DE854828C - Process for the production of insulation layers - Google Patents

Process for the production of insulation layers

Info

Publication number
DE854828C
DE854828C DEL6146A DEL0006146A DE854828C DE 854828 C DE854828 C DE 854828C DE L6146 A DEL6146 A DE L6146A DE L0006146 A DEL0006146 A DE L0006146A DE 854828 C DE854828 C DE 854828C
Authority
DE
Germany
Prior art keywords
production
insulation layers
addition
insulation
layer
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
DEL6146A
Other languages
German (de)
Inventor
Gabriele Landsberg
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.)
Loewe Opta GmbH
Original Assignee
Loewe Opta 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 Loewe Opta GmbH filed Critical Loewe Opta GmbH
Priority to DEL6146A priority Critical patent/DE854828C/en
Application granted granted Critical
Publication of DE854828C publication Critical patent/DE854828C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
    • H01J19/44—Insulation between electrodes or supports within the vacuum space

Landscapes

  • Solid Thermionic Cathode (AREA)

Description

Verfahren zur Herstellung von Isolationsschichten Die Erfindung richtet sich auf ein neuartiges Herstellungsverfahren von Isolationsschichten, z. B. für Heizwendeln, insbesondere aus Aluminium-, Magnesium- oder Berylliumoxyd, beispielsweise zur Verwendung an Heizwendeln für Rundfunk-und Kathodenstrahlröhren.Process for the production of insulation layers The invention is directed focus on a new manufacturing process for insulating layers, e.g. B. for Heating coils, in particular made of aluminum, magnesium or beryllium oxide, for example for use on heating coils for radio and cathode ray tubes.

Es ist allgemein üblich, die Isolationsschichten von HeizNvendeln durch Sprühen mittels Sprühpistole oder durch Eintauchen in entsprechend zähflüssige Pasten aufzubringen. Als Bindemittel dient dabei ein Zusatz von Nitrocellulose (Kollodiumlösung) oder ein etwa io%iger Aluminiumnitratzusatz. Die Nitrocellulose hat den Nachteil, daß der bei dem Sinterprozeß zunächst entstehende Kohlenstoff evtl. vor seiner Verbrennung mit dem Wolframdralit der Wendel Karbide bilden kann, die die Bruchfestigkeit des Drahtes vermindern oder in die Schicht einwandern und dadurch den Isolationsschichtwiderstand herabsetzen. Ein Zusatz von Al (NO,)" der meistens bei etwa ro% liegt, hat den Nachteil, daß dadurch die Schichtisolation herabgesetzt wird, da diese Verbindung wegen der großen Wasserlöslichkeit nie den gleichen Reinheitsgrad erreichen kann wie A'20..It is common practice to remove the insulating layers of heating panels by spraying with a spray gun or by immersing in appropriately viscous Apply pastes. An addition of nitrocellulose (collodion solution) serves as a binding agent. or an approximately 10% aluminum nitrate additive. The nitrocellulose has the disadvantage that the carbon initially formed during the sintering process may be before it is burned with the tungsten dralite the filament can form carbides, which increase the breaking strength of the Wire or migrate into the layer and thereby the insulation layer resistance reduce. An addition of Al (NO,) ", which is mostly around ro%, has the disadvantage that thereby the layer insulation is reduced, since this connection because of the high water solubility can never reach the same degree of purity as A'20 ..

Das erfindungsgemäße Verfahren besteht nun darin, daß als Bindemittel ein Zusatz von etwa 20% Al (0H)3 verwendet wird. Gegebenenfalls können auch Zuschläge anderer ähnlicher Hydroxvde zur Erzielung besonderer Schichteigenschaften gemacht werden, wie niedrige Sintertemperatur oder größere Scherbendichte, beispielsweise Mg (O H)2 oder Be(OH)2. Durch dieses Verfahren wird eine ausreichende Haftfestigkeit der Schicht erreicht dhne irgendwelche Qualitätsverminderung des Drahtes oder der Isolation. Darüber hinaus wird durch den A12 (O H)3-Zusatz die Anwendung des elektrophoretischen Verfahrens ermöglicht, vermittels dessen das hochgereinigte Isolationsmaterial ohne Zusatz irgendwelcher Art auf dem zu isolierenden Körper abgeschieden werden kann.The method according to the invention now consists in that as a binder an addition of about 20% Al (OH) 3 is used. If necessary, surcharges can also be used other similar hydroxide made to achieve special layer properties such as low sintering temperature or greater body density, for example Mg (O H) 2 or Be (OH) 2. This procedure provides sufficient adhesive strength the layer does not suffer any degradation of Wire or insulation. In addition, the addition of A12 (O H) 3 makes the Application of the electrophoretic process enables, by means of which the highly purified Insulation material without any kind of addition on the body to be insulated can be deposited.

Claims (3)

PATENTANSPRÜCHE: i. Verfahren zur Herstellung von Isolationsschichten, insbesondere aus Aluminium-, Magnesium- oder Berylliumoxyd, beispielsweise für Heizwendeln bei Rundfunk- und Kathodenstrahlröhren, dadurch gekennzeichnet, daß als Bindemittel Al (OH), verwendet wird. PATENT CLAIMS: i. Process for the production of insulation layers, in particular from aluminum, magnesium or beryllium oxide, for example for heating coils in radio and cathode ray tubes, characterized in that Al (OH) is used as the binding agent. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß Zusätze von anderen geeigneten Hydroxyden, z. B. von Mg(OH)2 oder Be (OH)" verwendet werden. 2. The method according to claim i, characterized in that that additions of other suitable hydroxides, e.g. B. of Mg (OH) 2 or Be (OH) "is used will. 3. Verfahren nach Anspruch,l oder 2, dadurch gekennzeichnet, daß das Aufbringen der Schicht auf elektrophoretischem 'Wege erfolgt.3. The method according to claim l or 2, characterized in that the application the layer takes place electrophoretic 'way.
DEL6146A 1950-10-29 1950-10-29 Process for the production of insulation layers Expired DE854828C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL6146A DE854828C (en) 1950-10-29 1950-10-29 Process for the production of insulation layers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL6146A DE854828C (en) 1950-10-29 1950-10-29 Process for the production of insulation layers

Publications (1)

Publication Number Publication Date
DE854828C true DE854828C (en) 1952-11-06

Family

ID=7257012

Family Applications (1)

Application Number Title Priority Date Filing Date
DEL6146A Expired DE854828C (en) 1950-10-29 1950-10-29 Process for the production of insulation layers

Country Status (1)

Country Link
DE (1) DE854828C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1045554B (en) * 1956-11-30 1958-12-04 Telefunken Gmbh Process for the production of an immersion and spray-proof, consisting of aluminum oxide insulating layer on a burner for indirectly heated glow cathodes
DE1160113B (en) * 1961-09-28 1963-12-27 Telefunken Patent Method for embedding a heating wire in a cathode sleeve for electron tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1045554B (en) * 1956-11-30 1958-12-04 Telefunken Gmbh Process for the production of an immersion and spray-proof, consisting of aluminum oxide insulating layer on a burner for indirectly heated glow cathodes
DE1160113B (en) * 1961-09-28 1963-12-27 Telefunken Patent Method for embedding a heating wire in a cathode sleeve for electron tubes

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