-25 Great Lakes Carbon Corporation Composite electrode for arc furnace
WO1985000722A1 (fr) * 1983-07-15 1985-02-14 Great Lakes Carbon Corporation Electrode composite pour fours a arc

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490824A (en) * 1983-07-15 1984-12-25 Great Lakes Carbon Corporation Composite electrode for arc furnace
WO1985000721A1 (fr) * 1983-07-15 1985-02-14 Great Lakes Carbon Corporation Electrode composite pour fours a arc
WO1985000722A1 (fr) * 1983-07-15 1985-02-14 Great Lakes Carbon Corporation Electrode composite pour fours a arc
US4513425A (en) * 1983-07-15 1985-04-23 Great Lakes Carbon Corporation Composite electrode for arc furnace

Also Published As

Publication number Publication date
AT290868B (de) 1971-06-25
BE731748A (fr) 1969-10-01
DE1758394A1 (de) 1971-01-28
SE350983B (fr) 1972-11-13
DE1758394B2 (de) 1976-01-08
ES365395A1 (es) 1971-01-01
NO122441B (fr) 1971-06-28
LU58225A1 (fr) 1969-07-11
CH535527A (de) 1973-03-31
GB1271681A (en) 1972-04-26
FR2014138B1 (fr) 1975-08-22
NL6905619A (fr) 1969-11-26
FR2014138A1 (fr) 1970-04-17

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