US3676371A - High output electrode with stabilized electric arc - Google Patents
High output electrode with stabilized electric arc Download PDFInfo
- Publication number
- US3676371A US3676371A US7235A US3676371DA US3676371A US 3676371 A US3676371 A US 3676371A US 7235 A US7235 A US 7235A US 3676371D A US3676371D A US 3676371DA US 3676371 A US3676371 A US 3676371A
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- Prior art keywords
- electrode
- titanium
- high output
- electric arc
- graphite
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- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
Definitions
- ABSTRACT [30] Foreign Ap lication P i rit D t A high output electrode of carbon or graphite and method of making same, according to which the electrode has incor- Jan. 30, Germany ..P o t d th in a tita iun boron ombination o without carbides, said titanium-boron combination preferably containlll ..252/507 ing at least one f the Compounds and '53,, n [58] Field of Search ..252/507, 504, 503 1 Claim, No Drawings The high output operation of electric arc furnaces during which transformer outputs of approximately from 400 to 500 kVA/t are employed require graphite electrodes of high power transmitting ability.
- the electric conductivity of the graphite material had, similar to the thermal shock resistance and the oxidation resistance, to be adapted to the increasing current densities and temperature loads. This was done by employing oil cokes of ever higher grade and very good graphitizing behavior, of higher graphitizing temperatures and additional pitch impregnation which require an additional fumace process for the ordinary finishing step for a post-coking. All of these steps are expensive and raise the costs of the manufacturing process of the electrode. In addition thereto, the impregnation of the electrode, which is necessary for lowering the specific electric resistance of the graphite material, frequently brings about an increased liability to form tears in the graphite electrode or to decrease the resistance of the electrode to breaking.
- an object of the present invention to provide means for increasing the electric load of the electrode and for reducing its liability to oxidation, while maintaining its resistance against tears.
- the finished graphite electrodes will contain titanium borides which will bring about a considerable reduction in the electric resistance of the electrode while increasing the resistance of the electrode against oxidation and while stabilizing the light are when the electrode is being used in the electric arc furnace.
- the titanium borides may be added already directly to the mixture of the raw material which mixture customarily consists of a granular mixture of oil coke, tar and pitch. The said titanium borides will, while unchanged during the manufacturing process of the electrode, become effective only when the electrode is used in the electric arc furnace.
- titanium monoboride TiB titanium monoboride TiB
- TiB titanium diboride TiB
- the titanium is able to absorb considerable quantifies of boron in solid solution so that also this type has the advantages inherent to the present invention.
- a certain proportion of titanium carbide which may form during the graphitizing process at boundary surface reactions of the added particles with the carbon or graphite will have no disturbing or interfering influence.
- the total content in titanium-boron compounds may amount to 20 percent, but preferably will be from 1 to 8 percent.
- the introduction of the borides into the graphite electrode may be effected in difierent ways, namely:
- reaction components By impregnating reaction components and introducing the same into the boron electrode prior to graphitizing the latter.
- the titanium boron compounds will then form during the graphitizing process from a temperature of.
- titaniumboron-alloys titanium monoboride and titanium diboride may be employed.
- TiO and B 0 may be admixed to the electrode raw mixture, and in this instance during the graphitizing process there will be obtained TiO +B O +5 CTiB +5 CO, or 8 C, titanium and B o are added in which instance during the graphitizing process the following reaction is obtained 7Ti+3 B C+B O 7TiB+3 CO.
- titanium components and boron components into an already burned electrode may be effected also by impregnation with titanium silicon compounds and boron organic compounds in organic solution with a subsequent dilution of the solution, for instance, by humidification so that a disintegration of such organic compounds will occur.
- Such disintegration may also be carried out in a purely thermal way.
- EXAMPLE I 7% by weight of oil coke with a granular size of from 4 to 8 mm 14% by weight of oil coke with a granular size of from 2 to 4 mm 18% by weight of oil coke with a granular size of from 0.5 to 2 mm 53.5% by weight of oil coke with a granular size of less than 0.5 mm 4% by weight of TiO dust with a granular size of less than 0.1 mm 3.5% by weight of B 0 with a granular size of less than 0.5 mm
- the thus obtained product was then further processed in a manner customary with the manufacture of carbon or graphite electrodes, i.e., by mixing, pressing, glowing and graphetizing.
- the thus obtained product was then further processed in a manner customary with the manufacture of carbon or graphite electrodes, by mixing, pressing, glowing, and graphetizing, which steps have no harmful effect upon the stabilizing effect of TiO Electrodes produced in conformity with the present invention can absorb a considerably higher electric load, have a higher resistance against oxidation and are characterized by a great stability of the light arc, which is in contrast to normal carbon or graphite electrodes.
- Example I TiO 2 dust with a granular size of less than 0.1 mm has been mentioned, the granular size of TiO, may advantageously be less than 60/],000 mm.
- a high output electrode of carbon material especially carbon electrode and graphite electrode, which includes a titanium-boron combination consisting of at least one of the compounds TiB and TiB of from 1 to 8 percent to thereby improve the oxidation resistance, electrical load ability, and electric arc stability for light are furnace means used in steel making and a remaining part of the electrode amounting to percent and more consists of graphite.
Abstract
A high output electrode of carbon or graphite and method of making same, according to which the electrode has incorporated therein a titanium-boron combination with or without carbides, said titanium-boron combination preferably containing at least one of the compounds TiB and TiB2.
Description
United States Patent Zollner et al. [4 1 July 11, 1972 [54] HIGH OUTPUT ELECTRODE WITH STABILIZED ELECTRIC ARC References Cited [72] Inventors: Dieter Zollner, Erlangen; Konrad Koziol, UNITED STATES PATENTS gz f f gfi 5222 8 3323 fi' g 3,174,872 3/1965 Fisher et al. ..252/507 schwabach a" of Gennany gang 1,024,257 4/1912 Harden ....2s2/s04 3,065,088 11/1962 Janes et al. ..252/504 [73] Assignee: C. Conradty, Numberg, Germany 22 Filed: Jan. 30, 1970 E 222? Drum'mnd [2]] Appl. No; 7,235
[57] ABSTRACT [30] Foreign Ap lication P i rit D t A high output electrode of carbon or graphite and method of making same, according to which the electrode has incor- Jan. 30, Germany ..P o t d th in a tita iun boron ombination o without carbides, said titanium-boron combination preferably containlll ..252/507 ing at least one f the Compounds and '53,, n [58] Field of Search ..252/507, 504, 503 1 Claim, No Drawings The high output operation of electric arc furnaces during which transformer outputs of approximately from 400 to 500 kVA/t are employed require graphite electrodes of high power transmitting ability. The electric conductivity of the graphite material had, similar to the thermal shock resistance and the oxidation resistance, to be adapted to the increasing current densities and temperature loads. This was done by employing oil cokes of ever higher grade and very good graphitizing behavior, of higher graphitizing temperatures and additional pitch impregnation which require an additional fumace process for the ordinary finishing step for a post-coking. All of these steps are expensive and raise the costs of the manufacturing process of the electrode. In addition thereto, the impregnation of the electrode, which is necessary for lowering the specific electric resistance of the graphite material, frequently brings about an increased liability to form tears in the graphite electrode or to decrease the resistance of the electrode to breaking.
Of great importance in this connection for an economic operation of the high output electric arc furnace is an as uniform as possible current withdrawal from the supply network without any special reaction by the network. Due to the operation with relatively short light arc, it is possible to reduce the flickering, but it is not possible completely to eliminate the same. Moreover, when operating the light are at a low voltage and high current intensity, a greater wear of the tip of the electrode takes place than is the case in the reversed instance. Therefore, attempts have been made to cause the arc to burn in a more stable manner by the employment of hollow electrodes with and without the supply of gases stabilizing the arc. These attempts have been successful. This method, however, has the drawback that it requires a drilled or very dense electrode which at any rate is more expensive than the heretofore customary solid electrode. When operating with gases, additional costs are incurred which could not be justified in spite of the metallurgical advantages of this method.
It is, therefore, an object of the present invention to provide means for increasing the electric load of the electrode and for reducing its liability to oxidation, while maintaining its resistance against tears.
It is also an object of the present invention to provide means for stabilizing the light arc in order to eliminate the flickering for all practical purposes.
These and other objects and advantages of the invention will appear more clearly from the following specification.
By the addition of or impregnation with suitable substances during the manufacturing process of the graphite electrode, the finished graphite electrodes will contain titanium borides which will bring about a considerable reduction in the electric resistance of the electrode while increasing the resistance of the electrode against oxidation and while stabilizing the light are when the electrode is being used in the electric arc furnace. The titanium borides may be added already directly to the mixture of the raw material which mixture customarily consists of a granular mixture of oil coke, tar and pitch. The said titanium borides will, while unchanged during the manufacturing process of the electrode, become effective only when the electrode is used in the electric arc furnace.
Two borides of the titanium are known, namely titanium monoboride TiB, and thetitanium diboride TiB In addition thereto, the titanium is able to absorb considerable quantifies of boron in solid solution so that also this type has the advantages inherent to the present invention. A certain proportion of titanium carbide which may form during the graphitizing process at boundary surface reactions of the added particles with the carbon or graphite will have no disturbing or interfering influence. The total content in titanium-boron compounds may amount to 20 percent, but preferably will be from 1 to 8 percent.
The introduction of the borides into the graphite electrode may be effected in difierent ways, namely:
1. By admixing reaction components to the starting material during the finishing process.
2. By impregnating reaction components and introducing the same into the boron electrode prior to graphitizing the latter. The titanium boron compounds will then form during the graphitizing process from a temperature of.
l,300 C. upwards.
3. By admixing titanium borides to the starting mixture. This method may also be applied with the electrodes which are still to be graphitized. This method is particularly advantageous with carbon electrodes which are not to be graphitized as they are employed, for instance, in connection with the are air method (Fugenhobelverfahren). Also in this instance the same problems are encountered as with large electrodes in the electric arc furnace. The extreme high current intensities which are employed with this cutting-blowing-method require increasing electric conductivity and a higher resistance against oxidation. In view of the stabilization of the electric light arc, a more favorable working condition can be obtained.
With the admixture to the completed electrode, titaniumboron-alloys, titanium monoboride and titanium diboride may be employed.
When admixing the reaction components, there exists the possibility of varying the admixture in conformity with the expected or desired reactions. Thus, for instance, TiO and B 0 may be admixed to the electrode raw mixture, and in this instance during the graphitizing process there will be obtained TiO +B O +5 CTiB +5 CO, or 8 C, titanium and B o are added in which instance during the graphitizing process the following reaction is obtained 7Ti+3 B C+B O 7TiB+3 CO. These methods may serve as examples.
The introduction of titanium components and boron components into an already burned electrode may be effected also by impregnation with titanium silicon compounds and boron organic compounds in organic solution with a subsequent dilution of the solution, for instance, by humidification so that a disintegration of such organic compounds will occur. Such disintegration may also be carried out in a purely thermal way.
There may now be set forth two examples for preparing the mixture for an electrode according to the invention.
EXAMPLE I 7% by weight of oil coke with a granular size of from 4 to 8 mm 14% by weight of oil coke with a granular size of from 2 to 4 mm 18% by weight of oil coke with a granular size of from 0.5 to 2 mm 53.5% by weight of oil coke with a granular size of less than 0.5 mm 4% by weight of TiO dust with a granular size of less than 0.1 mm 3.5% by weight of B 0 with a granular size of less than 0.5 mm To the above mentioned dry starting mixture there were added 25 percent by weight of pitch with a softening or fusion point of 82 C.
The thus obtained product was then further processed in a manner customary with the manufacture of carbon or graphite electrodes, i.e., by mixing, pressing, glowing and graphetizing.
EXAMPLE [I 26.5% by weight of oil coke with a granular size of from 4 to 8 232% by weight of oil coke with a granular size of from 2 to 4 3 3% by weight of oil coke with a granular size of from 0.5 to
25 7 by weight of oil coke with a granular size of less than 0.5
57 by weight of TiB, dust with a granular size of less than To the above mentioned starting mixture there was added 23.5 percent by weight of pitch or insulating asphalt with a softening or fusion point of 82 C.
The thus obtained product was then further processed in a manner customary with the manufacture of carbon or graphite electrodes, by mixing, pressing, glowing, and graphetizing, which steps have no harmful effect upon the stabilizing effect of TiO Electrodes produced in conformity with the present invention can absorb a considerably higher electric load, have a higher resistance against oxidation and are characterized by a great stability of the light arc, which is in contrast to normal carbon or graphite electrodes.
It is, of course, to be understood that the present invention is, by no means, limited to the particular examples set forth above but also comprises any modifications within the scope of the appended claims. Thus, while e.g., in Example I TiO, 2 dust with a granular size of less than 0.1 mm has been mentioned, the granular size of TiO, may advantageously be less than 60/],000 mm.
What we claim is:
1. A high output electrode of carbon material, especially carbon electrode and graphite electrode, which includes a titanium-boron combination consisting of at least one of the compounds TiB and TiB of from 1 to 8 percent to thereby improve the oxidation resistance, electrical load ability, and electric arc stability for light are furnace means used in steel making and a remaining part of the electrode amounting to percent and more consists of graphite.
t a: a: a a
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19691904408 DE1904408A1 (en) | 1969-01-30 | 1969-01-30 | High performance electrode with stabilized arc |
Publications (1)
Publication Number | Publication Date |
---|---|
US3676371A true US3676371A (en) | 1972-07-11 |
Family
ID=5723716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US7235A Expired - Lifetime US3676371A (en) | 1969-01-30 | 1970-01-30 | High output electrode with stabilized electric arc |
Country Status (13)
Country | Link |
---|---|
US (1) | US3676371A (en) |
AT (1) | AT298087B (en) |
BE (1) | BE745161A (en) |
CA (1) | CA922384A (en) |
CH (1) | CH544474A (en) |
DE (1) | DE1904408A1 (en) |
ES (1) | ES374541A1 (en) |
FI (1) | FI50577C (en) |
FR (1) | FR2029694A1 (en) |
GB (1) | GB1283562A (en) |
LU (1) | LU60219A1 (en) |
NO (1) | NO124752B (en) |
SE (1) | SE346197B (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4161433A (en) * | 1977-12-05 | 1979-07-17 | Oronzio De Nora Impianti Elettrochimici S.P.A. | Decomposition of alkali metal amalgams |
WO1982001018A1 (en) * | 1980-09-11 | 1982-04-01 | Lakes Carbon Corp Great | Titanium diboride-graphite composites |
EP0084059A1 (en) * | 1981-07-27 | 1983-07-27 | Great Lakes Carbon Corporation | Composite of tib2-graphite |
US4465581A (en) * | 1981-07-27 | 1984-08-14 | Great Lakes Carbon Corporation | Composite of TiB2 -graphite |
US6376977B1 (en) * | 1999-06-08 | 2002-04-23 | Shin-Etsu Chemical Co., Ltd. | Silicon electrode plate |
WO2004046262A2 (en) * | 2002-11-15 | 2004-06-03 | University Of Utah | Integral titanium boride coatings on titanium surfaces and associated methods |
US20070018139A1 (en) * | 2005-05-10 | 2007-01-25 | Chandran K S R | Nanostructured titanium monoboride monolithic material and associated methods |
US20080048154A1 (en) * | 2003-09-20 | 2008-02-28 | Djamschid Amirzadeh-Asl | Method for Improving the Durability of Carbon or Graphite Electrodes by Using Tio2 -Containing Products |
US20100176339A1 (en) * | 2009-01-12 | 2010-07-15 | Chandran K S Ravi | Jewelry having titanium boride compounds and methods of making the same |
US8211278B2 (en) | 2009-07-28 | 2012-07-03 | Alcoa Inc. | Composition for making wettable cathode in aluminum smelting |
CN102822392A (en) * | 2010-03-30 | 2012-12-12 | 日本电极株式会社 | Cathode carbon block for aluminum smelting purposes, and process for production thereof |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58501172A (en) * | 1981-07-27 | 1983-07-21 | グレ−ト レ−クス カ−ボン コ−ポレ−シヨン | Sintered refractory hard metal |
US4439382A (en) * | 1981-07-27 | 1984-03-27 | Great Lakes Carbon Corporation | Titanium diboride-graphite composites |
US4377463A (en) | 1981-07-27 | 1983-03-22 | Great Lakes Carbon Corporation | Controlled atmosphere processing of TiB2 /carbon composites |
DE3380551D1 (en) * | 1982-11-19 | 1989-10-12 | Union Carbide Corp | Method of making graphite electrodes |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1024257A (en) * | 1905-04-27 | 1912-04-23 | Gen Electric | Electrode. |
US3065088A (en) * | 1959-09-30 | 1962-11-20 | Union Carbide Corp | Oxidation-resistant graphite article and method |
US3174872A (en) * | 1963-01-08 | 1965-03-23 | Union Carbide Corp | Oxidation resistant carbon refractory articles |
-
1969
- 1969-01-30 DE DE19691904408 patent/DE1904408A1/en active Pending
- 1969-10-21 CH CH1571869A patent/CH544474A/en not_active IP Right Cessation
- 1969-11-19 SE SE15903/69A patent/SE346197B/xx unknown
- 1969-12-03 FI FI693499A patent/FI50577C/en active
- 1969-12-12 GB GB60666/69A patent/GB1283562A/en not_active Expired
- 1969-12-13 ES ES374541A patent/ES374541A1/en not_active Expired
- 1969-12-20 NO NO5057/69A patent/NO124752B/no unknown
-
1970
- 1970-01-20 AT AT49470A patent/AT298087B/en active
- 1970-01-22 LU LU60219D patent/LU60219A1/xx unknown
- 1970-01-29 FR FR7003069A patent/FR2029694A1/fr not_active Withdrawn
- 1970-01-29 BE BE745161D patent/BE745161A/en unknown
- 1970-01-30 CA CA073509A patent/CA922384A/en not_active Expired
- 1970-01-30 US US7235A patent/US3676371A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1024257A (en) * | 1905-04-27 | 1912-04-23 | Gen Electric | Electrode. |
US3065088A (en) * | 1959-09-30 | 1962-11-20 | Union Carbide Corp | Oxidation-resistant graphite article and method |
US3174872A (en) * | 1963-01-08 | 1965-03-23 | Union Carbide Corp | Oxidation resistant carbon refractory articles |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4161433A (en) * | 1977-12-05 | 1979-07-17 | Oronzio De Nora Impianti Elettrochimici S.P.A. | Decomposition of alkali metal amalgams |
WO1982001018A1 (en) * | 1980-09-11 | 1982-04-01 | Lakes Carbon Corp Great | Titanium diboride-graphite composites |
US4376029A (en) * | 1980-09-11 | 1983-03-08 | Great Lakes Carbon Corporation | Titanium diboride-graphite composits |
EP0084059A1 (en) * | 1981-07-27 | 1983-07-27 | Great Lakes Carbon Corporation | Composite of tib2-graphite |
EP0084059A4 (en) * | 1981-07-27 | 1984-05-17 | Great Lakes Carbon Corp | Composite of tib2-graphite. |
US4465581A (en) * | 1981-07-27 | 1984-08-14 | Great Lakes Carbon Corporation | Composite of TiB2 -graphite |
US6376977B1 (en) * | 1999-06-08 | 2002-04-23 | Shin-Etsu Chemical Co., Ltd. | Silicon electrode plate |
WO2004046262A2 (en) * | 2002-11-15 | 2004-06-03 | University Of Utah | Integral titanium boride coatings on titanium surfaces and associated methods |
WO2004046262A3 (en) * | 2002-11-15 | 2004-08-05 | Univ Utah | Integral titanium boride coatings on titanium surfaces and associated methods |
US20050208213A1 (en) * | 2002-11-15 | 2005-09-22 | University Of Utah Research Foundation | Titanium boride coatings on titanium surfaces and associated methods |
US7264682B2 (en) | 2002-11-15 | 2007-09-04 | University Of Utah Research Foundation | Titanium boride coatings on titanium surfaces and associated methods |
US20080048154A1 (en) * | 2003-09-20 | 2008-02-28 | Djamschid Amirzadeh-Asl | Method for Improving the Durability of Carbon or Graphite Electrodes by Using Tio2 -Containing Products |
US7820129B2 (en) * | 2003-09-20 | 2010-10-26 | Sachtleben Chemie Gmbh | Method for improving the durability of carbon or graphite electrodes by using Tio2—containing products |
US20070018139A1 (en) * | 2005-05-10 | 2007-01-25 | Chandran K S R | Nanostructured titanium monoboride monolithic material and associated methods |
US7459105B2 (en) | 2005-05-10 | 2008-12-02 | University Of Utah Research Foundation | Nanostructured titanium monoboride monolithic material and associated methods |
US7501081B2 (en) | 2005-05-10 | 2009-03-10 | University Of Utah Research Foundation | Nanostructured titanium monoboride monolithic material and associated methods |
US20070235701A1 (en) * | 2005-05-10 | 2007-10-11 | Chandran K S R | Nanostructured titanium monoboride monolithic material and associated methods |
US20100176339A1 (en) * | 2009-01-12 | 2010-07-15 | Chandran K S Ravi | Jewelry having titanium boride compounds and methods of making the same |
US8211278B2 (en) | 2009-07-28 | 2012-07-03 | Alcoa Inc. | Composition for making wettable cathode in aluminum smelting |
CN102822392A (en) * | 2010-03-30 | 2012-12-12 | 日本电极株式会社 | Cathode carbon block for aluminum smelting purposes, and process for production thereof |
EP2554715A1 (en) * | 2010-03-30 | 2013-02-06 | Nippon Electrode Co., Ltd. | Cathode carbon block for aluminum smelting and process for production thereof |
EP2554715A4 (en) * | 2010-03-30 | 2015-03-11 | Nippon Electrode Co Ltd | Cathode carbon block for aluminum smelting and process for production thereof |
CN102822392B (en) * | 2010-03-30 | 2015-07-08 | 日本电极株式会社 | Cathode carbon block for aluminum smelting purposes, and process for production thereof |
Also Published As
Publication number | Publication date |
---|---|
AT298087B (en) | 1972-04-25 |
SE346197B (en) | 1972-06-26 |
BE745161A (en) | 1970-07-01 |
FR2029694A1 (en) | 1970-10-23 |
CA922384A (en) | 1973-03-06 |
ES374541A1 (en) | 1972-01-01 |
CH544474A (en) | 1973-11-15 |
NO124752B (en) | 1972-05-29 |
GB1283562A (en) | 1972-07-26 |
LU60219A1 (en) | 1970-03-23 |
FI50577B (en) | 1975-12-31 |
DE1904408B2 (en) | 1975-02-13 |
DE1904408A1 (en) | 1970-08-06 |
FI50577C (en) | 1976-04-12 |
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