GB1451234A - Dispersion alloy product - Google Patents

Dispersion alloy product

Info

Publication number
GB1451234A
GB1451234A GB4042473A GB4042473A GB1451234A GB 1451234 A GB1451234 A GB 1451234A GB 4042473 A GB4042473 A GB 4042473A GB 4042473 A GB4042473 A GB 4042473A GB 1451234 A GB1451234 A GB 1451234A
Authority
GB
United Kingdom
Prior art keywords
compact
thoria
particles
thorium
wire
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
GB4042473A
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.)
General Electric Co
Original Assignee
General Electric 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 General Electric Co filed Critical General Electric Co
Publication of GB1451234A publication Critical patent/GB1451234A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
    • B23K35/402—Non-consumable electrodes; C-electrodes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
    • C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
    • C22C32/0031—Matrix based on refractory metals, W, Mo, Nb, Hf, Ta, Zr, Ti, V or alloys thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/02—Incandescent bodies
    • H01K1/04—Incandescent bodies characterised by the material thereof
    • 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
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12021—All metal or with adjacent metals having metal particles having composition or density gradient or differential porosity

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Discharge Lamp (AREA)

Abstract

1451234 Thoria-W dispersion alloy GENERAL ELECTRIC CO 28 Aug 1973 [1 Sept 1972] 40424/73 Headings C7A and C7D A thermally treated and mechanically worked alloy member consisting of a recrystallized tungsten grain structure the crystals of which are minute equi-axed particles and 1 to 2 wt. per cent of thoria particles having a size smaller than the size of said tungsten particles and being distributed in a uniformly diminishing concentration gradient which has the maximum concentration located at the exterior surface of the alloy member and does not display a sharp variation of concentration of thoria particles along the concentration gradient is produced by soaking a porous compact of tungsten particles in an inert solvent for a thorium compound (e.g. distilled water) and then immersing the solvent filled compact in a solution of the thorium compound (e.g. thorium nitrate) for a sufficient time to permit diffusion of the thorium compound into the solvent contained in the pores of the compact, removing the compact from the solution and drying (e.g. in a vacuum oven at 130‹F) to retain a bulk thoria content of 1À9%. The compact may then be presintered at 1200‹C in hydrogen for 2 hours to convert the thorium nitrate to thoria and may be sintered by passing on electrical current therethrough. The compact may then be rolled, swaged, drawn to wire form and recrystallized by passing on electric current through the wire in a hydrogen atmosphere to maintain a temperature of 2650‹C for 6 hours. The wire product may be used as a filament for electric lamps and electronic tubes. REFERENCE HAS BEEN DIRECTED IN PERSUANCE OF SECTION 9, SUB SECTION (1) OF THE PATENTS ACT 1949, TO PATENT NO 1392837.
GB4042473A 1972-09-01 1973-08-28 Dispersion alloy product Expired GB1451234A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00285939A US3853491A (en) 1972-09-01 1972-09-01 Tungsten filament having uniform concentration gradient of thoria particles

Publications (1)

Publication Number Publication Date
GB1451234A true GB1451234A (en) 1976-09-29

Family

ID=23096340

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4042473A Expired GB1451234A (en) 1972-09-01 1973-08-28 Dispersion alloy product

Country Status (8)

Country Link
US (1) US3853491A (en)
JP (1) JPS559941B2 (en)
BE (1) BE804110A (en)
BR (1) BR7306820D0 (en)
DE (1) DE2343278C3 (en)
FR (1) FR2197994B1 (en)
GB (1) GB1451234A (en)
NL (1) NL7312096A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016446A (en) * 1975-01-31 1977-04-05 Westinghouse Electric Corporation Refractory-oxide-based incandescible radiators and method of making
US4086087A (en) * 1976-12-27 1978-04-25 Lisa Marie Morris Process for the preparation of powdered metal parts
DE3309069C1 (en) * 1983-03-14 1984-06-20 MTU Motoren- und Turbinen-Union München GmbH, 8000 München Electrode, especially for TIG welding processes
US5590386A (en) * 1995-07-26 1996-12-31 Osram Sylvania Inc. Method of making an alloy of tungsten and lanthana
JP5086503B2 (en) * 2001-02-02 2012-11-28 株式会社東芝 Method for manufacturing thorium tungsten wire
JP3640947B2 (en) * 2002-10-07 2005-04-20 株式会社東芝 Ion source, ion implantation apparatus, and method for manufacturing semiconductor device
WO2005073418A1 (en) * 2004-01-30 2005-08-11 Nippon Tungsten Co., Ltd. Tungsten based sintered compact and method for production thereof
US7648933B2 (en) 2006-01-13 2010-01-19 Dynamic Abrasives Llc Composition comprising spinel crystals, glass, and calcium iron silicate
JP5414828B2 (en) * 2012-04-12 2014-02-12 株式会社東芝 Thorium tungsten alloy, thorium tungsten wire, thorium tungsten wire coil, and cathode structure for electron tube

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1082933A (en) * 1912-06-19 1913-12-30 Gen Electric Tungsten and method of making the same for use as filaments of incandescent electric lamps and for other purposes.
US2798808A (en) * 1953-02-02 1957-07-09 Westinghouse Electric Corp Method of introducing zirconia into tungsten powder preliminary to forming electrodes
US2846339A (en) * 1953-10-21 1958-08-05 Honeywell Regulator Co Method of forming an electron emitting body
US3278281A (en) * 1957-09-13 1966-10-11 Westinghouse Electric Corp Thoriated tungsten filament or wire and method of making same
US3105290A (en) * 1958-12-18 1963-10-01 Westinghouse Electric Corp Cathode for electron discharge device
AT261237B (en) * 1963-11-20 1968-04-10 Egyesuelt Izzolampa Process for the production of metal bodies containing at least one additive and obtained by powder metallurgy
US3475159A (en) * 1967-01-16 1969-10-28 Dow Chemical Co Method for preparing tungsten powders doped with refractory metal oxides

Also Published As

Publication number Publication date
BE804110A (en) 1973-12-17
JPS4987167A (en) 1974-08-21
FR2197994A1 (en) 1974-03-29
DE2343278A1 (en) 1974-03-21
DE2343278B2 (en) 1978-07-20
FR2197994B1 (en) 1976-05-07
JPS559941B2 (en) 1980-03-13
US3853491A (en) 1974-12-10
NL7312096A (en) 1974-03-05
BR7306820D0 (en) 1974-06-27
DE2343278C3 (en) 1979-03-08

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee