DE490597C - Process for the manufacture of a crucible for high frequency electric ovens - Google Patents

Process for the manufacture of a crucible for high frequency electric ovens

Info

Publication number
DE490597C
DE490597C DEA52389D DEA0052389D DE490597C DE 490597 C DE490597 C DE 490597C DE A52389 D DEA52389 D DE A52389D DE A0052389 D DEA0052389 D DE A0052389D DE 490597 C DE490597 C DE 490597C
Authority
DE
Germany
Prior art keywords
crucible
conductive
carbon
manufacture
base body
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
DEA52389D
Other languages
German (de)
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.)
AEG AG
Original Assignee
AEG AG
Publication date
Priority to DEA52389D priority Critical patent/DE490597C/en
Application granted granted Critical
Publication of DE490597C publication Critical patent/DE490597C/en
Expired legal-status Critical Current

Links

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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/22—Furnaces without an endless core
    • H05B6/24—Crucible furnaces
    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C04B38/063—Preparing or treating the raw materials individually or as batches
    • C04B38/0635—Compounding ingredients
    • C04B38/0645—Burnable, meltable, sublimable materials
    • C04B38/068—Carbonaceous materials, e.g. coal, carbon, graphite, hydrocarbons
    • 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
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • 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
    • 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
    • C04B2111/90—Electrical properties
    • C04B2111/92—Electrically insulating materials
    • 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
    • C04B2111/90—Electrical properties
    • C04B2111/94—Electrically conducting materials

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)

Description

Verfahren zur Herstellung eines Tiegels für elektrische Hochfrequenzöfen Die Erfindung betrifft die Herstellung eines Tiegels für elektrische Hochfrequenzöfen aus einem einheitlichen Grundkörper. Es ist bekannt, Tiegel doppelwandig herzustellen und in den Zwischenraum zwischen die Wandungen elektrisch leitendes Material, z. B. Kohlepulver, einzufüllen. Infolge der Wärmedehnungen und der großen Temperaturunterschiede ergeben sich aber leicht Betriebsstörungen, so daß diese Tiegel nicht nur kompliziert, sondern auch im Betrieb wenig zuverlässig sind. Erfindungsgemäß werden daher die Tiegel aus einem einheitlichen Grundstoff hergestellt, der in einer elektrisch nichtleitenden, unverbrennlichenMasse einen elektrisch leitenden, brennbaren Stoff fein verteilt enthält. Es kann z. B. ausgegangen werden von einem fein verteilten Gemisch von Ton und Graphit oder Kohlepulver. Dieser Tiegel wird zunächst in reduzierender Atmosphäre gebrannt und dann unter Sauerstoff oder Luftzutritt so hoch erhitzt, daß in den äußeren Schichten des Tiegels der Kohlestoff verbrennt, so daß diese nichtleitend werden und lediglich die Mittelschicht des Tiegels leitend ist.Process for the manufacture of a crucible for high-frequency electric furnaces The invention relates to the manufacture of a crucible for high-frequency electric furnaces from a uniform body. It is known to produce double-walled crucibles and in the space between the walls electrically conductive material, e.g. B. carbon powder to fill. As a result of the thermal expansion and the large temperature differences but it can easily result in malfunctions, so that these crucibles are not only complicated, but are also not very reliable in operation. According to the invention are therefore the Crucible made from a uniform base material, which is in an electrically non-conductive, incombustible mass an electrically conductive, combustible material finely divided contains. It can e.g. B. assume a finely divided mixture of Clay and graphite or carbon powder. This crucible is first placed in a reducing atmosphere fired and then heated under oxygen or air so high that in the outer layers of the crucible burn the carbon, making them non-conductive and only the middle layer of the crucible is conductive.

Ein Ausführungsbeispiel des Tiegels ist in Abb. i teilweise in Ansicht, teilweise geschnitten dargestellt. Abb.2 zeigt die Anordnung des Tiegels in der Hochfrequenzspule.An embodiment of the crucible is partially shown in Fig. I, shown partially cut. Fig.2 shows the arrangement of the crucible in the High frequency coil.

Der Tiegel besteht aus dem Körper i, der sehr hitzebeständig, aber elektrisch nicht leitend ist und der Mittelschicht 2, die ebenfalls hitzebeständig, jedoch elektrisch leitend. ist. Der elektrische Leitwiderstand dieser Mittelschicht wird sehr groß gewählt. Ein solcher Tiegel kann auch ohne weiteres zum Schmelzen von Eisen verwendet werden, da ein Abwandern von Kohlenstoff aus dem Tiegel in das Eisen nicht möglich ist.The crucible consists of the body i, which is very heat resistant, however is electrically non-conductive and the middle layer 2, which is also heat-resistant, but electrically conductive. is. The electrical resistance of this middle layer is chosen very large. Such a crucible can also easily be melted used by iron because carbon migrates from the crucible into it Iron is not possible.

Wird der Tiegel in das Feld einer HochfrequenzsPule 3 gebracht, so erfährt er selbst infolge der in der leitenden Schicht :2 induzierten Ströme eine Erhitzung.If the crucible is brought into the field of a high-frequency coil 3, so he himself experiences one as a result of the currents induced in the conductive layer: 2 Heating.

Claims (3)

PATENTANSPRÜCHE: i. Verfahren zur Herstellung eines Tiegels für elektrische Hochfrequenzöfen, dadurch gekennzeichnet, daß ein einheitlicher Grundkörper aus einem Gemisch eines elektrisch leitenden, brennbaren Stoffes und einem nichtbrennbaren, nichtleitenden Stoffe hergestellt wird und die Außenschichten des Grundkörpers durch Ausbrennen des verbrennbaren Anteils des Grundkörpers elektrisch nichtleitend gemacht werden. PATENT CLAIMS: i. Method of manufacturing a crucible for electrical High-frequency furnaces, characterized in that a uniform base body consists of a mixture of an electrically conductive, flammable substance and a non-flammable, non-conductive materials are produced and the outer layers of the base body through Burning out the combustible portion of the base body made electrically non-conductive will. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß der Anteil der Grundmasse an nichtleitendem Stoff aus Ton und der Anteil der Grundmasse an elektrisch leitendem Stoff aus Graphit oder Kohle besteht. 2. The method according to claim i, characterized in that the proportion of Basic mass of non-conductive material made of clay and the proportion of the basic mass of electrical conductive material made of graphite or carbon. 3. Verfahren nach Anspruch i und 2, dadurch gekennzeichnet, daß der Tiegel aus einem Gemisch von Ton und Graphit oder Kohlepulver in feiner Verteilung geformt, in reduzierender Atmosphäre gebrannt und hierauf unter Sauerstoff- oder Luftzutritt so hoch erhitzt wird, daß der Kohlenstoff in den äußeren Schichten des Tiegels verbrennt und diese somit von Kohlenstoff frei werden.3. The method according to claim i and 2, characterized in that the crucible is made from a mixture of clay and graphite or carbon powder formed in fine distribution, burned in a reducing atmosphere and then, with the admission of oxygen or air, it is heated so high that the carbon burns in the outer layers of the crucible, freeing them of carbon will.
DEA52389D Process for the manufacture of a crucible for high frequency electric ovens Expired DE490597C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA52389D DE490597C (en) Process for the manufacture of a crucible for high frequency electric ovens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA52389D DE490597C (en) Process for the manufacture of a crucible for high frequency electric ovens

Publications (1)

Publication Number Publication Date
DE490597C true DE490597C (en) 1930-01-30

Family

ID=6938453

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA52389D Expired DE490597C (en) Process for the manufacture of a crucible for high frequency electric ovens

Country Status (1)

Country Link
DE (1) DE490597C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0056597A2 (en) * 1981-01-16 1982-07-28 INTERATOM Gesellschaft mit beschränkter Haftung Ceramic heat insulating shaped body and process for the preparation thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0056597A2 (en) * 1981-01-16 1982-07-28 INTERATOM Gesellschaft mit beschränkter Haftung Ceramic heat insulating shaped body and process for the preparation thereof
EP0056597A3 (en) * 1981-01-16 1982-08-11 Interatom Internationale Atomreaktorbau Gmbh Ceramic heat insulating material and process for the preparation thereof

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