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WO2006032558A1 - Procede pour noyer un fil metallique dans un element ceramique - Google Patents

Procede pour noyer un fil metallique dans un element ceramique Download PDF

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Publication number
WO2006032558A1
WO2006032558A1 PCT/EP2005/053569 EP2005053569W WO2006032558A1 WO 2006032558 A1 WO2006032558 A1 WO 2006032558A1 EP 2005053569 W EP2005053569 W EP 2005053569W WO 2006032558 A1 WO2006032558 A1 WO 2006032558A1
Authority
WO
WIPO (PCT)
Prior art keywords
ceramic
wire
pyrolysis
metallic wire
polymer
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/EP2005/053569
Other languages
German (de)
English (en)
Inventor
Alexander Klonczynski
Laurent Jeannel
Martin KÖHNE
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
Priority to EP05771983A priority Critical patent/EP1794502A1/fr
Publication of WO2006032558A1 publication Critical patent/WO2006032558A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/02—Apparatus or processes specially adapted for manufacturing resistors adapted for manufacturing resistors with envelope or housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/028—Housing; Enclosing; Embedding; Filling the housing or enclosure the resistive element being embedded in insulation with outer enclosing sheath
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F23Q2007/004—Manufacturing or assembling methods

Definitions

  • the invention relates generally to a method of embedding a metallic wire in a ceramic heating element according to the preamble of the independent claim. Specifically, the invention relates to the contacting of a metallic wire with a ceramic heating element in a ceramic glow plug.
  • amorphous SiOC ceramics are obtained by pyrolysis of elemental organic precursors.
  • Advantages of the precursor thermolysis process compared to the conventional production methods for ceramics (sintering) are the significantly lower process temperatures and the simple processability and moldability of polysiloxane resins.
  • Starting material for the production of the ceramic composite material is a polysiloxane, ie, a polymer of Si, C, O and H, which is mixed with various fillers. Due to the choice of fillers, the electrical and physical property profile of the resulting after the pyrolysis ceramic composite material of the glow plug is tailored exactly to the requirements profile.
  • the use of an oxygen-containing polysiloxane precursor as starting material allows easy processability in air and thus the production of low-cost products.
  • the pyrolysis product of the filled polysiloxane has a good strength, high chemical stability, for example. against oxidation and corrosion and is harmless to health. In general, one of the major advantages of the precursor thermolysis process over conventional ceramic composite fabrication techniques is the possibility of having a wider range of fillers available.
  • the polysiloxane resins as meltable thermosetting polymers which are soluble in organic solvents, allow a simple and extremely homogeneous incorporation of fillers into the precursor, for example by kneading or dissolving. This is so interesting because with a large selection of fillers, the properties of the precursor composite material can be adjusted over a wide range.
  • polysiloxanes In addition to polysiloxanes, polysilsesquioxanes, polysilanes, polycarbosilanes, polyborosilazanes, mixtures of aminoplasts with nanopowders of metals, intermetallics and metal alloys, and aluminoxanes may also be used.
  • One possibility is contacting via a, e.g. conductive layer applied by electrodeposition after the pyrolysis process and the subsequent connection by interference fit with the contact pin, i.e., with the metallic connector.
  • Another possibility is to solder the joint between wire and ceramic pin.
  • the aim of the present invention is therefore to avoid the disadvantages of the prior art and to provide a solderless connection between ceramic heating element and metallic wire. It should be noted that the present invention is not can only be applied to ceramic glow plugs, but can be made using the inventive method any heating elements.
  • the inventive method for embedding a metallic wire in a ceramic component of precursor ceramic has the advantage over the prior art that the ceramic can be mechanically reinforced in a simple manner.
  • Another advantage is that it can be realized in an easy way an electrical connection between the ceramic pin and metallic wire without an additional drilling step.
  • the integration of the contacting wire can take place during the shaping process.
  • Another advantage is that in addition to the drilling step, the previously required soldering step can be omitted.
  • the effective fading of the precursor ceramic can be kept very low on the contact wire, but at the same time a subsequent penetration of air is prevented.
  • the core of the invention is the realization of a mechanical and an electrical connection between a metallic wire and a ceramic heating element.
  • the compound is realized by the pyrolysis of a green body and a wire integrated into this green belt.
  • the metallic wire is coated prior to the production of the green body with a plastic layer of defined thickness to compensate for the shrinkage of the precursor ceramic during the subsequent heat treatment.
  • the coating decomposes during pyrolysis before the shrinkage of the precursor ceramic begins and thereby creates a cavity between the contact wire and the precursor ceramic. Through this cavity, the effective fading of the precursor ceramic is limited to a value as low as possible, but at the same time high enough to prevent a later penetration of air and to avoid the associated oxidation.
  • thermo-oxidatively very stable electrical contact is created.
  • the production of the above-mentioned cavity immediately after decomposition of the coating allows the precursor ceramic to disappear until the cavity is closed, without thereby mecanicschwinden on the contact wire. Only when the cavity is closed does the precursor ceramic shrink onto the contact wire. Only by this disappearance arise stresses in the precursor ceramic.
  • the coating of the contact wires is preferably carried out by means of suitable solvent-containing lacquer-like preparations, which are applied to the wire in particular by means of the technique of wire coating.
  • the layer thickness of the plastic coating must be chosen so that it largely compensates for the shrinkage of the precursor ceramic and only so much
  • the wire should be chosen for its properties such that its coefficient of thermal expansion (X D) is less than or equal to the thermal expansion coefficient ⁇ p of the precursor ceramic.
  • the shrinkage must be so far advanced after the heat treatment in an inert atmosphere that the contact wires sit airtight in the precursor ceramic and the Nachschwindung the precursor ceramic during further heat treatment in air is so low that can build up no harmful tensile stresses.
  • the molded article of the precursor precursor ceramic is subjected to a heat treatment process as follows:
  • Furnace Type HTK8 (Gero GmbH, Germany) Atmosphere: Argon 4.9 (purity 99.9999% argon)
  • composition polypropylene glycol methyl ether
  • An alternative to the oxidation protection layer described above is e.g. the coating with an aqueous suspension containing alumina and silica as fillers and inorganic binders.
  • This coating produces an aluminosilicate layer during the heat treatment which prevents the oxygen from reaching the contact wire.
  • the wire is immersed in the aqueous suspension Ceramic-Coating HE (manufacturer: Office of Applied Mineralogy Germany, composition: aluminosilicate) and the coating is allowed to air-dry. Subsequently, the heat treatment is carried out in air.
  • Ceramic-Coating HE manufactured by Manufacturing of Applied Mineralogy Germany, composition: aluminosilicate
  • Type HTRH (Gero GmbH, Germany) - Heating with lOOK / min, until 1300 ° C are reached;
  • the metallic wire is then at least partially encapsulated with a polymer after the coating, it is during the pyrolysis of the bonding wire with the ceramic pin by means of the resulting pressure caused by the shrinkage of the material during pyrolysis, ie, the conversion of the polymer into the ceramic, is applied, pressed.
  • the resulting pressure caused by the shrinkage of the material during pyrolysis ie, the conversion of the polymer into the ceramic
  • Material properties eg. The coefficient of thermal expansion of the wire, as well as its geometry can be selectively varied.
  • an alternative to coating the wire with a polymer is the coating with active solder.
  • a suitable device for example a lead frame
  • the tubular wire coated with active solder is positioned and held in the cavity of the injection molding tool.
  • the active solder is intended to provide a suitable and good connection (contact) to the ceramic material.
  • all materials can be used that meet the requirements mentioned below, eg Ni, W or MoSi 2 .
  • the wire is overmolded with an organometallic polymer.
  • the elemental organic polymer may in this case be any transfermolding or injection-moldable polymer with suitable fillers. Examples can be found in the European patent EP 0 412 428 B1.
  • the shaped body In connection to the transfer molding process, the shaped body is ground and then pyrolyzed. Due to the shrinkage occurring during the pyrolysis of the wire is pressed into the ceramic. The wire is compressed by the resulting pressure, at the same time can be reduced by the tubular shape of the wire voltages. Therefore, cracking does not occur in the ceramic material.
  • the material of the wire must meet the following basic requirements:

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Resistance Heating (AREA)

Abstract

La présente invention concerne un procédé pour noyer un fil métallique dans un élément céramique au cours de la formation d'une céramique précurseur à partir d'un corps cru, par pyrolyse de pièces moulées en polymère précurseur élémentaire organique contenant de l'oxygène. Le fil métallique est entouré par injection au moins partielle d'un polymère, pendant ou après la réalisation du corps cru, avant la pyrolyse.
PCT/EP2005/053569 2004-09-22 2005-07-22 Procede pour noyer un fil metallique dans un element ceramique Ceased WO2006032558A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05771983A EP1794502A1 (fr) 2004-09-22 2005-07-22 Procede pour noyer un fil metallique dans un element ceramique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004045815.4 2004-09-22
DE200410045815 DE102004045815A1 (de) 2004-09-22 2004-09-22 Verfahren zur Einbettung eines metallischen Drahts in einem keramischen Element

Publications (1)

Publication Number Publication Date
WO2006032558A1 true WO2006032558A1 (fr) 2006-03-30

Family

ID=34982170

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/053569 Ceased WO2006032558A1 (fr) 2004-09-22 2005-07-22 Procede pour noyer un fil metallique dans un element ceramique

Country Status (3)

Country Link
EP (1) EP1794502A1 (fr)
DE (1) DE102004045815A1 (fr)
WO (1) WO2006032558A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114315403A (zh) * 2021-12-22 2022-04-12 北京科技大学 一种C/C及C/SiC复合材料与金属的植丝增强钎焊连接方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007001648A1 (de) * 2007-01-11 2008-07-17 Robert Bosch Gmbh Glühstiftkerze

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0650020A2 (fr) * 1993-10-20 1995-04-26 Isuzu Ceramics Research Institute Co., Ltd. Elément chauffant céramique et son procédé de fabrication
EP0771773A2 (fr) * 1995-10-12 1997-05-07 Isuzu Ceramics Research Institute Co., Ltd. Corps céramique de type de gaine et procédé de sa fabrication
US6018142A (en) * 1997-03-03 2000-01-25 Korea Research Institiute Of Chemical Technology Glow plug ceramic heater
DE10055082A1 (de) * 2000-11-07 2002-05-16 Bosch Gmbh Robert Keramischer Verbundwerkstoff
JP2002246153A (ja) * 2001-02-21 2002-08-30 Ngk Spark Plug Co Ltd セラミックヒータ及びこれを備えるグロープラグ
WO2004104479A1 (fr) * 2003-05-16 2004-12-02 Robert Bosch Gmbh Bougie crayon de prechauffage a element de contact a enrobage special

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0650020A2 (fr) * 1993-10-20 1995-04-26 Isuzu Ceramics Research Institute Co., Ltd. Elément chauffant céramique et son procédé de fabrication
EP0771773A2 (fr) * 1995-10-12 1997-05-07 Isuzu Ceramics Research Institute Co., Ltd. Corps céramique de type de gaine et procédé de sa fabrication
US6018142A (en) * 1997-03-03 2000-01-25 Korea Research Institiute Of Chemical Technology Glow plug ceramic heater
DE10055082A1 (de) * 2000-11-07 2002-05-16 Bosch Gmbh Robert Keramischer Verbundwerkstoff
JP2002246153A (ja) * 2001-02-21 2002-08-30 Ngk Spark Plug Co Ltd セラミックヒータ及びこれを備えるグロープラグ
WO2004104479A1 (fr) * 2003-05-16 2004-12-02 Robert Bosch Gmbh Bougie crayon de prechauffage a element de contact a enrobage special

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 12 12 December 2002 (2002-12-12) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114315403A (zh) * 2021-12-22 2022-04-12 北京科技大学 一种C/C及C/SiC复合材料与金属的植丝增强钎焊连接方法
CN114315403B (zh) * 2021-12-22 2023-02-24 北京科技大学 一种C/C及C/SiC复合材料与金属的植丝增强钎焊连接方法

Also Published As

Publication number Publication date
DE102004045815A1 (de) 2006-03-23
EP1794502A1 (fr) 2007-06-13

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