GB319008A - Improvements in or relating to thermionic cathodes of vacuum electric tube devices - Google Patents

Improvements in or relating to thermionic cathodes of vacuum electric tube devices

Info

Publication number
GB319008A
GB319008A GB27379/29A GB2737929A GB319008A GB 319008 A GB319008 A GB 319008A GB 27379/29 A GB27379/29 A GB 27379/29A GB 2737929 A GB2737929 A GB 2737929A GB 319008 A GB319008 A GB 319008A
Authority
GB
United Kingdom
Prior art keywords
per cent
oxide
mixture
cathodes
magnesium silicate
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
GB27379/29A
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.)
Westinghouse Lamp Co
Original Assignee
Westinghouse Lamp Co
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 Westinghouse Lamp Co filed Critical Westinghouse Lamp Co
Publication of GB319008A publication Critical patent/GB319008A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/51—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on compounds of actinides
    • 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
    • H01J1/22—Heaters

Abstract

319,008. Westinghouse Lamp Co., (Assignees of Driggs, F. H.). Sept. 15, 1928, [Convention date]. Vacuum tubes. - Separately formed insulators contacting with heated metal in thermionic cathodes, and particularly for separating heaters from the hollow, metal surface of indirectly heated cathodes, are composed of a rare earth oxide mixed with 1-10 per cent of a refactory material of lower melting point not destroying the chemical inertness of the oxide but lowering the temperature at which the mixture unites and solidifies to just below 1600‹ C. A mixture of 95 per cent of thorium oxide and 5 per cent of artificially prepared, purified magnesium silicate may be ball milled dry, mixed with a binder such as a solution of nitrocellulose in amylacetate, extruded and fixed at 1800-1600‹ C. in a tungsten- or molybdenum-wound, hydrogen furnace. Instead of magnesium silicate, talc or mixtures of compounds of silica with magnesia and alumina may be used. Casein, agar agar, and paraffin may be used as binders. Insulators made from zirconia instead of thoria are referred to.
GB27379/29A 1928-09-15 1929-09-09 Improvements in or relating to thermionic cathodes of vacuum electric tube devices Expired GB319008A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US306291A US1826510A (en) 1928-09-15 1928-09-15 Refractory insulator for electron discharge devices

Publications (1)

Publication Number Publication Date
GB319008A true GB319008A (en) 1930-12-09

Family

ID=23184640

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27379/29A Expired GB319008A (en) 1928-09-15 1929-09-09 Improvements in or relating to thermionic cathodes of vacuum electric tube devices

Country Status (2)

Country Link
US (1) US1826510A (en)
GB (1) GB319008A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB900170A (en) * 1960-05-03 1962-07-04 Ass Elect Ind Improvements relating to indirectly heated cathodes
US3206329A (en) * 1962-01-08 1965-09-14 Gen Electric Insulation coating for indirectly heated cathode heaters
IT1144941B (en) * 1981-11-18 1986-10-29 Agip Nucleare Spa PREPARATION PROCEDURE FOR HIGH DESITY TABLETS OF NUCLEAR CERAMIC FUELS ADDED WITH SILICATES
US4869866A (en) * 1987-11-20 1989-09-26 General Electric Company Nuclear fuel
US4869868A (en) * 1987-11-23 1989-09-26 General Electric Company Nuclear fuel
US4869867A (en) * 1987-11-25 1989-09-26 General Electric Company Nuclear fuel
US5118983A (en) * 1989-03-24 1992-06-02 Mitsubishi Denki Kabushiki Kaisha Thermionic electron source

Also Published As

Publication number Publication date
US1826510A (en) 1931-10-06

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