EP1032022B1 - Lampe à halogénure métallique avec enveloppe céramique - Google Patents

Lampe à halogénure métallique avec enveloppe céramique Download PDF

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Publication number
EP1032022B1
EP1032022B1 EP00100687A EP00100687A EP1032022B1 EP 1032022 B1 EP1032022 B1 EP 1032022B1 EP 00100687 A EP00100687 A EP 00100687A EP 00100687 A EP00100687 A EP 00100687A EP 1032022 B1 EP1032022 B1 EP 1032022B1
Authority
EP
European Patent Office
Prior art keywords
cermet
ceramic
halide lamp
rare
metal halide
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
EP00100687A
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German (de)
English (en)
Other versions
EP1032022A1 (fr
Inventor
Reiner-Joachim Dr. Dinter
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 EP1032022A1 publication Critical patent/EP1032022A1/fr
Application granted granted Critical
Publication of EP1032022B1 publication Critical patent/EP1032022B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 is based on a metal halide lamp with a ceramic discharge vessel according to the preamble of claim 1. It is in particular around metal halide lamps with an output of at least 100 W.
  • a generic metal halide lamp with a ceramic discharge vessel and a halide-resistant bushing is already known from EP-A 587 238.
  • the front part of the bushing facing the discharge can consist of an electrically conductive cermet (with a ceramic and a conductive phase).
  • Aluminum oxide or also MgO, Sc 2 O 3 or Y 2 O 3 is used as the ceramic phase.
  • a halogen-resistant metal, for example tungsten, or molybdenum disilicide (MoSi 2 ) is proposed as the conductive phase of the cermet.
  • Filling components made from rare earth metal halides (SE) are usually used in these lamps.
  • DyJ 3 is recommended.
  • the use of the iodides of Sc, Y, Ho or Tm is recommended.
  • EP-A 887 839 recommends using a continuous cermet stick to be used for metal halide lamps with ceramic discharge tube.
  • the starting point of the present invention is the discovery that due to the high temperature in the area of the end face of the binding carrying out Rare earth metal ions from the filling preferably in the region of a front zone Implementation takes place, at least the surface of the part of the implementation that with is in contact with the discharge volume. Most of them are the frontal discharge end of the bushing since it is the highest temperature reached in operation. In contrast, the discharge vessel itself and the sealant (usually a stopper) significantly less affected.
  • the front part is a cermet component with a ceramic and an electrically conductive Phase.
  • the ceramic phase of the cermet component contains the ceramic phase of the cermet component, either the entire one Component or a zone on the surface facing the discharge from from the outset a considerable proportion (especially at least 40, especially more than 80 mol%) of a corresponding compound made of the ceramic base material and at least one rare earth oxide, the cermet component or its zone exposed to discharge, no longer bind rare earth metal from the filling. Therefore, the filling and thus the maintenance of the lamp over a long service life stable without using an overdose of the filling got to.
  • the surface with a garnet or perovskite structure can be on the front and possibly also on the lateral surface of the cermet component.
  • the invention is a metal halide lamp ceramic discharge vessel, the discharge vessel having two ends which are closed with means for sealing.
  • one electrically conductive bushing passed vacuum-tight, on the one electrode is fastened with a shaft which projects into the interior of the discharge vessel.
  • At least one front part of the feedthrough that faces the discharge is designed as a halide-resistant component made of electrically conductive cermet, that of an electrically conductive (especially metallic) and a ceramic Phase, which comprises a ceramic base material.
  • the filling comprises at least a rare earth metal (i.e. Sc, Y, La and the 14 lanthanoids), mostly as a halide, or as a complex or elementary.
  • At least on the face (Front) of the component consists of at least part of the ceramic phase Connection of the ceramic base material with one or more rare earth oxides.
  • the cermet component is preferably a pin or a tube.
  • the cermet usually has a metal such as molybdenum or tungsten or rhenium or their alloys or a metal silicide such as MoSi 2 as the electrically conductive phase.
  • the safest is when it covers the entire area Length of the component at least part of the ceramic phase from the connection of the ceramic base material with one or more rare earth oxides consists.
  • the entire ceramic phase preferably consists of the connection of the ceramic base material and one or more rare earth oxides.
  • the Cermet component can carry out the front part or the whole Form implementation.
  • the ceramic base material is usually polycrystalline aluminum oxide.
  • those used for the cermet component include Rare earth metal oxides are the oxides of one or more or all of them in the filling contained rare earth metals.
  • the rare earth oxides comprise the oxides of one or more rare earth metals not contained in the filling, in particular Y 2 O 3 .
  • Embodiment corresponds to the connection of the ceramic base material with one or more rare earth oxides Garnet or perovskite or a mixture of both.
  • a perovskite preferably oxides of La, Nd, Sm, Eu or Gd are used.
  • oxides of Lu, Yb, Tm and Y are particularly suitable for both structures and their mixtures.
  • This special cermet component is used in all metal halide lamps possible with ceramic discharge vessel, regardless of whether the seal by means of melting ceramics or by direct sintering.
  • the production of the special cermet can be carried out in a manner known per se by processing an appropriate powder mixture.
  • the basic Suitability of such materials (especially yttrium aluminum garnet) for the lamp construction is already known, see US-A 5 698 948. There the material however used for discharge vessels. The requirement of Translucency does not matter in the implementation.
  • the means for sealing (usually a stopper) advantageously consists of ceramic or Cermet (for example, suitably doped aluminum oxide), the ceramic Base material of the cermet component is a ceramic main component of the agent corresponds to sealing, here aluminum oxide.
  • This arrangement has the advantage that the thermal expansion coefficients of both parts are similar, so that a direct sintering of the cermet component in the stopper is particularly successful.
  • a metal halide lamp with an output of 250 W is shown schematically in FIG. It consists of a cylindrical outer bulb 1 made of quartz glass which defines a lamp axis and is squeezed (2) and base (3) on two sides.
  • the axially arranged discharge vessel 4 made of Al 2 O 3 ceramic is bulged in the middle 5 and has two cylindrical ends 6a and 6b. It is held in the outer bulb 1 by means of two power leads 7, which are connected to the base parts 3 via foils 8.
  • the power supply lines 7 are welded to bushings 9, 10 which are each fitted in an end plug 11 at the end of the discharge vessel.
  • the bushings 9, 10 are cermet pins with a diameter of approx. 1 mm, which consist of an electrically conductive cermet.
  • Both bushings 9, 10 extend over the entire length of the plug 11 and hold electrodes 14 on the discharge side, consisting of an electrode shaft 15 made of tungsten and one pushed on at the discharge end Spiral 16.
  • the bushing 9, 10 is in each case with the electrode shaft 15 and butt welded to the external power supply 7.
  • the discharge vessel is filled with an inert ignition gas, e.g. Argon, and possibly mercury from additions to metal halides, thereof at least one rare earth metal.
  • an inert ignition gas e.g. Argon
  • mercury from additions to metal halides, thereof at least one rare earth metal.
  • End plugs 11 are used as means for sealing, which essentially consist of Al 2 O 3 , for example. It is also possible to use a non-conductive cermet with the main component Al 2 O 3 , with tungsten being present as a metallic component in a proportion of approximately 30% by weight (or molybdenum with a correspondingly higher proportion).
  • the bushing 9, 10 is sintered directly into the plug 11. More like that The plug 11 is also in each case in the cylindrical end 6 of the discharge vessel sintered directly (i.e. without glass solder or melting ceramic).
  • an axially parallel bore 12 in the plug 11 provided for evacuating and filling the discharge vessel in a known manner Way serves.
  • This bore 12 is made after filling by means of a pin 13 or closed by means of melting ceramic.
  • the pen usually consists of Ceramics or cermet.
  • a cermet pen is suitable as bushing 9, 10, which in addition to ceramic phase with the base material aluminum oxide at least 44 vol .-% Contains metal (preferably between 45 and 75 vol .-%) and is electrically conductive. In particular 70 to 90% by weight of tungsten or 55 to 80% by weight of molybdenum is suitable (or an amount of rhenium equivalent in volume).
  • the ceramic Phase consists entirely of garnet (see below).
  • a cermet with a lower percentage is suitable as the material for the end plug of metal as the feedthrough (preferably about half the proportion in the Implementation) contains.
  • An essential property of the plug is that coefficient of thermal expansion between that of implementation and that of Discharge vessel is.
  • the metal content of the stopper can also be zero.
  • the electrode is welded to the end face of the bushing before the bushing is sintered into the stopper.
  • the weldable cermet pin is largely pre-sintered before it is finally sintered.
  • the proportion of rare earth metal ions was accordingly in the filling at the beginning: Dy 3+ 5.8% and Ho 3+ 5.9% and Tm 3+ 6.0%.
  • the rare earth ion with the smallest effective ion radius namely Tm (about 0.088 nm ion radius, see Fig. 2), accumulated significantly more than the other two: Dy 3+ 15.2% by weight; Ho 3+ 18.4 wt% and Tm 3+ 26.8 wt%.
  • cermet component was used, that from the outset as the ceramic phase, for example the natural one Equilibrium distribution used and thus anticipates this diffusion process:
  • a regular garnet was used as the ceramic phase for this cermet component, using only Tm 2 O 3 as the rare earth oxide with aluminum oxide as the base material.
  • Sc 2 O 3 (or also Yb 2 O 3 ) is used as the rare earth metal oxide. Both ions have a smaller ion radius (0.075 or 0.087 nm) than the rare earth metal ions used in the filling. The life span achieved in this way corresponds approximately to that of the second exemplary embodiment.
  • a second embodiment is at the ends of the approximately circular cylindrical Discharge vessel 25 each sintered a non-conductive plug 26 directly.
  • the implementation is an electrically conductive cermet pin 9, 10 with a Metal content of 50% by volume.
  • the rest is a ceramic phase.
  • the plug 26 out Aluminum oxide consists of two concentric parts, an outer annular one Plug part 21 and an inner, about twice as long capillary tube 20. Nevertheless the capillary tube is about 50% compared to known capillary tube techniques , shorter.
  • the large length of the capillary tube compared to the plug part 21 improved the sealing behavior.
  • the cermet pin 9 is recessed in the capillary tube 20 and sintered there directly.
  • the filling bore 22 is in the outer plug part 21 accommodated.
  • an Eu 2 O 3 perovskite structure is used as the ceramic phase only on its end face 19 over an axial length of approximately 1 mm, which gradually changes into the known structure with a pure aluminum oxide phase in a subsequent transition zone, which is used at the end of the pen.
  • Figure 4 shows a cermet pin 27, which is composed of two parts.
  • the front front part 28 has a garnet structure as a ceramic phase with aluminum oxide as the base material and Er 2 O 3 as the rare earth oxide. It has an axial nose 29 with which it is fitted into a circular cylindrical bore of an extension part 30 arranged behind it. Both parts are connected by direct sintering.
  • both parts of the cermet pin 31, the cermets of which can be welded by the proportion of the metallic phase (Mo) being approximately 50% by volume, can be butt-welded to one another, as shown in FIG. 5.
  • the front part 32 and the extension part 33 are approximately the same length.
  • YAG yttrium aluminum garnet, 3 Y 2 O 3 • 5 Al 2 O 3
  • FIG. 6 shows a further exemplary embodiment in which the end of the cylindrical ceramic discharge vessel 40 (made of aluminum oxide) is closed by a ceramic end plate 41 and a tubular plug 42.
  • a two-part bushing 43 is sealed by means of glass solder 44 in the stopper.
  • the bushing 43 consists of a cermet pin 45 on the discharge side and a niobium pin 46 facing away from the discharge.
  • the electrode 47 is fastened to the cermet pin.
  • the surface of the cermet stick is covered by a 300 ⁇ m thick layer 48 of YAG.
  • the conductive phase (60 vol.%) Of the cermet stick consists of MoSi 2
  • the ceramic phase (rest) consists of 50 mol.% Al 2 O 3 and 50 mol.% Of a mixture of YAG and Eu 2 O 3 - perovskite.
  • the filling contains DyJ 3 and CeJ 3 as rare earth metal iodides.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Discharge Lamp (AREA)

Claims (13)

  1. Lampe à halogénure métallique ayant une enceinte (4) de décharge en céramique, l'enceinte de décharge ayant deux extrémités (6a, 6b) qui sont fermées respectivement par des moyens d'étanchéité et dans laquelle il passe d'une manière étanche au vide, à travers ces moyens, respectivement une traversée (9, 10, 30) conductrice de l'électricité à laquelle est fixée une électrode (14) qui pénètre à l'intérieur de l'enceinte de décharge, au moins une partie (45) avant de la traversée, qui est tournée vers la décharge, étant constituée sous la forme d'un élément résistant aux halogénures en un cermet conducteur de l'électricité, qui comprend une première phase conductrice de l'électricité et une deuxième phase céramique qui renferme une matière de base en céramique, et dans laquelle l'atmosphère comprend au moins un métal de terre rare avec inclusion des métaux ytrium et scandium, caractérisée en ce qu'au moins sur une surface (28, 32) accessible à l'atmosphère, de l'élément en cermet, au moins une partie de la phase céramique est en le composé de la matière de base en céramique avec un ou plusieurs oxydes du métal de terre rare.
  2. Lampe à halogénure métallique suivant la revendication 1, caractérisée en ce que l'élément en cermet a la forme d'une tige (9, 10) en cermet.
  3. Lampe à halogénure métallique suivant la revendication 1, caractérisé en ce que le cermet, a en tant que phase conductrice de l'électricité, du molydène, ou du tungstène ou du rhénium ou leurs alliages ou du MoSi2.
  4. Lampe à halogénure métallique suivant la revendication 1, caractérisée en ce que, pour l'ensemble de l'élément, une partie de la phase céramique est en le composé de la matière de base en céramique et d'un ou plusieurs oxydes du métal de terre rare.
  5. Lampe à halogénure métallique suivant la revendication 1, caractérisée en ce que toute la phase céramique est constituée du composé de la matière de base en céramique et d'un ou plusieurs oxydes du métal de terre rare.
  6. Lampe à halogénure métallique suivant la revendication 1, caractérisée en ce que la matière de base en céramique est en oxyde d'aluminium.
  7. Lampe à halogénure métallique suivant la revendication 1, caractérisée en ce que les oxydes du métal de terre rare comprennent les oxydes de plusieurs on de tout les métaux de terre rare contenus dans l'atmosphère.
  8. Lampe à halogénures métalliques suivant la revendication 1, caractérisée en ce que les oxydes du métal de terre rare comprennent les oxydes d' un ou plusieurs métaux de terre rare, qui ne sont pas contenus dans l'atmosphère, notamment Y2O3.
  9. Lampe à halogénure métallique suivant la revendication 1, caractérisée en ce que le composé de la matière de base en céramique et d'un ou de plusieurs oxydes du métal de terre rare correspond à un grenat ou une perowskite ou à un mélange des deux.
  10. Lampe à halogénure métallique suivant la revendication 1, caractérisée en ce qu'il est utilisé, comme oxyde de métal de terre rare, principalement ou exclusivement les oxydes de métaux de terre rare ayant un rayon ionique aussi petit que possible, ayant notamment un rayon ionique qui est égal ou inférieur au rayon ionique des métaux de terre rare contenus dans l'atmosphère.
  11. Lampe à halogénure métallique suivant la revendication 1, caractérisée en ce que l'atmosphère contient le métal de terre rare sous forme d'halogénures.
  12. Lampe à halogénure métallique, suivant la revendication 1, caractérisée en ce que le moyen (20) d'étanchéité est en céramique ou en cermet, la matière de base en céramique de l'élément (9) en cermet correspondant à un constituant principal céramique du moyen d'étanchéité.
  13. lampe à halogénure métallique, suivant la revendication 1, caractérisée en ce que la surface se trouve du côté avant et, le cas échéant, sur la surface latérale de l'élément en cermet.
EP00100687A 1999-02-26 2000-01-14 Lampe à halogénure métallique avec enveloppe céramique Expired - Lifetime EP1032022B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19908688A DE19908688A1 (de) 1999-02-26 1999-02-26 Metallhalogenidlampe mit keramischem Entladungsgefäß
DE19908688 1999-02-26

Publications (2)

Publication Number Publication Date
EP1032022A1 EP1032022A1 (fr) 2000-08-30
EP1032022B1 true EP1032022B1 (fr) 2004-09-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00100687A Expired - Lifetime EP1032022B1 (fr) 1999-02-26 2000-01-14 Lampe à halogénure métallique avec enveloppe céramique

Country Status (7)

Country Link
US (1) US6404130B1 (fr)
EP (1) EP1032022B1 (fr)
JP (1) JP4567134B2 (fr)
AT (1) ATE276584T1 (fr)
CA (1) CA2298270A1 (fr)
DE (2) DE19908688A1 (fr)
HU (1) HUP0000904A3 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6805603B2 (en) * 2001-08-09 2004-10-19 Matsushita Electric Industrial Co., Ltd. Electrode, manufacturing method thereof, and metal vapor discharge lamp
US7525252B2 (en) * 2002-12-27 2009-04-28 General Electric Company Sealing tube material for high pressure short-arc discharge lamps
CN1745449A (zh) * 2003-01-27 2006-03-08 皇家飞利浦电子股份有限公司 用气体填充灯的方法及充有气体的灯
US6774547B1 (en) 2003-06-26 2004-08-10 Osram Sylvania Inc. Discharge lamp having a fluted electrical feed-through
DE102004015467B4 (de) * 2004-03-26 2007-12-27 W.C. Heraeus Gmbh Elektrodensystem mit einer Stromdurchführung durch ein Keramikbauteil
WO2005109471A2 (fr) * 2004-05-10 2005-11-17 Koninklijke Philips Electronics N.V. Lampe a decharge haute pression
US7329979B2 (en) * 2004-07-15 2008-02-12 General Electric Company Electrically conductive cermet and devices made thereof
US7615929B2 (en) * 2005-06-30 2009-11-10 General Electric Company Ceramic lamps and methods of making same
WO2008089662A1 (fr) * 2007-01-19 2008-07-31 Cnlight Co., Ltd. Système d'électrodes destiné à une lampe aux halogènure métalliques dotée d'un brûleur en céramique
DE102007046899B3 (de) * 2007-09-28 2009-02-12 W.C. Heraeus Gmbh Stromdurchführung durch Keramikbrenner in Halogen-Metalldampflampen
DE102007055399A1 (de) 2007-11-20 2009-05-28 Osram Gesellschaft mit beschränkter Haftung Hochdruckentladungslampe
US8134290B2 (en) * 2009-04-30 2012-03-13 Scientific Instrument Services, Inc. Emission filaments made from a rhenium alloy and method of manufacturing thereof

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
NZ182774A (en) * 1975-12-09 1979-06-19 Thorn Electrical Ind Ltd Electrically conducting cermet
GB1571084A (en) * 1975-12-09 1980-07-09 Thorn Electrical Ind Ltd Electric lamps and components and materials therefor
US4155757A (en) * 1976-03-09 1979-05-22 Thorn Electrical Industries Limited Electric lamps and components and materials therefor
NL183092C (nl) * 1976-08-05 1988-07-18 Philips Nv Gasontladingslamp.
DE3063533D1 (en) * 1979-11-12 1983-07-07 Emi Plc Thorn An electrically conducting cermet, its production and use
DE3174149D1 (en) * 1980-12-20 1986-04-24 Emi Plc Thorn Discharge lamp arc tubes
NL8101177A (nl) * 1981-03-11 1982-10-01 Philips Nv Samengesteld lichaam.
EP0587238B1 (fr) * 1992-09-08 2000-07-19 Koninklijke Philips Electronics N.V. Lampe à décharge à haute pression
ES2150433T3 (es) * 1992-09-08 2000-12-01 Koninkl Philips Electronics Nv Lampara de descarga de alta presion.

Also Published As

Publication number Publication date
US6404130B1 (en) 2002-06-11
EP1032022A1 (fr) 2000-08-30
JP2000251842A (ja) 2000-09-14
DE19908688A1 (de) 2000-08-31
JP4567134B2 (ja) 2010-10-20
ATE276584T1 (de) 2004-10-15
CA2298270A1 (fr) 2000-08-26
HUP0000904A2 (hu) 2000-09-28
HU0000904D0 (en) 2000-04-28
HUP0000904A3 (en) 2002-11-28
DE50007716D1 (de) 2004-10-21

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