[go: up one dir, main page]

DE496888C - Electron-active layer on cathodes of discharge vessels - Google Patents

Electron-active layer on cathodes of discharge vessels

Info

Publication number
DE496888C
DE496888C DEH96429D DEH0096429D DE496888C DE 496888 C DE496888 C DE 496888C DE H96429 D DEH96429 D DE H96429D DE H0096429 D DEH0096429 D DE H0096429D DE 496888 C DE496888 C DE 496888C
Authority
DE
Germany
Prior art keywords
cathodes
electron
active layer
discharge vessels
fluoride
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
DEH96429D
Other languages
German (de)
Inventor
Dr H J Spanner
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.)
Dr Erich F Huth GmbH
Original Assignee
Dr Erich F Huth 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 Dr Erich F Huth GmbH filed Critical Dr Erich F Huth GmbH
Priority to DEH96429D priority Critical patent/DE496888C/en
Priority to GB637925A priority patent/GB230492A/en
Application granted granted Critical
Publication of DE496888C publication Critical patent/DE496888C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/14—Solid thermionic cathodes characterised by the material

Landscapes

  • Discharge Lamp (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Gas-Filled Discharge Tubes (AREA)

Description

DEUTSCHES REICHGERMAN EMPIRE

AUSGEGEBEN AM 29. APRIL 1930ISSUED ON April 29, 1930

REICHSPATENTAMTREICH PATENT OFFICE

PATENTSCHRIFTPATENT LETTERING

KLASSE 21 g GRUPPECLASS 21 g GROUP

Dr. Erich F. Huth G. m. b. H. in Berlin*)Dr. Erich F. Huth G. m. B. H. in Berlin *)

Patentiert im Deutschen Reiche vom 8. März 1924 abPatented in the German Empire on March 8, 1924

Ein großer Übelstand bei der Herstellung von Oxydkathoden zur technischen Verwendung besteht darin, daß man trotz schwierigster Manipulationen keine harten Überzüge in beliebiger Dicke erhalten kann. So hat man sich bemüht, die in Breiform angerührten aktiven Oxyde oder organischen Verbindungen derselben, welche sich beim Erhitzen in die Oxyde zersetzen, z. B. schichtweise in annähernd 20 Schichten aufzutragen und einzeln festzubrennen, um einigermaßen feste Überzüge zu erhalten.A major drawback in the manufacture of oxide cathodes for technical use consists in the fact that, despite the most difficult manipulations, hard coatings of any thickness cannot be obtained. So had Efforts are made to mix the active oxides or organic compounds in pulp form the same, which decompose into the oxides when heated, e.g. B. in layers in Apply approximately 20 coats and bake them individually to make them reasonably firm To obtain coatings.

Die Überzüge konnten aber auch bei Verwendung organischer Verbindungen durch die Herausverdampfung von blasenbildenden Gasen (Kohlenwasserstoffen) nicht ganz fest werden. Gemäß der vorliegenden Erfindung wird dieses komplizierte Verfahren sehr vereinfacht und außerdem festgestellt, daß nochHowever, the coatings were also able to withstand the use of organic compounds the evaporation of bubble-forming gases (hydrocarbons) is not completely firm will. According to the present invention, this complicated process is greatly simplified and also found that still

ao andere Verbindungen der aktiven Metalle, welche sich nicht mehr im Hochvakuum zersetzen, für Elektronenemissionszwecke benutzt werden können. Erfindungsgemäß wird ein Oxyd in Pulverform mit einer Einschmelze von einer zweiten Substanz versehen, so daß hieraus eine harte Masse wird. Für Elektronenemissionszwecke verwendet man am besten für beide Substanzen aktive Materialien, z. B. Calciumoxyd als Pulver, dem man Bariumfluorid, welches bei einer Temperatur von etwa iooo0 C zerfließt, zusetzt. Das zugesetzte Bariumfluorid erzeugt einen festen porzellanartigen Überzug, der auf allen möglichen Trägerformen sehr fest und in großer Stärke haftet. Die Elektronenemission der angeführten Mischung aus Calciumoxyd und Bariumfluorid zeigt durch ihre Höhe den starken Einfluß des Bariumfluorids. ao other compounds of the active metals, which no longer decompose in a high vacuum, can be used for electron emission purposes. According to the invention, an oxide in powder form is provided with a melt of a second substance, so that it becomes a hard mass. For electron emission purposes it is best to use materials active for both substances, e.g. B. calcium oxide as a powder, to which barium fluoride, which dissolves at a temperature of about 100 0 C, is added. The added barium fluoride creates a solid, porcelain-like coating that adheres very firmly and in great strength to all possible carrier forms. The level of electron emission of the above mixture of calcium oxide and barium fluoride shows the strong influence of barium fluoride.

Claims (2)

Patentansprüche:Patent claims: 1. Elektronenaktive Schicht auf Kathoden von Entladungsgefäßen, dadurch gekennzeichnet, daß sie außer den bekannten Erdalkalioxyden noch Fluoride der Erdalkalien zusätzlich enthält.1. Electron-active layer on cathodes of discharge vessels, characterized in that that in addition to the well-known alkaline earth oxides, it also contains fluorides of alkaline earths. 2. Verfahren zur Herstellung von Kathoden nach Anspruch 1, dadurch gekennzeichnet, daß einem Oxyd der bekannten aktiven Metalle in Pulverform ein ebenfalls in Pulverform befindliches Fluorid der aktiven Metalle, z. B. Bariumfluorid, zugesetzt wird und beide, in Breiform auf den Träger aufgebracht, einer Temperatur ausgesetzt werden, bei der das Fluorid schmilzt.2. A method for the production of cathodes according to claim 1, characterized in that that an oxide of the known active metals in powder form is a fluoride also in powder form the active metals, e.g. B. barium fluoride, is added and both, in pulp form applied to the carrier, exposed to a temperature at which the fluoride melts.
DEH96429D 1924-03-08 1924-03-08 Electron-active layer on cathodes of discharge vessels Expired DE496888C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DEH96429D DE496888C (en) 1924-03-08 1924-03-08 Electron-active layer on cathodes of discharge vessels
GB637925A GB230492A (en) 1924-03-08 1925-03-09 Improvements in and relating to electric discharge vessels, tubes or the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH96429D DE496888C (en) 1924-03-08 1924-03-08 Electron-active layer on cathodes of discharge vessels

Publications (1)

Publication Number Publication Date
DE496888C true DE496888C (en) 1930-04-29

Family

ID=7167551

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH96429D Expired DE496888C (en) 1924-03-08 1924-03-08 Electron-active layer on cathodes of discharge vessels

Country Status (2)

Country Link
DE (1) DE496888C (en)
GB (1) GB230492A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2524001A (en) * 1948-05-19 1950-09-26 Raytheon Mfg Co Compressed cathode support structure

Also Published As

Publication number Publication date
GB230492A (en) 1926-06-03

Similar Documents

Publication Publication Date Title
DE496888C (en) Electron-active layer on cathodes of discharge vessels
DE1216499B (en) Enamel with a high dielectric constant applied to iron or iron alloys
DE537790C (en) Process for the production of coating compounds for oxide cathodes of electron tubes
DE60316133T2 (en) METHOD FOR PRODUCING A MOLYBEDENESILICIDE-TYPE HEATING ELEMENT
DE409799C (en) Process for the production of highly electron emitting coatings of alkaline earth oxides on glow cathodes
DE1671790B2 (en) Electrolyte carriers for fuel cells and process for their manufacture
DE603004C (en) Process for the pretreatment of rock phosphates for acid digestion
DE436440C (en) Manufacture of a bronze-based alloy with a high lead content, particularly suitable for bearings
DE637186C (en) Process for the production of acetaldehyde
DE420581C (en) Process for the production of materials which are able to emit electrons to a large extent when heated
DE2035415C3 (en) Acid-resistant, partially crystallized enamel
DE745978C (en) Process for the production of a very thin secondary emissive layer from alkali halides
DE864498C (en) Process for the production of moldings from mixtures of zinc chloride and ammonia
DE593516C (en) Process for the production of indirectly heated glow cathodes
DE488471C (en) Process for the production of a metal or metal alloy powder suitable for the preparation of dental amalgams
DE304912C (en)
AT120212B (en) Electron-emitting body and process for its manufacture.
DE507936C (en) Process for the production of chromium oxide that can be used as a color pigment
DE603387C (en) Process for obtaining ferronickel
DE407508C (en) Manufacture of rare and very high melting metals
DE460814C (en) Process for the production of acid-resistant putty compounds
DE727515C (en) Process for basic enamelling of iron objects using the wet enamelling process
DE595234C (en) Process for the production of contact bodies with high mechanical strength
DE682258C (en) Process for the preparation of a citric acid and ammonium citrate-soluble phosphate fertilizer
DE626140C (en) Process for the production of collector plates