DE561921C - Process for melting tantalum into high-melting insulating materials, especially quartz - Google Patents

Process for melting tantalum into high-melting insulating materials, especially quartz

Info

Publication number
DE561921C
DE561921C DES96514D DES0096514D DE561921C DE 561921 C DE561921 C DE 561921C DE S96514 D DES96514 D DE S96514D DE S0096514 D DES0096514 D DE S0096514D DE 561921 C DE561921 C DE 561921C
Authority
DE
Germany
Prior art keywords
tantalum
melting
insulating materials
quartz
especially quartz
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
DES96514D
Other languages
German (de)
Inventor
Dr Emil Duhme
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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
Application filed by Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Priority to DES96514D priority Critical patent/DE561921C/en
Application granted granted Critical
Publication of DE561921C publication Critical patent/DE561921C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
    • C03C27/02—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing by fusing glass directly to metal

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Description

Verfahren zum Einschmelzen von Tantal in hochschmelzende Isolierstoffe, insbesondere in Quarz Das Einschmelzen von Tantal in Quarz bereitet bekanntermaßen aus dem Grunde bisher sehr erhebliche Schwierigkeiten, weil bei der zum Einschmelzen notwendigen hohen Temperatur das Tantal die Neigung hat, Wasserstoffe zu okkludieren. Infolgedessen werden die mit den bekannten Verfahren erzielten Einschmelzstellen häufig durch Gasblasenbildung undicht.Process for melting tantalum into refractory insulating materials, in particular in quartz The melting of tantalum in quartz is known to prepare for the reason so far very significant difficulties because of the meltdown necessary high temperature, the tantalum has a tendency to occlude hydrogen. As a result, the melt-down points achieved with the known methods often leaking due to the formation of gas bubbles.

Die Erfindung betrifft ein einfaches Verfahren, welches diese Übelstände beseitigt. Gemäß der Erfindung wird das einzuschmelzende Tantal vorher durch elektrochemische Polarisation mit einer Schicht, die entsprechend der Formierungsspannung beliebig stark hergestellt werden kann, versehen. Unter elektrochemischer Polarisation des Tantals ist das Eintauchen des mit dem positiven Pol einer Gleichstromquelle oder einem Pol einer Wechselstromquelle verbundenen Tantals in einen wäßrigen, zur Erzeugung einer Schutzschicht auf dem Tantal geeigneten Elektrolyten, insbesondere Schwefelsäure, Chromsäure o. dgl., zu verstehen, in welchen gleichzeitig eine zweite, an den negativen Pol der Gleichstrom- oder an den anderen Pol der Wechselstromquelle angelegte Elektrode eintaucht. Das so vorbehandelte Tantal läßt sich dann ohne irgendwelche Schwierigkeiten in Quarz oder andere hochschmelzende Isolierstoffe gasdicht einschmelzen.The invention relates to a simple method which eliminates these inconveniences eliminated. According to the invention, the tantalum to be melted is previously by electrochemical Polarization with a layer that is arbitrary according to the formation voltage can be made strong, provided. Under electrochemical polarization of the Tantalum is the immersion of the positive pole of a DC power source or tantalum connected to one pole of an alternating current source into an aqueous one for generation a protective layer on the tantalum suitable electrolytes, in particular sulfuric acid, Chromic acid o. The like. To understand in which at the same time a second, to the negative Pole of the direct current or electrode connected to the other pole of the alternating current source immersed. The tantalum pretreated in this way can then be used without any difficulties melt in quartz or other high-melting insulating materials in a gas-tight manner.

Das neue Verfahren läßt sich besonders gut dann durchführen, wenn das Tantal in Form von dünnen Werkstücken zur Anwendung gelangt, vorzugsweise solchen, die eine Stärke unter 2o ,u haben. Ausführungsbeispiel Ein Tantalblech von etwa i cm Breite und io,u Stärke wird zunächst in einer-normalen Schwefelsäurelösung unter Anwendung einer Badspannung von etwa 9o Volt mit Gleichstrom anodisch polarisiert unter Anwendung eines Platin- oder eines Eisenbleches als Kathode: Nach einigen Sekunden bildet sich auf dem Tantalblech eine Anlauffarbe, deren Färbung von der verwendeten Badspannung abhängig ist.The new method can be carried out particularly well when the tantalum is used in the form of thin workpieces, preferably those which have a strength below 2o, u. Embodiment A tantalum sheet of about i cm width and io, u strength is first in a normal sulfuric acid solution anodically polarized using a bath voltage of about 90 volts with direct current using a platinum or iron sheet as a cathode: according to some Seconds, a tarnish color forms on the tantalum sheet, the color of which differs from the used bath voltage is dependent.

Das so vorbehandelte Tantalblech läßt sich dann nach vorhergehender Erhitzung im Vakuum gasdicht in Quarz einschmelzen mit. Hilfe eines geeigneten Gebläses.The tantalum sheet pretreated in this way can then be used according to the preceding Heating in a vacuum to melt gas-tight in quartz with. With the help of a suitable blower.

Gewünschtenfalls kann man für die Vorbehandlung des Tantals auch Wechselstrom verwenden.If desired, alternating current can also be used for the pretreatment of the tantalum use.

Es empfiehlt sich, bei der elektrochemischen Polarisation des Tantals Säuren, insbesondere Schwefelsäure, Chromsäure o. dgl., von geringer Konzentration anzuwenden, da bekannterweise die Ausbildung der Oxydschicht eine Funktion der Konzentration ist.It is advisable to use the electrochemical polarization of the tantalum Acids, in particular sulfuric acid, chromic acid or the like, of low concentration to apply, as is known the formation of the oxide layer Function of concentration is.

Claims (3)

PATENTANSPRÜCHE: i. Verfahren zum Einschmelzen von Tantal in hochschmelzende Isolierstoffe, insbesondere in Quarz, dadurch gekennzeichnet, daß das Tantal vor dem Einschmelzen elektrochernischpolarisiert wird. PATENT CLAIMS: i. Method for melting tantalum into refractory insulating materials, in particular in quartz, characterized in that the tantalum is electrochemically polarized before melting. 2. Verfahren nach Anspruch r, dadurch gekennzeichnet, daß für die elektrochemische Polarisation des Tantals dieses anodisch geschaltet in einem sauren Bad behandelt wird. 2. Procedure according to Claim r, characterized in that for the electrochemical polarization of the Tantalum this anodically connected is treated in an acid bath. 3. Verfahren nach Anspruch i oder 2, dadurch gekennzeichnet, daß für die elektrochemische Polarisation als Säure vornehmlich Schwefelsäure von geringer Konzentration zur Anwendung kommt.3. Procedure according to claim i or 2, characterized in that for the electrochemical polarization the acid used is primarily sulfuric acid in a low concentration.
DES96514D 1931-02-01 1931-02-01 Process for melting tantalum into high-melting insulating materials, especially quartz Expired DE561921C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES96514D DE561921C (en) 1931-02-01 1931-02-01 Process for melting tantalum into high-melting insulating materials, especially quartz

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES96514D DE561921C (en) 1931-02-01 1931-02-01 Process for melting tantalum into high-melting insulating materials, especially quartz

Publications (1)

Publication Number Publication Date
DE561921C true DE561921C (en) 1932-10-19

Family

ID=7520127

Family Applications (1)

Application Number Title Priority Date Filing Date
DES96514D Expired DE561921C (en) 1931-02-01 1931-02-01 Process for melting tantalum into high-melting insulating materials, especially quartz

Country Status (1)

Country Link
DE (1) DE561921C (en)

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