EP0439776B1 - Matériau en molybdène, en particulier pour la fabrication de lampes - Google Patents

Matériau en molybdène, en particulier pour la fabrication de lampes Download PDF

Info

Publication number
EP0439776B1
EP0439776B1 EP90124465A EP90124465A EP0439776B1 EP 0439776 B1 EP0439776 B1 EP 0439776B1 EP 90124465 A EP90124465 A EP 90124465A EP 90124465 A EP90124465 A EP 90124465A EP 0439776 B1 EP0439776 B1 EP 0439776B1
Authority
EP
European Patent Office
Prior art keywords
molybdenum
ppm
lamps
molybdenum material
aluminum
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 - Lifetime
Application number
EP90124465A
Other languages
German (de)
English (en)
Other versions
EP0439776A1 (fr
Inventor
Cosetta Dr. Setti
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0439776A1 publication Critical patent/EP0439776A1/fr
Application granted granted Critical
Publication of EP0439776B1 publication Critical patent/EP0439776B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum

Definitions

  • molybdenum material is to be understood as meaning materials that are used for various purposes in lamp construction.
  • the final product of molybdenum production which is initially available as a sintered rod, is then only further processed purely mechanically, so that nothing changes in the chemical composition.
  • the desired primary materials are created by rolling, hammering and drawing. More specifically, these processes initially produce pins or wires. Tubes or tape material for the film production are then in turn produced as a semi-finished product from wires or pins.
  • molybdenum material which is doped with at least one of the elements Al, Si, K in an amount of 50-7500 ppm (wt.). This can improve the recrystallization behavior of external power supplies for lamps.
  • Another task is to use only substances that are harmless to health when producing molybdenum material.
  • This positive property is achieved by adding 150-800 ppm by weight aluminum; particularly good results are achieved when using 400-600 ppm.
  • a very small amount of potassium, 5-50 ppm, is additionally used as doping to regulate the grain size.
  • Such a molybdenum material is particularly well suited as a holder wire in the lamp industry.
  • the area of application is primarily in the case of extremely high thermal and chemical loads, as occurs with certain types (PAR lamps, halogen lamps).
  • a PAR incandescent lamp with an output of 300 W may be mentioned as an exemplary embodiment.
  • the holders for the filament are made of molybdenum wire with a diameter of approx. 125 ⁇ m.
  • the molybdenum is doped with 500 ppm (wt.) Al and 15 ppm (wt.) K.
  • a molybdenum wire with a doping of 250 ppm aluminum and 15 ppm K may be mentioned as an example. Its constant elongation is around 3.5%.
  • the process for producing the molybdenum material is based on the Coolidge process (cf. C. Agte / J. Vacek, Wolfram and Molybdenum, Akademie-Verlag, Berlin, 1959, especially chap. 6):
  • the starting material for the production of the molybdenum products is, for example, MoO3 with a purity of 99.97% by weight.
  • Aluminum and a small amount of potassium are added to this oxide, which is in powder form, as a dopant.
  • the aluminum is added as nitrate (Al (NO3) 3).
  • Al (NO3) 3) nitrate
  • the subsequent two-stage reduction of the molybdenum oxide is carried out in a manner known per se using an H2 / N2 mixture and pure H2 gas.
  • a rotary kiln is advantageously used instead of a feed oven to be equipped with boats.
  • the MoO3 is reduced to Mo via MoO2 at temperatures of approx. 500-600 ° C (1st step) or 1000-1100 ° C (2nd step).
  • the metal is pressed on hydraulic presses in steel matrices. Sintering takes place in a push-through furnace at low temperatures (1700 ° C). The sintered rod formed is then processed into molybdenum wire by rolling, hammering and drawing. This wire can now be processed into holder wire or core wire, for example.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Powder Metallurgy (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Glass Compositions (AREA)
  • Metal Extraction Processes (AREA)
  • Luminescent Compositions (AREA)

Claims (2)

  1. Matériau à base de molybdène, notamment pour la fabrication de lampes, dans lequel le molybdène a une pureté d'au moins 99,97% en poids, caractérisé en ce que comme substance de dopage ne sont contenus que de l'aluminium et du potassium, la teneur en aluminium étant comprise entre 150 et 800 ppm en poids, le matériau à base de molybdène étant doPé en outre par une petite quantité de potassium qui représente de 5 à 50 ppm, la proportion de K étant petite par rapport à la proportion d'Al.
  2. Matériau à base de molybdène suivant la revendication 1, caractérisé en ce que la teneur en aluminium est comprise entre 400 et 600 ppm.
EP90124465A 1990-02-01 1990-12-17 Matériau en molybdène, en particulier pour la fabrication de lampes Expired - Lifetime EP0439776B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002973A DE4002973A1 (de) 1990-02-01 1990-02-01 Molybdaenmaterial, insbesondere fuer die lampenherstellung
DE4002973 1990-02-01

Publications (2)

Publication Number Publication Date
EP0439776A1 EP0439776A1 (fr) 1991-08-07
EP0439776B1 true EP0439776B1 (fr) 1994-10-26

Family

ID=6399218

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124465A Expired - Lifetime EP0439776B1 (fr) 1990-02-01 1990-12-17 Matériau en molybdène, en particulier pour la fabrication de lampes

Country Status (7)

Country Link
EP (1) EP0439776B1 (fr)
JP (1) JPH04297543A (fr)
KR (1) KR910021489A (fr)
AT (1) ATE113319T1 (fr)
DE (2) DE4002973A1 (fr)
ES (1) ES2060914T3 (fr)
HU (1) HU210093B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19603301C2 (de) * 1996-01-30 2001-02-22 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektrische Lampe mit Molybdänfoliendurchführungen für ein Lampengefäß aus Quarzglas
DE19603300C2 (de) * 1996-01-30 2001-02-22 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektrische Lampe mit Molybdänfoliendurchführungen für ein Lampengefäß aus Quarzglas

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676083A (en) * 1969-01-21 1972-07-11 Sylvania Electric Prod Molybdenum base alloys

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD49592A (fr) *
DE1211402B (de) * 1960-04-29 1966-02-24 Egyesuelt Izzolampa Verfahren zum Herstellen von Wolframdraehten, insbesondere fuer Roehrengitter
CH503114A (de) * 1966-12-21 1971-02-15 Egyesuelt Izzolampa Auf pulvermetallurgischem Wege hergestellter Metallkörper erhöhter Plastizität
AT329889B (de) * 1974-01-18 1976-06-10 Plansee Metallwerk Verfahren zur herstellung von molybdandrahten und -blechen mit stapeldrahtgefuge
JPS604548B2 (ja) * 1976-10-21 1985-02-05 ゼネラル エレクトリツク コンパニ− 電球用マウント

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676083A (en) * 1969-01-21 1972-07-11 Sylvania Electric Prod Molybdenum base alloys

Also Published As

Publication number Publication date
HUT62339A (en) 1993-04-28
JPH04297543A (ja) 1992-10-21
HU908036D0 (en) 1991-06-28
DE4002973A1 (de) 1991-08-08
ES2060914T3 (es) 1994-12-01
DE59007563D1 (de) 1994-12-01
HU210093B (en) 1995-02-28
ATE113319T1 (de) 1994-11-15
KR910021489A (ko) 1991-12-20
EP0439776A1 (fr) 1991-08-07

Similar Documents

Publication Publication Date Title
EP0369114B1 (fr) Procédé pour la fabrication de barres en alliage de tungstène
DE1935329B2 (de) Verfahren zur Herstellung von Werkstücken aus dispersionsverstärkten Metallen oder Legierungen
EP0035601A1 (fr) Procédé de fabrication d'un alliage-mémoire
DE2749215C2 (de) Verfahren zur Herstellung eines kupferhaltigen Eisenpulvers
AT392432B (de) Verfahren zur herstellung von warmkriechfesten halbfabrikaten oder formteilen aus hochschmelzenden metallen
EP0439776B1 (fr) Matériau en molybdène, en particulier pour la fabrication de lampes
EP1913626B1 (fr) Procede de production et utilisation d'un fil et support, notamment a base de niobium, pour des lampes a culot unilateral
DE3781724T2 (de) Verfahren zur herstellung einer nickel-titan-legierung.
DE19607355C2 (de) Verfahren zur Herstellung von Wolframdraht, Wolframdraht und Glühlampe mit einem solchen Wolframdraht
DE19607356C2 (de) Verfahren zur Erzeugung eines vibrations- und durchhangarmen Wolframdrahtes, Wolframdraht und Glühlampe mit einem solchen Wolframdraht
EP0016961B1 (fr) Procédé de fabrication d'un matériau composite à base de fibres supraconductrices par métallurgie des poudres
EP0439775B1 (fr) Matériau en molybdène, en particulier pour la fabrication de lampes
CH503114A (de) Auf pulvermetallurgischem Wege hergestellter Metallkörper erhöhter Plastizität
DE733318C (de) Verfahren zur Herstellung von Hartmetallegierungen
DE1950260A1 (de) Gesinterte Molybdaen-Bor-Legierung
AT73558B (de) Verfahren zum Ziehbarmachen von spröden Metallen, wie Wolfram, Molybdän, Uran oder dgl. bzw. deren Legierungen, insbesondere zur Herstellung von Metallfäden für elektrische Glühlampen.
DE2115999B2 (de) Verwendung eines wolframpulvers fuer sinterhartmetall hoher biegefestigkeit und haerte
AT293037B (de) Werkstoff auf Wolframgrundlage, Verfahren zu seiner Herstellung und Verfahren zur Herstellung von Wolframdraht daraus
DE2245120C3 (de) Verwendung einer bei hohen Temperaturen formbeständigen Glühwendel aus Wolfram mit Titan und/oder Zirkonium für halogengefüllte Lampen
DE3033877A1 (de) Legierter zuleitungsdraht und verfahren zu seiner herstellung
DE2825424C2 (de) Siliciumhaltiges Tantalpulver, Verfahren zu seiner Herstellung und seine Verwendung
AT144643B (de) Wolframmetallpulver, insbesondere zur Herstellung von dickfädigen Wolframglühkörpern.
DE102007013990A1 (de) Material für Elektroden oder Leuchtkörper und Elektrode bzw. Leuchtkörper
DE452865C (de) Gezogener Draht aus Wolfram oder anderen schwer schmelzbaren Metallen
DE578331C (de) Verfahren zur Herstellung sauerstofffreien Wolframs

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19901217

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE ES FR GB IT SE

17Q First examination report despatched

Effective date: 19930415

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE ES FR GB IT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19941026

REF Corresponds to:

Ref document number: 113319

Country of ref document: AT

Date of ref document: 19941115

Kind code of ref document: T

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19941114

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19941123

Year of fee payment: 5

REF Corresponds to:

Ref document number: 59007563

Country of ref document: DE

Date of ref document: 19941201

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2060914

Country of ref document: ES

Kind code of ref document: T3

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19941207

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19941218

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19950106

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19950831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19950901

EUG Se: european patent has lapsed

Ref document number: 90124465.7

26N No opposition filed
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19951217

Ref country code: AT

Effective date: 19951217

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF THE APPLICANT RENOUNCES

Effective date: 19951218

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19951217

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20010402