• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a metal halide lamp comprising a ceramic housing (2) and a current conductor (3) arranged in the ceramic housing, according to the invention, the part of the current conductor (3) inserted by vitrification represents a niobium alloy doped with phosphorus, in particular doped with phosphorus in an amount of 50 ppm to 5% by weight. Preferably, the part of the current conductor (3) inserted by vitrification within the ceramic container (2) has a protectin (4) against halides, which is connected to a tungsten electrode.
    公开号:BE1019088A3
    申请号:E200800527
    申请日:2008-09-23
    公开日:2012-03-06
    发明作者:Bernd Spaniol
    申请人:Heraeus Gmbh W C；
    IPC主号:
    专利说明:

    Current conductor - through ceramic burners in metal halide lamps.
    The present invention relates to a current conductor through ceramic burners in metal halide lamps.
    During the realization of the electrode system and the vitrification thereof in the ceramic housing, it is necessary to pass through heat treatment processes that soften the niobium-based current conduction pins. The niobium-zirconium-1 alloy used for this purpose softens during manufacture. This phenomenon gives rise to a waste during manufacture because the pins are likely to bend, or an increase in expenses during manufacture to minimize rejection.
    EP 1 571 228 B1 discloses a niobium wire resistant to high temperatures, which is enriched with phosphorus. The doping of niobium takes place during melting by exposure to an electron beam during electric arc melting or via the manufacture of the sintered block consisting of a niobium powder, respectively by addition. phosphorus or parent alloys containing phosphorus. The phosphorus-containing alloy can be treated at room temperature to obtain a wire having diameters of 0.15 to 0.4 mm. At the temperature of 1600 ° C, the material does not yet exhibit a massive formation of coarse grains and does not become brittle. This feature is particularly advantageous for the use of tantalum capacitors.
    DE 10 2005 038 551 B3 discloses a high temperature resistant frame or wire for niobium-based one-sided plug-in lamps which is enriched with phosphorus. The wire has an elastic limit Rp 0.2 of at least 200 MPa or a tensile strength Rm of at least 300 MPa.
    US-A-4,694,219 discloses an arc discharge lamp in which a PCA, sapphire, or spinel tube is sealed at its end which abuts against a tungsten and oxide cermet. aluminum, with a mixture based on SiO 2, MgO and Al 2 O 3, comprising other additives such as, for example, phosphorus pentoxide of 2 to 5%. In US 2005/0200281 discloses a discharge lamp comprising a ceramic discharge vessel and two current conductors. Various variants are described for current conductors based on a niobium or molybdenum foil or based on a molybdenum-aluminum oxide cermet.
    The object of the present invention is to provide a current conductor through ceramic burners, which can be more easily treated than NbZr-1 pins, in particular a current conductor which, during heat treatment, does not undergo a softening such that the pins bend.
    To achieve this object, it provides current conductors to be inserted by vitrification in the ceramic burners, in particular current conduction pins constituted by a niobium alloy exhibiting a thermal resistance, doped with phosphorus.
    Particularly proven phosphorus doping in the range of 100 μg / g (ppm) to 2000 μg / g (ppm), particularly in the range of 300 μg / g (ppm) to 700 μg / g (ppm) . Preferably, the current conductor is protected against halides. For this purpose, it has proven advantageous to protect the current conductor on the inner side of the burner housing with a molybdenum winding or a cermet, to act as protection against halides.
    For the manufacture of metal halide lamps, welding and incandescent treatments are usually used, for example for reasons of purity or for relaxation. During the heat treatment, the current conductors according to the invention constituted by phosphorus doped niobium no longer bend.
    Preferably, the current conductor is incorporated in the form of a pin in the burner housing. Proven, pins having a length of 5 to 30 mm, in particular 10 to 20 mm and having a diameter of 0.2 to 2 mm, in particular 0.5 to 1.0 mm. For the manufacture of the pins, wires are formed by stretching from a phosphor doped alloy and are cut into pins, in particular stretched and lengthened. Advantageous alloys have been described in EP 1 571 228 B1 and DE 2005 038 551 B3. The pins according to the invention are suitable in particular for housings made of aluminum oxide.
    Hereinafter, the invention is explained in more detail from an example and with reference to the accompanying drawings.
    In the drawings: Figure 1 shows a longitudinal sectional view taken through a burner housing; FIG. 2 represents a diagram in which the mechanical properties of a yarn according to the invention are visualized; FIG. 3 represents the corresponding mechanical properties of a NbZrl wire known from the state of the art.
    FIG. 1 shows a burner housing 2 made of PCA (polycrystalline alumina). Inside the burner housing 2 are arranged tungsten electrodes 1 which are respectively welded to a molybdenum coil 4 or to a MoAl 2 O 3 cermet. The winding of molybdenum 4 or the MoAl203 cermet comes to be disposed in complementary form against the inner wall in a tubular part of the burner housing 2 and protects the current conductor 3 against the halides in the burner housing 2. The driver 3 is soldered into the burner housing 2 by means of a solder glass 5 and is connected to the outside of the burner, a current conductor or a frame.
    In FIG. 2, the influence of heat on the mechanical properties of a niobium wire having a thickness of 0.4 mm doped with phosphorus is shown. The softening of this phosphorus doped niobium wire, in particular the lowering of the elastic limit (Rp 0.2) in the temperature range of 1100 ° C to 1400 ° C, as is usually encountered in operations and in incandescent treatments in the fabrication of electrode systems for metal halide lamps, is less than about 50 MPa to that of the wire and niobium alloyed at 1% (Figure 3). The values provided depend on the diameter, with the thicker films being softened slightly less in the aforesaid time range of 20 minutes. Reproducibility is based on the selection of the same diameter for the phosphor-doped wire and for the NbZrl standard alloy. The elastic limit represents the technically relevant measurement from which a permanent deformation of the building elements is obtained.
    According to the invention, it is possible to obtain a 25% greater stability than manifested by the phosphor-doped wire compared to the standard niobium-based alloy NbZrl. The improvement of these mechanical properties under the influence of heat makes it possible to obtain better handling and to minimize the risk of mechanical torsion manifested by the pins during the fabrication of the electrode systems.
    权利要求:
    Claims (10)
    [1]
    A metal halide lamp comprising a ceramic housing (2) and a current conductor (3) disposed in the ceramic housing, characterized in that the portion of the vitrified-inserted current conductor (3) is a lithium-doped niobium alloy. phosphorus.
    [2]
    2. A metal halide lamp according to claim 1, characterized in that the niobium-phosphorus alloy has phosphorus content of 50 ppm to 5 by weight.
    [3]
    3. Metal halide lamp according to claim 1 or 2, characterized in that the niobium-phosphorus alloy has zirconium 0.1 to 2% by weight.
    [4]
    Metal halide lamp according to one of Claims 1 to 3, characterized in that the part of the current conductor (3) inserted by vitrification into the ceramic container (2) has a protection (4) against the halides. which is connected to a tungsten electrode.
    [5]
    5. Metal halide lamp according to claim 4, characterized in that the protection (4) is a cermet or winding based on molybdenum.
    [6]
    6. Use of a current conductor (3) through a ceramic housing (2) of a metal halide lamp, characterized in that the portion of the current conductor (3) inserted by vitrification is a niobium alloy to which phosphorus confers a thermal resistance.
    [7]
    7. Use according to claim 6, characterized in that the alloy has 50 ppm to 58% by weight phosphorus, 0.1 to 2% by weight zirconium, the balance being niobium having purity of 99.8%.
    [8]
    8. Part of a vitrified current conductor (3) in the form of a pin having a length of 5 to 30 mm and a diameter of 0.2 to 2 mm, characterized in that the portion of the conductor vitrified-inserted stream (3) is a phosphorus-doped niobium alloy.
    [9]
    9. Process for the insertion of current conductors by vitrification in a ceramic burner, characterized in that a current conductor consisting of a niobium alloy to which phosphorus confers a thermal resistance is vitrified.
    [10]
    Process for the production of a metal halide lamp comprising a ceramic housing (2) and a current conductor (3) arranged in the ceramic housing (2), characterized in that the current conductor (3) is exposed, via heat treatments, at temperatures of at least 1000 ° C without softening to the point of bending.
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    同族专利:
    公开号 | 公开日
    HU0800586A2|2009-03-30|
    HU0800586D0|2008-11-28|
    US20090134797A1|2009-05-28|
    CN101399157A|2009-04-01|
    DE102007046899B3|2009-02-12|
    JP2009087941A|2009-04-23|
    引用文献:
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    CN103137423A|2011-12-05|2013-06-05|欧司朗股份有限公司|Ceramic metal halogenating lamp with improved frit seal portion|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102007046899|2007-09-28|
    DE200710046899|DE102007046899B3|2007-09-28|2007-09-28|Halogen metal vapor lamp comprises a ceramic housing and a current feed-through arranged in the ceramic housing|
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