EP1333953A1 - Procede de brasage d'un composite metal-ceramique - Google Patents

Procede de brasage d'un composite metal-ceramique

Info

Publication number
EP1333953A1
EP1333953A1 EP01988638A EP01988638A EP1333953A1 EP 1333953 A1 EP1333953 A1 EP 1333953A1 EP 01988638 A EP01988638 A EP 01988638A EP 01988638 A EP01988638 A EP 01988638A EP 1333953 A1 EP1333953 A1 EP 1333953A1
Authority
EP
European Patent Office
Prior art keywords
ceramic
metal
connection
temperature
silver
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.)
Withdrawn
Application number
EP01988638A
Other languages
German (de)
English (en)
Inventor
Rüdiger Nass
Michael Kuntz
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.)
Nanogate Technologies GmbH
Original Assignee
Nanogate Technologies 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
Priority claimed from DE10055910A external-priority patent/DE10055910A1/de
Application filed by Nanogate Technologies GmbH filed Critical Nanogate Technologies GmbH
Publication of EP1333953A1 publication Critical patent/EP1333953A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered

Definitions

  • the present invention relates to the preamble of the independent claim.
  • the present invention is concerned with the welding of ceramics.
  • Soldering or connecting ceramic and metal is problematic if a very durable connection is to be achieved in a simple manner. First of all, it is difficult to get a connection at all; however, this must also be very stable, which, given the often very different material properties of metal and ceramic, is not guaranteed, at least not readily. Particular problems arise with cyclic and / or high heating of the workpiece in the connection area. Due to the greatly different thermal expansion coefficients of the connection partners, destruction by shell breakage can occur even with one-time high and / or rapid heating or rapid cooling.
  • This document proposes a method for joining two ceramics or a ceramic to a metal, in which a surface of a ceramic is coated with a reactive component. The coated surface is soldered to the surface of another ceramic coated in the same way or to the surface of a metal.
  • the wetting with the reactive component takes place with active solders separately from Soldering process and in particular complete wetting should be ensured in the case of capillary soldering.
  • a drawback that makes the DE 197 34 211 provides for soldered joints in a high vacuum oven at pressures of 1CT 4 - perform 10 "5 mbar.
  • the present invention consists in providing something new for commercial use.
  • the invention thus proposes, according to a first aspect of the invention, that an active solder component is applied to the ceramic in order to produce a ceramic-metal connection, the metal to be connected is brought onto the surface provided with the active solder component and then an electrical current flow caused by the interface until a desired connection is achieved.
  • the method can also be used without difficulty for the connection of ceramic and metal, which have different coefficients of expansion, by using solder in an amount sufficient to reduce and / or absorb mechanical stresses between ceramic and metal.
  • solder in an amount sufficient to reduce and / or absorb mechanical stresses between ceramic and metal.
  • the high and low temperatures are defined on the one hand by the maximum or minimum operating temperatures, possibly taking into account a safety reserve, or, if only a narrow temperature band is covered during operation, by cooling from the soldering temperature to the ambient temperature. If the latter temperature difference is limiting, a gradual cooling of the transition point by gradually lowering the current flow, in particular in steps or in a ramped manner, can be beneficial.
  • a typical application area which is particularly preferred for the invention is the manufacture of Position of a ceramic-metal connection between silicon carbide glow igniters and the like and the metal connections of a connecting line supplying this power. It goes without saying that a particularly intensive thermal cycling will occur especially with glow igniters.
  • Another preferred variant of the method relates to titanium boride, which can also be used according to the invention
  • aluminum is used as the metal with which the ceramic, in particular the carbide, especially silicon carbide, can be bonded. Due to its high ductility, aluminum results in a particularly efficient reduction of mechanical stresses, so that shell breaks and the like are particularly effectively avoided. A connection between ceramic and metal with aluminum as metal can also be established due to the good absorption of mechanical stresses with fast heating up or cooling down times, which in turn accelerates the establishment of the connection. Added to this is the high oxygen affinity of aluminum, which helps to reduce existing oxide layers in the contact area and thus results in a particularly good connection.
  • Another metal that can preferably be used is silver or a silver-containing alloy, in particular with a silver content of at least 30% silver, a silver-containing alloy, hereinafter silver, which also has a high ductility and to which a higher temperature resistance than Has aluminum. It is preferred to use silver in conjunction with a component such as aluminum or also titanium, which has a high affinity for oxygen and / or is suitable as an active component for other reasons.
  • the active component is applied to the ceramic, roughly rubbed before the ceramic-silver connection is created.
  • Other active, oxygen-affine metals and / or alloys, for example hafnium, can be used, but are typically too expensive.
  • the current and / or the power is changed during the welding process. It is particularly preferred if the current is voltage-limited when heated or in the heated state. This safely prevents overheating, which would lead to material scaling, material that is not covered by the melt oxidized, etc.
  • a clamping of the parts to be connected to one another, in particular clamping with constant force, can be provided. This ensures a proper connection.
  • the electrodes are preferably used for clamping.
  • a silicon carbide body for a SiC glow starter is rubbed several times over an aluminum sheet as an active component at a contact end that is remote from the glow tip and is to be contacted.
  • the rubbing can be done manually, but in the present case is supported mechanically by arranging the sheet on a rotating disc against which the contact end to be rubbed is pressed for a sufficient time. Then a silver stripe is placed on the contact end and silver stripe and silicon carbide are clamped between two electrodes with a defined, constant force.
  • a voltage of approximately 50 volts is now applied across the electrodes.
  • a current flows, whereby the vast majority of the voltage drops at the interface between metal and carbide and in the ceramic body.
  • the voltage can be between 10 and 50 volts.
  • the initial voltage depends on the electrical cold conductivity of the ceramics. Those specified conductivities are preferred which require initial voltages of 10 to 150 V for a given geometry.
  • the SiC plate and the silver stripe heat up considerably, the resistance decreases and the current increases. An increase from approximately 3 amperes to approximately 15 amperes was observed, where the limitation was made.
  • the voltage is reduced to about 15 volts at the same time. This prevents a critical temperature from being exceeded and heats the transition point to a temperature of at least 960 °, corresponding to the melting temperature of silver. After this temperature has been reached, the electrodes clamped against one another approach each other, and after reaching a predetermined approach position, the current is switched off. It should be noted that exceeding the critical temperature can also be prevented if the effective performance as such is limited. It should also be pointed out that the flowing currents will depend in particular on the geometry of the arrangement. As a result, welding between the SiC element and silver stripes is obtained.
  • a nickel strand is crimped with an aluminum shoe. Ceramic and aluminum shoes are now placed between electrodes and a voltage of approximately 50 volts is applied. The Sic plate heats up at the transition point within a few seconds, and the specific resistance of the SiC, which is about 0.3 to 2 ohm ⁇ cm at room temperature, drops to 1/5 to 1/10 of the initial value while the ceramic is heated. The maximum current is again limited to 15 amps.
  • connection obtained in this way proves to be highly stable even with repeated rapid cycling, without damage in the form of shell breaks and / or tension cracks being observed.
  • a silver cable lug is welded directly with titanium-rubbed SiC, the welding voltage again being selected to be high and being reduced or limited in the course of the welding in order to avoid welding point overheating.
  • the compound obtained is even more stable than that to aluminum, in particular due to the higher melting temperature of silver. This makes the connection particularly suitable for use in glow contact.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Products (AREA)

Abstract

L'invention concerne un procédé de production d'un composite métal-céramique. Ce procédé consiste à appliquer un composant de métal d'apport de brasage actif sur la céramique et à appliquer sur la surface le métal à lier. Un flux de courant électrique est généré dans la zone de transition jusqu'à obtention de la liaison.
EP01988638A 2000-10-24 2001-10-24 Procede de brasage d'un composite metal-ceramique Withdrawn EP1333953A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10052562 2000-10-24
DE10052562 2000-10-24
DE10055910 2000-11-10
DE10055910A DE10055910A1 (de) 2000-10-24 2000-11-10 Verbindungsverfahren
PCT/EP2001/012306 WO2002034447A1 (fr) 2000-10-24 2001-10-24 Procede de brasage d"un composite metal-ceramique

Publications (1)

Publication Number Publication Date
EP1333953A1 true EP1333953A1 (fr) 2003-08-13

Family

ID=26007469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01988638A Withdrawn EP1333953A1 (fr) 2000-10-24 2001-10-24 Procede de brasage d'un composite metal-ceramique

Country Status (4)

Country Link
EP (1) EP1333953A1 (fr)
AU (1) AU2002218256A1 (fr)
DE (1) DE10194638D2 (fr)
WO (1) WO2002034447A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107234309A (zh) * 2017-04-24 2017-10-10 广东威特真空电子制造有限公司 用于钎焊的金属化陶瓷结构及其制造方法及磁控管

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4105596A1 (de) * 1991-02-22 1992-08-27 Degussa Verfahren zur herstellung von hochtemperaturbestaendigen loetverbindungen
SE505826C2 (sv) * 1992-03-02 1997-10-13 Kanthal Ab Förbindning mellan ett metalliskt material och ett huvudsakligen av molybdendisilicid bestående keramiskt meterial, samt sätt att åstadkomma en sådan förbindning
JPH06107473A (ja) * 1992-09-24 1994-04-19 Toyo Kogyo Kk セラミック体の接合方法
US5961853A (en) * 1993-11-26 1999-10-05 Ford Global Technologies, Inc. Weld/brazing of light metal alloys
JP4077888B2 (ja) * 1995-07-21 2008-04-23 株式会社東芝 セラミックス回路基板
DE19734211C2 (de) * 1997-08-07 2001-08-30 Forschungszentrum Juelich Gmbh Verfahren zum Verlöten zweier Keramiken oder einer Keramik mit einem Metall

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0234447A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107234309A (zh) * 2017-04-24 2017-10-10 广东威特真空电子制造有限公司 用于钎焊的金属化陶瓷结构及其制造方法及磁控管

Also Published As

Publication number Publication date
AU2002218256A1 (en) 2002-05-06
WO2002034447A1 (fr) 2002-05-02
DE10194638D2 (de) 2003-11-20

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