DE443936C - Process for the production of connection contacts on non-metallic electrical heating and resistance bars - Google Patents

Process for the production of connection contacts on non-metallic electrical heating and resistance bars

Info

Publication number
DE443936C
DE443936C DEE31659D DEE0031659D DE443936C DE 443936 C DE443936 C DE 443936C DE E31659 D DEE31659 D DE E31659D DE E0031659 D DEE0031659 D DE E0031659D DE 443936 C DE443936 C DE 443936C
Authority
DE
Germany
Prior art keywords
production
electrical heating
connection contacts
metallic electrical
resistance bars
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
DEE31659D
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.)
ELEKTRO CHROM GmbH
Original Assignee
ELEKTRO CHROM GmbH
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 ELEKTRO CHROM GmbH filed Critical ELEKTRO CHROM GmbH
Priority to DEE31659D priority Critical patent/DE443936C/en
Application granted granted Critical
Publication of DE443936C publication Critical patent/DE443936C/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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders

Landscapes

  • Contacts (AREA)

Description

Verfahren zur Herstellung von Anschlußkontakten an nichtmetallischen elektrischen Heiz- und Widerstandsstäben. Es ist bekannt, daß die nichtmetallischen Heiz- undWiderstandsstäbe an den Anschlußenden große Übergangswiderstände zeigen. Man hat diesen Übelstand dadurch zu beseitigen versucht, daß man die Übergangswiderstände mit dünnen Metallschichten überzog. Dieses Mittel vermag jedoch nur dann seinen Zweck zu erfüllen, wenn als Metall ein Material verwendet wird, welches bei hohen Temperaturen schwer schmelzbar ist und somit einen gleichbleibenden Übergangswiderstand gewährleistet; als solches Material ist u. a. Chrom vorgeschlagen worden, wobei das Material auf mechanischem oder galvanischem Wege auf den Heiz- oder Widerstandsstab gebracht werden soll. Es hat sich nun gezeigt, daß der Ausführung dieser Erfindung unüberwindliche Schwierigkeiten im Wege stehen, welche einmal darin bestehen, daß das Chrom infolge seiner Härte und Sprödigkeit nicht aufgebracht oder überhaupt irgendwie mechanisch bearbeitet werden kann und andererseits, daß es nicht möglich ist, das Chrom galvanisch auf Kohle oder Graphit, infolge der dazu erforderlichen hohen Überspannung, aufzutragen.Process for the production of connection contacts on non-metallic electric heating and resistance rods. It is known that the non-metallic Heating and resistance rods show large contact resistances at the connection ends. Attempts have been made to remedy this disadvantage by removing the contact resistances covered with thin layers of metal. This means, however, can only be his To fulfill the purpose if a material is used as the metal, which at high Temperatures is difficult to melt and thus a constant contact resistance guaranteed; as such material is i.a. Chromium has been suggested, being the material mechanically or galvanically on the heating or resistance rod should be brought. It has now been found that practicing this invention insurmountable difficulties stand in the way, which consist in the fact that the chrome is not applied or at all due to its hardness and brittleness somehow can be machined and on the other hand that it is not possible is, the chromium is electroplated on carbon or graphite, as a result of the necessary high overvoltage.

Die vorliegende Erfindung besteht nun darin, daß das Chrom durch irgendein, an sich bekanntes, Reduktionsverfahren aus Oxyden oder sonstigen Verbindungen des Chroms, nötigenfalls unter Glühen in einer Atmosphäre von reduzierenden Gasen, aufgetragen wird, oder das Chrom galvanisch, unter Zuhilfenahme eines anderen Metalles als Unterlage, auf den Heiz- oder Widerstandsstab niedergeschlagen wird, wobei die Unterlage selbst galvanisch oder auf eine mechanische Weise auf dem Widerstandsstab angebracht wird. Als solche Zwischenmetalle kommen Kupfer, Eisen, Nickel, Kobalt, Silber u. dgl. in Betracht.The present invention consists in the fact that the chromium is known reduction process from oxides or other compounds of the Chromium, if necessary while glowing in an atmosphere of reducing gases is, or the chrome is electroplated, with the help of another metal as a base, is deposited on the heating or resistance rod, the pad itself is galvanically or mechanically attached to the resistance rod. Such intermediate metals are copper, iron, nickel, cobalt, silver and the like. into consideration.

Das für Chrom Gesagte gilt in gleicher Weise für die Metalle Tantal, Wolfram, Molybdän, Vanadin u. dgl.What has been said for chromium applies equally to the metals tantalum, Tungsten, molybdenum, vanadium and the like

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Anschlußkontakten aus schwer schmelzbarem Metall an nichtmetallischen elektrischen Heiz- und Widerstandsstäben, dadurch gekennzeichnet, daß der Überzug durch Reduktion der betreffenden Metallsalze bzw. -oxyde oder bei galvanischer Herstellung unter Zuhilfenahme einer Zwischenschicht eines auf Kohle oder Graphit leicht abscheidbaren anderen Metalles angebracht wird. PATENT CLAIM: A process for the production of connection contacts made of difficult-to-melt metal on non-metallic electrical heating and resistance rods, characterized in that the coating is produced by reducing the metal salts or oxides in question or, in the case of galvanic production, with the aid of an intermediate layer of another easily separable on carbon or graphite Metal is attached.
DEE31659D 1924-11-29 1924-11-29 Process for the production of connection contacts on non-metallic electrical heating and resistance bars Expired DE443936C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEE31659D DE443936C (en) 1924-11-29 1924-11-29 Process for the production of connection contacts on non-metallic electrical heating and resistance bars

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEE31659D DE443936C (en) 1924-11-29 1924-11-29 Process for the production of connection contacts on non-metallic electrical heating and resistance bars

Publications (1)

Publication Number Publication Date
DE443936C true DE443936C (en) 1927-05-12

Family

ID=7075199

Family Applications (1)

Application Number Title Priority Date Filing Date
DEE31659D Expired DE443936C (en) 1924-11-29 1924-11-29 Process for the production of connection contacts on non-metallic electrical heating and resistance bars

Country Status (1)

Country Link
DE (1) DE443936C (en)

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