EP3144401B1 - Alliage d'or blanc pour bijoux - Google Patents

Alliage d'or blanc pour bijoux Download PDF

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Publication number
EP3144401B1
EP3144401B1 EP16002007.9A EP16002007A EP3144401B1 EP 3144401 B1 EP3144401 B1 EP 3144401B1 EP 16002007 A EP16002007 A EP 16002007A EP 3144401 B1 EP3144401 B1 EP 3144401B1
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EP
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Prior art keywords
weight
alloy
amount
gold
copper
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EP16002007.9A
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German (de)
English (en)
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EP3144401A1 (fr
Inventor
Thomas Laag
Heinz-Günter Schenzel
Andreas Achtstätter
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C Hafner GmbH and Co KG
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C Hafner GmbH and Co KG
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Priority claimed from DE202015006386.1U external-priority patent/DE202015006386U1/de
Priority claimed from DE102015011788.2A external-priority patent/DE102015011788A1/de
Application filed by C Hafner GmbH and Co KG filed Critical C Hafner GmbH and Co KG
Publication of EP3144401A1 publication Critical patent/EP3144401A1/fr
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    • 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 invention relates to the use of a white gold alloy containing gold and silver for the production of a piece of jewelry and a solid piece of jewelry made from such a white gold alloy or a part thereof.
  • a particularly white metal color of a jewelry alloy is desired, since this supports the luster of white precious stones, in particular diamonds, in a particularly good way.
  • White gold jewelery alloys are often made white with additional galvanic rhodium plating, as rhodium is the precious metal with the best white color.
  • the disadvantage of galvanic rhodium plating lies in its limited service life, since the rhodium layer, which is usually only a few fractions of a millimeter thick, is worn out by the use of the piece of jewelry.
  • the white gold base material of the piece of jewelry becomes visible and affects its appearance, since the luster and color of white gold is worse than that of rhodium.
  • a silver alloy which consists essentially of silver, copper and gold, 50% by weight of silver, 10% by weight of copper and 40% by weight of gold being disclosed by way of example.
  • EP 2 818 567 A1 The applicant describes a 14-carat white gold alloy, particularly suitable for use in a stone casting process, which contains 56-60% by weight gold, 25-35% by weight silver, 5-10% by weight zinc, 0 , 2-5% by weight of palladium and 0.05-5% by weight of platinum, the total proportion of palladium and platinum being at most 5% by weight.
  • copper is present in a proportion between more than 0% by weight and 2% by weight, with up to 2% by weight of the silver being replaced by the same amount of copper.
  • the white gold alloy known from the aforementioned publication contains up to 1% by weight of gallium, the weight percentages of the aforementioned components - apart from the usual admixtures and impurities - adding up to 100% by weight -Alloy has a yellowness index of less than 32 and especially of less than 15 and has a hardness between 120-150 HV. It also has excellent oxidation and corrosion resistance. It is nickel-free and easy to process, so it is particularly suitable for a stone casting process due to its melting range.
  • an alloy corresponding to the aforementioned 14-carat white gold alloy with a lower gold content e.g. B, an 8-carat white gold alloy, which then contains approximately 33.3 wt .-% gold, a 9-carat white gold alloy, which contains about 37.5 wt .-% gold, or a 10-carat white gold alloy, which then contains 41.67 wt .-% gold, with the advantageous properties that the 14-carat white gold described above Alloy possesses, should be preserved as far as possible.
  • a soldering paste is known for use in general industrial applications as well as for the dental sector, which - apart from impurities - 37.0 to 76 wt.% gold, 11.0 to 56.5 wt.% silver, 3.0 to 30 % By weight copper and at least one of the additional metals zinc, tin, indium and gallium in a total proportion of 0.5 to 32% by weight.
  • the DE 10 2009 010 149 A1 describes a mokume layer block and a piece of jewelry, an ornament or an ornament made therefrom, which has at least a first layer made of a first alloy and at least a second layer made of a second alloy.
  • the first alloy contains white gold, rose gold, yellow gold, palladium or platinum
  • the second alloy contains about 200 to 300 parts gold and about 800 to 700 parts silver, up to between 30 and 70 parts copper and small amounts of additional metals such as platinum, gold , Aluminum, gallium, indium, silicon, tin or zinc.
  • the Mokume layer block described in this application forms, according to the information in the aforementioned publication, a very easy to process, ductile and color-contrasting starting material for attractive and individual jewelry.
  • the EP 2 045 343 A1 describes a jewelry alloy for the production of nickel-free white gold objects, which has gold in a proportion between 31 and 92% and gallium in a proportion between 1.4 and 30%.
  • the U.S. 5,453,290 A describes a method for a dental restoration in which a substructure is used which is produced from a dental alloy which comprises 40 to 80% by weight gold, 15-50% by weight silver, palladium, platinum in a total proportion of 0 to 20% by weight, at least one of the elements zinc, indium, Tin, gallium, germanium, aluminum, silicon and boron in a total proportion of 0 to 5% by weight, at least one of the elements tantalum, titanium and rhenium in a total proportion of 0 to 5% by weight, at least one of the elements rhodium, Iridium and ruthenium in a total proportion of 0 to 5% by weight, at least one of the elements molybdenum, niobium, tungsten, chromium, copper, cobalt, nickel and iron in a total proportion of 0 to 5% by weight and at least one element the group of rare earths in a total proportion of 0 to 3 wt .-% contains.
  • the object of the present invention is to create a white gold alloy which is an inexpensive alternative to a 14-carat white gold alloy and which is suitable for use in the jewelry and watch industry.
  • a white gold alloy which, as primary alloy components, contains gold in a proportion between 31 and 43% by weight, silver in a proportion between 44 and 62% by weight, copper and / or zinc in each case with a proportion between 2 and 10 wt .-%, at least one of the two aforementioned elements copper and zinc being present, and that the alloy secondary alloy components gallium and / or indium each in a proportion between 0.5 and Contains 2% by weight, the proportions of the aforementioned primary alloy components and the secondary alloy components, apart from customary impurities and admixtures, adding up to 100% by weight.
  • the piece of jewelry according to the invention provides that the piece of jewelry or its component is made of a solid white gold alloy, the primary alloy components of which are gold in a proportion between 31 and 43% by weight, silver in a proportion between 44 and 62% by weight , Copper and / or zinc each in a proportion between 2 and 10% by weight, with at least one of the two aforementioned elements copper and zinc being present, and that the alloy preferably contains gallium and / or indium as secondary alloy components in a proportion between 0.5 and 2% by weight, the proportions of the aforementioned primary alloy components and the optionally provided secondary alloy components, apart from customary impurities and admixtures Add 100% by weight.
  • the measures described create a white gold alloy which is particularly suitable for use in the jewelry and watch industry.
  • the white gold alloy used according to the invention has a yellowness index YI which is in the range of 19 ⁇ 24.5, ie it has a white color which is to be assessed as "Grade 2 (Standard White)".
  • the alloy used according to the invention therefore represents an inexpensive alternative to the white gold alloy mentioned at the outset. It does not achieve its degree of whiteness, which is in the range of “Grade 1 (Premium White)” (such an alloy has a yellowness index YI of ⁇ 19). However, in comparison to known 8-10 carat white gold alloys, it is as white as higher carat white gold alloys conventionally used in the jewelry and watch industry.
  • An essential advantage of the alloy used according to the invention which is predestined for use in the jewelry and watch industry, is that the alloy used according to the invention has a high strength, no or only slight hardening effects occur during its processing and the alloy used according to the invention has a melting interval between 700 to 950 ° C, in particular between 750 and 900 ° C.
  • Such an alloy is particularly suitable for a jewelry casting, in particular for a stone casting.
  • Another advantage of the alloy used according to the invention, which in turn is particularly suitable for use in the field of jewelry and watches, is that the alloy is free of nickel and / or palladium.
  • the alloys used according to the invention have a liquidus temperature of less than 950.degree. C., preferably less than 900.degree. C. and more preferably less than 870.degree.
  • Their solidus temperature is preferably less than 900.degree. C., more preferably less than 825.degree. C. and particularly preferably less than 750.degree.
  • the alloys used according to the invention are further characterized by their high strength, which is significantly higher than that of known 8-, 9- or 10-carat white gold alloys.
  • the measures according to the invention thus propose an alloy suitable for use in the jewelry and watch industry, which is easier to process due to its melting range and its high strength, is particularly suitable for a jewelry casting, in particular for a stone casting, but at the same time has a white color which - as stated above - approaches that of the 14-carat alloy described above. It advantageously does not require any palladium to lighten its color and the use of gold is reduced, so that the alloys described enable the cost-effective production of jewelry or parts thereof.
  • the melt metallurgical alloys described contain, apart from the usual impurities and admixtures, 31-43% by weight gold, 44-62% by weight silver, copper and / or zinc, each in a proportion between 2-10% by weight and gallium and / or indium in a proportion between 0.5-2% by weight, the proportions of the aforementioned primary alloy components gold, silver, copper and zinc as well as the intended secondary alloy components gallium and / or indium differing from those already mentioned above Apart from the usual impurities and admixtures mentioned, add up to 100% by weight.
  • the alloys described above preferably have a gold content between 32 and 35% by weight, more preferably between 33 and 34% by weight and in particular 33.3% by weight or preferably between 35 and 40% by weight, more preferably between 36 and 39% by weight, more preferably between 37-38% by weight and in particular 37.5% by weight or preferably between 40 and 43% by weight, more preferably between 41 and 42% by weight %, and more preferably 41.7% by weight.
  • the aforementioned proportions of gold in the alloys described correspond to the gold content of an 8-carat or 9-carat or 10-carat white gold alloy.
  • the proportion of copper in the aforementioned 8-carat alloys is preferably in the range between 4 and 8% by weight, more preferably in the range between 5 and 7% by weight and more preferably in the range 5.5-6.5% by weight .-%.
  • the copper content is preferably between 2 and 10% by weight and more preferably between 3 and 8% by weight.
  • the copper content is preferably between 2 and 4% by weight, preferably in the range of 3% by weight.
  • the zinc content in these alloys is preferably between 2 and 8% by weight, more preferably between 3 and 7% by weight.
  • Gallium and / or indium are provided as secondary alloy components, each in a proportion between 0.5-2% by weight.
  • the proportions of the primary alloy components gold, silver, copper and / or zinc and the secondary alloy components gallium and / or indium add up to 100% by weight, apart from customary impurities and admixtures.
  • a first group of exemplary embodiments each has a gold content between 31 and 35% by weight, preferably a gold content between 33 and 34% by weight and more preferably a gold content of 33.3% by weight, which is an 8-carat white gold Alloy.
  • the silver content is preferably between 56 and 62% by weight, more preferably between 57 and 60% by weight.
  • the copper content of this group of alloys is preferably between 5 and 8% by weight, more preferably between 6 and 7% by weight.
  • the zinc content is between 2 and 5% by weight, preferably between 3 and 4% by weight.
  • Gallium and / or indium in a proportion between 0.5-2% by weight are provided as alloy components.
  • the melting range of these alloys is between 800 and 950 ° C, they have a hardness between 70 and 120 HV.
  • a first exemplary example of the alloy belonging to this first group of white gold alloys has the proportion of gold mentioned under item 1, it therefore preferably has a gold content between 33 and 34% by weight, preferably 33.3% by weight. %. It has a silver content of 56-58% by weight, preferably 57% by weight.
  • the copper content is between 5.9 and 6.3% by weight, preferably between 6 and 6.2% by weight and more preferably between 6.1 and 6.15% by weight and more preferably 6.11% by weight. -%.
  • the zinc content is between 3 and 4% by weight, preferably between 3.4 and 3.7% by weight, more preferably between 3.5 and 3.6% by weight.
  • the solidus temperature of such an alloy is in the range of 800.degree. C. and its liquidus temperature in the range between 880 and 890.degree. Their hardness is approximately 110 HV.
  • a second exemplary example of an alloy belonging to the aforementioned group of 8-carat gold alloys in turn has the proportion of gold mentioned above under item 1.
  • the proportion of silver is in the range between 58 and 62% by weight, preferably between 59 and 61% by weight and is more preferably 60% by weight.
  • the alloy has a copper content between 5 and 8% by weight, preferably between 6 and 7% by weight and more preferably between 6.6 and 6.8% by weight.
  • the liquidus temperature of such an alloy is in the range between 910 and 930 ° C, the solidus temperature between 840 and 860 ° C. It has a hardness between 90 and 100 HV.
  • a second group of alloys has a gold content which is between 35 and 40% by weight, preferably between 36 and 39% by weight, more preferably between 37 and 38% by weight, and in particular 37.5% by weight , which corresponds to a 9-carat gold alloy.
  • the silver content is between 40 and 62% by weight and is preferably between 50 and 60% by weight and more preferably between 50 and 51% by weight or between 54 and 56% by weight.
  • the copper content is in the range between 2 and 10% by weight, preferably in the range between 3 and 9% by weight and more preferably between 4 and 8% by weight.
  • the proportion of zinc is again between 2 and 10% by weight, preferably between 3 and 7% by weight.
  • the secondary alloy components gallium and / or indium are present in a proportion between 0.5 and 2% by weight, preferably between 0.5 and 1.5% by weight.
  • the solidus temperature of this group of alloys lies in the range between 730 and 910 ° C, the liquidus temperature in the range between 820 and 970 ° C.
  • a first exemplary embodiment of an alloy belonging to this group of white gold alloys has between 36 and 39 wt.% Gold, preferably between 37 and 38 wt.% Gold and more preferably 37.5 wt.% Gold.
  • the proportion of silver is between 54 and 56% by weight and preferably 55% by weight.
  • the proportion of copper is between 2.5 and 4.5% by weight, preferably between 3 and 4% by weight, and is more preferably 3.5% by weight.
  • the proportion of zinc is between 3 and 5% by weight, preferably between 3 and 4.5% by weight, more preferably between 3.5 and 4% by weight.
  • the melting range of such an alloy is between 860 and 930 ° C, the hardness between 72 and 73 HV.
  • a second white gold alloy belonging to the aforementioned group has between 36 and 37 wt.% Gold, preferably 37.5 wt.% Gold, 54-55 wt.% Silver, preferably 55 wt.% Silver, as primary alloy components , 3-4 wt .-% copper, preferably 3.5 wt .-% copper, 1 and 3-4 wt .-% zinc, preferably 3.5 wt .-% zinc.
  • the alloy contains 0.5 to 2% by weight gallium and / or 0.5 to 2% by weight indium, preferably between 0.5 and 1.5% by weight gallium and / or 0.5 and 1, Contain 5% by weight of indium.
  • the melting range of such an alloy is between 865 and 920 ° C, the hardness is approximately 75 and 85 HV.
  • a third exemplary embodiment has the proportions of gold, silver, copper and tin mentioned in section 2.2 above and also has 0.5 to 1.5% by weight of gallium, preferably 1% by weight of gallium.
  • the proportion of gallium is completely or partially replaced by a corresponding proportion of indium.
  • a fourth alloy belonging to this group of 9-carat white gold alloys in turn has the aforementioned proportions of gold and silver and between 2.5 and 3.5% by weight of copper, preferably 3% by weight of copper, and between 3% by weight and 4.5% by weight zinc, preferably 3.5% by weight zinc.
  • gallium preferably 1% by weight gallium, as a secondary alloy component.
  • gallium can be completely or partially replaced by indium
  • the melting range is between 860 and 900 ° C, the hardness is 100 and 120 HV.
  • a fifth precious metal alloy in turn has the aforementioned proportions of gold and silver. It also has 6 to 8% by weight zinc and preferably 7% by weight zinc. It also has 0.5 to 1% by weight gallium and / or indium, preferably 0.5% by weight gallium and / or indium.
  • the melting range is between 840 and 890 ° C, the hardness between 81 and 84 HV.
  • a sixth alloy in turn has the proportions of gold and silver mentioned at the beginning for this group of 9-carat white gold alloys. It has between 2.5 and 3.5 wt.% Copper, preferably 3 wt.% Copper, and between 3 and 5 wt.% Zinc, preferably between 3.6 and 4 wt.% Zinc and more preferably 3.8 wt% zinc. It has 0-1.5% by weight gallium and / or indium, preferably 0.7% by weight gallium and / or indium.
  • the melting range of this alloy is between 800 and 910 ° C, the hardness is between 100 and 110 HV.
  • a seventh alloy has the aforementioned proportion of gold and between 40 and 50% by weight of silver, preferably between 44 and 47% by weight of silver and more preferably between 45 and 46% by weight of silver and more preferably 45.5% by weight .-% silver. It has between 7 and 8% by weight of copper, preferably between 7.5 and 7.6% by weight of copper, and more preferably 7.56% by weight of copper. Their zinc content is between 4 and 5% by weight, preferably between 4.4 and 4.5% by weight.
  • the melting range of this alloy is between 790 and 880 ° C, the hardness between 270 and 290 HV.
  • An eighth alloy which belongs to the aforementioned group of 9-carat white gold alloys, in turn has the aforementioned proportion of gold. It has between 48 and 52% by weight of silver, preferably between 49 and 51% by weight and more preferably 50.5% by weight of silver.
  • the proportion of copper is between 7 and 8% by weight, preferably between 7.1 and 7.2% by weight copper or between 7.5 and 7.6% by weight copper.
  • the proportion of zinc is between 4 and 5% by weight, in particular between 4.1 and 4.2% by weight, or between 4.4 and 4.5% by weight.
  • the alloys have between 0.5 and 1% by weight gallium, preferably between 0.6 and 0.8% by weight gallium, preferably 0.7% by weight gallium.
  • gallium can be completely or partially replaced by a corresponding proportion of indium.
  • the melting range is between 730 and 860 ° C, the hardness is between 155 and 175 HV.
  • Another white gold alloy belonging to this group has the proportions of gold mentioned at the beginning and between 49 and 51% by weight, preferably between 50 and 51% by weight, of silver. It has between 0.7 and 0.8% by weight of copper. The proportion of zinc is between 4 and 5% by weight.
  • the melting range is between 760 and 870 ° C, it has a hardness between 150 and 170 HV.
  • Another white gold alloy has the aforementioned proportions of gold and between 44 and 48% by weight of silver, preferably between 46 and 47% by weight of silver.
  • the proportion of copper is between 9 and 11% by weight, preferably 10 Wt%.
  • the proportion of zinc is in the range between 5 and 6% by weight.
  • the melting range is between 750 and 820 ° C, the hardness is between 210 and 230 HV.
  • Another alloy has the aforementioned proportions of gold and between 46 and 52% by weight of silver, in particular between 48 and 49% by weight of silver.
  • the proportion of copper is between 7 and 10% by weight, in particular between 8 and 9% by weight.
  • the proportion of zinc is between 4 and 6% by weight. in particular between 4.5 and 5.5% by weight.
  • the melting range is between 750 and 840 ° C, the hardness is between 170 and 200 HV.
  • Another alloy has the aforementioned proportion of gold and between 52 and 56% by weight of silver, in particular between 53 and 54% by weight of silver and in particular 53.8% by weight of silver.
  • the proportion of copper is between 4 and 6% by weight, in particular between 5 and 6% by weight and here in particular 5.5% by weight.
  • the proportion of zinc is between 2 and 4% by weight, in particular between 3 and 3.5% by weight.
  • the melting range is between 770 and 900 ° C, the alloy has a hardness between 110 and 120 HV.
  • Another alloy has the aforementioned proportions of gold and between 50 and 52% by weight of silver, in particular 51% by weight of silver and particularly preferably 50.5% by weight of silver.
  • the proportion of copper is between 7 and 9% by weight, in particular 8% by weight.
  • the proportion of zinc is between 3 and 5% by weight, in particular 4% by weight.
  • the melting range is between 750 and 870 ° C, the hardness is between 160 and 170 HV.
  • Another alloy in turn has the aforementioned proportion of gold and silver in the range between 50 and 52% by weight, preferably 51% by weight.
  • the proportion of copper is between 7 and 8% by weight, preferably 7.5% by weight, and the proportion of zinc is in the range between 3 and 5% by weight and is preferably 4% by weight.
  • the melting range is between 760 and 870 ° C, the hardness between 145 and 165 HV.
  • Another alloy has the aforementioned proportions of gold and between 54 and 58% by weight of silver, in particular between 55.5 and 56.5% by weight.
  • the proportion of copper is between 3 and 5% by weight, in particular between 3.5 and 4.5% by weight, in particular 4.2% by weight.
  • the proportion of zinc is between 2 and 3% by weight, in particular it is 2.4% by weight.
  • the melting range of such an alloy is between 850 and 920 ° C, the hardness is approximately 80 and 100 HV.
  • Another alloy provides for the proportion of gold mentioned at the beginning for this group such that silver has a proportion between 57 and 62% by weight, preferably between 58 and 60% by weight and in particular 59% by weight.
  • the proportion of copper is between 2 and 5% by weight, preferably between 3 and 4% by weight and in particular is 3.5% by weight.
  • the melting range of such an alloy is between 900 and 960 ° C and the hardness of this alloy is in the range between 60 and 70 HV.
  • a third group of alloys has gold in a proportion of 40 and 44% by weight, in particular 41 and 43% by weight, here in particular 41 and 42% by weight. It is preferably provided that the gold content is 41.67% by weight, which corresponds to a 10-carat white gold alloy.
  • the proportion of silver is in the range between 52 and 58% by weight, in particular between 53 and 57% by weight, in particular between 54 and 56% by weight and in particular between 55 and 56% by weight.
  • the proportion of copper is between 2 and 5% by weight, preferably between 2 and 4% by weight, in particular between 2.5 and 3.5% by weight.
  • the melting range of such an alloy is between 900 and 960 ° C, the hardness is in the range between 65 and 75 HV.
  • Gallium and / or indium, as described above, can again be used as secondary alloy components.
  • a solid, melt-metallurgically produced white gold alloy is proposed for the production of jewelry or parts thereof, which has a yellowness index YI in the range between 19 and 24.5. It is generally recognized that white gold alloys with a yellowness index YI above 32 can no longer be called "white". Another advantage of the alloys described is that they have no or only slight hardening effects and their melting range is particularly suitable for a jewelry casting, in particular a stone casting. The alloys described therefore represent an inexpensive alternative to the 14-carat white gold alloys mentioned at the beginning, which are particularly suitable for applications in the jewelry and watch industry. In particular, the alloys described are therefore suitable for use in the production of pieces of jewelry such as jewelry, jewelry, jewelry, clocks, watch cases and / or writing implements and a component thereof.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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Claims (13)

  1. Utilisation d'un alliage d'or blanc, qui contient de l'or et de l'argent, pour la fabrication de pièces de bijouterie telles que des bijoux, des articles de joaillerie, des articles de bijouterie, des montres et des boîtiers de montre et/ou des instruments d'écriture et/ou des parties de ceux-ci, dans laquelle l'alliage utilisé comme composants d'alliage primaires contient de l'or dans une proportion entre 31 et 43 % en poids, de l'argent dans une proportion entre 44 et 62 % en poids, du cuivre et/ou du zinc respectivement avec une proportion entre 2 et 10 % en poids, dans laquelle au moins un des deux éléments précités du cuivre et du zinc est présent, caractérisée en ce que l'alliage contient comme composants d'alliage secondaires du gallium et/ou de l'indium respectivement dans une proportion entre 0,5 et 2 % en poids, dans laquelle les proportions des composants d'alliage primaires précités ainsi que des composants d'alliage secondaires, à l'exception des impuretés et additifs usuels, se complètent jusqu'à 100 % en poids.
  2. Utilisation d'un alliage d'or blanc selon la revendication 1, caractérisée en ce que l'alliage d'or blanc utilisé contient de l'or dans une proportion entre 31 et 35 % en poids, de préférence dans une proportion entre 33 et 34 % en poids et de manière davantage préférée dans une proportion de 33,3 % en poids, ou que l'alliage d'or blanc contient de l'or dans une proportion entre 35 et 40 % en poids, de préférence entre 36 et 39 % en poids, de manière davantage préférée entre 37 et 38 % en poids et de manière préférée entre toutes de 37,5 % en poids, ou que l'alliage d'or blanc contient de l'or dans une proportion entre 40 à 43 % en poids, de préférence entre 41 et 43 % en poids, et de manière davantage préférée entre 41 et 42 % et de manière préférée entre toutes dans une proportion de 41,7 % en poids.
  3. Utilisation d'un alliage d'or blanc selon l'une des revendications précédentes, caractérisée en ce que pour l'alliage utilisé la proportion de cuivre s'élève dans la plage entre 2 et 10 % en poids, en particulier dans la plage entre 2 et 4 % en poids ou dans la plage entre 3 et 8 % en poids.
  4. Utilisation d'un alliage d'or blanc selon l'une des revendications précédentes, caractérisée en ce que pour l'alliage utilisé la proportion de zinc s'élève dans la plage entre 2 et 8 % en poids, en particulier dans la plage entre 3 et 7 % en poids.
  5. Utilisation d'un alliage d'or blanc selon l'une des revendications précédentes, caractérisée en ce que pour l'alliage utilisé la proportion de gallium s'élève entre 0,5 à 2 % en poids, de préférence entre 0,5 et 1,5 % en poids.
  6. Utilisation d'un alliage d'or blanc selon l'une des revendications précédentes, caractérisée en ce que pour l'alliage utilisé la proportion d'indium s'élève entre 0,5 et 2 % en poids, de préférence entre 0,5 et 1,5 % en poids.
  7. Pièce de bijouterie telle qu'un bijou, un article de joaillerie, un article de bijouterie, des montres et des boîtiers de montre et/ou des instruments d'écriture ainsi qu'une partie de ceux-ci, caractérisée en ce que la pièce de bijouterie ou sa partie est fabriquée en un alliage d'or blanc massif qui contient comme composants d'alliage primaires de l'or dans une proportion entre 31 et 43 % en poids, de l'argent dans une proportion entre 44 et 62 % en poids, du cuivre et/ou du zinc respectivement avec une proportion entre 2 et 10 % en poids, dans laquelle au moins un des deux éléments précités du cuivre et du zinc est présent, et que l'alliage contient comme composants d'alliage secondaires du gallium et/ou de l'indium respectivement dans une proportion entre 0,5 et 2 % en poids, dans laquelle les proportions des composants d'alliage primaires précités ainsi que des composants d'alliage secondaires, à l'exception des impuretés et additifs usuels, se complètent jusqu'à 100 % en poids.
  8. Pièce de bijouterie selon la revendication 7, caractérisée en ce que l'alliage d'or blanc contient de l'or dans une proportion entre 31 et 35 % en poids, de préférence dans une proportion entre 33 et 34 % en poids et de manière davantage préférée dans une proportion de 33,3 % en poids, ou que l'alliage d'or blanc contient de l'or dans une proportion entre 35 et 40 % en poids, de préférence entre 36 et 39 % en poids, de manière davantage préférée entre 37 et 38 % en poids et de manière préférée entre toutes de 37,5 % en poids, ou que l'alliage d'or blanc contient de l'or dans une proportion entre 40 à 43 % en poids, de préférence entre 41 et 43 % en poids, de manière davantage préférée entre 41 et 42 % en poids et de manière préférée entre toutes de 41,7 % en poids.
  9. Pièce de bijouterie selon la revendication 7, caractérisée en ce que la proportion de cuivre s'élève dans la plage entre 2 et 10 % en poids, en particulier dans la plage entre 2 et 4 % en poids ou dans la plage entre 3 et 8 % en poids.
  10. Pièce de bijouterie selon la revendication 7, caractérisée en ce que la proportion de zinc est dans la plage entre 2 et 8 % en poids, en particulier dans la plage entre 3 et 7 % en poids.
  11. Pièce de bijouterie selon la revendication 7, caractérisée en ce que la proportion de gallium s'élève dans la plage entre 0,5 et 2 % en poids, de préférence entre 0,5 et 1,5 % en poids.
  12. Pièce de bijouterie selon la revendication 7, caractérisée en ce que la proportion d'indium s'élève dans la plage entre 0,5 et 2 % en poids, de préférence s'élève entre 0,5 et 1,5% en poids.
  13. Alliage d'or blanc qui contient de l'or et de l'argent et dans lequel l'alliage contient comme composants d'alliage primaires de l'or dans une proportion entre 31 et 43 % en poids, de préférence entre 31 et 35 % en poids, de l'argent dans une proportion entre 44 et 62 % en poids, du cuivre et/ou du zinc respectivement dans une proportion entre 2 et 10 % en poids, en particulier entre 2 et 4 % en poids ou entre 3 et 8 % en poids, du zinc dans une proportion entre 2 et 8 % en poids, en particulier entre 3 et 7 % en poids, dans lequel au moins un des deux éléments précités du cuivre et/ou du zinc est présent, caractérisé en ce que l'alliage contient comme composants d'alliage secondaires du gallium et/ou de l'indium respectivement dans une proportion entre 0,5 et 2 % en poids, dans lequel les proportions des composants d'alliage primaires précités ainsi que des composants d'alliage secondaires, à l'exception des impuretés et additifs usuels, se complètent jusqu'à 100 % en poids, dans lequel une proportion de gallium s'élève de préférence de 0,5 à 1,5 % en poids et la proportion d'indium s'élève de préférence entre 0,5 et 1,5 % en poids.
EP16002007.9A 2015-09-16 2016-09-15 Alliage d'or blanc pour bijoux Not-in-force EP3144401B1 (fr)

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DE202015006386.1U DE202015006386U1 (de) 2015-09-16 2015-09-16 Weißgold-Legierung
DE102015011788.2A DE102015011788A1 (de) 2015-09-16 2015-09-16 Weißgold-Legierung

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EP3144401B1 true EP3144401B1 (fr) 2021-02-17

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DE3414128C2 (de) * 1984-04-14 1987-04-23 Heraeus Edelmetalle Gmbh, 6450 Hanau Legierungen zur Herstellung von Farbgold-Schmuck
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DE19834858C2 (de) * 1998-08-01 2003-01-02 Hafner C Gmbh & Co Goldlegierung für Schmuckzwecke
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GB2447620A (en) * 2007-03-21 2008-09-24 Sarah J Corbridge Alloys of gold which contain tin
ITVR20070134A1 (it) 2007-09-27 2009-03-28 Legor Group S R L Leghe per oreficeria per la realizzazione di oggetti in oro bianco privi di nichel
DE102009010149B4 (de) 2009-02-23 2016-01-14 Markus Eckardt Mokume-Schichtblock und daraus hergestelltes Schmuckstück, Ziergegenstand oder Verzierung
EP2818567B1 (fr) 2013-06-27 2016-09-07 C. Hafner GmbH + Co. KG Alliage en or blanc, notamment pour l'utilisation dans le cadre d'un procédé de béton coulé

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