EP1266974B1 - Goldlegierungen und Vorlegierungen zu deren Herstellung - Google Patents

Goldlegierungen und Vorlegierungen zu deren Herstellung Download PDF

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Publication number
EP1266974B1
EP1266974B1 EP01830349A EP01830349A EP1266974B1 EP 1266974 B1 EP1266974 B1 EP 1266974B1 EP 01830349 A EP01830349 A EP 01830349A EP 01830349 A EP01830349 A EP 01830349A EP 1266974 B1 EP1266974 B1 EP 1266974B1
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EP
European Patent Office
Prior art keywords
alloy
gold
alloys
elements
weight
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.)
Revoked
Application number
EP01830349A
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English (en)
French (fr)
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EP1266974A1 (de
Inventor
Massimo Poliero
Andrea Basso
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.)
Legor Srl
LEG OR Srl
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Legor Srl
LEG OR Srl
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8184548&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1266974(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Legor Srl, LEG OR Srl filed Critical Legor Srl
Priority to EP01830349A priority Critical patent/EP1266974B1/de
Priority to AT01830349T priority patent/ATE278045T1/de
Priority to DE60105987T priority patent/DE60105987D1/de
Priority to ES01830349T priority patent/ES2227106T3/es
Priority to US10/156,386 priority patent/US20030012679A1/en
Publication of EP1266974A1 publication Critical patent/EP1266974A1/de
Application granted granted Critical
Publication of EP1266974B1 publication Critical patent/EP1266974B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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    • 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
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/02—Alloys based on gold

Definitions

  • the present invention relates to gold alloys and to master alloys for obtaining them, mainly for the manufacture of precious objects such as jewellery and gold works, coins and medals.
  • One of the fundamental problems is to obtain gold alloys exhibiting good fluidity (i.e. a good ability to fill the die) at the moment of casting.
  • the silicon tends to combine with the oxygen present both in the starting materials and in the surrounding atmosphere.
  • silicon tends to combine with the refining elements commonly used giving rise to the formation of silicides which go to constitute spheroidal conglomerates of inter-metallic compounds with high hardness, originating flaws known as "hard spots”.
  • Such inclusions can appear on the surface of the finished piece after the final work process, entailing either the rework of the piece, or its discarding.
  • the technical task constituting the basis of the present invention is to provide gold alloys and master alloys for obtaining them which overcome the aforementioned drawbacks.
  • the technical task of the present invention is to provide gold alloys and master alloys for obtaining them which exhibit an excellent fluidity in the molten state even without silicon additions.
  • germanium which, in the percentage of employment described in the present invention, has very distinct fluidising properties, superior to those of silicon: as described below, this feature is readily apparent in comparative melting tests between silicon based alloys and germanium based alloys, the latter described in the present invention.
  • the bath of germanium based alloys exhibits an extremely clean, slag-free surface, characteristic that is due to the fact that the germanium oxides which may be present on the surface of the bath are removed by sublimation at temperatures f around 710°C. Relative to silicon based alloys, therefore, the possibility of inclusions of oxide particles in the castings, with the consequent risk of brittleness, is drastically reduced.
  • germanium concentrations varying between 0.05% and 2% by weight have led to an increase in fluidity deemed to be even greater than the one provided by silicon in normal usage concentrations, whilst exhibiting an increase in grain size, following such addition, that is decidedly smaller than that observed in silicon alloys.
  • germanium alloys with low or nil silicon content, in addition to the fluidising effect obtained, exceeding that of silicon, the mechanical characteristics of the alloy are improved as well, as can be observed from the data illustrated below.
  • germanium and small quantities of silicon this combination allows to obtain "clean and shiny" castings, without causing the immediate degradation of the mechanical properties as can be observed with the use of silicon alone in greater quantities.
  • the gold alloy of the present invention is defined in claim 1.
  • the fundamental characteristic of said alloy is that of containing germanium as a fluidising element, while being able to be free of silicon.
  • the alloy can also contain, in a proportion not exceeding 4% by weight, at least one of the elements of the group constituted by cobalt, manganese, tin and indium.
  • one ore more deoxidising elements such as magnesium, silicon, boron and lithium can also be added, each in a proportion not exceeding 0.15% by weight.
  • the alloy can also comprise refining elements such as ruthenium, rhenium and platinum in a suitable quantity and preferably not exceeding 0.4% by weight.
  • a first preferred range is the one associated with obtaining 18 carat gold, in which the quantity of gold present in the alloy is between 74% and 77% by weight.
  • a second preferred range is the one associated with obtaining 14 carat gold, in which the quantity of gold present in the alloy is between 57% and 60% by weight.
  • a preferential process comprises the following phases:
  • the present invention achieves important advantages.
  • Figure 1 shows the variation in the dimensions of the crystal grain of the alloy as a result of the addition, thereto, of the elements and compounds indicated in the x-coordinate. It is evident that the influence of Silicon (CuSi) on the increase in grain size is considerably lesser than the influence of Germanium (Ge).
  • Figure 2 shows the effect of the concentration of Silicon and germanium on the grain dimension of the gold alloy.
  • a low concentration of silicon in the graph from 0 to 300 ppm, entails a considerable increase in crystal grain size, even exceeding the size increase caused by additions of germanium in concentrations that are 10 times greater.
  • Figure 4 shows the percent variation of the lengthening of the gold alloy subjected to traction test, as a function of the addition to the alloy of the elements and compounds, indicated in the x-coordinate, in equal quantities.
  • germanium instead of silicon also yielded positive effects on the percent of lengthening of the alloy following the traction test.
  • the alloys obtained according to the present invention (be they gold alloys or master alloys for obtaining gold alloys), thanks to the small size of the crystal grain, are normally able not require the use of other refining elements.
  • silicides does not take place, thanks to the absence, or near absence, of silicon.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Silicon Compounds (AREA)
  • Adornments (AREA)
  • Contacts (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (2)

  1. Goldlegierung, dadurch gekennzeichnet, dass sie in Gewichtsanteilen wenigstens wie folgt enthält:
    Gold: innerhalb des Bereiches 74 AU 77% oder des
    Bereiches 57 AU 60%;
    Iridium: 0 < Ir 0.2%;
    Germanium: 0 < Ge 2%;
    Silber: 0 < Ag 34%;
    Zink: 0 < Zn 12%;
    Kupfer: ausreichend Cu zum Erreichen von 100;
    und optional eins oder mehrere der folgenden Elemente:
    Silikon: 0 < Si 0.15%;
    Lithium: 0 < Li 0.15%;
    nicht mehr als 4% Gewichtsanteil von wenigstens einem der Elemente der Gruppe bestehend aus Kobalt, Zinn und Indium;
    nicht mehr als 0.15% Gewichtsanteil von wenigstens einem der Elemente der Gruppe bestehend aus Magnesium und Boron; und
    nicht mehr als 0.4% Gewichtsanteil von wenigstens einem der Elemente der Gruppe bestehend aus Ruthenium, Rhenium, und Platin.
  2. Vorlegierung zum Erhalten von Goldlegierungen nach Patentanspruch 1, dadurch gekennzeichnet, dass sie in Gewichtsanteilen wenigstens wie folgt enthält:
    Iridium: 0 < Ir 0.4%;
    Germanium: 0 < Ge 4%;
    Silber: 0 < Ag 72%;
    Zink: 0 < Zn 25%; Kupfer: ausreichend Cu zum Erreichen von 100;
    und optional eins oder mehrere der folgenden Elemente:
    Silikon: 0 < Si 0.36%;
    Lithium: 0 < Li 0.36%;
    nicht mehr als 8% Gewichtsanteil von wenigstens einem der Elemente der Gruppe bestehend aus Kobalt, Zinn und Indium;
    nicht mehr als 0.36% Gewichtsanteil von wenigstens einem der Elemente der Gruppe bestehend aus Magnesium und Boron; und
    nicht mehr als 0.96% Gewichtsanteil von wenigstens einem der Elemente der Gruppe bestehend aus Ruthenium, Rhenium, und Platin.
EP01830349A 2001-05-30 2001-05-30 Goldlegierungen und Vorlegierungen zu deren Herstellung Revoked EP1266974B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP01830349A EP1266974B1 (de) 2001-05-30 2001-05-30 Goldlegierungen und Vorlegierungen zu deren Herstellung
AT01830349T ATE278045T1 (de) 2001-05-30 2001-05-30 Goldlegierungen und vorlegierungen zu deren herstellung
DE60105987T DE60105987D1 (de) 2001-05-30 2001-05-30 Goldlegierungen und Vorlegierungen zu deren Herstellung
ES01830349T ES2227106T3 (es) 2001-05-30 2001-05-30 Aleaciones de oro y aleaciones madres para obtener tales aleaciones de oro.
US10/156,386 US20030012679A1 (en) 2001-05-30 2002-05-29 Gold alloys and master alloys for obtaining them

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01830349A EP1266974B1 (de) 2001-05-30 2001-05-30 Goldlegierungen und Vorlegierungen zu deren Herstellung

Publications (2)

Publication Number Publication Date
EP1266974A1 EP1266974A1 (de) 2002-12-18
EP1266974B1 true EP1266974B1 (de) 2004-09-29

Family

ID=8184548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01830349A Revoked EP1266974B1 (de) 2001-05-30 2001-05-30 Goldlegierungen und Vorlegierungen zu deren Herstellung

Country Status (5)

Country Link
US (1) US20030012679A1 (de)
EP (1) EP1266974B1 (de)
AT (1) ATE278045T1 (de)
DE (1) DE60105987D1 (de)
ES (1) ES2227106T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2476615C1 (ru) * 2012-03-07 2013-02-27 Юлия Алексеевна Щепочкина Сплав на основе золота
RU2604145C1 (ru) * 2015-07-17 2016-12-10 Сергей Алексеевич Костин Сплав на основе золота, упрочненный интерметаллидами, содержащими кобальт, (варианты)
RU2652900C1 (ru) * 2016-12-06 2018-05-03 Юлия Алексеевна Щепочкина Сплав на основе золота

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US20050100471A1 (en) * 2002-09-13 2005-05-12 Taylor Arthur D. White gold alloy
GB2418432A (en) * 2004-09-23 2006-03-29 Middlesex Silver Co Ltd Silver alloy and its production using a master metal
GB2434376A (en) * 2006-01-23 2007-07-25 Middlesex Silver Co Ltd Making boron containing gold alloys using a master alloy
TR200701159A2 (tr) * 2007-02-26 2008-09-22 Güner Kuyumculuk Kalip Maki̇na San. Ve Ti̇c. Ltd. Şti̇. Altın ve diğer madenlerin birleştirilmesi yönteminde yenilik
JP2008301063A (ja) * 2007-05-30 2008-12-11 Panasonic Corp 家庭用電器製品報知システム、携帯端末装置、家庭用電器製品および作業完了通知方法
US20090317291A1 (en) * 2008-06-20 2009-12-24 Annette Gertge Variable karat gold alloys
US20090317292A1 (en) * 2008-06-20 2009-12-24 Gertge Annette T Variable karat gold alloys
CA2761291A1 (en) * 2009-05-12 2010-11-18 Jostens, Inc. Gold alloys
CN102386545B (zh) * 2011-03-11 2013-05-29 清华大学深圳研究生院 一种含稀土元素的滑动电接触材料制造工艺
US9005522B2 (en) 2012-08-30 2015-04-14 Jostens, Inc. Silver alloy
RU2507284C1 (ru) * 2012-12-13 2014-02-20 Федеральное Государственное Автономное Образовательное Учреждение Высшего Профессионального Образования "Сибирский Федеральный Университет" Способ модифицирования сплавов на основе золота
ITPD20130002A1 (it) * 2013-01-11 2014-07-12 Legor Group S P A Composizione di lega madre per la produzione di leghe di oro bianco e lega di oro bianco così ottenuta
ITPD20130003A1 (it) * 2013-01-11 2014-07-12 Legor Group S P A Composizione di lega madre per la produzione di leghe di oro con innovativo sistema di affinatori e lega di oro ottenuta mediante tale composizione di lega madre
ITVI20130118A1 (it) * 2013-04-24 2014-10-25 Progold S P A Metodo per la produzione di leghe d¿oro bianco per la realizzazione di prodotti in materiale prezioso
WO2015193659A2 (en) * 2014-06-16 2015-12-23 Allied Gold Limited Alloy compositions
WO2016084038A2 (en) * 2014-11-28 2016-06-02 Peretti Diego Master alloy used for making a white gold alloy
RU2626260C1 (ru) * 2016-08-17 2017-07-25 Федеральное государственное автономное образовательное учреждение высшего образования "Сибирский федеральный университет" Способ изготовления биметаллической проволоки из драгоценных металлов
WO2022180650A1 (en) * 2021-02-23 2022-09-01 Italfimet Srl Process for galvanic electrodeposition and associated galvanic bath
IT202100017651A1 (it) * 2021-07-05 2023-01-05 Metaltech S R L Lega madre per la realizzazione di leghe di un metallo prezioso, metodo di produzione della lega madre e lega d’oro comprendente la lega madre

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2476615C1 (ru) * 2012-03-07 2013-02-27 Юлия Алексеевна Щепочкина Сплав на основе золота
RU2604145C1 (ru) * 2015-07-17 2016-12-10 Сергей Алексеевич Костин Сплав на основе золота, упрочненный интерметаллидами, содержащими кобальт, (варианты)
RU2652900C1 (ru) * 2016-12-06 2018-05-03 Юлия Алексеевна Щепочкина Сплав на основе золота

Also Published As

Publication number Publication date
ES2227106T3 (es) 2005-04-01
ATE278045T1 (de) 2004-10-15
EP1266974A1 (de) 2002-12-18
DE60105987D1 (de) 2004-11-04
US20030012679A1 (en) 2003-01-16

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