EP1043753A1 - Elément métallique et lampe à décharge - Google Patents

Elément métallique et lampe à décharge Download PDF

Info

Publication number
EP1043753A1
EP1043753A1 EP00104951A EP00104951A EP1043753A1 EP 1043753 A1 EP1043753 A1 EP 1043753A1 EP 00104951 A EP00104951 A EP 00104951A EP 00104951 A EP00104951 A EP 00104951A EP 1043753 A1 EP1043753 A1 EP 1043753A1
Authority
EP
European Patent Office
Prior art keywords
gold
coating
palladium
niobium
carrier
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.)
Granted
Application number
EP00104951A
Other languages
German (de)
English (en)
Other versions
EP1043753B1 (fr
Inventor
Thomas Giesel
David Dr. Lupton
Frank Dr. Kruger
Friedhold Schölz
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.)
WC Heraus GmbH and Co KG
Original Assignee
WC Heraus GmbH and Co KG
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 WC Heraus GmbH and Co KG filed Critical WC Heraus GmbH and Co KG
Publication of EP1043753A1 publication Critical patent/EP1043753A1/fr
Application granted granted Critical
Publication of EP1043753B1 publication Critical patent/EP1043753B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 relates to a metallic component for discharge lamps, with a carrier made of niobium, Tantalum or from alloys based on niobium and / or tantalum and a discharge lamp.
  • Such a component is known from the document G 86 28 310.3. It shows one possibility of using niobium as a feedthrough for high pressure lamps. A gas-tight seal and a structurally very complex arrangement are used to protect the niobium from corrosion, here, among other things, by aggressive metal halides. In GB 2 178 230 A, such 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 an atmosphere with a high moisture content is recommended above all in connection with an outer capsule that protects the current feedthroughs from oxidation and corrosion. An example shows the discharge lamp and the current feedthroughs inside a protective capsule made of glass filled with inert gas.
  • the present invention is based on the problem of the durability of metallic Components with a carrier made of niobium, tantalum or of alloys based on niobium and / or tantalum, which are arranged in or on discharge lamps, against oxidation and corrosion to increase.
  • the carrier has a coating of one or more individual layers, which is formed from at least one noble metal and / or from a noble metal alloy.
  • a coating very well meets the requirements for an increase in oxidation and corrosion resistance, sufficient ductility and thermal shock resistance.
  • the noble metals gold and / or platinum and / or palladium and / or an alloy formed from at least two of these elements are ideally used for the coating composed of one or more individual layers.
  • These precious metals used for the coating have a melting point above 1000 ° C. Therefore, these coatings allow the effect of higher temperatures than the operating temperatures normally occurring in the discharge lamp in a reducing or inert atmosphere, so that possibly necessary assembly operations such as soldering can be carried out on them before use.
  • niobium alloys for discharge lamps can first be coated with the noble metal and then the coated current feedthroughs can be soldered into openings in the discharge vessel without the protective effect of the coating being lost due to the high temperature load during the soldering process.
  • a first individual layer of gold and a second individual layer of platinum and / or palladium and / or an alloy which is formed from at least two of the noble metals gold, platinum or palladium are applied to the carrier.
  • a first individual layer preferably has a thickness of 0.1 ⁇ m to 5 ⁇ m, further individual layers applied thereon each have a thickness of 1 ⁇ m to 5 ⁇ m.
  • An individual layer is understood to mean a layer made of a noble metal or a noble metal alloy which is present in one or in successive layers Manufacturing steps, also with the help of different manufacturing processes.
  • the coating material is to be selected from the noble metals or noble metal alloys mentioned, depending on its melting point. If different precious metals are combined, diffusion bonds can form under the influence of elevated temperatures.
  • the coating can thus have a noble metal mixed crystal produced by diffusion, which is either only present at the transition between two individual layers or which takes up the entire volume of the coating. If, for example, with gold as the first single layer and palladium as the second single layer diffuses the palladium into the gold layer underneath, its melting point increases.
  • This diffusion connection can be produced by means of a temperature treatment, for example directly after the production of the coated component, during a soldering process during the assembly of the component or at the place of use and under the conditions of use.
  • the individual layer can be applied physically and / or chemically to the carrier made of niobium, tantalum or of alloys based on niobium and / or tantalum.
  • a single layer is applied by sputtering and / or electroplating, since it is also possible here to selectively coat surfaces on components with complex shapes.
  • the two methods are simple, uncomplicated and can be carried out without using high temperatures.
  • the first individual layer is preferably produced by sputtering or by sputtering and a subsequent electroplating process, since the sputtered noble metal forms a good adhesive bond with the carrier and thus acts as an adhesion promoter.
  • the surface quality of the support to be coated made of niobium, tantalum or of niobium and / or tantalum-based alloys is a decisive influencing factor for the duration of the protective effect of the coating. If there are many imperfections such as pores, scratches or processing marks on the surface of the carrier, the probability is increased that the coating cannot be completely closed at these locations. Starting from these imperfections, which can continue in the coating, for example in the form of holes or thin spots, the carrier is attacked by oxidation or corrosion.
  • the discharge lamp according to the invention contains a discharge vessel, through the wall of which metallic components are passed as current feedthroughs, such as in the case of high-pressure lamps.
  • the current feedthroughs have a carrier made of niobium, tantalum or alloys based on niobium and / or tantalum, which has a coating of one or more individual layers, which is formed from at least one noble metal and / or from a noble metal alloy.
  • a great advantage of the discharge lamps with current feedthroughs coated in this way is that they can be operated without an additional external protective encapsulation, for example made of glass.
  • the noble metal preferably used for coating the current feedthroughs is gold and / or platinum and / or palladium and / or an alloy formed from at least two of these noble metals.
  • first individual layer of gold and a second individual layer of platinum and / or palladium and / or an alloy which is formed from at least two of the noble metals gold, platinum or palladium are applied to the carrier of the current feedthroughs.
  • the first individual layer may have a thickness of 0.1 ⁇ m to 5 ⁇ m, and further individual layers applied thereon each have a thickness of 1 ⁇ m to 5 ⁇ m.
  • the coating can also only partially cover the carrier of the current feedthroughs.
  • the coating can have a noble metal mixed crystal produced by diffusion.
  • Examples 1 to 9 below and FIG. 1 explain the advantages of the invention in more detail out.
  • components in the form of wire pins made of the alloy NbZr1 were included the diameter 1mm and the length 15mm.
  • FIG. 1 shows an example of one of the two connection areas of a discharge lamp.
  • the discharge lamp with a tubular discharge vessel 1 made of ceramic and a current lead-through 2 made of niobium, the surface of which partially matches that of the invention Coating 3 of precious metal is covered.
  • the current feedthrough 2 is using a Glass solder 4 soldered gas-tight into the tube opening of the discharge vessel 1 and protrudes with it the uncoated end into the discharge vessel 1.
  • the other end of the bushing 2 with the coating 3 is located outside of the discharge vessel 1 the ambient air.
  • the glass solder 4 also covers the area of the current feedthrough 2, at which the coating 3 ends, so that the current feedthrough 2 in the area outside the Discharge vessel 1 completely covered with the coating 3 and before oxidation by the Oxygen from the ambient air is protected.
  • the uncoated end of the current feedthrough 2 carries, for example, a tungsten electrode 5.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
EP00104951A 1999-04-09 2000-03-08 Elément métallique et lampe à décharge Expired - Lifetime EP1043753B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19915920 1999-04-09
DE19915920A DE19915920A1 (de) 1999-04-09 1999-04-09 Metallisches Bauteil und Entladungslampe

Publications (2)

Publication Number Publication Date
EP1043753A1 true EP1043753A1 (fr) 2000-10-11
EP1043753B1 EP1043753B1 (fr) 2005-05-11

Family

ID=7903938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00104951A Expired - Lifetime EP1043753B1 (fr) 1999-04-09 2000-03-08 Elément métallique et lampe à décharge

Country Status (4)

Country Link
US (1) US6384533B1 (fr)
EP (1) EP1043753B1 (fr)
JP (1) JP3594871B2 (fr)
DE (2) DE19915920A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007020014A2 (fr) * 2005-08-12 2007-02-22 W. C. Heraeus Gmbh Fil et support, notamment a base de niobium, pour des lampes a culot unilateral, ainsi que procede de production correspondant et utilisation
WO2009017891A1 (fr) * 2007-08-01 2009-02-05 General Electric Company Ensemble d'interface métal-oxyde destiné à supporter une température de fonctionnement élevée et à réduire l'écaillage

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060232211A1 (en) * 2003-05-01 2006-10-19 Koninklijke Philips Electronics N.V. Method of manufacturing a lamp
US7358674B2 (en) * 2004-07-27 2008-04-15 General Electric Company Structure having electrodes with metal core and coating
JP5338557B2 (ja) * 2009-08-19 2013-11-13 ウシオ電機株式会社 ベース付きランプ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015165A (en) * 1975-02-04 1977-03-29 U.S. Philips Corporation Electric lamp with molybdenum contact pins surrounded by non-corrosive metal sleeves
JPS6063871A (ja) * 1983-09-19 1985-04-12 Toshiba Corp メタルハライドランプ
EP0341750A2 (fr) * 1988-05-13 1989-11-15 Gte Products Corporation Tube à arc et lampe à décharge à haute pression comportant un tel tube
EP0410511A1 (fr) * 1989-07-24 1991-01-30 Koninklijke Philips Electronics N.V. Lampe électrique
US5424609A (en) * 1992-09-08 1995-06-13 U.S. Philips Corporation High-pressure discharge lamp
EP0751549A1 (fr) * 1995-01-13 1997-01-02 Ngk Insulators, Ltd. Lampe a decharge haute pression et procede de production correspondant
WO1998037570A1 (fr) * 1997-02-24 1998-08-27 Koninklijke Philips Electronics N.V. Lampe aux halogenures haute pression

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE626363C (de) * 1933-09-25 1936-02-25 Patra Patent Treuhand Stromeinfuehrungsdraht fuer aus Hartglas bestehende Gefaesse, insbesondere fuer elektrische Leuchtroehren mit Metalldampffuellung
DE963173C (de) * 1949-09-22 1957-05-02 Egyesuelt Izzolampa Verfahren zur Herstellung einer Einschmelzung fuer aus versilberten Drahtstiften bestehende Stromzufuehrungen fuer elektrische Entladungsroehren, insbesondere fuer Radioroehren
BE541097A (fr) * 1954-09-08
NL7511416A (nl) * 1975-09-29 1977-03-31 Philips Nv Elektrische ontladingslamp.
HU202013B (en) * 1985-07-02 1991-01-28 Tungsram Reszvenytarsasag Impulsed inert gas discharge lamp
DE8628310U1 (de) * 1986-10-23 1989-06-22 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 81543 München Einschmelzung für eine Hochdruckentladungslampe
US5336968A (en) * 1992-06-30 1994-08-09 General Electric Company DC operated sodium vapor lamp
WO1998047169A1 (fr) 1997-04-11 1998-10-22 Ushio Denki Kabushiki Kaisya Joint d'ampoule

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015165A (en) * 1975-02-04 1977-03-29 U.S. Philips Corporation Electric lamp with molybdenum contact pins surrounded by non-corrosive metal sleeves
JPS6063871A (ja) * 1983-09-19 1985-04-12 Toshiba Corp メタルハライドランプ
EP0341750A2 (fr) * 1988-05-13 1989-11-15 Gte Products Corporation Tube à arc et lampe à décharge à haute pression comportant un tel tube
EP0410511A1 (fr) * 1989-07-24 1991-01-30 Koninklijke Philips Electronics N.V. Lampe électrique
US5424609A (en) * 1992-09-08 1995-06-13 U.S. Philips Corporation High-pressure discharge lamp
EP0751549A1 (fr) * 1995-01-13 1997-01-02 Ngk Insulators, Ltd. Lampe a decharge haute pression et procede de production correspondant
WO1998037570A1 (fr) * 1997-02-24 1998-08-27 Koninklijke Philips Electronics N.V. Lampe aux halogenures haute pression

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 197 (E - 335) 14 August 1985 (1985-08-14) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007020014A2 (fr) * 2005-08-12 2007-02-22 W. C. Heraeus Gmbh Fil et support, notamment a base de niobium, pour des lampes a culot unilateral, ainsi que procede de production correspondant et utilisation
WO2007020014A3 (fr) * 2005-08-12 2007-06-21 Heraeus Gmbh W C Fil et support, notamment a base de niobium, pour des lampes a culot unilateral, ainsi que procede de production correspondant et utilisation
US7994692B2 (en) 2005-08-12 2011-08-09 W. C. Heraeus Gmbh Wire and frame, in particular niobium-based, for single-side socket lamps and a method for the production and use thereof
WO2009017891A1 (fr) * 2007-08-01 2009-02-05 General Electric Company Ensemble d'interface métal-oxyde destiné à supporter une température de fonctionnement élevée et à réduire l'écaillage

Also Published As

Publication number Publication date
DE50010258D1 (de) 2005-06-16
EP1043753B1 (fr) 2005-05-11
DE19915920A1 (de) 2000-10-19
JP2000311651A (ja) 2000-11-07
JP3594871B2 (ja) 2004-12-02
US6384533B1 (en) 2002-05-07

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