DE880773C - Process for the production of insulation layers - Google Patents

Process for the production of insulation layers

Info

Publication number
DE880773C
DE880773C DEL6145A DEL0006145A DE880773C DE 880773 C DE880773 C DE 880773C DE L6145 A DEL6145 A DE L6145A DE L0006145 A DEL0006145 A DE L0006145A DE 880773 C DE880773 C DE 880773C
Authority
DE
Germany
Prior art keywords
layer
collodion
production
insulation layers
layers
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
DEL6145A
Other languages
German (de)
Inventor
Gabriele Dipl-Chem 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 DEL6145A priority Critical patent/DE880773C/en
Application granted granted Critical
Publication of DE880773C publication Critical patent/DE880773C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/08—Manufacture of heaters for indirectly-heated cathodes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (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, zur Verwendung beispielsweise an Heizwendeln von 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 use for example on heating coils of radio and cathode ray tubes.

Es ist allgemein üblich, die Isolationsschichten von Heizwendeln durch Sprühen mittels Sprühpistole oder durch Eintauchen in entsprechend zähflüsse Pasten herzustellen bzw. aufzubringen. Als Bindemittel dient dabei ein Zusatz von Nitrocellulose (Kollodiumlösung) oder ein etwa ioo/oiger Aluminiumnitratzusatz. Die Nitrocellulose hat den Nachteil, daß der bei dem Sinterprozeß zunächst entstehende Kohlenstoff evtl. vor seiner Verbrennung mit dem Wolframdraht der Wendel Karbide bilden kann. die die Bruchfestigkeit des Drahtes vermindern oder in die Schicht einwandern und dadurch den Isolationsschichtwiderstand herabsetzen. Ein Zusatz von A1 (NO")", der meistens bei etwa ioo/o liegt, hat den Nachteil, daß dadurch die Schichtisolation herabgesetzt wird, da diese Verbindung wegen der großen Wasserlöslichkeit nie den gleichen Reinheitsgrad erreichen kann wie A12(),.It is common practice to have heating coils through the insulation layers Spraying with a spray gun or by dipping into corresponding viscous pastes to produce or apply. Nitrocellulose is added as a binding agent (Collodion solution) or an approximately 100% aluminum nitrate additive. The nitrocellulose has the disadvantage that the carbon initially formed in the sintering process possibly the filament can form carbides with the tungsten wire before it is burned. which reduce the breaking strength of the wire or migrate into the layer and thereby reducing the insulation layer resistance. An addition of A1 (NO ")", the is usually around 100 per cent, has the disadvantage that it reduces the layer insulation is reduced, since this compound never denies because of its high solubility in water can achieve the same degree of purity as A12 () ,.

Erfindungsgemäß wird nun vorliegend ein Verfahren zur Herstellung von Heizwendelisolationsschichten beschrieben, bei dem auf den Heizdraht zuerst eine kollodiumfreie Schicht und darüber nochmals eine kollodiumhaltige Schicht aufgebracht wird. Dadurch wird eine schädliche Wolf ramkarbidbildung unmöglich gemacht, da der Wolframdraht durch die untere kollodiumfreie Schicht geschützt ist. Besondere Zusätze, deren Isolationsfähigkeit geringer ist als die des reinen Aluminiumoxyds A1203; sind nur in Konzentrationen von höchstens a, i °/o erforderlich.According to the present invention, there is now a method of production of electrofusion insulation layers, where on the heating wire first a collodion-free layer and then another layer containing collodions is applied will. This makes harmful tungsten carbide formation impossible, since the Tungsten wire is protected by the lower collodion-free layer. Special additives, whose insulation capacity is lower than that of pure aluminum oxide A1203; are only required in concentrations of at most a, i ° / o.

Der Herstellungsprozeß der erfindungsgemäßen Wendel ist sehr einfach. Die Wendel wird in ein A120.-Bad getaucht, welches A120., Kollodium, eine Reihe organischer Lösungsmittel, z. B. Aceton, Amylacetat oder Isopropylalkohol,. und einen i -bis io%@igen Zusatz einer Lösung von etwa i °/o Al . (N03)3 in Methanol enthält. Arbeitet die Wendel als negative Elektrode in diesem Bad, so überzieht sie sich mit einer kollodiumfreien Schicht von A1203, arbeitet sie als positive Elektrode, so wird -eine kollodiumhaltige Abscheidung erzielt. Man läßt also erfindungsgemäß die Wendel hintereinander als negative und als positive Elektrode in dem beschriebenen Bade arbeiten und erhält so die beiden erfindungsgemäß beabsichtigten Schichten übereinander auf der gleichen Wendel,The manufacturing process of the helix according to the invention is very simple. The coil is immersed in an A120. Bath, which A120., Collodion, a series organic solvent, e.g. B. acetone, amyl acetate or isopropyl alcohol. and an i-to io% addition of a solution of about i ° / o Al. (N03) 3 in methanol contains. If the filament works as a negative electrode in this bath, it is coated If they cover themselves with a collodion free layer of A1203, it works as a positive Electrode, a collodion-containing deposit is achieved. So you can according to the invention the filament one behind the other as a negative and a positive electrode in the one described Work in the bath and thus obtain the two layers intended according to the invention one above the other on the same spiral,

Claims (2)

PATENTANSPRÜCHE: i. Verfahren zur Herstellung von Isolationsschichten, dadurch gekennzeichnet, daß z. B. auf einer Heizwendel elektrophoretisch eire doppelte Isolationsschicht aufgebracht wird, wobei die erste Schicht frei von besonderen Bindemitteln ist und die zweite einen haftfesten, bindemittelhaltigen Überzug bildet. PATENT CLAIMS: i. Process for the production of insulation layers, characterized in that, for. B. electrophoretically double eire on a heating coil Isolation layer is applied, the first layer being devoid of special Binders is and the second forms an adhesive, binder-containing coating. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß die Abscheidung beider Schichten durch Eintauchen in ein und dasselbe Bad elektrophoretisch erfolgt, wobei die Heiz-. wendet bei dem Niederschlag der ersten Schicht als negative Elektrode" bei dem der zweiten Schicht als positive Elektrode geschaltet ist. 3: Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß das Bad Zuschläge enthält, welche ungleichartige Abscheidungen an Kathode und Anode bewirken, z. B. ein z- bis ioo/oiger Zusatz einer Lösung von ca. i % AI (NO.), in Methanol. 4.. Verfahren nach Anspruch i, 2 oder 3, dadurch gekennzeichnet, daß die kollodiumfreie und die kollodiumhaltige Schicht in dem gleichen Bad an zwei verschiedenen Wendelgruppen gleichzeitig abgeschieden wird, wobei die eine Gruppe mit dem positiven Pol, die andere mit dem negativen Pol verbunden wird. Angezogene Druckschriften: USA.-Patentschrift Nr. 2 307 0i8.2. The method according to claim i, characterized in that the deposition of both layers is carried out electrophoretically by immersion in one and the same bath, the heating. applies when the first layer is deposited as a negative electrode "in which the second layer is connected as a positive electrode A z- to 100% addition of a solution of approx. 1% Al (NO.) in methanol. 4 .. Process according to claim 1, 2 or 3, characterized in that the collodion-free and the collodion-containing layer are in the same Bath is deposited on two different groups of filaments at the same time, one group being connected to the positive pole and the other to the negative pole.
DEL6145A 1950-10-28 1950-10-29 Process for the production of insulation layers Expired DE880773C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL6145A DE880773C (en) 1950-10-28 1950-10-29 Process for the production of insulation layers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1044213X 1950-10-28
DEL6145A DE880773C (en) 1950-10-28 1950-10-29 Process for the production of insulation layers

Publications (1)

Publication Number Publication Date
DE880773C true DE880773C (en) 1953-06-25

Family

ID=25984976

Family Applications (1)

Application Number Title Priority Date Filing Date
DEL6145A Expired DE880773C (en) 1950-10-28 1950-10-29 Process for the production of insulation layers

Country Status (1)

Country Link
DE (1) DE880773C (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
DE1090774B (en) * 1959-03-20 1960-10-13 Siemens Ag Heating element for indirectly heated cathodes and process for the production of an insulating coating

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2307018A (en) * 1938-06-25 1943-01-05 Raytheon Production Corp Cataphoretic deposition of insulating coatings

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2307018A (en) * 1938-06-25 1943-01-05 Raytheon Production Corp Cataphoretic deposition of insulating coatings

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
DE1090774B (en) * 1959-03-20 1960-10-13 Siemens Ag Heating element for indirectly heated cathodes and process for the production of an insulating coating

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