EP1114438B1 - Lampe a decharge a haute pression - Google Patents

Lampe a decharge a haute pression Download PDF

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Publication number
EP1114438B1
EP1114438B1 EP00943843A EP00943843A EP1114438B1 EP 1114438 B1 EP1114438 B1 EP 1114438B1 EP 00943843 A EP00943843 A EP 00943843A EP 00943843 A EP00943843 A EP 00943843A EP 1114438 B1 EP1114438 B1 EP 1114438B1
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EP
European Patent Office
Prior art keywords
component part
discharge lamp
niobium
pressure discharge
tantalum
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
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EP00943843A
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German (de)
English (en)
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EP1114438A1 (fr
Inventor
Reinhard Baake
David Francis Lupton
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WC Heraus GmbH and Co KG
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WC Heraus GmbH and Co KG
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Publication of EP1114438A1 publication Critical patent/EP1114438A1/fr
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Publication of EP1114438B1 publication Critical patent/EP1114438B1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors

Definitions

  • the invention relates to a high-pressure discharge lamp with a ceramic discharge vessel, through whose wall at least one current feedthrough is guided, wherein the current feedthrough and the discharge vessel are gas-tightly connected by means of a sealing compound, wherein the current feedthrough is formed from a first item of niobium, tantalum or one on niobium and / or tantalum-based alloy and at least a second component formed of a material that is more resistant to oxidation than niobium, tantalum or a niobium and / or tantalum based alloy, wherein the range of the connection between the first and the second component either is covered with the sealing compound or is formed by the melted mass, and wherein a discharge electrode is arranged at a arranged in the discharge vessel end of the current feedthrough.
  • a lamp in which a current feedthrough of a glass-tantalum mixture is used together with a quartz glass vessel, wherein the concentration of the tantalum changes along the current feedthrough.
  • the fusion between current feedthrough and quartz glass vessel takes place only in a region in which the content of tantalum in SiO 2 is less than 2% by volume.
  • the end of the current leadthrough, which contains a high proportion of tantalum, projects out of the quartz glass vessel and is only partially coated with an oxidation-protective layer of glass, metal oxide or noble metal.
  • niobium components are used as current feedthroughs for a discharge lamp.
  • the use of such a discharge lamp in a temperature range of 200-300 ° C or in a high-moisture atmosphere is recommended especially in connection with an outer capsule, which protects the current feedthroughs from oxidation and corrosion.
  • An example shows the discharge lamp and the current feedthroughs inside a gas-tight glass capsule filled with inert gas.
  • a high-pressure discharge lamp with a ceramic discharge vessel and with metal halide filling, which is arranged in a protection vessel of quartz glass is known.
  • the ends of the ceramic discharge vessel are closed with ceramic plugs, in each of which a current feedthrough with a round diameter is sintered gas-tight.
  • the current feedthroughs are designed so that the end of the current feedthrough, which projects into the discharge vessel and is in contact with the metal halide filling, is formed from corrosion-resistant tungsten, molybdenum, rhenium or alloys of these metals.
  • the other end of the current feedthroughs, which protrudes from the discharge vessel and is surrounded by the protective vessel of quartz glass, is formed for example of niobium, which is arranged protected against corrosion by the metal halide filling.
  • the present invention is based on the problem of providing a further possibility to increase the resistance of current feedthroughs, which are arranged in or on high-pressure discharge lamps, in particular to sodium high-pressure discharge lamps, against oxidation and corrosion.
  • the problem is solved once that the first item at least partially protrudes into the discharge vessel and the second item at least partially protrudes from the discharge vessel, that the second item dipped in a maximum of 50% of the thickness of the sealing compound and that the oxidation-resistant material is a metal or a Metal alloy with elements from Groups IVB and / or VIII of the Periodic Table (according to CAS).
  • a major advantage of high pressure discharge lamps with such formed current feedthroughs is that they can be operated without an additional external protective enclosure, such as glass.
  • the outer dimensions of the lamp can be made significantly smaller. This is particularly important if there is a small amount of space available for the lamp at the place of use.
  • the elements Ti and / or Pt and / or Pd and / or Ni and / or Fe and / or Ir are contained in the oxidation-resistant metal and / or the oxidation-resistant metal alloy.
  • the first item of niobium and the second item is made of titanium.
  • Titanium and the niobium alloy NbZr1 were chosen as comparison materials: Table 1: Weight increase of titanium and NbZr1 in (%) as a function of the aging time in air at elevated temperatures (- means: no measurement carried out) Temperature time 400 ° C 500 ° C 600 ° C 650 ° C 700 ° C Ti NbZr1 Ti NbZr1 Ti NbZr1 Ti NbZr1 1h 0 0,039 0,035 3,206 0,051 - 0.058 0,122 - 6h 0 3,295 - - 0,136 - 0.188 - 0,417 - 13h 0 - - - 0.17 - 0.365 - 0,762 - 29h 0 - - - 0,356 -
  • the problem is further solved in that the first item at least partially protrudes into the discharge vessel and the second item at least partially protrudes from the discharge vessel, that the second item dives in a maximum of 50% of the thickness of the sealed mass and that the oxidation resistant material is made of a ceramic , Ceramics made of Al 2 O 3 and / or MoSi 2 and / or (Mo, W) Si 2 and / or SiC and / or Si 3 N 4 are particularly preferred here.
  • a lamp with such configured current feedthroughs without an additional outer protective enclosure, for example made of glass can be operated and thus the external dimensions are low.
  • the current feedthrough can be formed at least partially in the form of a cylinder and / or a tube.
  • a current feedthrough for discharge lamps comprising as a first item a cylinder and / or a tube of niobium, tantalum or niobium and / or tantalum based alloys, one end of said first component having a second component of oxidation resistant metal and / or a more oxidation resistant one Metal alloy is gas-tight and electrically conductive and wherein the second item has the form of a protective cap forms a preferred embodiment.
  • the discharge lamp if the current feedthrough is the first item to comprise a cylinder and / or a tube made of niobium, tantalum or niobium and / or or tantalum-based alloys and when one end of said first item is gas-tightly connected to a second item of oxidation-resistant metal and / or a more oxidation-resistant metal alloy and if said second item is gas-tightly connected to a third item formed of an electrically conductive material is, and when the second and the third item together as a protective cap.
  • the first item may be electrically connected to the second and the third item or only with the third item.
  • a further embodiment of the discharge lamp is formed in that the current feedthrough as a first item a cylinder and / or a tube of niobium, tantalum or based on niobium and / or tantalum-based alloys and that one end of this first item with a second item of ceramic is gas-tightly connected and that the second item is gas-tightly connected to a third item, which is formed of an electrically conductive material, and that the second and the third item are formed together as a protective cap.
  • the first item may be electrically connected only connected to the third item.
  • the third item may be formed as a disk or cap or plug or formed from a shapeless, hardenable mass.
  • the electrically conductive material of the third item may be wholly or partly formed of Cu and / or Ag. But it is also possible that the electrically conductive material of the third item is formed wholly or partly from the same material as the second item.
  • the individual parts can be connected, for example, by welding and / or soldering and / or squeezing and / or screwing and / or bonding and / or gluing.
  • soldering ideally gas-tight, electrically non-conductive connections between two individual parts are formed by soldering with a glass solder.
  • An example after soldering performed squeezing the two items makes the electrically conductive connection between the two.
  • the above-described, particularly advantageous embodiments of the discharge lamp according to the invention have current feedthrough with two or three individual parts and are ideally made so that the first and the second item by soldering and / or squeezing and / or welding and that the second and the third item are connected by gluing.
  • the oxidation-resistant material used has a melting point greater than 1200 ° C. and an expansion coefficient of less than or equal to 10 ⁇ 10 -6 K -1 .
  • the described high-pressure discharge lamp according to the invention is particularly suitable in connection with a sodium filling in the discharge vessel, since a sodium filling attacking the discharge vessel protruding part of niobium, tantalum or a niobium or tantalum based alloy less corrosive than a metal halide filling.
  • Fig. 1 shows one of the two ends of a tubular discharge vessel 1 of a discharge lamp and a current feedthrough 2.
  • the discharge vessel 1 is made in this case of Al 2 O 3 .
  • the end of the discharge vessel 1 and the current feedthrough 2 are gas-tight soldered to a glass solder 3.
  • the current feedthrough 2 consists of a first, cylindrical individual part 2a, for example of the niobium alloy NbZr1, and a second cylindrical individual part 2b, for example of titanium.
  • the individual parts 2a and 2b are here electrically welded together.
  • the transition region between the two individual parts 2 a and 2 b is covered by the glass solder 3.
  • the second item 2b protrudes from the discharge vessel and is in direct contact with the ambient air
  • the first item 2a protrudes from NbZr1 into the discharge vessel 1 and thus is exposed to oxidation no direct contact with the ambient air.
  • Fig. 2 shows as already Fig. 1 one of the two ends of a tubular Al 2 O 3 discharge vessel 1 of a discharge lamp and a current feedthrough 2.
  • the end of the discharge vessel 1 and the current feedthrough 2 are gas-tight soldered to a glass solder 3.
  • the current leadthrough 2 consists of a first, cylindrical component 2a, for example of the niobium alloy NbZr1, and a second tubular component 2b, for example of titanium.
  • the tubular item 2b is closed on one side.
  • the items 2a and 2b have been electrically connected here by quests.
  • the transition area between the two parts 2a and 2b is covered by the Glaslot.3 and soldered gas-tight.
  • the second item 2b protrudes from the discharge vessel and is in direct contact with the ambient air
  • the first item 2a NbZr1 protrudes into the discharge vessel 1 and the second, unilaterally closed tubular member 2b and thus exposed to oxidation no direct contact with the ambient air.
  • Fig. 3 shows one of the two tubular ends of an Al 2 O 3 discharge vessel 1 of a discharge lamp and a current feedthrough 2.
  • the end of the discharge vessel 1 and the current feedthrough 2 are gas-tight soldered by a glass solder 3.
  • the current feedthrough 2 consists of a first, tube-shaped individual part 2a, for example of the niobium alloy NbZr1, and a second tubular shaped part 2b, for example of titanium.
  • the tubular item 2b is closed on one side with a third item in the form of a plug 2c.
  • the individual parts 2a and 2b are electrically connected here by welding.
  • the transition region between the two individual parts 2 a and 2 b is covered by the glass solder 3.
  • the second item 2b protrudes with the formed as a plug 2c third item from the discharge vessel and is in direct contact with the ambient air
  • the first item 2a protrudes from NbZr1 into the discharge vessel 1 and thus oxidation protected is exposed to direct contact with the ambient air.
  • the electrically conductive connection between the second individual part 2b and the third item formed as a stopper 2c can be selected depending on the temperature load and is glued here, for example.
  • the material for the third item in the form of a plug 2c is for example made of silver.
  • Fig. 4 also shows one of the two ends of a tubular Al 2 O 3 - discharge vessel 1 of a discharge lamp and a current feedthrough 2a; 2 B.
  • the end of the discharge vessel 1 and the current feedthrough 2a; 2b are gas-tight soldered through a glass solder 3.
  • the current feedthrough 2a; 2b consists of a first tube-shaped individual part 2a, for example of the niobium alloy NbZr1, and a second tube-shaped single part 2b, for example of titanium, closed on one side.
  • the items 2a and 2b are here by soldering to the glass solder 3 gas-tight, but not electrically connected.
  • the transition region between the two individual parts 2 a and 2 b is covered by the glass solder 3.
  • the second item 2b protrudes out of the discharge vessel and is in direct contact with the ambient air
  • the first item 2a of NbZr1 projects into the discharge vessel 1 and the second tube-shaped item 2b closed on one side and is thus exposed to no direct contact with the ambient air, protected against oxidation.
  • the electrically conductive connection between the second item 2b and the first item 2a is here by a crimp, indicated by the arrows, produced only after soldering with the glass solder 3.
  • Fig. 5 shows one of the two ends of a tubular Al 2 O 3 - discharge vessel 1 of a discharge lamp and a current feedthrough 2.
  • the end of the discharge vessel 1 and the current feedthrough 2 are gas-tight soldered by a glass solder 3.
  • the current feedthrough 2 consists of a first tubular element 2a, for example of the niobium alloy NbZr1, and a second tubular element 2b, for example of Al 2 O 3 .
  • the tubular member 2b is closed on one side with a third item in the form of a plug 2c.
  • the items 2a and 2b are here by soldering to the glass solder 3 gas-tight, but not electrically connected.
  • the transition region between the two individual parts 2 a and 2 b is covered by the glass solder 3.
  • the second item 2b protrudes with the formed as a plug 2c third item from the discharge vessel and is in direct contact with the ambient air
  • the first item 2a protrudes from NbZr1 into the discharge vessel 1 and thus oxidation protected is exposed to direct contact with the ambient air.
  • the electrically conductive connection between the first item 2a and the plug 2c and the gas-tight connection between the second item 2b and the third item 2c can be selected depending on the temperature load and are here, for example, connected to a conductive adhesive.
  • the choice of material for the third item in the form of the plug 2c can be selected as required, for example, from the metals silver or titanium.

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  • Vessels And Coating Films For Discharge Lamps (AREA)

Claims (19)

  1. Lampe à décharge haute pression comportant un réservoir de décharge en céramique (1) à travers la paroi duquel au moins un passage du courant (2) est guidé, le passage du courant et le réservoir de décharge étant connectés à l'aide d'une masse fondue (3) étanche aux gaz, le passage du gaz étant constitué d'un premier élément (2a) en niobium, tantale ou un alliage à base de niobium et/ou de tantale et au moins un deuxième élément (2b) constitué d'un matériau qui est plus stable vis-à-vis de l'oxydation que le niobium, le tantale ou un alliage à base de niobium et/ou de tantale, la zone de raccord entre le premier et le deuxième élément étant soit recouverte d'une masse fondue soit formée par une masse fondue, et une électrode de décharge étant disposée au niveau d'une extrémité disposée dans le réservoir de décharge du passage du courant, caractérisée en ce que le premier élément dépasse au moins partiellement dans le réservoir de décharge et le deuxième élément dépasse au moins partiellement du réservoir de décharge, en ce que le deuxième élément est enfoncé dans au maximum 50 % de l'épaisseur de la masse fondue et en ce que le matériau stable vis-à-vis de l'oxydation est un métal ou un alliage de métal avec des éléments des groupes IVB et/ou VIII du système périodique.
  2. Lampe à décharge haute pression selon la revendication 1, caractérisée en ce que les éléments Ti et/ou Pt et/ou Pd et/ou Ni et/ou Fe et/ou Ir sont contenus dans le métal stable vis-à-vis de l'oxydation et/ou l'alliage de métal stable vis-à-vis de l'oxydation.
  3. Lampe à décharge haute pression selon la revendication 1, caractérisée en ce que le premier élément est constitué de niobium et le deuxième élément de titane.
  4. Lampe à décharge haute pression comportant un réservoir de décharge en céramique (1) à travers la paroi duquel au moins un passage du courant (2) est guidé, le passage du courant et le réservoir de décharge étant connectés à l'aide d'une masse fondue (3) étanche aux gaz, le passage du gaz étant constitué d'un premier élément (2a) en niobium, tantale ou un alliage à base de niobium et/ou de tantale et au moins un deuxième élément (2b) constitué d'un matériau qui est plus stable vis-à-vis de l'oxydation que le niobium, le tantale ou un alliage à base de niobium et/ou de tantale, la zone de raccord entre le premier et le deuxième élément étant soit recouverte d'une masse fondue soit formée par une masse fondue, et une électrode de décharge étant disposée au niveau d'une extrémité disposée dans le réservoir de décharge du passage du courant, caractérisée en ce que le premier élément dépasse au moins partiellement dans le réservoir de décharge et le deuxième élément dépasse au moins partiellement du réservoir de décharge, en ce que le deuxième élément est enfoncé dans au maximum 50 % de l'épaisseur de la masse fondue et en ce que le matériau stable vis-à-vis de l'oxydation est une céramique.
  5. Lampe à décharge haute pression selon la revendication 4, caractérisée en ce que le matériau stable vis-à-vis de l'oxydation est constitué de céramique de Al2O3 et/ou MoSi2 et/ou (Mo, W)Si2 et/ou SiC et/ou Si3N4.
  6. Lampe à décharge haute pression selon l'une quelconque des revendications 1 à 3 ou 4 à 5, caractérisée en ce que le passage du courant a au moins partiellement la forme d'un cylindre et/ou d'un tube.
  7. Lampe à décharge haute pression selon la revendication 6, caractérisée en ce que le passage du courant présente, en tant que premier élément, un cylindre et/ou un tube en niobium, tantale ou des alliages à base de niobium et/ou de tantale, afin qu'une extrémité de ce premier élément soit connectée de manière étanche aux gaz et électriquement conductrice à un métal stable vis-à-vis de l'oxydation et/ou un alliage de métal stable vis-à-vis de l'oxydation et que le deuxième élément forme un couvercle de protection.
  8. Lampe à décharge haute pression selon la revendication 6, caractérisée en ce que le passage du courant présente, en tant que premier élément, un cylindre et/ou un tube en niobium, tantale ou en alliages à base de niobium et/ou tantale, afin qu'une extrémité de ce premier élément soit connectée de manière étanche aux gaz à un second métal stable vis-à-vis de l'oxydation et/ou un alliage de métal stable vis-à-vis de l'oxydation, que le deuxième élément soit raccordé de manière étanche aux gaz à un troisième élément (2c), constitué d'un matériau électriquement conducteur, et que les deuxième et troisième éléments forment ensemble un couvercle de protection.
  9. Lampe à décharge haute pression selon la revendication 8, caractérisée en ce que le premier élément est connecté de manière électriquement conductrice avec les deuxième et troisième éléments ou seulement avec le troisième élément.
  10. Lampe à décharge haute pression selon la revendication 6, caractérisée en ce que le passage du courant présente, en tant que premier élément, un cylindre et/ou un tube en niobium, tantale ou en alliages à base de niobium et/ou de tantale, qu'une extrémité de ce premier élément est connecté de manière étanche aux gaz à un deuxième élément en céramique, que le deuxième élément est connecté de manière étanche aux gaz à un troisième élément, constitué d'un matériau électriquement conducteur, et que les deuxième et troisième éléments forment ensemble un couvercle de protection.
  11. Lampe à décharge haute pression selon la revendication 10, caractérisée en ce que le premier élément est connecté de manière électriquement conductrice au troisième élément.
  12. Lampe à décharge haute pression selon l'une quelconque des revendications 8 à 11, caractérisée en ce que le troisième élément forme un joint ou un couvercle ou un bouchon ou est constitué d'une masse sans forme pouvant être durcie.
  13. Lampe à décharge haute pression selon l'une quelconque des revendications 8 à 12, caractérisée en ce que le matériau électriquement conducteur du troisième élément est totalement ou partiellement constitué de Cu et/ou Ag.
  14. Lampe à décharge haute pression selon l'une quelconque des revendications 7 à 11, caractérisée en ce que le matériau électriquement conducteur du troisième élément est totalement ou partiellement constitué du même matériau que le deuxième élément.
  15. Lampe à décharge haute pression selon l'une quelconque des revendications 1 à 14, caractérisée en ce que les éléments sont connectés par soudage et/ou brasage tendre et/ou sertissage et/ou vissage et/ou assemblage et/ ou collage.
  16. Lampe à décharge haute pression selon la revendication 15, caractérisée en ce que les connexions étanches aux gaz, électriquement non conductrices entre les deux éléments sont formées par soudage avec une soudure au gaz et en ce que la connexion électriquement conductrice est formée par sertissage des deux éléments après le brasage tendre.
  17. Lampe à décharge haute pression selon l'une quelconque des revendications 14 à 15, caractérisée en ce que les premier et deuxième éléments d'au moins l'une des revendications 7 à 11 sont connectés par brasage tendre et/ou sertissage et/ou soudage et en ce que le deuxième et le troisième élément d'au moins l'une des revendications 8 à 11 sont connectés par collage.
  18. Lampe à décharge haute pression selon l'une quelconque des revendications 1 à 17, caractérisée en ce que le matériau stable vis-à-vis de l'oxydation présente un point de fusion supérieur à 1 200 °C et un coefficient de dilatation inférieur ou égal à 10.10-6K-1.
  19. Lampe à décharge haute pression selon l'une quelconque des revendications 1 à 18, caractérisée en ce que la lampe à décharge haute pression est agencée comme une lampe à décharge haute pression à vapeur de sodium.
EP00943843A 1999-07-20 2000-06-21 Lampe a decharge a haute pression Expired - Lifetime EP1114438B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19933154A DE19933154B4 (de) 1999-07-20 1999-07-20 Entladungslampe
DE19933154 1999-07-20
PCT/EP2000/005695 WO2001006541A1 (fr) 1999-07-20 2000-06-21 Lampe a decharge a haute pression

Publications (2)

Publication Number Publication Date
EP1114438A1 EP1114438A1 (fr) 2001-07-11
EP1114438B1 true EP1114438B1 (fr) 2008-12-17

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EP00943843A Expired - Lifetime EP1114438B1 (fr) 1999-07-20 2000-06-21 Lampe a decharge a haute pression

Country Status (5)

Country Link
US (1) US6414451B1 (fr)
EP (1) EP1114438B1 (fr)
JP (1) JP2003505834A (fr)
DE (2) DE19933154B4 (fr)
WO (1) WO2001006541A1 (fr)

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DE69824824T2 (de) 1997-04-11 2005-07-07 Ushio Denki K.K. Dichtung eines lampenkolben
US6169366B1 (en) * 1997-12-24 2001-01-02 Ngk Insulators, Ltd. High pressure discharge lamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9082606B2 (en) 2011-05-17 2015-07-14 Osram Gmbh High-pressure discharge lamp

Also Published As

Publication number Publication date
EP1114438A1 (fr) 2001-07-11
US6414451B1 (en) 2002-07-02
JP2003505834A (ja) 2003-02-12
WO2001006541A1 (fr) 2001-01-25
DE19933154B4 (de) 2006-03-23
DE50015489D1 (de) 2009-01-29
DE19933154A1 (de) 2001-02-01

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