DE1005656B - Process for protecting electrodes made of graphite or amorphous carbon against air burn-off in an electric furnace - Google Patents
Process for protecting electrodes made of graphite or amorphous carbon against air burn-off in an electric furnaceInfo
- Publication number
- DE1005656B DE1005656B DEK25257A DEK0025257A DE1005656B DE 1005656 B DE1005656 B DE 1005656B DE K25257 A DEK25257 A DE K25257A DE K0025257 A DEK0025257 A DE K0025257A DE 1005656 B DE1005656 B DE 1005656B
- Authority
- DE
- Germany
- Prior art keywords
- electrode
- protective layer
- melting
- paint contains
- paint
- 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.)
- Pending
Links
Classifications
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
- C04B41/5042—Zirconium oxides or zirconates; Hafnium oxides or hafnates
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/87—Ceramics
-
- 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
- H05B7/12—Arrangements for cooling, sealing or protecting electrodes
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0087—Uses not provided for elsewhere in C04B2111/00 for metallurgical applications
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Discharge Heating (AREA)
Description
Verfahren zum. Schutz von Elektroden aus Graphit oder amorpher Kohle
gegen Luftabbrand im Elektroofen
Im Sinne vorliegender Erfindung sind hochschmelzende Stoffe vorzugsweise solche, deren Schmelzpunkt in der Nähe oder über dem dies Eisens bzw. Stahles liegt.In the context of the present invention, high-melting substances are preferred those whose melting point is close to or above that of iron or steel.
Die Schutzschicht kann auch auf die grüne ungebrannte Elektrode aufgetragen werden, wenn sie so zusammengesetzt ist, daß bei der Brenntemperatur die schmelzenden Bestandteile im die Poren der Elektrode eindringen. Es besteht dann die Möglichkeit, zur weiteren Verbesserung des Schutzes gegen Lu,ftabbrand nach dem Brennen eine weitere Schutzschicht auf die teilweise in die Elektrode eingelagerte Schicht aufzutragen.The protective layer can also be applied to the green unfired electrode if it is so composed that at the firing temperature the melting Components penetrate the pores of the electrode. There is then the possibility to further improve the protection against air burn-off after burning to apply another protective layer on the layer partially embedded in the electrode.
Als hochschmelzender Bestandteil des Anstrichstoffes wird vorzugsweise sogenanntes stabilisiertes Zirkonoxyd benutzt. Bei dieser Verbindung sind die Schwierigkeiten behoben, die sich bei normalem Zirkonoxyd, bei einer Erwärmung auf über 800'C durch die kristalline Umwandlung von der monoklinen in die tetragonale Form ergeben. Da diese Umwandlung von einer Volumenänderung begleitet wird, würde die Einheitlichkeit der Schicht hierdurch zerstört. Bei stabilisiertem Zirkonoxyd ist die Ausdehnung auch bei einer Erwärmung über 800'C linear, wie auch bei Abkühlung die Schrumpfung linear verläuft.So-called stabilized zirconium oxide is preferably used as the high-melting component of the paint. This connection eliminates the difficulties that arise with normal zirconium oxide when heated to over 800 ° C due to the crystalline conversion from the monoclinic to the tetragonal form. Since this conversion is accompanied by a change in volume, this would destroy the uniformity of the layer. In the case of stabilized zirconium oxide, the expansion is linear even when heated to over 800 ° C , just as the shrinkage is linear when it is cooled.
Stabilisiertes Zirkonoxyd eignet sich besonders gut, ,venn es mit Aluminiumoxyd, Chromoxyd, Cbrommagnesit, hlaänesiumsilikat, Magnesit oder Kieselsäure gemischt wird.Stabilized zirconium oxide is particularly suitable if it is with Aluminum oxide, chromium oxide, chromium magnesite, halogenated silicate, magnesite or silicic acid is mixed.
Wenn die gewählten Bestandteile dies Anstri,chätoffes schlechte elektrische Leitfähigkeit besitzen, wie es z. B. bei Zirkonverbindungen der Fall ist, so wird gemäß der Erfindung weiter vorgeschlagen, daß dde Schutzschicht unterhalb der Kontaktbacken auf die Elektrode aufgetragen wird. Hierdurch wird ein normaler Stromühergang von den Kontaktbacken auf die Elektrode gewährleistet.If the chosen ingredients do so, it will cause poor electrical power Have conductivity, as it is, for. B. is the case with zirconium compounds, so will further proposed according to the invention that the protective layer below the contact jaws is applied to the electrode. This will result in a normal current flow of the contact jaws on the electrode.
Grundsätzlich kann der Anstrichstoff pastenförmig sein und aufgestrichen werden, oder .er kann mehr flüssig sein und aufgesprüht werden.In principle, the paint can be paste-like and painted on or. it can be more liquid and sprayed on.
Ein wesentlicher Gedanke des Verfahrens nach der Erfindung besteht darin, einen Anstrichstoff auf die Elektrode aufzubringen, dessen hochschmelzende Bestandteile zum Teil oder dessen Zersetzungsprodukte bzw. die Zersetzungsprodukte irgendwelcher Füllstoffe bei der hohen Temperatur oberhalb des Sch.melzbades in die Poren der Elektrode eindringen, ünd zwar dergestalt, d:aß außen noch eine ausreichende hochschmelzende Schicht verbleibt. Die eingedrungenen Bestanditeile bilden die Verankerung für die äußere Schutzschicht. In jedem Fall begründet die verbleibende äußere Schicht - auch wenn sie nicht mehr ganz vollständig ist - eine wesentliche Verringerung des Luftabbrandes der Elektrode über dem Schmelzbad.There is an essential idea of the method according to the invention in applying a paint to the electrode, its high melting point Components in part or their decomposition products or the decomposition products any fillers at the high temperature above the melt bath in penetrate the pores of the electrode in such a way that there was still sufficient outside high-melting layer remains. The penetrated components form the anchorage for the outer protective layer. In any case, the remaining outer layer constitutes - even if it is no longer completely complete - a substantial reduction the air consumption of the electrode above the weld pool.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK25257A DE1005656B (en) | 1955-03-21 | 1955-03-21 | Process for protecting electrodes made of graphite or amorphous carbon against air burn-off in an electric furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK25257A DE1005656B (en) | 1955-03-21 | 1955-03-21 | Process for protecting electrodes made of graphite or amorphous carbon against air burn-off in an electric furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1005656B true DE1005656B (en) | 1957-04-04 |
Family
ID=7217258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEK25257A Pending DE1005656B (en) | 1955-03-21 | 1955-03-21 | Process for protecting electrodes made of graphite or amorphous carbon against air burn-off in an electric furnace |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1005656B (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE766088C (en) * | 1940-02-10 | 1953-03-23 | Du Pont | Electrode connection for melt flow electrolysis cells |
-
1955
- 1955-03-21 DE DEK25257A patent/DE1005656B/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE766088C (en) * | 1940-02-10 | 1953-03-23 | Du Pont | Electrode connection for melt flow electrolysis cells |
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