EP0685564B1 - Kupfer-Zink-Manganlegierung zur Herstellung von Gegenständen, die in längeren direkten Kontakt mit der menschlichen Haut kommen - Google Patents

Kupfer-Zink-Manganlegierung zur Herstellung von Gegenständen, die in längeren direkten Kontakt mit der menschlichen Haut kommen Download PDF

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Publication number
EP0685564B1
EP0685564B1 EP94830269A EP94830269A EP0685564B1 EP 0685564 B1 EP0685564 B1 EP 0685564B1 EP 94830269 A EP94830269 A EP 94830269A EP 94830269 A EP94830269 A EP 94830269A EP 0685564 B1 EP0685564 B1 EP 0685564B1
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EP
European Patent Office
Prior art keywords
alloy
weight
copper
tin
zinc
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.)
Expired - Lifetime
Application number
EP94830269A
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English (en)
French (fr)
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EP0685564A1 (de
Inventor
Niccolò Ammannati
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Europa Metalli SpA
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Europa Metalli SpA
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Publication date
Application filed by Europa Metalli SpA filed Critical Europa Metalli SpA
Priority to EP94830269A priority Critical patent/EP0685564B1/de
Priority to DE69422610T priority patent/DE69422610T2/de
Priority to AT94830269T priority patent/ATE188747T1/de
Publication of EP0685564A1 publication Critical patent/EP0685564A1/de
Application granted granted Critical
Publication of EP0685564B1 publication Critical patent/EP0685564B1/de
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/05—Alloys based on copper with manganese as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/04—Alloys based on copper with zinc as the next major constituent

Definitions

  • the present invention relates to a copper-based metal alloy suitable for replacing copper-zinc-nickel alloys (so called nickel silvers) with the same aesthetic characteristics (particularly as regards their silvery-white colour) and workability for uses in which the alloy is intended to come into direct and prolonged contact with the human skin.
  • DAVIS alloys Ternary Cu-Zn-Mn alloys
  • the object of the present invention is to provide a metal alloy which does not include nickel and which, more generally, does not contain other elements harmful to human health (for example lead, antimony, arsenic, etc) which are capable of replacing nickel silvers in all applications in which the alloy is intended to come into direct and prolonged contact with the human skin and which will give aesthetic results and work ability not inferior to those obtainable with nickel silvers.
  • other elements harmful to human health for example lead, antimony, arsenic, etc
  • the invention therefore provides a copper-based "white” metal alloy according to claim 1 for the production of articles intended to come into direct and prolonged contact with the human skin.
  • the alloy according to the invention has the following composition in percentages by weight: from 50% to 70% copper; from 8% to 25% manganese; from 0.05% to 1% tin; the rest being zinc but not in any case more than 39%.
  • the alloy of the invention may be hot-extruded over a very wide temperature range, of about 60°, that is about twice the normal range of workability for conventional DAVIS alloys (that is without tin) of equivalent composition.
  • the alloy of the invention may also be cold-worked not only better than known DAVIS alloys but even better than nickel silvers, whereby the alloy of the invention may be used to produce semi-finished products (for example wires for spectacles and jewellery) or finished articles (for example cutlery) with the use of the same plants and processes as those used at present for nickel silvers, with the resulting real possibility of replacing of these latter alloys at low cost.
  • semi-finished products for example wires for spectacles and jewellery
  • finished articles for example cutlery
  • the semi-finished product must be annealed to eliminate work-hardening.
  • This annealing may be carried out in the air or in a controlled atmosphere or in a salt bath.
  • the alloy of the invention may further preferably include from 0.01% by weight to 0.1% by weight of magnesium which acts as a deoxidant for the manganese and may optionally include from 0.2% to 0.4% by weight of aluminium (Al), even though the addition of aluminium may give rise to undesirable colour problems because of the formation of alumina on the surface.
  • the alloy of the invention to include no more than 0.4% by weight of tin, since higher percentages may give rise to the formation of low-melting phases at the edges of the alpha-phase crystals with the consequent need to reheat the alloy to high temperatures (about 800°C) to enable the low-melting phases to be reabsorbed into the homogeneous matrix.
  • the metal alloy of the invention thus has the following nominal composition by weight: 60% copper, 20% manganese, 0.2% tin, 0.05% magnesium, 19.75% zinc.
  • An alloy (1) was prepared with the use of an induction furnace having a capacity of 4000kg and operated under a cover of chlorine at a temperature of 1140°C, the alloy having the following percentage composition by weight: 60% Cu, 20% Mn, 0.2% Sn, 19.75% Zn, 0.05% Mg.
  • This alloy was obtained by fusing 532 kg of ETP copper in the oven and then adding 2.668 kg of a Cu-Mn pre-alloy containing 30% by weight of Mn and finally 8kg of tin bars, 790 kg of zinc and 2kg of magnesium; the alloy thus obtained was then scorified and poured in successive stages into a 1500 kg furnace kept at 1150°C,from which it was cast semi-continuously, in a manner known, by copper ingot molds,which are cooled by water circulation and provided with secondary cooling at the outlet; round-section, 7-metre long bars having a diameter of 220 mm and 6 - 7 metre long plates of rectangular section, 1000 mm x 252 mm,were obtained; the casting speed used was between 180 and 200 mm/minutes.
  • a ternary Cu-Zn-Mn alloy (2) with a composition by weight similar to that of the alloy (1) but without Sn (60% Cu, 20% Zn, 20% Mn) and an 18-18 nickel silver (18% Ni, 18% Zn, the rest being Cu - alloy (3)).
  • Samples were taken from all three alloys prepared and compared visually, a high comparability being found in colour both in the crude and in the polished samples; in particular, after metallographic etching, the sample of the Cu-Mn-Zn-Sn alloy (1) had the appearance shown in the photomicrograph of Figure 1, being substantially homogeneous, with alpha-phase crystalline grains having an average diameter of 70-80 ⁇ m and a silvery white colour, entirely identical to that of the 18-18 nickel silver alloy (3).
  • the round bars were hot extruded,after heating to a temperature of about 800°C for two hours,to reduce their section from a diameter of 220mm to 21mm; the bars of alloy (1) could be extruded to give exactly the same good results over the entire temperature range between 740 and 800°C; the bars of alloy (2), without Sn, however could be extruded without the appearance of defects only in a much narrower temperature range between 780°C and 750°C.
  • the round bars were then rolled to change their section from a 21mm-diameter round section to a 12x12mm square section and they were then annealed at 650°C for 3 hours; a second rolling step was then carried out to reduce the section to 8x8 mm followed by by annealing as above and the square, 8x8 mm bars were then drawn into wires 5.4 mm in diameter; subsequently the wire was scraped with a tool to give a final diameter of 5.1 mm after which it was drawn in a plurality of steps, with intermediate annealing to a diameter of 2.08 mm,annealed as above and drawn to a final diameter of 1.8 mm.
  • the plates were hot-rolled at a temperature within the said range (740-800°C) to obtain a reduction in thickness from 252 to 12 mm then milled to a thickness of 11.2 mm and finally cold-rolled in a plurality of steps, with intermediate annealing as indicated above, up to 3 mm (annealed material) and up to 1 mm (the material being left work-hardened).
  • the alloy (1) was again seen to behave noticeably better; the results of the tests are summarised in Table 1 where the extensibility values (A%) relate to the annealed materials. Alloy A% Max. reduction by cold working Nickel silver(3) 35-40 45 (drawn) 80 (rolled) Cu-Zn-Mn (2) 30 30-35 (drawn) Cu-Zn-Mn-Sn (1) 40 55-65 (drawn) 90 (rolled)

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Conductive Materials (AREA)
  • Contacts (AREA)
  • Adornments (AREA)
  • Cosmetics (AREA)

Claims (3)

  1. Kupferbasierte "weiße" Metallegierung zur Herstellung von Artikeln, die in direkten und längeren Kontakt mit einer menschlichen Haut gelangen sollen, welche Cu, Zn und Mn in solchen Mengen enthält, so daß sie eine metallographische Alpha-Messing-Struktur besitzt, und ferner Zinn enthält,
    welches hauptsächlich als Mischkristall oder Einlagerungsmischkristall vorhanden ist, um dadurch eine im wesentlichen homogene quaternäre Legierung zu erhalten, wobei die Legierung folgende Zusammensetzung in Gewichtsprozent aufweist:
    von 50% bis 70% Kupfer; von 8% bis 25% Mangan; von 0,05% bis 1% Zinn, optional von 0,01 Gewichtsprozent bis 0,1 Gewichtsprozent Magnesium und/oder von 0,2 Gewichtsprozent bis 0,4 Gewichtsprozent Aluminium, wobei der Rest Zink ist, jedoch in keinem Fall mehr als 39%.
  2. Metallegierung nach Anspruch 1,
       dadurch gekennzeichnet, daß sie nicht mehr als 0,4 Gewichtsprozent Zinn enthält.
  3. Metallegierung nach Anspruch 1 oder 2,
       dadurch gekennzeichnet, daß sie die folgende nominelle Zusammensetzung in Gewichtsprozent aufweist: 60% Kupfer, 20% Mangan, 0,2% Zinn, 0,05% Magnesium, 19,75% Zink.
EP94830269A 1994-05-31 1994-05-31 Kupfer-Zink-Manganlegierung zur Herstellung von Gegenständen, die in längeren direkten Kontakt mit der menschlichen Haut kommen Expired - Lifetime EP0685564B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP94830269A EP0685564B1 (de) 1994-05-31 1994-05-31 Kupfer-Zink-Manganlegierung zur Herstellung von Gegenständen, die in längeren direkten Kontakt mit der menschlichen Haut kommen
DE69422610T DE69422610T2 (de) 1994-05-31 1994-05-31 Kupfer-Zink-Manganlegierung zur Herstellung von Gegenständen, die in längeren direkten Kontakt mit der menschlichen Haut kommen
AT94830269T ATE188747T1 (de) 1994-05-31 1994-05-31 Kupfer-zink-manganlegierung zur herstellung von gegenständen, die in längeren direkten kontakt mit der menschlichen haut kommen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94830269A EP0685564B1 (de) 1994-05-31 1994-05-31 Kupfer-Zink-Manganlegierung zur Herstellung von Gegenständen, die in längeren direkten Kontakt mit der menschlichen Haut kommen

Publications (2)

Publication Number Publication Date
EP0685564A1 EP0685564A1 (de) 1995-12-06
EP0685564B1 true EP0685564B1 (de) 2000-01-12

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Application Number Title Priority Date Filing Date
EP94830269A Expired - Lifetime EP0685564B1 (de) 1994-05-31 1994-05-31 Kupfer-Zink-Manganlegierung zur Herstellung von Gegenständen, die in längeren direkten Kontakt mit der menschlichen Haut kommen

Country Status (3)

Country Link
EP (1) EP0685564B1 (de)
AT (1) ATE188747T1 (de)
DE (1) DE69422610T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2573198A1 (de) 2011-09-22 2013-03-27 KME Germany GmbH & Co. KG Kupferwerkstoff für die Herstellung eines silberfarbigen Produktes mit einer antimikrobiellen Oberfläche

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3713233B2 (ja) * 2001-12-14 2005-11-09 Ｙｋｋ株式会社 連続鋳造性に優れたスライドファスナー用銅合金
CA2736881A1 (en) 2008-09-10 2010-03-18 Pmx Industries Inc. White-colored copper alloy with reduced nickel content
EP2981500B1 (de) * 2013-04-05 2020-05-27 HERM. SPRENGER GmbH & Co. KG Kupferlegierung zur herstellung von pferdegebissen oder pferdegebissteilen
JP7365304B2 (ja) * 2020-04-23 2023-10-19 日本碍子株式会社 抗菌性部材及び抗菌性物品

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2195435A (en) * 1938-08-19 1940-04-02 American Brass Co Copper alloy
GB1186249A (en) * 1967-12-14 1970-04-02 Vni I K I Avtogennogo Mash Improvements in or relating to Solder.
US5013450A (en) * 1989-05-23 1991-05-07 Luis Gomez Method and solid material body for the purification of fluids such as water, aqueous fluids and liquid fuels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2573198A1 (de) 2011-09-22 2013-03-27 KME Germany GmbH & Co. KG Kupferwerkstoff für die Herstellung eines silberfarbigen Produktes mit einer antimikrobiellen Oberfläche
DE102012014851A1 (de) 2011-09-22 2013-03-28 Kme Germany Gmbh & Co. Kg Kupferwerkstoff für die Herstellung eines silberfarbigen Produktes mit einer antimikrobiellen Oberfläche

Also Published As

Publication number Publication date
DE69422610T2 (de) 2001-02-01
DE69422610D1 (de) 2000-02-17
ATE188747T1 (de) 2000-01-15
EP0685564A1 (de) 1995-12-06

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