Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01K—ELECTRIC INCANDESCENT LAMPS
  • H01K1/00—Details
  • H01K1/02—Incandescent bodies
  • H01K1/04—Incandescent bodies characterised by the material thereof
  • H01K1/08—Metallic bodies
• • 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
  • H01J9/32—Sealing leading-in conductors
  • H01J9/323—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device
  • H01J9/326—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device making pinched-stem or analogous seals
• • 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
  • 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
• • 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
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01K—ELECTRIC INCANDESCENT LAMPS
  • H01K1/00—Details
  • H01K1/18—Mountings or supports for the incandescent body
  • H01K1/24—Mounts for lamps with connections at opposite ends, e.g. for tubular lamp
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01K—ELECTRIC INCANDESCENT LAMPS
  • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
  • H01K3/06—Attaching of incandescent bodies to mount

Definitions

• the invention relates to a method for producing an electric lamp with a lamp bulb made of SiO 2 or a glass containing a high amount of SiO 2 and a power supply which comprises a film made of molybdenum or a doped molybdenum alloy squeezed into the lamp bulb.
• the foil In order to achieve a vacuum-tight squeezing or melting of the molybdenum foil in the glass, in particular in the case of silica glass or high SiO 2 -containing glasses and molybdenum in spite of the very different thermal expansion coefficients, the foil is very thin (typically 15 to 50 ⁇ m), with a high Widths to thickness ratio (typically> 50) and has tapered side edges.
• the much thicker outer and inner conductor must be welded to this thin molybdenum foil, the inner conductor often consisting of tungsten. In the case of current conductors made of tungsten in particular, this is associated with very high welding temperatures, which can lead to embrittlement and subsequently to rupture of the molybdenum foil.
• Film tears can also occur during the squeezing or melting process, on the one hand caused by the relative movement between the glass and the film, on the other hand by the build-up of tensile stresses during the cooling process, at temperatures which are below the relaxation temperature of the glass.
• DE-C-29 47 230 describes a molybdenum foil in which 0.25 to 1% yttrium oxide particles are dispersed, with the advantage that this film has better welding behavior and due to the heat input during less brittle of welding.
• An important reason for the top one 1% limit is the realization that foils with higher dispersoid contents only are formable to a limited extent and result in a too high film strength, which the Voltage reduction in the lamp base area during the cooling process negatively influenced during the crushing process and cracks in the quartz glass can lead.
• EP-B-0 275 580 describes a molybdenum alloy especially for fusible links with 0.01 to 2% by weight of Y 2 O 3 and 0.01 to 0.8% by weight of molybdenum boride, which in comparison to fusible links consists of a K -Si-doped molybdenum alloy has improved recrystallization and manufacturing properties.
• the molybdenum foil In addition to the mechanical properties of the molybdenum foil, it is also very important to improve the service life. This is determined on the one hand by the oxidation resistance of the molybdenum foil, and on the other hand by the adhesive strength between the molybdenum foil and the silica or high SiO 2 -containing glass.
• EP-B-0 691 673 describes a band-shaped power supply Molybdenum-yttrium oxide base, which additionally contains 0.03 to 1% by weight of cerium oxide a ratio of cerium oxide to yttrium oxide of 0.1 to 1. A film with this Compared to a film doped with yttrium oxide a significantly improved oxidation behavior.
• molybdenum materials doped with yttrium oxide show improved film adhesion, which can be attributed, among other things, to a surface reaction between Y 2 O 3 and SiO 2 to form an yttrium silicate.
• Improved resistance to oxidation can also be achieved by metallic coating of the molybdenum foil with Ta, Nb, V, Cr, Zr, Ti, Y, La, Sc and Hf in accordance with DE-C-30 06 846, but with the connection of the above Metals to SiO 2 is a very bad one, so that with the exception of Cr layers, these coatings have not been used in practice.
• EP-B-0 309 749 describes a fusion between molybdenum and a glass-like material, the part of the molybdenum which is exposed to the oxidizing environment being coated with alkali metal silicate. However, this does not favorably affect the connection between the molybdenum and the glass. Molybdenum nitride layers in accordance with EP-A-0 573 114, phosphide layers in accordance with EP-B-0 551 939, or SiO 2 layers in accordance with DE-A-20 58 213 have also become known for the external oxidation protection.
• DE-A-196 03 300 describes a molybdenum film which contains 0.01 to 1% by weight of silicates and / or aluminates and / or aluminates rich in alkali and alkaline earth metals from one or more elements from groups IIIb and / or IVb of the periodic table. This doping prevents the occurrence of cracks in the pinch seal due to the high mechanical stresses in the molybdenum-quartz glass composite. However, an improvement in the film adhesion compared to films which are doped with Y 2 O 3 or Y mixed oxide is not achieved.
• molybdenum foils which are doped with Y 2 O 3 or Y mixed oxide are most widespread for squeezed current leads in the lamp industry.
• the Mo / SiO 2 adhesion is often not sufficient with these power supplies.
• the object of the present invention is therefore a method for Production of an electric lamp with a glass lamp bulb and a squeezed power supply from a film made of molybdenum or to create a doped molybdenum alloy, in which the above described disadvantages are largely avoided.
• this is achieved in that a conventional sintered metallurgical and forming process before the Squeezing in the glass flask is treated in such a way that 5 to 60 percent by area of the film surface essentially not contiguous island-like areas of material agglomerates with of the Raw film of different surface structure and / or Material composition made of molybdenum or its alloys Titanium, from silicon or from an oxide, a mixed oxide and / or one oxidic compound with a vapor pressure of less than 10 mbar each arise at 2,000 ° C.
• Oxides such as Al 2 O 3 , ZrO 2 , Y 2 O 3 , TiO 2 , silicates, aluminates, but also Mo, Ti, Si or their alloys are suitable as materials for the material agglomerates.
• the average size of the individual fabric agglomerates is advantageously less than 5 ⁇ m.
• the material agglomerates of Yttrium oxide or yttrium mixed oxide exist.
• the material agglomerates of Titanium oxide or titanium mixed oxide exist.
• a slip consisting of 350 g of 99.7% titanium silicate powder with an average particle size of the primary particles of 630 nm, 50 g of nitrocellulose and 750 ml of alcohol-based solvent was prepared as described in Example 1 and applied to a pickled Mo-Y mixed oxide Foil measuring 2.5 mm ⁇ 0.025 mm (Y 2 O 3 content: 0.48% by weight, Ce 2 O 3 content: 0.07% by weight) was applied.
• a slip consisting of 400 g of 99.2% pure yttrium silicate powder with an average grain size of the primary particles of 840 nm, 50 g of nitrocellulose and 750 ml of alcohol-based solvent was prepared as described in Example 1 and applied to a pickled Mo-Y mixed oxide Foil measuring 2.5 mm ⁇ 0.025 mm (Y 2 O 3 content: 0.48% by weight, Ce 2 O 3 content: 0.07% by weight) was applied. This was then annealed in a single pass at a temperature of 1,200 ° C in dry hydrogen. The area fraction of the yttrium silicate particles was 29%, with an average yttrium silicate agglomerate size of 3.2 ⁇ m.
• a slip consisting of 250 g of 99.9% pure silicon powder with an average particle size of the primary particles of 210 nm, 50 g of nitrocellulose and 750 ml of alcohol-based solvent was prepared as described in Example 1 and applied to a pickled Mo-Y mixed oxide Foil measuring 2.5 mm ⁇ 0.025 mm (Y 2 O 3 content: 0.48% by weight, Ce 2 O 3 content: 0.07% by weight) was applied. This was then annealed in a single pass at a temperature of 950 ° C in dry hydrogen. The area fraction of the Si / MoSi 2 particles was 13%, with an average Si / MoSi 2 agglomerate size of 2.3 ⁇ m.
• a slip consisting of 1,000 g of 99.98% pure molybdenum powder with an average particle size of the primary particles of 1.5 ⁇ m, 50 g of nitrocellulose and 750 ml of alcohol-based solvent was prepared as described in Example 1 and on a Mo-Y film (Y 2 O 3 content: 0.48% by weight, Ce 2 O 3 content: 0.07% by weight) of dimensions 2.5 mm x 0.025 mm, the side edges of which were shaped like knife-edge edges by mechanical deformation (edge angle 25 °) , applied. This was then annealed in dry hydrogen at a temperature of 1,400 ° C.
• the area fraction of the Mo particles was approximately 50% with a medium one Mo agglomerate size of 2.9 ⁇ m.
• the films according to the invention from Examples 1 to 5 were used for In the usual way, 20 MR 16 halogen lamps each.
• 20 MR 16 halogen lamps each.
• Standard Mo-Y mixed oxide foils such as they also for the production of the coated films according to the examples 2 to 4 were used in the uncoated state for the production of 20 MR 16 halogen lamps used.
• 10 lamps were placed under each usual operating conditions at a base temperature of 400 ° C, the remaining 10 lamps under difficult operating conditions with a Base temperature of 450 ° C, operated until its failure.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Vessels And Coating Films For Discharge Lamps (AREA)
• Glass Compositions (AREA)

Applications Claiming Priority (2)

Publications (2)

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Cited By (5)

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• 2000
  • 2000-05-18 AT AT0036300U patent/AT4408U1/de not_active IP Right Cessation
• 2001
  • 2001-05-14 DE DE50114832T patent/DE50114832D1/de not_active Expired - Lifetime
  • 2001-05-14 EP EP01111636A patent/EP1156505B1/fr not_active Expired - Lifetime
  • 2001-05-16 JP JP2001146351A patent/JP4782307B2/ja not_active Expired - Fee Related
  • 2001-05-17 KR KR1020010026955A patent/KR100859235B1/ko not_active IP Right Cessation
  • 2001-05-18 US US09/861,421 patent/US6753650B2/en not_active Expired - Fee Related

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