DE927584C - Cylindrical supply cathode, especially for a magnetron tube - Google Patents

Cylindrical supply cathode, especially for a magnetron tube

Info

Publication number
DE927584C
DE927584C DEN6394A DEN0006394A DE927584C DE 927584 C DE927584 C DE 927584C DE N6394 A DEN6394 A DE N6394A DE N0006394 A DEN0006394 A DE N0006394A DE 927584 C DE927584 C DE 927584C
Authority
DE
Germany
Prior art keywords
cathode
molybdenum
porous
tube
niobium
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
DEN6394A
Other languages
German (de)
Inventor
George Andrew Espersen
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of DE927584C publication Critical patent/DE927584C/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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/04—Cathodes
    • H01J23/05—Cathodes having a cylindrical emissive surface, e.g. cathodes for magnetrons
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12479—Porous [e.g., foamed, spongy, cracked, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12576—Boride, carbide or nitride component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12611—Oxide-containing component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
    • Y10T428/12826—Group VIB metal-base component
    • Y10T428/1284—W-base component

Description

Die Erfindung- bezieht sich auf eine Zylinderkathode, deren Außenoberfläche aus" einem porösen hochschmelzenden Metall, wie Wolfram, Molybdän, Hafnium, Tantal oder Niob, besteht, wobei das poröse Metall den Abschluß eines Erdalkalimetallverbindungen enthaltenden Vorratsraumes bildet.The invention relates to a cylindrical cathode, the outer surface of which is made of "a porous refractory metal such as tungsten, molybdenum, Hafnium, tantalum or niobium, consists, the porous metal being terminated by an alkaline earth metal compound containing storage space forms.

Kathoden der obenerwähnten Art sind bereits bekannt. In Magnetronröhren müssen solche Kathoden hohen Anforderungen hinsichtlich der Temperaturbeständigkeit im Zusammenhang mit den· hohen Stromdichten und dem in diesen Röhren auftretenden schweren Elektronenbombardement entsprechen. . . . .Cathodes of the type mentioned above are already known. Such cathodes must be used in magnetron tubes high requirements in terms of temperature resistance in connection with the high current densities and the heavy electron bombardment that occurs in these tubes. . . . .

Die Erfindung bezweckt, eine Kathode zu schaffen, die in dieser Hinsicht hohen Anforderungen entspricht. The aim of the invention is to create a cathode that meets high requirements in this regard is equivalent to.

Eine am der Außenoberfläche aus einem porösen hochschmelzenden Metall, wie Wolfram, Molybdän, Hafnium, Tantal oder Niob, bestehende Zylinderkathode, bei welcher der poröse Körper den Abschluß eines Erdalkalimetallverbindungen enthaltenden Vorratsraumes· bildet, besteht nach der Erfindung aus einem Zylindenrohr aus· Molybdän, welches über einen Teil seiner Länge einen kkinenan Außendurchmesser besitzt, so daß zwischen diesem Teil und dem das Rohr umgebenden porösen Metallkörper ein Vorrats raum gebildet ist; über die Enden des Molybdänrohrs sind schwere Molybdänringe gepreßt, die durch . eine; Dlitffusionsschweißung mit dem porösen Metallkörper verbunden sind.One on the outer surface of a porous refractory metal such as tungsten, molybdenum, hafnium, tantalum or niobium, existing cylinder cathodes, in which the porous body is terminated by an alkaline earth metal compound Forms the storage space, consists according to the invention of a cylinder tube made of molybdenum, which has a kkinenan outer diameter over part of its length, so that between this part and the porous metal body surrounding the tube, a storage space is formed; above the ends of the molybdenum tube are heavy molybdenum rings pressed through. one; Diffusion welding are connected to the porous metal body.

Die Erfindung wird an Hand der eine Kathode nach der Erfindung für eine Magnetronröhre darstellenden Zeichnung näher erläutert.The invention is illustrated by means of a cathode according to the invention for a magnetron tube Drawing explained in more detail.

In der Figur ist 10 die Kathode und 11 der die Kathode 10 umgebende Anodenblock. Polschuhe 12 und 13 dienen zur Erzeugung eines Magnetfeldes. Zwei Metallrohre 14 und 15 sind mittels Keramikplatten 16 und 17 vakuumdicht in Bohrungen der Polschuhe angebracht. Der Anodenblock besitzt mehriere Hohlräume, welche der Kathode gegenüber geöffnet sind.In the figure, 10 is the cathode and 11 is the cathode Cathode 10 surrounding anode block. Pole shoes 12 and 13 are used to generate a magnetic field. Two metal pipes 14 and 15 are vacuum-tight by means of ceramic plates 16 and 17 in the holes Pole shoes attached. The anode block has several cavities, facing the cathode are open.

Die Kathode 10 besteht aus einem porösen WoIframzylinder 18, der auf das Molybdänrohr 19 auf-The cathode 10 consists of a porous WoIframylinder 18, which on the molybdenum tube 19

geschoben ist. Der Mittelteil des Rohres 19 ist abgedreht, so daß eine Höhlung 20 entstanden ist. Die Höhlung ist mit Bariumkarbonat 21 gefüllt. Das Molybdänrohr enthält einen Glühdnaht 22, der mittels einer Aluminiumoxydschicht isoliert ist.is pushed. The middle part of the tube 19 is turned off, so that a cavity 20 has arisen. The cavity is filled with barium carbonate 21. That Molybdenum tube contains a glow seam 22 which is insulated by means of an aluminum oxide layer.

Die Glühdrahtenden 23 und 24 sind durch die Metallrohre 14 und 15 hindurch nach außen geführt. Schwere Ringe 26 und 27 aus Molybdän sind um die.Enden des Rohres 19.gepreßt, wobei sich zwischen den Ringen 26 und 27 und dem porösen Körper 18 jeweils Folien 28 und 29 aus Metall mit einem verhältnismäßig niedrigen Schmelzpunkt, z. B. Platin, Titan, Zirkon oder Thorium, befinden.The filament ends 23 and 24 are through Metal pipes 14 and 15 passed through to the outside. Heavy rings 26 and 27 are made of molybdenum around die.Ends of the tube 19. pressed, with between the rings 26 and 27 and the porous body 18 in each case foils 28 and 29 made of metal a relatively low melting point, e.g. B. platinum, titanium, zirconium or thorium are located.

Die Ringe 26 und 27 werden unter einem so hohen Druck gegen den Wolftramkörper 19 gepreßt, daß bereits bei einer Temperatur, welche niedriger liegt als der Schmelzpunkt der zwischenliegenden Folie, eine Diffusion derselben in die angrenzenden Metalle auftritt, so daß eine gut haftende Verbindung entsteht. Der Wolfnamzylinder 18 ist mit einer dünnen Schicht 30 aus temperaturbeständigem Material, wiie einem Oxyd, Nitrid oder Borid von Thorium, Ziirkoo, Niob oder Kobalt, überdeckt zwecks Erhöhung der Sekundäremission.The rings 26 and 27 are pressed against the Wolftram body 19 under such a high pressure that already at a temperature which is lower than the melting point of the film in between, diffusion of the same into the adjacent metals occurs, so that a well-adhering connection occurs arises. The Wolfnam cylinder 18 is with a thin layer 30 of temperature-resistant material, such as an oxide, nitride or boride of Thorium, Ziirkoo, niobium or cobalt, covered in order to increase the secondary emission.

Um zu vermeiden, daß ein zu großer Elektronenstrotn von der Kathode zu den Polschuhen fließt, sind Schirme 31 und 32 von niahezu konischer F"arm angebracht.In order to avoid an excessive electron beam Flows from the cathode to the pole pieces, screens 31 and 32 are almost conical F "arms appropriate.

Claims (3)

Patentansprüche:Patent claims: 1. Zylinderkathode, insbesondere für eine Magnetronröhre, welche an der Außenoberfläche aus einem porösen hochschmelzenden Metall, wie Wolfram, Molybdän, Hafnium, Tantal oder Niob, besteht, wobei dar poröse Körper den Abschluß eines Erdalkalimetallverbindungen enthaltenden Vorratsraumes bildet, dadurch gekennzeichnet, daß die Kathode aus einem Zylinderrohr aus Molybdän besteht, welches über einen Teil seiner Länge einen kleineren Außendurchmesser besitzt, so daß zwischen diesem Teil und dem das Rohr umgebenden porösen Metallköirper ein Vorratsraum entstanden ist, und daß über die Enden des Molybdänrohres schwere Molybdänringe gepreßt sind, welche durch eine Diffusions schweißung mit dem porösen Metallkörper verbunden sind.1. Cylinder cathode, especially for a magnetron tube, which is attached to the outer surface made of a porous refractory metal such as tungsten, molybdenum, hafnium, tantalum or Niobium, with the porous body terminating in an alkaline earth metal compound containing storage space, characterized in that the cathode consists of a cylindrical tube consists of molybdenum, which has a smaller outer diameter over part of its length possesses, so that a storage space has arisen between this part and the porous metal body surrounding the pipe, and that heavy molybdenum rings are pressed over the ends of the molybdenum tube, which are connected to the porous metal body by a diffusion weld. 2. Kathode nach Anspruch 1, dadurch gekennzeichnet, daß an den die Kathode tragenden 95: Mietallrohren komische Schirme mit der Kathode zugewendeten Öffnungen angebracht sind.2. Cathode according to claim 1, characterized in that that on the 95: Mietallrohrs carrying the cathode weird screens with the cathode facing openings are attached. 3. Kathode nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß auf dem porösen Metallkörper eine dünne Schicht eines temperatur- loo beständigen Materials mit guter Sekundäremissionsfähigkeit, wie ein Oxyd, Boirid oder Nitrid von .Thorium, Zirkon, Niob oder Kobalt, angebracht ist.3. Cathode according to claim 1 or 2, characterized in that on the porous metal body a thin layer of a temperature loo resistant material with good secondary emissivity, such as an oxide, boirid or Nitride of .thorium, zirconium, niobium or cobalt, is appropriate.
DEN6394A 1951-11-29 1952-11-25 Cylindrical supply cathode, especially for a magnetron tube Expired DE927584C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US258875A US2698913A (en) 1951-11-29 1951-11-29 Cathode structure

Publications (1)

Publication Number Publication Date
DE927584C true DE927584C (en) 1955-05-12

Family

ID=22982500

Family Applications (1)

Application Number Title Priority Date Filing Date
DEN6394A Expired DE927584C (en) 1951-11-29 1952-11-25 Cylindrical supply cathode, especially for a magnetron tube

Country Status (7)

Country Link
US (1) US2698913A (en)
BE (1) BE515835A (en)
CH (1) CH307780A (en)
DE (1) DE927584C (en)
ES (1) ES206486A1 (en)
FR (1) FR1073995A (en)
GB (1) GB716412A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1075747B (en) * 1960-02-18 Deutsche Elektronik G.m.b.H., Berlin-Wilmersdorf Cylindrical supply cathode for magnetrons
DE974430C (en) * 1952-10-04 1960-12-22 Telefunken Gmbh Low-noise, indirectly heated rapid heating cathode for electron tubes

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL183830B (en) * 1953-12-22 Unilever Nv PROCESS FOR THE PREPARATION OF AEROSOL PRODUCTS AND AN AEROSOL FILLED WITH THEM.
US2873217A (en) * 1954-05-20 1959-02-10 Ets Claude Paz & Silva Method for manufacturing a hollow electron-emissive electrode
US2844868A (en) * 1954-06-01 1958-07-29 Sylvania Electric Prod Method of joining refractory metals
NL94233C (en) * 1954-12-06
NL210138A (en) * 1955-04-30
US2822302A (en) * 1956-01-16 1958-02-04 Radio Mfg Company Inc Non-emissive electrode
US2882587A (en) * 1956-12-10 1959-04-21 Raytheon Mfg Co Brazing methods
US2957100A (en) * 1957-08-27 1960-10-18 Philips Corp Magnetron cathode structure
US3046444A (en) * 1959-04-28 1962-07-24 Raytheon Co Magnetrons
US3113236A (en) * 1959-06-23 1963-12-03 Philips Corp Oxide dispenser type cathode
US3224071A (en) * 1960-03-14 1965-12-21 Philips Corp Brazing method for porous bodies
US3107422A (en) * 1961-05-16 1963-10-22 Bendix Corp Rhodium diffusion process for bonding and sealing of metallic parts
US3132928A (en) * 1962-02-26 1964-05-12 Donald D Crooks Simultaneous brazing and corrosion protecting refractory metals
US3241230A (en) * 1962-10-12 1966-03-22 Roy I Batista Diffusion bonding of tungsten to tungsten
US3297901A (en) * 1964-06-05 1967-01-10 Litton Industries Inc Dispenser cathode for use in high power magnetron devices
US3431631A (en) * 1964-12-11 1969-03-11 Sylvania Electric Prod Refractory metal diffusion bonding
US3410716A (en) * 1965-04-01 1968-11-12 Trw Inc Coating of refractory metals with metal modified oxides
GB1093136A (en) * 1965-08-27 1967-11-29 Johnson Matthey Co Ltd Improvements in and relating to the bonding together of metals or alloys
US3487536A (en) * 1966-02-24 1970-01-06 Teledyne Inc Method of forming a high temperature ceramic-to-metal seal
NL8200903A (en) * 1982-03-05 1983-10-03 Philips Nv METHOD FOR DRILLING A SUPPLY CATHOD.

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US1267827A (en) * 1914-11-06 1918-05-28 Gen Electric Electric discharge device.
US2121589A (en) * 1934-06-28 1938-06-21 Westinghouse Electric & Mfg Co Emissive incandescent cathode
US2131204A (en) * 1936-01-15 1938-09-27 Siemens Ag Indirectly heated thermionic cathode
US2411601A (en) * 1941-09-30 1946-11-26 Raytheon Mfg Co Electronic discharge device
US2381012A (en) * 1942-01-03 1945-08-07 Raytheon Mfg Co Secondary electron discharge device
US2460119A (en) * 1944-09-23 1949-01-25 Gen Electric Magnetron
NL69486C (en) * 1947-11-26

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1075747B (en) * 1960-02-18 Deutsche Elektronik G.m.b.H., Berlin-Wilmersdorf Cylindrical supply cathode for magnetrons
DE974430C (en) * 1952-10-04 1960-12-22 Telefunken Gmbh Low-noise, indirectly heated rapid heating cathode for electron tubes

Also Published As

Publication number Publication date
GB716412A (en) 1954-10-06
FR1073995A (en) 1954-09-30
BE515835A (en)
US2698913A (en) 1955-01-04
ES206486A1 (en) 1953-01-16
CH307780A (en) 1955-06-15

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