EP0946776A1 - Procede pour recuire des pieces de metaux lourds non ferreux sans formation d'excroissances - Google Patents

Procede pour recuire des pieces de metaux lourds non ferreux sans formation d'excroissances

Info

Publication number
EP0946776A1
EP0946776A1 EP97951214A EP97951214A EP0946776A1 EP 0946776 A1 EP0946776 A1 EP 0946776A1 EP 97951214 A EP97951214 A EP 97951214A EP 97951214 A EP97951214 A EP 97951214A EP 0946776 A1 EP0946776 A1 EP 0946776A1
Authority
EP
European Patent Office
Prior art keywords
annealing
protective gas
gas atmosphere
oxide layer
inert
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.)
Granted
Application number
EP97951214A
Other languages
German (de)
English (en)
Other versions
EP0946776B1 (fr
Inventor
Peter Zylla
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim 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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Publication of EP0946776A1 publication Critical patent/EP0946776A1/fr
Application granted granted Critical
Publication of EP0946776B1 publication Critical patent/EP0946776B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon

Definitions

  • the invention relates to a method for glue-free annealing of non-ferrous metal parts, i.e. to avoid so-called glue during the annealing process, especially in a hood furnace.
  • Non-ferrous metal parts such as bronze wire or ribbon
  • a homogenizing annealing after casting and a forming process. Thereafter, further forming, such as rolling or drawing, and recrystallization annealing are carried out alternately.
  • the annealing temperatures are between 300 ° C and 700 ° C.
  • the annealing is carried out in continuous furnaces, which is a relatively large effort given the mostly small cross-sections of the parts.
  • annealing bundles e.g. in hood furnaces is created at the contact points of the parts, e.g. local diffusion welding, so-called glue, between individual turns of wound wire or strip, due to diffusion processes. These cause during further processing, i.e. during unwinding, material tears on the surface. This results in surface defects. If this does not cause a committee, extensive rework is required. Adhesives on annealed non-ferrous metal parts are of course highly undesirable.
  • Nonferrous metals are understood to mean alloys with the main components copper, tin, aluminum and lead, with numerous other components also being considered, such as magnesium, nickel and others.
  • the invention has for its object to provide a method with which non-ferrous metal parts, in particular non-ferrous metal coils, can be annealed without glue in hood furnaces.
  • Fig. 1 shows the copper-tin state diagram
  • Fig. 2 shows the time course of the temperature and the composition of a protective gas atmosphere for adhesive-free bronze wire treatment.
  • Fig. 1 shows the state diagram of copper-tin alloys.
  • the ⁇ crystal at 520 ° C eutectoid decays into ⁇ + ⁇
  • the ⁇ phase changes at a temperature of about 350 ° C in turn eutectoid in ⁇ + ⁇ um, with the compound Cu 3 ⁇ Sn 8 the ⁇ phase and Cu 3 Sn the ⁇ phase.
  • This transformation is extremely slow, so that even if they have been slowly cooled, technical alloys have ( ⁇ + ⁇ ) eutectoid in the final state.
  • the tin concentration differences within a crystal can be up to 10%. Homogenization annealing aims to compensate for these differences as much as possible. Dissolution of the ⁇ component is achieved during annealing in the range from 650 ° C to 700 ° C, which results in a considerable increase in elongation. The tensile strength increases with increasing elongation.
  • Copper-tin alloys are usually cast in an air atmosphere and are usually cold formed. This means that the surface is strongly oxidized.
  • FIG. 2 An example of such a treatment is explained in FIG. 2.
  • a gas mixture with 15 vol .-% CO 2 (rest N 2 ) ensured the preservation of the existing oxide layers during the heating and holding time and, depending on the alloying elements, for example during intermediate annealing of wires that had already been cold-formed, performed an additional one even at temperatures of 400 ° C Oxidation caused by the CO 2 portion.
  • the protective coating of the surface with a thin oxide layer prevented the exudation from the annealing material and the batches were annealed without glue.
  • better conditions were created for the homogenization process.
  • the N 2 / CO 2 protective gas atmosphere was exchanged for a pure hydrogen atmosphere at the end of the holding time. This was for the end of the Holding time and greatly reducing conditions for the cooling time were created and the oxide layers protecting against sticking were broken down. The batches were annealed bright and glue-free. The change in the relevant parameters over time is shown again in the following overview:
  • the heat treatment of wire cast in air which already has a pronounced oxide layer, would also be possible in the holding phase with an inert protective gas atmosphere, e.g. with pure nitrogen.
  • the oxide layer could then be reduced with hydrogen in the cooling phase in order to achieve a bright annealing result.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

L'invention concerne un procédé permettant d'éviter la formation d'excroissances lors du recuit d'alliages de métaux lourds non ferreux. Ce procédé comprend différentes phases: chauffage, maintien, refroidissement au cours duquel le produit de recuit est exposé à une atmosphère de gaz de protection inerte ou à action oxydante pendant la transformation structurale, de manière que pendant cette période, il se forme une fine couche d'oxyde à la surface du produit de recuit et/ou qu'il soit maintenu une couche d'oxyde déjà présente qui empêche les pièces de métaux lourds non ferreux de coller les unes aux autres.
EP97951214A 1996-12-18 1997-11-17 Procede pour recuire des pieces de metaux lourds non ferreux sans formation d'excroissances Expired - Lifetime EP0946776B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19652607 1996-12-18
DE19652607A DE19652607A1 (de) 1996-12-18 1996-12-18 Verfahren zum kleberfreien Glühen von Buntmetallteilen
PCT/EP1997/006394 WO1998027243A1 (fr) 1996-12-18 1997-11-17 Procede pour recuire des pieces de metaux lourds non ferreux sans formation d'excroissances

Publications (2)

Publication Number Publication Date
EP0946776A1 true EP0946776A1 (fr) 1999-10-06
EP0946776B1 EP0946776B1 (fr) 2001-12-19

Family

ID=7815081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97951214A Expired - Lifetime EP0946776B1 (fr) 1996-12-18 1997-11-17 Procede pour recuire des pieces de metaux lourds non ferreux sans formation d'excroissances

Country Status (9)

Country Link
US (1) US6159307A (fr)
EP (1) EP0946776B1 (fr)
JP (1) JP2001506317A (fr)
AT (1) ATE211184T1 (fr)
DE (2) DE19652607A1 (fr)
ES (1) ES2170425T3 (fr)
TW (1) TW486521B (fr)
UA (1) UA47512C2 (fr)
WO (1) WO1998027243A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6457992B2 (en) * 1999-02-08 2002-10-01 3Com Corporation Visual feedback system for electronic device
JP2010248593A (ja) * 2009-04-17 2010-11-04 Hitachi Cable Ltd 電気・電子部品用銅合金材およびその製造方法
NO345511B1 (en) * 2019-01-17 2021-03-22 Norsk Hydro As Method for and equipment for suppressing discoloration of Al-Mg products

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US896811A (en) * 1908-02-06 1908-08-25 Edison Storage Battery Co Metallic film for use with storage-battery electrodes and process of preparing the same.
US1815505A (en) * 1929-11-15 1931-07-21 Oscar J Wilbor Bright annealing of metals
DE669520C (de) * 1937-11-06 1938-12-28 Felten & Guilleaume Carlswerk Verfahren zum Verhueten des Zusammenbackens von Draehten, Blechen oder Baendern, insbesondere aus Schwermetallen, beim Blankgluehen
US2379736A (en) * 1939-11-06 1945-07-03 Nat Agrol Company Inc Method of making a catalyst and resulting product
US2320962A (en) * 1941-09-26 1943-06-01 Westinghouse Electric & Mfg Co Treatment of copper-oxide rectifiers with nitrogen
US2810667A (en) * 1952-10-14 1957-10-22 Siemens Ag Process for heat-treating metals in a space containing a non-oxidizing protective gas atmosphere
JPS5510903A (en) * 1978-07-07 1980-01-25 Hitachi Ltd Juicer
JPS6053106B2 (ja) * 1979-02-01 1985-11-22 三菱マテリアル株式会社 無酸素銅線素材
JPS57185963A (en) * 1981-05-07 1982-11-16 Hitachi Cable Ltd Annealing method for copper or copper alloy material
DE3234863C2 (de) * 1982-09-21 1986-04-10 Messer Griesheim Gmbh, 6000 Frankfurt Verfahren und Vorrichtung zum Blankglühen von metallischen Werkstücken mit Stickstoff als Schutzgas
US4443274A (en) * 1982-12-03 1984-04-17 Olin Corporation Process for forming a protective film on Cu-Sn alloys
JPS613876A (ja) * 1984-06-19 1986-01-09 Nippon Mining Co Ltd 耐食性に優れた銅合金及び同合金の表面処理方法
DE4207394C1 (fr) * 1992-03-09 1993-02-11 Messer Griesheim Gmbh, 6000 Frankfurt, De

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9827243A1 *

Also Published As

Publication number Publication date
US6159307A (en) 2000-12-12
ES2170425T3 (es) 2002-08-01
JP2001506317A (ja) 2001-05-15
DE19652607A1 (de) 1998-06-25
EP0946776B1 (fr) 2001-12-19
UA47512C2 (uk) 2002-07-15
DE59705922D1 (de) 2002-01-31
TW486521B (en) 2002-05-11
WO1998027243A1 (fr) 1998-06-25
ATE211184T1 (de) 2002-01-15

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