EP2143131A2 - Procédé de fabrication d'une feuille de molybdène pour la construction de lampes, feuille de molybdène, et lampe comportant la feuille de molybdène - Google Patents

Procédé de fabrication d'une feuille de molybdène pour la construction de lampes, feuille de molybdène, et lampe comportant la feuille de molybdène

Info

Publication number
EP2143131A2
EP2143131A2 EP08736529A EP08736529A EP2143131A2 EP 2143131 A2 EP2143131 A2 EP 2143131A2 EP 08736529 A EP08736529 A EP 08736529A EP 08736529 A EP08736529 A EP 08736529A EP 2143131 A2 EP2143131 A2 EP 2143131A2
Authority
EP
European Patent Office
Prior art keywords
molybdenum foil
particles
molybdenum
lamp
oxide
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
EP08736529A
Other languages
German (de)
English (en)
Other versions
EP2143131B1 (fr
Inventor
Detlef Günther
Lothar Vollmer
Andreas Ponnier
Andreas Naujoks
Jürgen Becker
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
Osram GmbH
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 Osram GmbH filed Critical Osram GmbH
Publication of EP2143131A2 publication Critical patent/EP2143131A2/fr
Application granted granted Critical
Publication of EP2143131B1 publication Critical patent/EP2143131B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H01J61/366—Seals for leading-in conductors
    • H01J61/368—Pinched seals or analogous seals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/46—Leading-in conductors
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/28—Manufacture of leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/40—Leading-in conductors
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]

Definitions

  • the invention relates to a method for producing a molybdenum foil for lamp construction according to the preamble of patent claim 1 and such a molybdenum foil and a lamp with such a molybdenum foil.
  • molybdenum foils can be embedded gas-tight in quartz glass vessels and therefore serve as a component of power supply lines for light sources, which are enclosed in a gastight manner by lamp vessels made of quartz glass.
  • This use of molybdenum foils is described for molybdenum foils having a thickness of less than 20 micrometers, for example in German patent specification DE 573 448 and for thicker molybdenum foils, for example in British patent specification GB 474 982.
  • molybdenum foil refers in the following and in the sense of the invention described below to metal foils based on molybdenum, which consist essentially of molybdenum.
  • molybdenum foil comprises metal foils which consist of molybdenum or of molybdenum provided with additives or dopants, the weight fraction of the additives or dopants being significantly lower than the weight fraction of molybdenum in the metal foil.
  • molybdenum foil also includes a metal foil consisting of molybdenum admixed with about 1 percent by weight of yttrium oxide or yttrium-cerium mixed oxide. 2007 08807 - 2 -
  • US Pat. No. 4,587,454 discloses a method for producing a molybdenum foil for lamp construction, according to which the surface of the molybdenum foil is roughened by sand blasting, thereby preventing cracks or cracks in the quartz glass of the lamp vessel surrounding the molybdenum foil.
  • the published patent application EP 1 156 505 A1 describes a molybdenum foil for use as a component of current feedthroughs through lamp vessels, wherein the molybdenum foil has substantially non-contiguous, island-like regions of substance agglomerates with surface structure different from the raw foil or or and on 5 to 60 area percent of their surface Material composition of molybdenum or its alloys, of titanium, of silicon or of an oxide, a mixed oxide or or and an oxidic compound having a vapor pressure of less than 10 millibars at 2000 0 C has.
  • US Pat. No. 6,815,892 discloses a molybdenum foil for lamp construction, the entire surface of which is provided with a coating.
  • the coating consists of a metal oxide from the group of titanium oxide, lanthanum oxide, tantalum oxide, zirconium oxide, yttrium oxide and hafnium oxide.
  • the inventive method for producing a molybdenum foil for lamp construction is characterized in that at least part of the surface of the molybdenum foil, preferably the entire surface of the molybdenum foil, is roughened by sandblasting and the sandblasting agent used for this purpose is aluminum oxide or or quartz sand and at least one other Component contains.
  • the sand blasting according to the invention forms deposits of fine particles of the sand blasting agent on the surface of the molybdenum foil, that is to say deposits of aluminum oxide particles and / or quartz sand particles and particles of the at least one further sandblasting agent component which together with the roughened surface of the molybdenum foil for the good Adhesion between the molybdenum foil and the lamp vessel material are responsible.
  • the homogeneously distributed amount of the sandblasting agent particles deposited on the surface of the molybdenum foil with a low surface occupation density is not sufficient to form a closed layer or island-like agglomerates on the molybdenum foil surface.
  • the deposits formed by the blasting according to the invention on the molybdenum foil surface in a small amount have the advantage that they do not hinder the welding of the molybdenum foil to other power supply parts.
  • the molybdenum foil produced by the process according to the invention can be welded with low contact resistance and in a simple manner with a gas discharge electrode made of tungsten projecting into the discharge space and with a power supply wire protruding from the discharge vessel, for example by resistance welding according to EP 1 066 912 A1 or by means of LASER welding according to EP 1 604 2007 08807
  • the main component of the sandblasting agent is formed by alumina or quartz sand or a mixture of alumina and silica sand. That is, alumina or silica sand or the mixture of alumina and silica sand have the largest weight fraction in the sandblasting agent. With the help of this main component in the sandblasting agent, a roughening of the surface of the molybdenum foil and a densification of the molybdenum foil are achieved.
  • the proportion by weight of the alumina or quartz sand in the sandblasting agent is greater than 99% by weight and the proportion by weight of the at least one further component in the sandblasting agent is less than 1% by weight.
  • sandblasting agent consisting of alumina and / or quartz sand and titanium oxide and in which the proportion by weight of titanium oxide is in the range from 0.1% by weight to 0.25% by weight.
  • titanium oxide instead of titanium oxide or in addition to titanium oxide, one or more oxides from the group of zirconium oxide, hafnium oxide, lanthanum oxide, cerium oxide and tantalum oxide can also be used as a further component in addition to aluminum oxide or or quartz sand.
  • titanium oxide and ruthenium instead of titanium oxide and ruthenium can be used as a further component in addition to aluminum oxide or or and the quartz sand in the sandblasting agent. 2007 08807
  • the particle size of the at least one further component in the sandblasting agent is advantageously less than or equal to 1 micrometer in order to ensure sufficiently good adhesion of the particles of the at least one further component to the rough molybdenum foil surface.
  • the average particle size of the main component of the sandblasting agent formed by aluminum oxide or quartz sand is advantageously less than or equal to 100 micrometers in order to achieve the aforementioned roughening of the surface of the molybdenum film and compaction of the molybdenum foil.
  • the molybdenum foil according to the invention is preferably suitable as a component of current feedthroughs through lamp vessels of glass, in particular of quartz glass or of a glass with a very high silicon dioxide content.
  • the molybdenum foil according to the invention is gas-tight embedded in lamp vessels made of quartz glass, so that one end of the molybdenum foil is connected to a protruding from the lamp vessel power supply wire and its other end is connected to a projecting into the interior of the lamp vessel electrode or with a Glüh mindfullabgang.
  • the molybdenum foil according to the invention thus ensures a gas-tight current feedthrough through a quartz glass lamp vessel or from a glass with a very high, usually more than 95 percent by weight silicon dioxide content.
  • Figure 1 is a schematic, partially sectioned view of a molybdenum foils according to the invention for the construction of lamps
  • FIG. 2 A schematic representation of a metal halide high-pressure discharge lamp according to the invention with two of the molybdenum foils depicted in FIG
  • FIG. 3 shows the percentage of the still functional, tested high-pressure metal halide discharge lamps over the service life of the
  • Figure 4 shows the percentage of still functioning, tested mercury-free metal halide high-pressure discharge lamps over the life of the high-pressure discharge lamps
  • FIG. 5 A schematic representation of the distribution of fine-grained aluminum oxide particles and titanium oxide particles on the surface of the molybdenum foil
  • FIG. 1 shows a schematic, partially sectioned illustration of a molybdenum foil 21 according to the invention.
  • This molybdenum foil 21 is arched in a lenticular or lancet-shaped or pillow-shaped manner.
  • this molybdenum 200708807 is arched in a sealing film in the discharge vessel of a metal halide high-pressure discharge lamp with an electrical power consumption of approximately 35 watts.
  • the molybdenum foil 21 has a maximum thickness D of 25 microns. Its length L in the longitudinal direction is 6.5 millimeters and its width B is 2 millimeters.
  • the molybdenum foil 21 is usually cut off from a molybdenum strip which is rolled up on a supply roll. In this case, the cut surfaces run perpendicular to the longitudinal extent of the molybdenum foil 21. In order to reduce the risk of crack formation in the lamp vessel material surrounding the molybdenum foil, the cut edges of the molybdenum foil 21 can be flattened or rolled, as disclosed, for example, in EP 0 884 763 A2.
  • the molybdenum foil 21 according to the invention is produced from the known metallurgical annealing processes and sintering processes as well as rolling processes from molybdenum powder pressed into a mold.
  • the molybdenum powder may be dopants or additives, such as the above-mentioned oxides yttrium oxide or yttrium-cerium mixed oxide mixed.
  • the molybdenum foil 21 produced in this way is sandblasted on both sides with a homogeneous mixture of aluminum oxide and titanium oxide, the proportion by weight of titanium oxide in the sandblasting agent being 0.1 percent by weight and the balance being aluminum oxide, which is also known as Corundum is called is.
  • the average particle size of the alumina particles is 100 microns and the average particle size of the titanium oxide particles is 0.5 microns. 2007 08807
  • the finer-grained titanium oxide particles have better adhesion to the molybdenum foil surface than the aluminum oxide particles. Therefore, the proportion of titanium oxide particles adhering to the molybdenum foil does not correspond to its mixing ratio in the sandblasting agent.
  • a large number of molybdenum foils 21 sandblasted according to the invention were dissolved in acid.
  • the analysis revealed an average weight of the molybdenum foil of 22.5 mg / cm 2 and an average weight of the alumina particles adhering to the molybdenum foil of 0.247 mg / cm 2 and an average weight of the titanium oxide particles adhering to the molybdenum foil of 0.062 mg / cm 2 .
  • the molybdenum foil 21 is sandblasted on both sides with a homogeneous mixture of aluminum oxide and titanium oxide, whereby 2007 08807
  • the weight proportion of titanium oxide in the sandblasting agent is 0.25 percent and the balance is alumina.
  • the mean particle size of the corundum particles is 100 micrometers and the average particle size of the titanium oxide particles is 0.5 micrometers.
  • An analysis of these molybdenum foils revealed an average weight of the molybdenum foil of 18.2 mg / cm 2 and an average weight of the aluminum oxide particles adhering to the molybdenum foil of 0.197 mg / cm 2 and an average weight of the titanium oxide particles adhering to the molybdenum foil of 0.117 mg / cm 2 .
  • FIG. 2 shows a metal halide high-pressure discharge lamp with an electrical power consumption of approximately 35 watts.
  • This high-pressure discharge lamp has a discharge vessel 1 made of quartz glass with an inner space 10 and two diametrically arranged, sealed ends 11, 12, each having a current feedthrough 2, 3.
  • a discharge vessel 1 made of quartz glass with an inner space 10 and two diametrically arranged, sealed ends 11, 12, each having a current feedthrough 2, 3.
  • two diametrically arranged electrodes 4, 5 which are each connected to one of the current feedthroughs 2 or 3 and between which a gas discharge is formed during lamp operation.
  • an ionizable filling is included, which consists of xenon and several metal halides and optionally mercury.
  • the discharge vessel 1 is surrounded by an outer bulb 6, which consists of quartz glass, which is provided with ultraviolet radiation absorbing dopants.
  • the lamp also has a plastic base 7, which carries the two lamp vessels 1, 6 and which is equipped with the electrical terminals 8 of the lamp.
  • the current feedthroughs 2, 3 each have a gas-tight embedded in the respective end 11 and 12 of the invention molybdenum foil 21 and 31, respectively.
  • the molybdenum foil 21 and 31 is shown schematically.
  • the side facing away from the interior 10 of the discharge vessel 1 side of the respective molybdenum foil 21 and 31 is respectively welded to a molybdenum wire 22 and 32, which protrudes from the corresponding sealed end 11 and 12 respectively.
  • the inner side 10 of the discharge vessel 1 facing side of the respective molybdenum foil 21 and 31 is respectively welded to a rod-shaped, consisting of tungsten electrode 4 and 5, which protrude into the discharge space 10.
  • FIG. 3 shows the result of a lifetime measurement on a large number of mercury-containing metal halide high-pressure discharge lamps with the construction of the example shown in FIG. 1, but which were equipped with different molybdenum foils.
  • the lamps according to the measurement curve 1 in FIG. 3 were equipped with molybdenum foils sandblasted according to the state of the art. At 2000 hours of operation, the first of these lamps failed.
  • FIG. 3 were equipped with molybdenum foils which had a coating according to EP 1 156 505 A1. According to the measurement curve 2 in FIG. 3, 20 percent of the lamps had failed after 2500 operating hours, while 20 percent of the lamps had already failed after only 1200 operating hours in the lamps according to the measurement curve 3 in FIG.
  • the lamps which were equipped with the molybdenum foils according to the invention did not show a single failure up to an operating time of 3000 hours, as can be seen from measurement curve 4 in FIG. In particular, only in the lamps with the molybdenum foils according to the invention after 3000 operating hours, no sign of film lift was still seen.
  • FIG. 4 shows the result of a special quick-switching test on a large number of mercury-free metal halide high-pressure discharge lamps with the structure according to the example shown in FIG. 1, but which were equipped with different molybdenum foils.
  • the lamps according to the measurement curve 1 in FIG. 4 were equipped with molybdenum foils sandblasted according to the state of the art. After about 1100 hours of operation, 40 percent of these lamps already failed and after 1500 operating hours, only 20 percent of these lamps were functional and after 1700 operating hours, all lamps with uncoated molybdenum foils had failed.
  • the lamps according to the measurement curve 2 or 3 in FIG. 4 were equipped with molybdenum foils which had a coating according to EP 1 156 505 A1. Corresponding to the measuring curve 2 or 3 in FIG. 4, all lamps were extinguished after only 800 operating hours or 950 operating hours. 2007 08807
  • the mercury-free high-pressure discharge lamps which were equipped with the molybdenum foils according to the invention, on the other hand, showed no single failure up to an operating time of 1800 hours, as can be seen from measurement curve 4 in FIG. In particular, after 1800 hours of operation, no sign of a film lift in the lamps with the molybdenum foils according to the invention was yet to be seen.
  • the molybdenum foil according to the invention can also be used for other lamp types, for example for power supply by gas-tight vessels of halogen incandescent lamps.
  • the dimensions of the molybdenum foil must be adapted to the intended use.
  • the thickness D and the width B of the molybdenum foil 21 are to be adapted to the electrical power consumption of the lamp or the maximum current intensity of the lamp current.
  • the mixing ratio of aluminum oxide to titanium oxide is not limited to the two exemplary embodiments, but can be varied. 2007 08807
  • the amount of deposits on the surface of the molybdenum foil does not become so great that deterioration of the weldability with the power supply and the electrode occurs.
  • titanium oxide the above-mentioned oxides and ruthenium may be used as another component besides alumina in the sandblasting agent.
  • the alumina can be partially or completely replaced by quartz sand, so that the main component of the sandblasting agent is no longer formed by the alumina but instead by the quartz sand or a mixture of quartz sand and alumina.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'une feuille de molybdène (21) pour la construction de lampes. Selon ce procédé, une partie au moins de la surface de la feuille de molybdène (21) est rendue rugueuse par sablage. En l'occurrence, le sable de sablage contient de l'alumine et/ou du sable siliceux ainsi qu'au moins un autre composant. L'invention concerne également une telle feuille de molybdène (21) ainsi qu'une lampe comportant une telle feuille de molybdène (21).
EP08736529.2A 2007-04-27 2008-04-24 Procédé de fabrication d'une feuille de molybdène pour la construction de lampes Not-in-force EP2143131B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007020067A DE102007020067B4 (de) 2007-04-27 2007-04-27 Verfahren zur Herstellung einer Molybdänfolie für den Lampenbau und Molybdänfolie sowie Lampe mit Molybdänfolie
PCT/EP2008/054978 WO2008132123A2 (fr) 2007-04-27 2008-04-24 Procédé de fabrication d'une feuille de molybdène pour la construction de lampes, feuille de molybdène, et lampe comportant la feuille de molybdène

Publications (2)

Publication Number Publication Date
EP2143131A2 true EP2143131A2 (fr) 2010-01-13
EP2143131B1 EP2143131B1 (fr) 2015-08-19

Family

ID=39642694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08736529.2A Not-in-force EP2143131B1 (fr) 2007-04-27 2008-04-24 Procédé de fabrication d'une feuille de molybdène pour la construction de lampes

Country Status (6)

Country Link
US (1) US8408961B2 (fr)
EP (1) EP2143131B1 (fr)
JP (2) JP2010524707A (fr)
CN (1) CN101663729B (fr)
DE (1) DE102007020067B4 (fr)
WO (1) WO2008132123A2 (fr)

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Also Published As

Publication number Publication date
JP2010524707A (ja) 2010-07-22
CN101663729A (zh) 2010-03-03
JP2013008705A (ja) 2013-01-10
WO2008132123A2 (fr) 2008-11-06
DE102007020067A1 (de) 2008-11-06
US8408961B2 (en) 2013-04-02
EP2143131B1 (fr) 2015-08-19
DE102007020067B4 (de) 2013-07-18
WO2008132123A3 (fr) 2009-04-16
US20100127610A1 (en) 2010-05-27
JP5372236B2 (ja) 2013-12-18
CN101663729B (zh) 2014-07-09

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