EP0467230B1 - Cold skull melting crucible - Google Patents
Cold skull melting crucible Download PDFInfo
- Publication number
- EP0467230B1 EP0467230B1 EP91111644A EP91111644A EP0467230B1 EP 0467230 B1 EP0467230 B1 EP 0467230B1 EP 91111644 A EP91111644 A EP 91111644A EP 91111644 A EP91111644 A EP 91111644A EP 0467230 B1 EP0467230 B1 EP 0467230B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- crucible
- base part
- segments
- trough
- wall
- 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
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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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/22—Furnaces without an endless core
- H05B6/24—Crucible furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
- F27B14/061—Induction furnaces
- F27B14/063—Skull melting type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D2001/0046—Means to facilitate repair or replacement or prevent quick wearing
Definitions
- the invention relates to a cold-melting crucible for melting small amounts of metal in suspension, which contains the crucible trough in its upper part and can be flanged with the base part (2) to a vacuum line or a corresponding apparatus, the crucible trough being made of appropriately shaped and wall sections (1, 1 ') which are separated from one another, manufactured and assembled in one piece and which enclose the center of the trough, in which cooling channels (6) run, into which supply lines (7) for the coolant starting from the base part are introduced, and wherein the base element contains the supply and discharge lines for the cooling system and discharge tubes (8) for the coolant protruding from the base part, each of which is detachably connected to a single wall segment, in particular soldered, serve as a connecting part between the upper part and the base part which the feed lines (7) through the A line pipes protrude upwards into the wall segments.
- Cold melting crucibles are used for the production of very pure metal samples and are used in particular as melting furnaces for growing single crystals.
- the low level of contamination of metals melted in cold-melting crucibles is due to the fact that the crucible wall is strongly cooled and generated of a magnetic field by means of high-frequency induction coils which are initially held firmly and then melted metal bodies in a stable position floating freely in the melting chamber (cf. DE-PS 518499; Laboratory Methods, Vol. LXVII No. 404 June 1963, pp. - 301 ff.; High Temperature Melting without Contamination in Cold Crucibles).
- the aim is to divide the crucible wall into as many segments as possible.
- a cold-melting crucible of this type is known from DE-OS 38 19 153.
- the individual wall segments which are designed as tapering triangular segments, are produced from a solid material by means of quick and simple working methods, such as milling.
- a larger starting workpiece for example a cylindrical solid material with a larger diameter, is assumed.
- the individual wall segments are connected by soldering to the discharge pipes for the coolant that protrude from the base part. Any necessary adjustment is easily possible by bending the cooling lines.
- connection between the individual wall segment and the cooling line is expediently made by soft soldering.
- a single wall segment for repairing the crucible can be easily removed.
- the crucible is therefore easy and inexpensive to repair because of the single-wall segments can easily be removed and replaced with new ones if necessary.
- the compact design of the upper part enclosing the crucible trough enables effective coupling to the HF magnetic field.
- the RF power coupling to the melting material improves with an increasing number of individual segments. It is disadvantageous, however, that the hole in the central crucible inner region increases with the increasing number of individual segments.
- More or less melting material often penetrates into this hole in the central crucible area during operation of the crucible and causes a short circuit between the segments. This has the consequence that the RF coupling deteriorates, which disadvantageously reduces the temperature of the melt.
- the tapered segments in the crucible center are exposed to particularly high wear and stress due to the concentrated density of the ring currents and the melt.
- EP-A 39 20 66 which belongs to the fictitious prior art, and which appears suitable to avoid the disadvantages described. It consists in providing a wall element adjoining the center of the crucible trough and shaping it in such a way that it fills a circular central opening in the bottom of the crucible trough which is left out of the other wall segments. The remaining wall segments are the same, are designed to taper towards the center and are accordingly arranged symmetrically to one another.
- a device is also known from US Pat. No. 3,709,678 in which the crucible trough is filled by a circular wall segment.
- the wall segment designed as a flat segment allows cooling channels to the particularly heat-stressed center of the crucible trough. This alone eliminates some of the problems that result from insufficient cooling of this crucible zone.
- the flat segment can be easily replaced. Because if such a flat segment is damaged during operation, the required number of flat segments is simply cut off in slices from a corresponding profile piece.
- a further development of the flat segment (1 ') enclosing the center consists in that it consists of at least two sections which abut one another in or at the center of the crucible trough.
- the cold-melting crucible has an upper part, which consists of wall segments 1 and 1 ', and a base part 2, which terminates at the bottom with a flange 3 and connects to the inlets and outlets for the Coolant is connected.
- the base part also has a further flange 4 for receiving the pressure vessel - which is not shown in the drawing.
- the wall segments 1 and 1 ' enclose the crucible trough. They are surrounded by a high-frequency coil 5 in the exterior.
- the wall segments 1 and 1 ' which are separated from one another by a gap of at most 0.5 mm, are shaped in such a way that the melting space is optimally adapted to the melting conditions.
- Cooling channels 6 run in the segments, which are guided along the inner surface of the melting chamber in such a way that sufficient cooling of the cup wall in the form of a cap is achieved.
- the mechanical connection between the upper part consisting of the wall segments 1 and 1 'and the base part 2 is formed by the discharge pipes 8 and 8a. These are hard-soldered to the base part, but soft-soldered to the respective wall segment, so that the connection can be easily released in the event of a repair.
- the drain pipes 8 are connected to the drain 8 'in the base part 2 above the flange 3. Like the coolant supply line, they are designed as a ring line in the base part and enclose a central opening 9.
- a single flat segment 1 ' is provided.
- the remaining segments are designed as sections 1 tapering towards the center of the crucible.
- a flat segment consisting of two identical parts 1 'is shown with additional flat segments 1' arranged crosswise to it.
- FIG. 2c shows an embodiment with the same, crosswise arranged flat segments 1 '.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen Kalt-Schmelz-Tiegel zum Schmelzen kleiner Metallmengen in der Schwebe, der in seinem oberen Teil die Tiegelmulde enthält und mit dem Basisteil (2) an eine Unterdruckleitung oder eine entsprechende Apparatur anflanschbar ist, wobei die Tiegelmulde aus entsprechend geformten und durch Schlitze voneinander getrennten, in Einzelanfertigung hergestellten und zusammengefügten, das Zentrum der Mulde einschließenden Wandsegmenten (1,1') gebildet ist, in denen Kühlkanäle (6) verlaufen, in die vom Basisteil ausgehend Zuführungsleitungen (7) für das Kühlmittel eingebracht sind und wobei das Basiselement die Zu- und Ableitungen für das Kühlsystem enthält und aus dem Basisteil herausragende Ableitungsrohre (8) für das Kühlmittel, die jeweils mit einem Einzelwandsegment herauslösbar dicht verbunden, insbesondere weichgelötet sind, als Verbindungsteil zwischen dem oberen Teil und dem Basisteil dienen, aus dem die Zuführungsleitungen (7) durch die Ableitungsrohre nach oben in die Wandsegmente ragen.The invention relates to a cold-melting crucible for melting small amounts of metal in suspension, which contains the crucible trough in its upper part and can be flanged with the base part (2) to a vacuum line or a corresponding apparatus, the crucible trough being made of appropriately shaped and wall sections (1, 1 ') which are separated from one another, manufactured and assembled in one piece and which enclose the center of the trough, in which cooling channels (6) run, into which supply lines (7) for the coolant starting from the base part are introduced, and wherein the base element contains the supply and discharge lines for the cooling system and discharge tubes (8) for the coolant protruding from the base part, each of which is detachably connected to a single wall segment, in particular soldered, serve as a connecting part between the upper part and the base part which the feed lines (7) through the A line pipes protrude upwards into the wall segments.
Kalt-Schmelz-Tiegel werden zur Herstellung sehr reiner Metallproben eingesetzt und insbesondere als Schmelzöfen zur Züchtung von Einkristallen verwendet. Die geringe Verunreinigung von in Kalt-Schmelz-Tiegeln erschmolzenen Metallen beruht darauf, daß infolge starker Kühlung der Tiegelwandung und durch Erzeugen eines Magnetfeldes mittel Hochfrequenz-Induktionsspulen der zunächst fest und dann geschmolzene Metallkörper in einer stabilen Lage frei schwebend im Schmelzraum gehalten wird (vgl. DE-PS 518499; Laboratory Methods, Vol. LXVII Nr. 404 Juni 1963, S. - 301 ff.; High Temperature Melting without Contamination in Cold Crucibles). Um die transformatorische Wirkung der Hochfrequenzspule optimal auszunutzen, wird eine Aufteilung der Tiegelwandung in möglichst viele Segmente angestrebt.Cold melting crucibles are used for the production of very pure metal samples and are used in particular as melting furnaces for growing single crystals. The low level of contamination of metals melted in cold-melting crucibles is due to the fact that the crucible wall is strongly cooled and generated of a magnetic field by means of high-frequency induction coils which are initially held firmly and then melted metal bodies in a stable position floating freely in the melting chamber (cf. DE-PS 518499; Laboratory Methods, Vol. LXVII No. 404 June 1963, pp. - 301 ff.; High Temperature Melting without Contamination in Cold Crucibles). In order to optimally utilize the transformer effect of the high-frequency coil, the aim is to divide the crucible wall into as many segments as possible.
Ein Kalt-Schmelz-Tiegel dieser Art ist aus der DE-OS 38 19 153 bekannt. Die als spitz zulaufende Dreieckssegmente ausgebildeten Einzelwandsegmente werden durch schnelle und einfache Arbeitsverfahren, wie beispielsweise Fräsen, aus einem Vollmaterial hergestellt. Zur Berücksichtigung des Metallverlustes durch den Trennvorgang (relativ breite Schlitze durch die Bearbeitung) wird von einem größeren Ausgangswerkstück, beispielsweise einem zylindrischen Vollmaterial mit größerem Durchmesser ausgegangen. Andere Herstellungsverfahren, wie beispielsweise Gießverfahren, sind ebenfalls einsetzbar.A cold-melting crucible of this type is known from DE-OS 38 19 153. The individual wall segments, which are designed as tapering triangular segments, are produced from a solid material by means of quick and simple working methods, such as milling. In order to take into account the metal loss due to the cutting process (relatively wide slots due to the machining), a larger starting workpiece, for example a cylindrical solid material with a larger diameter, is assumed. Other manufacturing processes, such as casting processes, can also be used.
Die Einzelwandsegmente werden durch Löten mit den aus dem Basisteil herausragenden Ableitungsrohren für das Kühlmittel verbunden. Eine evtl. notwendige Justage ist leicht durch Biegen der Kühlleitungen möglich.The individual wall segments are connected by soldering to the discharge pipes for the coolant that protrude from the base part. Any necessary adjustment is easily possible by bending the cooling lines.
Die Verbindung zwischen Einzelwandsegment und der Kühlleitung wird zweckmäßigerweise durch Weichlöten hergestellt. Das hat zur Folge, daß ein einzelnes Wandsegment zur Reparatur des Tiegels leicht herausgelöst werden kann. Der Tiegel ist somit leicht und kostengünstig zu reparieren, da Einzelwandsegmente leicht herausgelöst und ggf. durch neue ersetzt werden können.The connection between the individual wall segment and the cooling line is expediently made by soft soldering. As a result, a single wall segment for repairing the crucible can be easily removed. The crucible is therefore easy and inexpensive to repair because of the single-wall segments can easily be removed and replaced with new ones if necessary.
Die kompakte Bauart des oberen, die Tiegelmulde umschließenden Teils ermöglicht eine effektive Ankopplung an das HF-Magnetfeld. Dabei verbessert sich die HF-Leistungsankopplung auf das Schmelzgut mit zunehmender Zahl der Einzelsegmente. Nachteilig ist dabei jedoch, daß sich mit der zunehmenden Zahl der Einzelsegmente das sich im zentralen Tiegelinnenbereich befindliche Loch vergrößert.The compact design of the upper part enclosing the crucible trough enables effective coupling to the HF magnetic field. The RF power coupling to the melting material improves with an increasing number of individual segments. It is disadvantageous, however, that the hole in the central crucible inner region increases with the increasing number of individual segments.
In dieses Loch im zentralen Tiegelbereich dringt bei Betrieb des Tiegels des öfteren mehr oder weniger Schmelzgut ein und verursacht einen Kurzschluß zwischen den Segmenten. Dies hat zur Folge, daß sich die HF-Ankopplung verschlechtert, wodurch sich nachteilig die Temperatur der Schmelze verringert.More or less melting material often penetrates into this hole in the central crucible area during operation of the crucible and causes a short circuit between the segments. This has the consequence that the RF coupling deteriorates, which disadvantageously reduces the temperature of the melt.
Die im Tiegelzentrum spitz auslaufenden Segmente sind durch die dort konzentrierte Dichte der Ringströme und durch die Schmelze außerdem besonders hohem Verschleiß und Belastungen ausgesetzt.The tapered segments in the crucible center are exposed to particularly high wear and stress due to the concentrated density of the ring currents and the melt.
Bei der Entnahme oder beim Wenden einer fertigen Probe (besonders häufig bei größeren Tiegeln) ergeben sich Schwierigkeiten, wenn sich im Zentralloch ein Pfropfen aus Schmelzgut gebildet hat, der sich in den vertikalen Schlitzen regelrecht verankert.Difficulties arise when taking or turning a finished sample (particularly often in the case of larger crucibles) if a plug of melted material has formed in the central hole and is literally anchored in the vertical slots.
Um eine gute Probe zu erzielen, wird überwiegend dreimal aufgeschmolzen und die Probe jeweils umgedreht. Damit soll eine gleichmäßige homogene Verteilung der Einzelelemente erreicht werden. Hat sich jedoch ein Pfropfen gebildet, so bricht dieser beim Umdrehen ab und muß teilweise aufwendig entfernt werden.In order to achieve a good sample, it is melted three times and the sample is turned over. This is to achieve a uniform, homogeneous distribution of the individual elements. However, one has Graft formed, it breaks off when turned over and has to be removed in some cases with great effort.
Durch diese Prozedur wird der Reinheitsgrad und die stöchiometrische Genauigkeit der Proben verschlechtert.This procedure deteriorates the degree of purity and the stoichiometric accuracy of the samples.
Aus der zum fiktiven Stand der Technik gehörenden EP-A 39 20 66 ist eine Lösung bekannt, die geeignet erscheint, die beschriebenen Nachteile zu vermeiden. Sie besteht darin, ein das Zentrum der Tiegelmulde anschließendes Wandelement vorzusehen und so zu formen, daß es eine, von den übrigen Wandsegmenten ausgesparte, kreisrunde zentrale Öffnung am Boden der Tiegelmulde ausfüllt. Die übrigen Wandsegmente sind gleich, zum Zentrum hin sich verjüngend ausgestaltet und dementsprechend symmetrisch zueinander angeordnet.A solution is known from EP-A 39 20 66, which belongs to the fictitious prior art, and which appears suitable to avoid the disadvantages described. It consists in providing a wall element adjoining the center of the crucible trough and shaping it in such a way that it fills a circular central opening in the bottom of the crucible trough which is left out of the other wall segments. The remaining wall segments are the same, are designed to taper towards the center and are accordingly arranged symmetrically to one another.
Auch ist aus der US-PS 3 709 678 eine Vorrichtung bekannt, bei der die Tiegelmulde durch ein kreisrundes Wandsegment ausgefüllt wird.A device is also known from US Pat. No. 3,709,678 in which the crucible trough is filled by a circular wall segment.
Es ist daher Aufgabe der Erfindung, ausgehend von dem bekannten Kalt-Schmelz-Tiegel diesen - alternativ zu den dem Stand der Technik zu entnehmenden Lösungsvorschlägen - so zu verbessern, daß die beschriebenen Nachteile vermieden werden.It is therefore an object of the invention, starting from the known cold-melting crucible, to improve it - as an alternative to the proposed solutions to be found in the prior art - in such a way that the disadvantages described are avoided.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zumindest ein als Flachsegment ausgebildetes Wandsegment (1'), das sich, das Zentrum der Tiegelmulde einschließend, über den ganzen Tiegeldurchmesser erstreckt und parallele Wände aufweist in der Draufsicht sowie als Segmente ausgebildete Wandsegmente (1), die sich zum Zentrum verjüngen, vorgesehen sind.This object is achieved according to the invention in that at least one wall segment (1 ') designed as a flat segment, which, including the center of the crucible trough, extends over the entire crucible diameter and has parallel walls in plan view and wall segments (1) designed as segments, which taper towards the center, are provided.
Das als Flachsegment ausgebildete Wandsegment erlaubt es, Kühlkanäle bis in das besonders wärmebelastete Zentrum der Tiegelmulde zu führen. Allein hierdurch entfallen ein Teil der Probleme, die sich aus der nicht hinreichenden Kühlung dieser Tiegelzone ergeben.The wall segment designed as a flat segment allows cooling channels to the particularly heat-stressed center of the crucible trough. This alone eliminates some of the problems that result from insufficient cooling of this crucible zone.
Das Flachsegment kann leicht ausgewechselt werden. Denn sollte ein solches Flachsegment während des Betriebs beschädigt werden, wird hierfür ganz einfach von einem entsprechenden Profilstück die erforderliche Anzahl von Flachsegmenten scheibenweise abgeschnitten.The flat segment can be easily replaced. Because if such a flat segment is damaged during operation, the required number of flat segments is simply cut off in slices from a corresponding profile piece.
Eine Weiterausgestaltung des das Zentrum einschließenden Flachsegmentes (1') besteht darin, daß dieses aus wenigstens zwei Teilstücken besteht, die im bzw. am Zentrum der Tiegelmulde aneinander anliegen.A further development of the flat segment (1 ') enclosing the center consists in that it consists of at least two sections which abut one another in or at the center of the crucible trough.
Diese einander anliegenden Teilsegmente können auseinandergeschoben werden, so daß für den Fall, daß die Schmelze auslaufen soll, im Zentrum der Tiegelmulde eine Öffnung entsteht.These adjacent partial segments can be pushed apart, so that in the event that the melt is to run out, an opening is created in the center of the crucible trough.
Ausführungsbeispiele des Kalt-Schmelz-Tiegels gemäß der Erfindung sind in der Zeichnung schematisch dargestellt und werden im folgenden näher erläutert:Exemplary embodiments of the cold-melting crucible according to the invention are shown schematically in the drawing and are explained in more detail below:
Es zeigen
Figur 1- einen Vertikalschnitt durch den Tiegel mit als Flachsegment ausgebildetem Wandsegment längs der in Figur 2a angegebenen Linie A - B;
- Figur 2a,b,c
- Draufsichten auf unterschiedliche Ausführungsformen des oberen Teils des Tiegels von Figur 1 (ohne HF-Wicklung, jedoch mit zusätzlich angedeuteten Kühlleitungsrohren bzw. -kanälen);
- Figur 2a
- eine Ausführungsform mit einem Flachsegment
- Figur 2b
- eine Ausführungsform mit einem aus zwei Teilen bestehenden Flachsegment gemäß Figur 2a und kreuzweise dazu angeordneten weiteren Flachsegmenten;
- Figur 2c
- eine Ausführungsform mit vier gleichen, kreuzweise angeordneten Flachsegmenten.
- Figure 1
- a vertical section through the crucible with a wall segment formed as a flat segment along the line A - B indicated in Figure 2a;
- Figure 2a, b, c
- Top views of different embodiments of the upper part of the crucible of Figure 1 (without HF winding, but with additionally indicated cooling line pipes or channels);
- Figure 2a
- an embodiment with a flat segment
- Figure 2b
- an embodiment with a two-part flat segment according to Figure 2a and arranged crosswise to further flat segments;
- Figure 2c
- an embodiment with four identical, crosswise arranged flat segments.
Der Kalt-Schmelz-Tiegel weist - wie aus Figur 1 hervorgeht - ein oberes Teil, das aus Wandsegmenten 1 und 1' besteht, sowie ein Basisteil 2 auf, das nach unten mit einem Flansch 3 abschließt und an die Zu- und Ableitungen für das Kühlmittel angeschlossen ist. Das Basisteil weist ferner einen weiteren Flansch 4 zur Aufnahme des Druckbehälters - der in der Zeichnung nicht dargestellt ist - auf.As can be seen from FIG. 1, the cold-melting crucible has an upper part, which consists of
Die Wandsegmente 1 und 1' umschließen die Tiegelmulde. Sie sind im Außenraum von einer Hochfrequenzspule 5 umgeben.The
Die Wandsegmente 1 und 1', die durch einen Spalt von maximal 0,5 mm voneinander getrennt sind, sind so geformt, daß der Schmelzraum den Schmelzbedingungen optimal angepaßt ist. In den Segmenten laufen Kühlkanäle 6, die entlang der inneren Oberfläche des Schmelzraumes so geführt sind, daß eine ausreichende Kühlung der am Boden kalottenförmigen Tiegelwandung erreicht wird. Die Zuleitungsrohre 7, die vom Basisteil 2 ausgehen und mit der Zuleitung 7' für das Kühlmittel in Verbindung stehen, dienen der Zuführung des Kühlmittels.The
Die mechanische Verbindung zwischen dem oberen, aus den Wandsegmenten 1 und 1' bestehenden Teil und dem Basisteil 2 bilden die Ableitungsrohre 8 bzw. 8a. Diese sind mit dem Basisteil hartverlötet, mit dem jeweiligen Wandsegment dagegen weichverlötet, so daß im Reparaturfall die Verbindung leicht gelöst werden kann.The mechanical connection between the upper part consisting of the
Die Ableitungsrohre 8 sind mit der Ableitung 8' im Basisteil 2 oberhalb des Flansches 3 verbunden. Sie sind im Basisteil ebenso wie die Kühlmittelzuleitung als Ringleitung ausgebildet und umschließen eine zentrale Öffnung 9.The drain pipes 8 are connected to the drain 8 'in the
Bei der in Figur 2a dargestellten Ausführungsform ist ein einziges Flachsegment 1' vorgesehen. Die übrigen Segmente sind als sich zum Zentrum des Tiegels hin verjüngende Teilstücke 1 ausgebildet.In the embodiment shown in FIG. 2a, a single flat segment 1 'is provided. The remaining segments are designed as
Bei der in Figur 2b dargestellten Ausführungsform ist ein aus zwei gleichen Teilstücken 1' bestehendes Flachsegment dargestellt mit zusätzlich kreuzweise dazu angeordneten, weiteren Flachsegmenten 1'.In the embodiment shown in FIG. 2b, a flat segment consisting of two identical parts 1 'is shown with additional flat segments 1' arranged crosswise to it.
Figur 2c zeigte eine Ausführungsform mit gleichen, kreuzweise angeordneten Flachsegmenten 1'.FIG. 2c shows an embodiment with the same, crosswise arranged flat segments 1 '.
Claims (2)
- Cold melting crucible for melting small amounts of metal in suspension, which in its upper part contains the crucible trough and by its base part (2) can be flanged to a vacuum pipe or a corresponding apparatus, the crucible trough being formed by correspondingly shaped wall segments (1, 1') which are separated from one another by slits and are produced individually and joined together, which enclose the centre of the trough and in which extend cooling ducts (6) into which are introduced, starting from the base part, supply pipes (7) for the coolant, the base element containing the inlet and outlet pipes for the cooling system, while outlet pipes (8) for the coolant, which project out of the base part and each of which is sealingly and removably connected to an individual wall segment, particularly by soft soldering, serve as a connecting part between the upper part and the base part from which the supply pipes (7) project through the outlet pipes upwards into the wall segments, characterized in that at least one wall segment (1') in the form of a flat segment which, enclosing the centre of the crucible trough, extends over the entire diameter of the crucible and in plan view has parallel walls, and also wall segments (1) in the form of segments, which taper towards the centre, are provided.
- Cold melting crucible according to Claim 1, characterized in that the flat segment (1') consists of at least two pieces lying one against the other in or at the centre of the crucible trough.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4022561A DE4022561C1 (en) | 1990-07-16 | 1990-07-16 | |
| DE4022561 | 1990-07-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0467230A1 EP0467230A1 (en) | 1992-01-22 |
| EP0467230B1 true EP0467230B1 (en) | 1995-10-04 |
Family
ID=6410364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91111644A Expired - Lifetime EP0467230B1 (en) | 1990-07-16 | 1991-07-12 | Cold skull melting crucible |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0467230B1 (en) |
| AT (1) | ATE128760T1 (en) |
| DE (2) | DE4022561C1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528620A (en) * | 1993-10-06 | 1996-06-18 | Fuji Electric Co., Ltd. | Levitating and melting apparatus and method of operating the same |
| CN112229214B (en) * | 2020-09-04 | 2022-06-17 | 安徽骏马新材料科技股份有限公司 | Intelligent dry-method lead melting furnace |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2036418A5 (en) * | 1969-03-13 | 1970-12-24 | Commissariat Energie Atomique | |
| US4738713A (en) * | 1986-12-04 | 1988-04-19 | The Duriron Company, Inc. | Method for induction melting reactive metals and alloys |
| FR2621387B1 (en) * | 1987-10-06 | 1990-01-05 | Commissariat Energie Atomique | INDUCTION OVEN CRUCIBLE |
| DE3819153A1 (en) * | 1988-06-04 | 1989-12-07 | Kernforschungsanlage Juelich | METHOD FOR PRODUCING A COLD-MELTING POT |
| DE3819154C1 (en) * | 1988-06-04 | 1990-02-01 | Kernforschungsanlage Juelich Gmbh, 5170 Juelich, De | |
| EP0392066A1 (en) * | 1989-04-14 | 1990-10-17 | Vsesojuzny Nauchno-Issledovatelsky Proektno-Konstruktorsky I Tekhnologichesky Inst. Elektrotermicheskogo Oborudovania Vniieto | Vacuum induction furnace |
-
1990
- 1990-07-16 DE DE4022561A patent/DE4022561C1/de not_active Expired - Fee Related
-
1991
- 1991-07-12 EP EP91111644A patent/EP0467230B1/en not_active Expired - Lifetime
- 1991-07-12 AT AT91111644T patent/ATE128760T1/en not_active IP Right Cessation
- 1991-07-12 DE DE59106613T patent/DE59106613D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ATE128760T1 (en) | 1995-10-15 |
| DE4022561C1 (en) | 1992-02-27 |
| DE59106613D1 (en) | 1995-11-09 |
| EP0467230A1 (en) | 1992-01-22 |
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