[go: up one dir, main page]

WO2015188970A1 - Matériau d'électrode, électrode de bougie d'allumage, et bougie d'allumage - Google Patents

Matériau d'électrode, électrode de bougie d'allumage, et bougie d'allumage Download PDF

Info

Publication number
WO2015188970A1
WO2015188970A1 PCT/EP2015/058951 EP2015058951W WO2015188970A1 WO 2015188970 A1 WO2015188970 A1 WO 2015188970A1 EP 2015058951 W EP2015058951 W EP 2015058951W WO 2015188970 A1 WO2015188970 A1 WO 2015188970A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode material
spark plug
electrode
proportion
rhodium
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.)
Ceased
Application number
PCT/EP2015/058951
Other languages
German (de)
English (en)
Inventor
Benedikt REINSCH
Stefan Nufer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2015188970A1 publication Critical patent/WO2015188970A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/39—Selection of materials for electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper

Definitions

  • the present invention relates to an electrode material, a
  • Spark plug electrode and a spark plug containing this electrode material are provided.
  • the life of a spark plug is determined mainly by the corrosion and erosion resistance of the electrode material. Due to the removal of electrode material in the spark plasma and oxidation phenomena, the electrode gap is widened, which ultimately leads to failure of the spark plug.
  • noble metal electrode materials are used, e.g. based on platinum or gold. These precious metals are characterized by a good
  • the electrode material according to the invention in particular as
  • spark plug electrode material has high oxidation stability coupled with good corrosion stability and, moreover, has a high melting point, which leads to a very low wear rate even under harsh conditions, such as those prevailing in a combustion chamber of a motor vehicle.
  • This is achieved by a noble metal alloy containing as essential elements rhenium (Re), ruthenium (Ru) and rhodium (Rh) and is thus at least ternary alloyed. Higher alloyed systems are also possible.
  • a proportion of rhodium in the ternary noble metal alloy leads to selective rhodium oxidation at the surface of the electrode material due to selective oxidation
  • Enriched electrode material and inhibits the oxidation tendency of the material due to its intrinsic properties. For this purpose, it is necessary that the rhodium is initially homogeneously dissolved in the electrode material.
  • the Lösigeslimit of rhodium can preferably be increased and thus a proportion of rhodium in preferred amounts are alloyed. Even high proportions of rhodium can be alloyed in very well and stably, which significantly reduces the wear rate of the electrode material.
  • An advantageous development of the electrode material according to the invention is characterized in that a proportion of rhenium greater than 40 wt .-% and in particular greater than 50 wt .-%, based on the total weight of
  • Electrode material is. As a result, the basic corrosion stability of the
  • the oxidation characteristic of the electrode material can be improved and an oxidation tendency can be reduced.
  • a content of rhodium which is preferably from 1% by weight to 49.9% by weight based on the total weight of the electrode material
  • Proportion of rhodium from 5 wt .-% to 30 wt .-%, also based on the total weight of the electrode material, particularly advantageous.
  • Alloy components has been found to nickel, in particular in a proportion of at most 8 wt .-% and in particular of at most 5 wt .-%, based on the total weight of the electrode material, the cost structure of the electrode material without significant negative effect on the
  • Oxidation stability or the melting point lowers.
  • the precious metal is for this purpose in particular selected from the group consisting of: Pt, Au, Pd, Ir and Ag, and is further advantageous in a proportion of not more than 5 wt .-% and
  • spark plug electrode comprising an electrode material as disclosed above is also described.
  • Spark plug electrode is not limited in shape and dimension and may further be formed both as a ground electrode and as a center electrode of a spark plug.
  • the spark plug electrode is characterized by a low, spark-induced wear rate due to the high melting point and the very good oxidation stability of the electrode material.
  • a spark plug which comprises at least one spark plug electrode comprising the inventive
  • the spark plug electrode may be shaped as above. Particularly advantageous in the light of a large change interval for the spark plug, containing both a ground electrode and a
  • Electrode material As a result, a mileage of the spark plug of over 100,000 km can be achieved.
  • the advantages, advantageous effects and developments described for the electrode material according to the invention also find application to the spark plug electrode according to the invention and the spark plug according to the invention.
  • FIG. 1 shows a schematic representation of a spark plug electrode according to an advantageous development of the invention when new
  • FIG. 2 is a schematic representation of a spark plug electrode according to an advantageous embodiment of the invention after Befunkung
  • FIG. 3 shows a micrograph of the electrode material of the spark plug electrode from FIG. 2,
  • FIG. 4 shows a ternary phase diagram of the material system ReRuRh and
  • Figure 5 is a schematic representation of an inventive
  • Figure 1 is a schematic representation of a spark plug electrode 1 in the new state, which is exemplified as a center electrode 3. However, the training as a ground electrode is also possible.
  • the spark plug electrode 1 is connected by a connection zone 2 to the center electrode 3.
  • Connection zone 2 separates the center electrode 3 from the
  • the electrode material of the spark plug electrode 1 comprises a ternary or higher alloyed noble metal alloy containing at least the elements Rh, Ru and Re, where Re is a main constituent in wt .-%, based on the other alloy constituents of the electrode material according to the invention, ie also their respective proportions in wt .-%, represents.
  • Spark plug electrode 1 regularly and evenly formed and consist of the spark plug electrode material.
  • FIG. 2 is a schematic representation of the spark plug electrode 1 after Befunkung. Through the Befunkung, in particular by selective oxidation, a rhodium-rich layer 4 has formed on the entire surface.
  • FIG. 3 is a photomicrograph of a scanning electron micrograph of a region of the spark plug electrode 1 from FIG. 2. The micrograph was created after firing. For this purpose, investigations were carried out on a laboratory test bench. The effects achieved are transferable to the use of the spark plug electrode in an engine compartment of an internal combustion engine.
  • the test stand was designed so that several spark plugs, each comprising a spark plug electrode formed as a center electrode of Figure 1, were focussed in parallel under the same conditions.
  • the following spark plugs each comprising a spark plug electrode formed as a center electrode of Figure 1, were focussed in parallel under the same conditions.
  • FIG. 3 shows the micrograph of one of the samples. Evident is a homogeneous inside the electrode material
  • Alloy structure 5 which has surface regions 6 with rhodium oxide. Furthermore, a rhodium-rich layer 4 can be seen as a cover layer comprising high Rh enrichments.
  • Oxidation stability the oxidation behavior is henceforth determined by the rhodium-rich layer 4 and a spark erosive wear of the electrode material is reduced.
  • a noble metal volume fraction remains essentially constant over the duration of the firing, which is indicated by a substantially constant electrode spacing in the spark plugs.
  • FIG. 4 shows a phase diagram for the ternary alloy system ReRuRh for temperatures below 2000K. Particularly good wear properties are obtained for ternary alloys which lie in the region between the solid and the dashed line.
  • a proportion of rhenium is thus advantageously more than 40% by weight and in particular more than 50% by weight, based on the total weight of the electrode material.
  • a proportion of rhodium is furthermore advantageously from 1% by weight to 49.9% by weight, preferably from 5% by weight to 30% by weight.
  • FIG. 5 shows a schematic representation of a spark plug 10.
  • the spark plug 10 comprises a ground electrode 9, a center electrode 3, to which a
  • Spark plug electrode 1 is connected by means of a connection zone 2, and an insulator 11.
  • a housing 7 at least partially surrounds the insulator 11.
  • a thread 12 is arranged, which is designed for attachment of the spark plug 10 in a cylinder head 8.
  • the center electrode contained in the spark plug 10 corresponds to the spark plug electrode 1 of FIG. 1 and thus contains the electrode material according to the invention.
  • the ground electrode 9 also comprises the electrode material according to the invention.
  • the spark plug 10 has a very low tendency to oxidation and is characterized due to low wear and a concomitant high

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Spark Plugs (AREA)

Abstract

La présente invention concerne un matériau d'électrode ternaire ou superallié. Ledit matériau d'électrode contient du rhénium, du ruthénium et du rhodium, la part du rhénium en pourcentage en poids constituant la part principale, rapportée aux constituants restants du matériau d'électrode. Le matériau d'électrode convient particulièrement bien en tant que matériau d'électrode de bougie d'allumage.
PCT/EP2015/058951 2014-06-10 2015-04-24 Matériau d'électrode, électrode de bougie d'allumage, et bougie d'allumage Ceased WO2015188970A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014210987.6 2014-06-10
DE102014210987.6A DE102014210987A1 (de) 2014-06-10 2014-06-10 Elektrodenmaterial, Zündkerzenelektrode und Zündkerze

Publications (1)

Publication Number Publication Date
WO2015188970A1 true WO2015188970A1 (fr) 2015-12-17

Family

ID=53008494

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/058951 Ceased WO2015188970A1 (fr) 2014-06-10 2015-04-24 Matériau d'électrode, électrode de bougie d'allumage, et bougie d'allumage

Country Status (2)

Country Link
DE (1) DE102014210987A1 (fr)
WO (1) WO2015188970A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB591420A (en) * 1944-03-14 1947-08-18 Mallory Metallurg Prod Ltd Improvements in or relating to spark gap or sparking plug electrodes
EP0334981A1 (fr) * 1987-02-14 1989-10-04 Toho Kinzoku Co., Ltd. Matériau d'électrode à décharge
EP1677400A2 (fr) * 2004-12-28 2006-07-05 Ngk Spark Plug Co., Ltd Bougie d'allumage
EP2554690A1 (fr) * 2010-04-02 2013-02-06 NGK Sparkplug Co., Ltd. Bougie d'allumage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1276332B (de) * 1964-11-07 1968-08-29 Heraeus Gmbh W C Verwendung einer Legierung auf Ruthenium-Rhenium-Basis als Werkstoff zur Herstellung von Schreibfederspitzen
US3480429A (en) * 1969-01-23 1969-11-25 Heraeus Gmbh W C Alloy for pen points
DE112012004420B4 (de) * 2011-10-24 2018-03-29 Federal-Mogul Ignition Co. Verfahren zum Herstellen einer Elektrode einer Zündkerze und Zündkerzen-Herstellungsverfahren
DE102012200606A1 (de) * 2012-01-17 2013-07-18 Robert Bosch Gmbh Elektrisch leitfähiges Material
DE102013106564B4 (de) * 2012-06-26 2018-03-29 Federal-Mogul Ignition Co. Verfahren zum Herstellen eines Elektrodenmaterials für eine Zündkerze und Ruthenium-basiertes Material zur Verwendung in einer Zündkerze

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB591420A (en) * 1944-03-14 1947-08-18 Mallory Metallurg Prod Ltd Improvements in or relating to spark gap or sparking plug electrodes
EP0334981A1 (fr) * 1987-02-14 1989-10-04 Toho Kinzoku Co., Ltd. Matériau d'électrode à décharge
EP1677400A2 (fr) * 2004-12-28 2006-07-05 Ngk Spark Plug Co., Ltd Bougie d'allumage
EP2554690A1 (fr) * 2010-04-02 2013-02-06 NGK Sparkplug Co., Ltd. Bougie d'allumage

Also Published As

Publication number Publication date
DE102014210987A1 (de) 2015-12-17

Similar Documents

Publication Publication Date Title
DE112012002699B4 (de) Zündkerze und Verfahren zum Herstellen einer Elektrode einer Zündkerze
DE102010027463B4 (de) Zündkerze und Verfahren zu ihrer Herstellung
DE112018006461T9 (de) Zündkerzenelektrode und Zündkerze
DE112012000411B4 (de) Ruthenium-basierte Elektrodenlegierung für eine Zündkerze, Zündkerzen-Elektrode und Zündkerze
EP2514052B1 (fr) Electrode de bougie d'allumage produite à partir d'un matériau d'électrode amélioré
DE102013102592B4 (de) Koronazündeinrichtung mit bedeckter Zündspitze
DE102014101607A1 (de) Elektrodenkernmaterial für Zündkerzen
WO2015188970A1 (fr) Matériau d'électrode, électrode de bougie d'allumage, et bougie d'allumage
EP2697405A1 (fr) Matériau d'électrode de bougie d'allumage et bougie d'allumage
DE102013007316A1 (de) Elektrodenmaterial für eine Zündkerze
DE102013210453B4 (de) Zündkerzenelektrode und Zündkerze
DE10348778B3 (de) Elektrode für eine Zündkerze und Verfahren zum Herstellen einer Elektrode
DE102008043225A1 (de) Zündkerzenelektrode hergestellt aus verbessertem Zündkerzenelektrodenmaterial
EP2186173B1 (fr) Électrode de bougie d'allumage, fabriquée à partir d'un matériau d'électrode amélioré
DE102013210456B4 (de) Zündkerze mit sich bildender nickelreicher Schutzschicht
DE102013210447B4 (de) Zündkerzenelektrode mit Nickel-Rhodium-Beschichtung, sowie Verfahren zur Herstellunq und Zündkerze mit einer solchen Zündkerzenelektrode
WO2006111444A1 (fr) Electrode destinee a une bougie d'allumage
EP3763845B1 (fr) Alliage de magnesium et son procédé de fabrication
DE102015213620A1 (de) Zündkerzenelektrode, Zündkerze und Verfahren zum Befunken einer Zündkerzenelektrode
DE102022202816A1 (de) Zündkerzenelektrodenedelmetallpin, Zündkerzenelektroden, Zündkerze und Verfahren zur Herstellung der Zündkerzenelektroden
DE2645759A1 (de) Verbesserte zuendvorrichtung, elektrode und elektrodenmaterial
DE102010055120A1 (de) Zündkerze
WO2015189005A1 (fr) Électrode de bougie d'allumage, son procédé de fabrication et bougie d'allumage correspondante
DE2042200A1 (de) Legierung fuer Zuendkerzenelektroden
DE102011007525A1 (de) Zündkerze

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15718869

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15718869

Country of ref document: EP

Kind code of ref document: A1