EP1266974A1 - Goldlegierungen und Vorlegierungen zu deren Herstellung - Google Patents

Goldlegierungen und Vorlegierungen zu deren Herstellung Download PDF

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Publication number
EP1266974A1
EP1266974A1 EP01830349A EP01830349A EP1266974A1 EP 1266974 A1 EP1266974 A1 EP 1266974A1 EP 01830349 A EP01830349 A EP 01830349A EP 01830349 A EP01830349 A EP 01830349A EP 1266974 A1 EP1266974 A1 EP 1266974A1
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EP
European Patent Office
Prior art keywords
alloy
gold
weight
alloys
elements
Prior art date
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Granted
Application number
EP01830349A
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English (en)
French (fr)
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EP1266974B1 (de
Inventor
Massimo Poliero
Andrea Basso
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Legor Srl
LEG OR Srl
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Legor Srl
LEG OR Srl
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Application filed by Legor Srl, LEG OR Srl filed Critical Legor Srl
Priority to DE60105987T priority Critical patent/DE60105987D1/de
Priority to AT01830349T priority patent/ATE278045T1/de
Priority to EP01830349A priority patent/EP1266974B1/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 comprises at least the following elements:
  • the fundamental characteristic of said alloy is that of containing germanium as a fluidising element, while being able to be free of silicon.
  • the gold alloy can contain (with percentages expressed in weight):
  • nickel or other elements having similar properties, and equivalent thereto
  • suitable quantity allows to obtain alloys of so-called white gold.
  • 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.
  • master alloys for obtaining the above gold alloys they are composed at least by:
  • the master alloy can also comprise, as a weight percentage relative to the total weight of the master alloy:
  • the master alloy can include, in quantities not exceeding 8% by weight, at least one of the elements of the group constituted by cobalt, manganese, tin and indium.
  • the master alloy can further include, in quantities not exceeding 0.36% by weight, at least one of the deoxidising elements of the group constituted by magnesium, silicon, boron and lithium.
  • At least one of the refining elements of the group constituted by ruthenium, rhenium and platinum can be inserted in the master alloy, in quantities not exceeding 0.96% 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)
  • Contacts (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Adornments (AREA)
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
DE60105987T DE60105987D1 (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
EP01830349A EP1266974B1 (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 true EP1266974A1 (de) 2002-12-18
EP1266974B1 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 (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2418432A (en) * 2004-09-23 2006-03-29 Middlesex Silver Co Ltd Silver alloy and its production using a master metal
WO2007083169A1 (en) * 2006-01-23 2007-07-26 Middlesex Silver Co. Limited Master alloy manufacturing
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
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
WO2015193659A3 (en) * 2014-06-16 2016-02-25 Allied Gold Limited Alloy compositions
WO2016084038A3 (en) * 2014-11-28 2016-08-04 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

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050100471A1 (en) * 2002-09-13 2005-05-12 Taylor Arthur D. White gold 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
US20090317292A1 (en) * 2008-06-20 2009-12-24 Gertge Annette T Variable karat gold alloys
US20090317291A1 (en) * 2008-06-20 2009-12-24 Annette Gertge 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
RU2476615C1 (ru) * 2012-03-07 2013-02-27 Юлия Алексеевна Щепочкина Сплав на основе золота
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
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
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
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

Citations (7)

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Publication number Priority date Publication date Assignee Title
DE3019277A1 (de) * 1980-05-21 1981-11-26 Fa. Dr. Th. Wieland, 7530 Pforzheim Kupferfreie goldlegierung fuer zahnaerztliche zwecke
JPS63169347A (ja) * 1986-12-29 1988-07-13 Tokuriki Honten Co Ltd 装飾用白色Ａｕ合金
EP0381994A1 (de) * 1989-02-09 1990-08-16 C. HAFNER GmbH & Co. Hochgoldhaltige Legierung für Schmuckzwecke
DE4320928C1 (de) * 1993-06-24 1994-03-17 Heraeus Kulzer Gmbh Gold-Schmucklegierungen und ihre Verwendung
JPH06330206A (ja) * 1993-05-19 1994-11-29 Nippon Steel Corp 微細な結晶粒からなるＡｕ‐Ｇｅ合金ろう材
JPH09209060A (ja) * 1995-12-01 1997-08-12 Sumitomo Metal Mining Co Ltd 金合金およびその製造方法
JPH11792A (ja) * 1997-06-11 1999-01-06 Sumitomo Metal Mining Co Ltd 高品位金ろう材

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US3841921A (en) * 1973-03-02 1974-10-15 Olin Corp Process for treating copper alloys to improve creep resistance
US3956027A (en) * 1975-04-09 1976-05-11 Olin Corporation Processing copper base alloys
US4780275A (en) * 1984-08-25 1988-10-25 William Prym-Werke Gmbh. & Co. Kg. Corrosion-resistant copper alloy and article containing the same
US6471792B1 (en) * 1998-11-16 2002-10-29 Olin Corporation Stress relaxation resistant brass

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Publication number Priority date Publication date Assignee Title
DE3019277A1 (de) * 1980-05-21 1981-11-26 Fa. Dr. Th. Wieland, 7530 Pforzheim Kupferfreie goldlegierung fuer zahnaerztliche zwecke
JPS63169347A (ja) * 1986-12-29 1988-07-13 Tokuriki Honten Co Ltd 装飾用白色Ａｕ合金
EP0381994A1 (de) * 1989-02-09 1990-08-16 C. HAFNER GmbH & Co. Hochgoldhaltige Legierung für Schmuckzwecke
JPH06330206A (ja) * 1993-05-19 1994-11-29 Nippon Steel Corp 微細な結晶粒からなるＡｕ‐Ｇｅ合金ろう材
DE4320928C1 (de) * 1993-06-24 1994-03-17 Heraeus Kulzer Gmbh Gold-Schmucklegierungen und ihre Verwendung
JPH09209060A (ja) * 1995-12-01 1997-08-12 Sumitomo Metal Mining Co Ltd 金合金およびその製造方法
JPH11792A (ja) * 1997-06-11 1999-01-06 Sumitomo Metal Mining Co Ltd 高品位金ろう材

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PATENT ABSTRACTS OF JAPAN vol. 012, no. 444 (C - 545) 22 November 1988 (1988-11-22) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 02 31 March 1995 (1995-03-31) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 12 25 December 1997 (1997-12-25) *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 04 30 April 1999 (1999-04-30) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2418432A (en) * 2004-09-23 2006-03-29 Middlesex Silver Co Ltd Silver alloy and its production using a master metal
WO2007083169A1 (en) * 2006-01-23 2007-07-26 Middlesex Silver Co. Limited Master alloy manufacturing
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
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
WO2014108848A1 (en) * 2013-01-11 2014-07-17 Legor Group S.P.A. Master alloy composition for producing white gold alloys and white gold alloy thus obtained
WO2014108849A1 (en) 2013-01-11 2014-07-17 Legor Group S.P.A. Master alloy composition for producing gold alloys and gold alloy
CN104903477A (zh) * 2013-01-11 2015-09-09 莱高集团股份公司 用于生产一种或多种金合金的中间合金组合物
WO2015193659A3 (en) * 2014-06-16 2016-02-25 Allied Gold Limited Alloy compositions
WO2016084038A3 (en) * 2014-11-28 2016-08-04 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

Also Published As

Publication number Publication date
DE60105987D1 (de) 2004-11-04
ES2227106T3 (es) 2005-04-01
ATE278045T1 (de) 2004-10-15
EP1266974B1 (de) 2004-09-29
US20030012679A1 (en) 2003-01-16

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