WO2016084038A2 - Alliage mère utilisé pour la fabrication d'un alliage d'or blanc - Google Patents

Alliage mère utilisé pour la fabrication d'un alliage d'or blanc Download PDF

Info

Publication number
WO2016084038A2
WO2016084038A2 PCT/IB2015/059164 IB2015059164W WO2016084038A2 WO 2016084038 A2 WO2016084038 A2 WO 2016084038A2 IB 2015059164 W IB2015059164 W IB 2015059164W WO 2016084038 A2 WO2016084038 A2 WO 2016084038A2
Authority
WO
WIPO (PCT)
Prior art keywords
weight percentage
master alloy
ranges
weight
germanium
Prior art date
Application number
PCT/IB2015/059164
Other languages
English (en)
Other versions
WO2016084038A3 (fr
Inventor
Diego PERETTI
Mauro DI SIRO
Original Assignee
Peretti Diego
Di Siro Mauro
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 Peretti Diego, Di Siro Mauro filed Critical Peretti Diego
Priority to CN201580074680.4A priority Critical patent/CN107208186A/zh
Publication of WO2016084038A2 publication Critical patent/WO2016084038A2/fr
Publication of WO2016084038A3 publication Critical patent/WO2016084038A3/fr

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
    • C22C1/02—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
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • 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
    • 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
    • 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 generally finds application in the field of metal alloys, and particularly alloys used in the jewelry industry, and relates to a master alloy for making white gold alloys.
  • the invention also relates to a gold alloy for making white gold articles.
  • Such master alloys include metals selected from the group comprising silver, copper, zinc and nickel, in weight ratios varying with the karat grade of the desired finished article.
  • a 1 8 kt white gold article generally comprises 75% gold, 1 6% copper, 5% nickel and about 4% zinc by weight.
  • nickel is known to mainly act on the gold article to change its color in view of obtaining a material of weaker color, arbitrarily identified as white gold.
  • manganese-containing alloys are highly toxic to the human body and relatively hard to work, as this element tends to oxidize rapidly and completely in contact with air.
  • US2005/0201887 discloses a germanium-containing metal alloy for making 14 kt white gold articles, whose composition by weight includes 58,34% gold, 35 to 40% silver as a whitening element, 0,5 to 1 ,8% tin and 0,1 to 0,75% germanium.
  • This alloy has the drawback of comprising very small amounts of germanium, which have a non-optimal gold whitening effect, and involve the risk that the finished white articles have an excessively yellowish, matte and low-brightness finish.
  • the weight ratio of germanium to the other elements cannot be increased in view of achieving an optimal whitening effect, as this would increase the brittleness and complexity of the alloy matrix.
  • the technical problem that the present invention intends to solve is to provide a master alloy that has a high whitening effect on gold, optimal workability and a low cost.
  • the object of the present invention is to overcome the above drawbacks, by providing a master alloy for making a white gold alloy that is highly efficient and relatively cost-effective.
  • a particular object of the present invention is to provide a master alloy for making a white gold alloy that has a considerable whitening effect on gold without using nickel, palladium and/or manganese.
  • a further object of the present invention is to provide a master alloy for making a white gold alloy that allows the finished article to maintain a bright shiny appearance.
  • Another object of the present invention is to provide a master alloy for making a white gold alloy that has such mechanical properties as to afford easy workability throughout the steps of the process of making the white gold alloy.
  • Yet another object of the present invention is to provide a master alloy for making a white gold alloy that comprises readily available and relatively low-cost elements.
  • a further object of the present invention is to provide a master alloy for making a white gold alloy that is non-toxic to the human body.
  • Another object of the present invention is to provide a gold alloy with a Yellow Index of less than 32, that is obtained from the master alloy, and has a particularly bright color.
  • the invention relates to a gold alloy with a Yellow Index of less than 32, comprising a mixture of gold and the above mentioned master alloy, as defined in claim 14.
  • the invention relates to the use of the gold alloy for making a white gold article, as defined in claim 1 5.
  • the present invention relates to a master alloy for use in the jewelry industry, and adapted to be mixed with a predetermined weight percentage of gold to obtain a white gold alloy.
  • the present invention also relates to a white gold alloy obtained using predetermined weight percentages of gold that define precise karat values, and mixed with such master alloy.
  • the gold alloy has a Yellow Index of less than 32 and is used to make white gold articles.
  • the master alloy shall have to be first mixed with a predetermined weight percentage of gold and will later undergo a melting process as a result of which the gold alloy will be obtained.
  • the gold alloy may be formed into 9 kt, 1 0 kt, 14 kt or 1 8 kt white gold articles, in which the weight percentages of gold in use are 37,5%, 41 ,7%, 58,5% and 75% respectively, based on the total weight of the article.
  • the master alloy comprises a weight percentage of germanium for gold whitening purposes.
  • the weight percentage of germanium may range from 4% to 25% based on the total weight of the master alloy.
  • germanium appears with atomic number thirty- two, atomic radius 1 25 pm, and an electronegativity value of 2,01 by Pauling scale.
  • This element has a natural silvery white color and has a greater gold-whitening capacity than other elements such as palladium, nickel, manganese and silver.
  • germanium has anti-oxidant properties, useful to remove any compounds of less noble elements that might form during melting of the master alloy with the weight percentage of gold.
  • the master alloy further comprises a predetermined weight percentage of at least one plasticizing metal which is adapted to impart malleability to the master alloy.
  • the plasticizing metal may be zinc, and its weight percentage may be less than 35% and preferably range from 5 to 26% based on the total weight of the master alloy.
  • Zinc has a high degree of inherent malleability and its addition into the master alloy makes the latter highly malleable. Such malleability remains almost unaltered even upon melting of the master alloy with gold.
  • zinc has a low cost and its interaction with gold also has a light whitening effect thereupon, even though its whitening action is much weaker than that of germanium.
  • the plasticizing metal may be silver, and its weight percentage may range from 1 0 to 20% based on the total weight of the master alloy.
  • Silver further adds nobility to the master alloy and its presence ensures that the color of the white gold article will remain substantially constant with time, while protecting the remaining metals of the master alloy against oxidation caused by oxygen in air.
  • the master alloy further comprises a weight percentage of a binding metal other than the plasticizing metal, which is adapted to form a solid solution with germanium.
  • the solid solution is a physico-chemical state of the alloys in which the crystal structure of a solvent, here the binding metal, does not change upon mixing with a solute, here germanium.
  • the binding metal is selected from the group of elements whose electronegativity value is substantially equal to that of germanium, for homogeneous distribution of the latter within the solid solution.
  • Electronegativity is a relative measure of the ability of an atom to attract electrons within a chemical bond and is deemed to be one of the conditions for the formation of a homogeneous solid solutions, in Hume- Rothery rules.
  • the element that constitutes the solute has an electronegativity value similar to that of the element that constitutes the solvent, it will tend to be incorporated into the crystal lattice and replace the solvent particles without altering the physico- chemical properties, namely hardness.
  • a binding metal whose electronegativity is similar to that of germanium allows the use of greater weight percentages of the latter, thereby affording a greater gold whitening effect without affecting the physico-chemical properties of the master alloy.
  • the article obtained from the master alloy of the invention will exhibit a color that is typically defined as white by the skilled person, as well as a high degree of workability with the known forming processes as used in the jewelry industry to obtain the finished article.
  • the binding metal may be selected from the group of elements having an atomic radius that is 7% to 8% greater than the atomic radius of germanium.
  • This condition fulfills the second of Hume-Rothery rules, according to which the atomic radius of the two elements that form the solid solution must not differ by more than 15%.
  • the binding metal is copper, which has an atomic radius of 135 pm and an electronegativity of 1 ,9 by Pauling scale.
  • both copper and germanium have a body-centered cubic crystal structure, thereby fulfilling the third Hume-Rothary rule for the formation of a solid solution.
  • the weight percentage of copper may range from 50% to 90% based on the total weight of the master alloy.
  • the master alloy may comprise 4% to 15% by weight germanium, 50% to 90% by weight copper, and 5% to 26% by weight zinc, based on the total weight of the master alloy.
  • the master alloy may comprise 4% to 15% by weight germanium, 50% to 80% by weight copper, 5% to 26% by weight zinc, and 10% to 20% by weight silver, based on the total weight of the master alloy.
  • Additional elements may be further provided for imparting chemico- physical properties to the master alloy.
  • the master alloy may comprise 0,01 % to 0,5% by weight iridium, ruthenium or rhenium and less than 1 0% by weight indium, based on the total weight of the master alloy.
  • the first three elements may be used as grain refiners, thereby improving the mechanical strength of the master alloy, whereas indium helps to reduce the surface porosity of the article.
  • Example I First master alloy composition for a 1 8 kt white gold article
  • the master alloy comprises 10% by weight germanium, 25% by weight zinc and 65% by weight copper.
  • the weight percentages of the elements are based on the total weight of the master alloy.
  • This composition may be described otherwise, by also including the weight percentage of gold corresponding to the 18 kt value, i.e. 75% based on the total weight of the article.
  • the article will comprise 2,5% by weight germanium, 6,25% by weight zinc and 1 6,25% by weight copper.
  • Example II Second master alloy composition for a 1 8 kt white gold article
  • the master alloy comprises 7% by weight germanium, 25% by weight zinc, 67,95% by weight copper and 0,05% by weight iridium.
  • the weight percentages of the elements are based on the total weight of the master alloy.
  • This composition may be also described by including the weight percentage of gold corresponding to the 1 8 kt value, whereby the article will comprise 1 ,75% by weight germanium, 6,25% by weight zinc, 1 6,99% by weight copper and 0,01 2% by weight iridium.
  • Example III Third master alloy composition for a 18 kt white gold article
  • the master alloy comprises 10% by weight germanium, 25% by weight zinc, 55% by weight copper, 1 0% by weight silver and 0,05% by weight iridium.
  • the weight percentages of the elements are based on the total weight of the master alloy.
  • This composition may be also described by including the weight percentage of gold corresponding to the 1 8 kt value, whereby the article will comprise 2,5% by weight germanium, 6,25% by weight zinc, 1 3,75% by weight copper, 2,5% by weight silver and 0,01 25% by weight iridium.
  • Example IV Fourth master alloy composition for a 1 8 kt white gold article
  • the master alloy comprises 10% by weight germanium, 25% by weight zinc, 60% by weight copper, 5% by weight indium and 0,05% by weight iridium.
  • the weight percentages of the elements are based on the total weight of the master alloy.
  • composition may be also described otherwise by including the gold weight percentage corresponding to the 1 8 kt value, whereby the article will comprise 2,5% by weight germanium, 6,25% by weight zinc, 1 5% by weight copper, 1 ,25% by weight indium and 0,01 25% by weight iridium.
  • Example V Fourth master alloy composition for a 1 8 kt white gold article
  • the master alloy comprises 15% by weight germanium, 1 5% by weight zinc and 70% by weight copper.
  • the weight percentages of the elements are based on the total weight of the master alloy.
  • composition may be also described otherwise by including the gold weight percentage corresponding to the 1 8 kt value, whereby the article will comprise 3,75% by weight germanium, 3,75% by weight zinc and 1 7,5% by weight copper.
  • Example VI First master alloy composition for a 14 kt white gold article
  • the master alloy comprises 6% by weight germanium, 20% by weight zinc, 73,95% by weight copper and 0,05% by weight iridium.
  • the weight percentages of the elements are based on the total weight of the master alloy.
  • This composition may be described otherwise, by also including the weight percentage of gold corresponding to the 14 kt value, i.e. 58,5% based on the total weight of the article.
  • the master alloy will comprise 2,49% by weight germanium, 8,3% by weight zinc, 30,69% by weight copper and 0,021 % by weight iridium.
  • the master alloy comprises 10% by weight germanium, 20% by weight zinc, 69.95% by weight copper and 0.05% by weight iridium.
  • the weight percentages of the elements are based on the total weight of the master alloy.
  • the article When expressing the composition with the inclusion of the gold weight percentage corresponding to the 14 kt value, the article will comprise 4,1 5% by weight germanium, 8,3% by weight zinc, 29,03% by weight copper and 0,021 % by weight iridium.
  • the master alloy comprises 4,3% by weight germanium, 20% by weight zinc, 75,67% by weight copper and 0,03% by weight ruthenium.
  • the weight percentages of the elements are based on the total weight of the master alloy.
  • This composition may be described otherwise, by also including the weight percentage of gold corresponding to the 1 0 kt value, i.e. 41 ,7% based on the total weight of the article.
  • the master alloy will comprise 2,5% by weight germanium, 1 1 ,66% by weight zinc, 44,1 1 % by weight copper and 0,01 7% by weight ruthenium.
  • the master alloy comprises 4,3% by weight germanium, 20% by weight zinc, 75,67% by weight copper and 0,03% by weight ruthenium.
  • the weight percentages of the elements are based on the total weight of the master alloy.
  • This composition may be described otherwise, by also including the weight percentage of gold corresponding to the 9 kt value, i.e. 37,5% based on the total weight of the article.
  • the master alloy will comprise 2,68% by weight germanium, 1 2,5% by weight zinc, 47,29% by weight copper and 0,01 9% by weight ruthenium.
  • the present invention may find application in industry, because it can be produced on an industrial scale in jewelry metalworking factories.

Landscapes

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

Abstract

L'invention concerne un alliage mère conçu pour être mélangé avec un pourcentage en poids prédéterminé d'or pour obtenir un alliage d'or blanc contenant un pourcentage en poids prédéterminé de germanium à des fins de blanchiment de l'or, un pourcentage en poids prédéterminé d'au moins un métal de plastification, conçu pour conférer de la malléabilité à l'alliage mère et une quantité prédéterminée d'un métal liant pour former une solution solide. Le métal liant est choisi dans le groupe d'éléments dont la valeur d'électronégativité est sensiblement égale à celle de germanium, pour la distribution homogène de ce dernier à l'intérieur de la solution solide. L'invention concerne également un alliage d'or avec un indice de jaune inférieur à 32, comprenant un pourcentage en poids prédéterminé d'or mélangé avec l'alliage mère pour fabriquer un article d'or blanc.
PCT/IB2015/059164 2014-11-28 2015-11-27 Alliage mère utilisé pour la fabrication d'un alliage d'or blanc WO2016084038A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201580074680.4A CN107208186A (zh) 2014-11-28 2015-11-27 用于制造白金合金的母合金

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI20140304 2014-11-28
ITVI2014A000304 2014-11-28

Publications (2)

Publication Number Publication Date
WO2016084038A2 true WO2016084038A2 (fr) 2016-06-02
WO2016084038A3 WO2016084038A3 (fr) 2016-08-04

Family

ID=52464529

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/059164 WO2016084038A2 (fr) 2014-11-28 2015-11-27 Alliage mère utilisé pour la fabrication d'un alliage d'or blanc

Country Status (2)

Country Link
CN (1) CN107208186A (fr)
WO (1) WO2016084038A2 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050201887A1 (en) 2004-03-15 2005-09-15 United Precious Metal Refining, Inc. White gold alloy compositions

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6726877B1 (en) * 1993-11-15 2004-04-27 Anthony Phillip Eccles Silver alloy compositions
US5384089A (en) * 1994-05-02 1995-01-24 Diamond; Lawrence H. Yellow karat gold casting alloys
DE4423646C1 (de) * 1994-07-06 1995-08-17 Wieland Edelmetalle Nickelfreies Weißgold für Schmuckzwecke
JP2002105558A (ja) * 2000-09-29 2002-04-10 Shoei Shokai:Kk 装身具用金合金
DE60105987D1 (de) * 2001-05-30 2004-11-04 Leg Or S R L Goldlegierungen und Vorlegierungen zu deren Herstellung
JP2006045630A (ja) * 2004-08-05 2006-02-16 Leda Co Ltd 金合金
US20080078484A1 (en) * 2004-09-23 2008-04-03 Middlesex Silver Co. Limited Copper-Boron Master Alloy And Its Use In Making Silver-Copper Alloys
JP2008297564A (ja) * 2007-05-29 2008-12-11 Leda Co Ltd 金合金
US20090317291A1 (en) * 2008-06-20 2009-12-24 Annette Gertge Variable karat gold alloys

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050201887A1 (en) 2004-03-15 2005-09-15 United Precious Metal Refining, Inc. White gold alloy compositions

Also Published As

Publication number Publication date
WO2016084038A3 (fr) 2016-08-04
CN107208186A (zh) 2017-09-26

Similar Documents

Publication Publication Date Title
JP6389561B2 (ja) 金とチタンの軽い貴金属合金、及びこのような金とチタンの軽い貴金属合金で作られた計時器又は宝飾類用の部品
AU784121B2 (en) Hard noble-metal alloy member and process for producing the same
JP7301057B2 (ja) 耐変色性金合金及びその製造方法
JP2780611B2 (ja) 少量成分の合金化で硬質化した金装飾品材
EP2719780A1 (fr) Composant d'alliage de métal haute performance en cristallite fine et procédé pour fabriquer celui-ci
JP7419240B2 (ja) ５ｎ標準に適合する色を有する金合金及びその製造方法
EP2420583B1 (fr) Article de bijou en métal précieux blanc idéal et résistant
WO2014108848A1 (fr) Composition d'alliage maître pour la production d'alliages d'or blanc et alliage d'or blanc ainsi obtenu
WO2016084038A2 (fr) Alliage mère utilisé pour la fabrication d'un alliage d'or blanc
EP3444364B1 (fr) Alliage à base de platine, son utilisation
US20170241004A1 (en) Amorphous solidifying precious metal alloy based on precious metals
EP2971198B1 (fr) Alliage de métaux précieux destiné à être utilisé en bijouterie et horlogerie
JP2007023375A (ja) Ｇｅイオン溶出Ａｇ合金
US6576187B2 (en) 18 carat grey gold alloy, without nickel and without palladium, for jewellery
DE102012007299A1 (de) Platinlegierung und ein aus dieser Platinlegierung hergestellter Schmuckgegenstand
JP3395915B2 (ja) 少量成分の合金化で硬質化した金装飾品材
US11970762B2 (en) Hard gold alloy with zirconium, titanium and magnesium for jewelry manufacture
JP6600035B2 (ja) 指輪、ネックレスチェーンおよびペンダントヘッド
WO2002018664A1 (fr) Compositions d'alliage d'or 22 carats
EP2650394B1 (fr) Alliage de platine et bijou fabriqué à partir de cet alliage de platine
RU2156824C1 (ru) Сплав на основе золота белого цвета 585 пробы
JP5467445B1 (ja) 装飾用銀合金
JP6326242B2 (ja) 装飾具用銀合金および装飾具
EP2978867B1 (fr) Alliage pour la production de bijoux
JP2012527529A (ja) パラジウム宝石合金

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15823011

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15823011

Country of ref document: EP

Kind code of ref document: A2