EP0846188A2 - Procede de fabrication de cuivre a durcissement par phase dispersee, par alliage mecanique - Google Patents

Procede de fabrication de cuivre a durcissement par phase dispersee, par alliage mecanique

Info

Publication number
EP0846188A2
EP0846188A2 EP96934391A EP96934391A EP0846188A2 EP 0846188 A2 EP0846188 A2 EP 0846188A2 EP 96934391 A EP96934391 A EP 96934391A EP 96934391 A EP96934391 A EP 96934391A EP 0846188 A2 EP0846188 A2 EP 0846188A2
Authority
EP
European Patent Office
Prior art keywords
copper
powder
balls
dispersion
mechanical alloying
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
EP96934391A
Other languages
German (de)
English (en)
Inventor
Claudia Peuker
Franz Hauner
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0846188A2 publication Critical patent/EP0846188A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1084—Alloys containing non-metals by mechanical alloying (blending, milling)

Definitions

  • the invention relates to a method for producing dispersion-hardened copper by mechanical alloying, in which a powdery copper material and a thermodynamically stable ceramic powder are ground in a grinder with balls in an air atmosphere.
  • German Offenlegungs ⁇ DT 27 11 071 AI A method of this type is described in German Offenlegungs ⁇ DT 27 11 071 AI.
  • a powdery copper material in the form of a copper powder or a copper alloy powder in an air atmosphere e.g. ground in a vibrating ball mill or a stirred ball mill as a grinder.
  • the grinder contains a steel grinding vessel in which steel balls are moved in the powdery copper material, whereby a grinding process takes place.
  • some iron gets into the powder from the wall of the grinding vessel; however, a much higher proportion of iron gets into the powdered copper material from the balls themselves. This leads to the formation of an iron-copper mixed crystal, which has a significantly reduced conductivity compared to pure copper. Therefore, in the known method, the millbase is treated with a gas mixture prior to extrusion, the reducing power of which is set so that the copper is reduced and the iron present is oxidized to iron oxide without copper oxide being formed.
  • the invention is based on the object of proposing a method for producing dispersion-hardened copper by mechanical alloying, in which only a vanishingly small proportion of iron-copper mixed crystals is formed during the grinding of the copper material / ceramic powder mixture.
  • balls made of copper are used in the grinder according to the invention, which have been subjected to a pretreatment by grinding in a pulverulent ceramic substance.
  • a major advantage of the method according to the invention is that instead of steel balls, copper balls are used, because as a result no iron can get from the balls into the material to be ground.
  • a prerequisite for the use of copper balls is that the balls have undergone a pretreatment, which results in dispersion hardening in the region of the balls near the surface, which prevents plating during grinding with the powdered copper material.
  • thermodynamically stable ceramic powder can advantageously be used as the powdered ceramic substance, so that no further ceramic substance is required for the pretreatment.
  • both a copper powder or a copper alloy powder can advantageously be used as the powdery copper material; this is known per se.
  • a grinder 1 has a grinding vessel 2, which is pot-shaped and made of steel.
  • a drive shaft 4 for an agitator 5, which has three agitator blades in the exemplary embodiment shown, is guided through a lid 3 of the grinding vessel 2, which is upper in the figure.
  • the grinding vessel 2 is filled, for example, with a mixture 6 of copper powder as powdered copper material and from a thermodynamically stable ceramic powder, such as Y2 ⁇ 3 ' ⁇ i ⁇ 2 and Al2 ⁇ 3 / ; there are also 2 balls 7 made of copper in the grinding vessel, which are moved by the agitator 5 in the grinding vessel 2 and thereby grind the mixture 6.
  • the balls 7 are made of copper - before they are used to grind the
  • Mixture 6 of copper powder and ceramic powder are used - subjected to a pretreatment.
  • This pretreatment consists in filling the initially empty grinding vessel 2 with a powdered ceramic substance in addition to the copper balls 7 and then carrying out a grinding process.
  • the regions of the balls 7 made of copper near the surface experience dispersion hardening. This means that later when the mixture 6 made of powdered copper material and ceramic powder is ground, plating with the mixture cannot occur.
  • the powdered ceramic substance is removed from the grinding vessel and the mixture 6 is poured in; the mixture 6 with the pretreated balls then begins to be ground. These do not have to be pretreated before each grinding process.
  • the mixture 6 is ground in an air atmosphere, copper oxide being formed. This prevents cold welding and ensures a satisfactory grinding result.
  • a copper powder with a volume percentage of ceramic powder Al2O3 is used with the method according to the invention and grinding is carried out for five hours in an air atmosphere, then a dispersion-hardened product is obtained Copper with an electrical conductivity of 56 Sm / mm 2 and an iron content less than 100 ppm by mass.
  • a dispersion-hardened copper of only 37 Sm / mm 2 with an iron content of 1100 ppm by mass can be obtained.
  • a tensile strength of 300 N / mm 2 was measured in both cases.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Crushing And Grinding (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

L'invention concerne un procédé de fabrication de cuivre à durcissement par phase dispersée, par alliage mécanique. Selon ce procédé, du cuivre sous forme pulvérulente et une poudre de céramique thermodynamiquement stable sont moulues dans un broyeur doté de boules dans une atmosphère constituée d'air. Pour obtenir avec un tel procédé un cuivre à durcissement par phase dispersée, présentant une conductivité comparativement élevée mais de fabrication relativement bon marché, on place dans le broyeur (1) des boules (7) de cuivre, lesquelles sont soumises à un prétraitement par broyage dans une substance céramique pulvérulente.
EP96934391A 1995-08-22 1996-08-21 Procede de fabrication de cuivre a durcissement par phase dispersee, par alliage mecanique Ceased EP0846188A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19532629 1995-08-22
DE1995132629 DE19532629C1 (de) 1995-08-22 1995-08-22 Verfahren zum Herstellen von dispersionsgehärtetem Kupfer durch mechanisches Legieren
PCT/DE1996/001597 WO1997008351A2 (fr) 1995-08-22 1996-08-21 Procede de fabrication de cuivre a durcissement par phase dispersee, par alliage mecanique

Publications (1)

Publication Number Publication Date
EP0846188A2 true EP0846188A2 (fr) 1998-06-10

Family

ID=7771235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96934391A Ceased EP0846188A2 (fr) 1995-08-22 1996-08-21 Procede de fabrication de cuivre a durcissement par phase dispersee, par alliage mecanique

Country Status (3)

Country Link
EP (1) EP0846188A2 (fr)
DE (1) DE19532629C1 (fr)
WO (1) WO1997008351A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19745636C1 (de) * 1997-10-16 1999-05-27 Siemens Ag Kontaktwerkstoff für die Schweißtechnik sowie einen derartigen Kontaktwerkstoff umfassende Schweißelektrode und Stromkontaktdüse
DE102007005536A1 (de) * 2007-02-03 2008-08-07 Volkswagen Ag Verfahren zur Herstellung einer Elektrode, insbesondere einer Elektrodenkappe zum Widerstandspunktschweißen
DE102009015156A1 (de) 2009-03-26 2010-09-30 Volkswagen Ag Verfahren zur Herstellung eines Dispersionswerkstoffes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1494887A (en) * 1975-06-06 1977-12-14 Ford Motor Co Method of making sintered shapes
AT346079B (de) * 1976-03-15 1978-10-25 Vmw Ranshofen Berndorf Ag Dispersionsgehaertete cu-werkstoffe und verfahren zur herstellung derselben

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9708351A3 *

Also Published As

Publication number Publication date
WO1997008351A2 (fr) 1997-03-06
DE19532629C1 (de) 1996-08-14
WO1997008351A3 (fr) 1997-04-10

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