EP3783124A1 - Gold timepiece, ornament or jewellery - Google Patents

Gold timepiece, ornament or jewellery Download PDF

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Publication number
EP3783124A1
EP3783124A1 EP19193469.4A EP19193469A EP3783124A1 EP 3783124 A1 EP3783124 A1 EP 3783124A1 EP 19193469 A EP19193469 A EP 19193469A EP 3783124 A1 EP3783124 A1 EP 3783124A1
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EP
European Patent Office
Prior art keywords
gold
weight
alloy according
palladium
gold alloy
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.)
Pending
Application number
EP19193469.4A
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German (de)
French (fr)
Inventor
Denis Vincent
Gregory Kissling
Christian Charbon
Vincent Fays
Stéphane Lauper
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.)
Omega SA
Original Assignee
Omega SA
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 Omega SA filed Critical Omega SA
Priority to EP19193469.4A priority Critical patent/EP3783124A1/en
Priority to JP2020065543A priority patent/JP7112448B2/en
Priority to US16/841,738 priority patent/US11441210B2/en
Priority to CN202010849214.1A priority patent/CN112410643A/en
Publication of EP3783124A1 publication Critical patent/EP3783124A1/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C27/00—Making jewellery or other personal adornments
    • A44C27/001—Materials for manufacturing jewellery
    • A44C27/002—Metallic materials
    • A44C27/003—Metallic 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
    • 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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/12—Selection of materials for dials or graduations markings
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B29/00—Frameworks
    • G04B29/02—Plates; Bridges; Cocks
    • G04B29/027—Materials and manufacturing
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases

Definitions

  • a 9 karat gold alloy having good deformability, as well as improved stress corrosion resistance and tarnish resistance.
  • the invention also relates to a timepiece, jewelry or jewelry piece made from this gold alloy.
  • Zinc also unfortunately has the drawback of polluting the furnaces during casting and recrystallization annealing. This hinders the gold refiners who are constantly subjected to the incessant cleaning of their furnaces avoiding any contamination on other alloys.
  • the object of the present invention is therefore to remedy the drawbacks of the aforementioned prior art by providing a 9 carat gold alloy, exhibiting tarnishing resistance, deformability as well as resistance to stress corrosion which are improved compared with the alloys. 9 carat gold tone of the prior art.
  • Another object of the invention is to provide a 9-carat gold alloy without zinc, with a view to facilitating its implementation.
  • the invention relates to a gold alloy without zinc comprising by weight between 37.5% and 38.5% gold, between 4% and 32% of silver and / or palladium, between 25, 0% and 54.0% copper and between 0 and 10.0% gallium.
  • the invention relates to a gold alloy consisting by weight of 37.5% to 38.5% gold, 4% to 32% silver and / or palladium, 25.0% to 54 , 0% copper, 0 to 10.0% gallium and 0 to 0.05% of an element selected from iridium, rhenium and ruthenium.
  • the present invention also relates to the timepiece, piece of jewelry or jewelry made from this alloy.
  • timepieces, jewelry or jewelry made with this alloy are very interesting from the point of view of their color, their deformability and their resistance to corrosion (in particular stress corrosion) as well as 'to tarnishing.
  • the present invention relates to a zinc-free gold alloy more particularly intended for application in the watchmaking, jewelry or jewelry industry. It thus also relates to timepieces, jewelry or jewelry made from this alloy.
  • timepiece is understood to mean both trim components such as a case, a dial, a dial applique, a bracelet, etc. as movement components such as a plate, a bridge or a balance.
  • the gold alloy according to the invention comprising by weight between 37.5% and 38.5% of gold, silver and / or palladium with a total for these two elements of between 4 and 32%, between 25.0% and 54.0% copper and between 0 and 10.0% gallium. It has the particularity of being zinc-free. It is also nickel, cobalt, iron and manganese free.
  • the gold-based alloy comprises between 5 and 26% by weight of silver and / or palladium.
  • the gold-based alloy comprises between 6% to 19.5% by weight of silver and / or palladium.
  • the gold-based alloy comprises between 7% and 17% by weight of silver and / or palladium.
  • the gold-based alloy comprises between 7% and 14.5% by weight of silver and / or palladium.
  • the gold-based alloy comprises by weight between 0 and 0.05% (limit included) of an element chosen from iridium, rhenium and ruthenium and advantageously the alloy comprises by weight 0.0025% iridium.
  • the various elements of the composition are melted before being cast.
  • the casting ingot is then deformed with a work hardening rate greater than or equal to 75% distributed in several passes with intermediate anneals carried out at a temperature 650 ° C for 30 minutes.
  • the blanks are sized, for example, by machining.
  • the alloys obtained after deformation and annealing exhibit in the CIELAB color space (in accordance with CIE standards n ° 15, ISO 7724/1, DIN 5033 Part 7, ASTM E-1164) an a * value between 1 and 8, preferably between 5.5 and 7.5, and a b * value between 12 and 18, preferably between 14 and 16.
  • They have a hardness of between 125 and 180 HV1, preferably between 130 and 180 HV1. They have an electrochemical potential greater than or equal to 0.52 volts, the latter being obtained by summing the electrochemical potential of each element of the alloy multiplied by its atomic concentration.
  • Table 1 shows the composition in% by weight of the alloys on the market: No. 843, No. 844 and No. 859 comprising zinc as well as two laboratory alloys No. 846 and No. 848 comprising zinc, these five alloys being comparative examples. Alloys Nos. 849-852, 854-858 and 860 without zinc are 9 carat gold alloys according to the invention.
  • the measured colorimetric values, the measured hardness (HV1) and the calculated electrochemical potentials are also presented in Table 1.
  • the L * a * b * colorimetric values were measured with a KONICA MINOLTA CM-2600d spectrophotometer with a D65 illuminant and a 10 ° viewing angle.
  • the alloys according to the invention have good corrosion resistance (electrochemical potential above 0.52Volt), as well as a hardness in the annealed state easily allowing their deformation (between 130 and 175 H V). They all have an a * value in the 2-7 range and a b * value in the 13-18 range.
  • the 856 alloy has a 4N shade according to the ISO 8654: 2019 standard.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Adornments (AREA)

Abstract

L'invention concerne un alliage d'or sans zinc comprenant en poids entre 37% et 38,5% d'or, entre 4 et 32% de palladium et/ou d'argent, entre 25% et 54% de cuivre et entre 0% et 10% de gallium. L'invention se rapporte également à la pièce d'horlogerie, de bijouterie ou de joaillerie réalisée dans cet alliage.The invention relates to a zinc-free gold alloy comprising by weight between 37% and 38.5% gold, between 4 and 32% palladium and / or silver, between 25% and 54% copper and between 0% and 10% gallium. The invention also relates to the timepiece, jewelry or jewelry piece made from this alloy.

Description

Domaine de l'inventionField of the invention

L'invention concerne un alliage d'or 9 carats présentant une bonne déformabilité, ainsi qu'une résistance à la corrosion sous contrainte et une résistance au ternissement améliorées.Provided is a 9 karat gold alloy having good deformability, as well as improved stress corrosion resistance and tarnish resistance.

L'invention concerne également une pièce d'horlogerie, de bijouterie ou de joaillerie réalisée dans cet alliage d'or.The invention also relates to a timepiece, jewelry or jewelry piece made from this gold alloy.

Arrière-plan de l'inventionBackground of the invention

Les ors 9 carats contiennent majoritairement du zinc pour des raisons d'éclat. Malheureusement, la plupart de ces alliages sont sensibles à la corrosion sous contrainte selon la publication « Stress Corrosion in Gold Alloys » de Jennifer M.M. Dugmore et Charles D. DesForges. Dans le domaine de l'horlogerie, ces alliages se fissurent à l'air libre et ne peuvent plus être laminés aux dimensions souhaitées. Dans le domaine de la bijouterie / joaillerie et dans un cas particulier de sertissage, ces alliages ne peuvent plus être sertis sous risque de perdre une pierre.9 carat gold mostly contains zinc for reasons of shine. Unfortunately, most of these alloys are susceptible to stress corrosion according to the publication "Stress Corrosion in Gold Alloys" by Jennifer M.M. Dugmore and Charles D. DesForges. In the field of watchmaking, these alloys crack in the open and can no longer be rolled to the desired dimensions. In the field of jewelry / jewelry and in a particular case of setting, these alloys can no longer be set at the risk of losing a stone.

Le zinc a aussi malheureusement l'inconvénient de polluer les fours lors des coulées et des recuits de recristallisation. Ceci gêne les affineurs d'or qui sont sans cesse soumis au nettoyage incessant de leurs fours évitant toute contamination sur d'autres alliages.Zinc also unfortunately has the drawback of polluting the furnaces during casting and recrystallization annealing. This hinders the gold refiners who are constantly subjected to the incessant cleaning of their furnaces avoiding any contamination on other alloys.

Dans le domaine de l'horlogerie/bijouterie/joaillerie de luxe, ces alliages sont donc peu utilisés, bien qu'ils présentent l'avantage d'être moins onéreux que des alliages de teinte identique en or 18 carats.In the field of watchmaking / jewelry / luxury jewelry, these alloys are therefore little used, although they have the advantage of being less expensive than alloys of the same color in 18 carat gold.

A notre connaissance, il n'existe aucun alliage du marché d'or 9 carats qui ait été développé avec des caractéristiques de ternissement, de déformabilité et de résistance à la corrosion sous contrainte par rapport aux alliages d'or standards du marché.To our knowledge, there is no alloy on the 9 karat gold market that has been developed with characteristics of tarnish, deformability and resistance to stress corrosion compared to standard gold alloys on the market.

Résumé de l'inventionSummary of the invention

La présente invention a donc pour but de remédier aux inconvénients de l'art antérieur susmentionné en fournissant un alliage d'or 9 carats, présentant une résistance au ternissement, une déformabilité ainsi qu'une résistance à la corrosion sous contrainte améliorées par rapport aux alliages d'or 9 carats de teinte de l'art antérieur.The object of the present invention is therefore to remedy the drawbacks of the aforementioned prior art by providing a 9 carat gold alloy, exhibiting tarnishing resistance, deformability as well as resistance to stress corrosion which are improved compared with the alloys. 9 carat gold tone of the prior art.

L'invention a également pour but de fournir un alliage d'or 9 carats sans zinc, en vue de faciliter sa mise en œuvre.Another object of the invention is to provide a 9-carat gold alloy without zinc, with a view to facilitating its implementation.

A cet effet, l'invention concerne un alliage d'or sans zinc comprenant en poids entre 37,5% et 38,5% d'or, entre 4% et 32% d'argent et/ou de palladium, entre 25,0 % et 54,0 % de cuivre et entre 0 et 10,0% de gallium.To this end, the invention relates to a gold alloy without zinc comprising by weight between 37.5% and 38.5% gold, between 4% and 32% of silver and / or palladium, between 25, 0% and 54.0% copper and between 0 and 10.0% gallium.

Avantageusement, l'invention concerne un alliage d'or constitué en poids de 37,5% à 38,5% d'or, de 4% à 32% d'argent et/ou de palladium, de 25,0 % à 54,0 % de cuivre, de 0 à 10,0% de gallium et de 0 à 0.05% d'un élément choisi parmi l'iridium, le rhénium et le ruthénium.Advantageously, the invention relates to a gold alloy consisting by weight of 37.5% to 38.5% gold, 4% to 32% silver and / or palladium, 25.0% to 54 , 0% copper, 0 to 10.0% gallium and 0 to 0.05% of an element selected from iridium, rhenium and ruthenium.

La présente invention se rapporte également à la pièce d'horlogerie, de bijouterie ou de joaillerie réalisée dans cet alliage.The present invention also relates to the timepiece, piece of jewelry or jewelry made from this alloy.

On a constaté que les pièces d'horlogerie, de bijouterie ou de joaillerie réalisées avec cet alliage sont très intéressantes du point de vue de leur couleur, de leur déformabilité et de leur résistance à la corrosion (en particulier la corrosion sous contrainte) ainsi qu'au ternissement.It has been found that timepieces, jewelry or jewelry made with this alloy are very interesting from the point of view of their color, their deformability and their resistance to corrosion (in particular stress corrosion) as well as 'to tarnishing.

Du point de vue de sa couleur, elles présentent une belle couleur proche de celle du bronze sans les désavantages liés à l'oxydation de ce matériau.From the point of view of its color, they have a beautiful color close to that of bronze without the disadvantages associated with the oxidation of this material.

Description de l'inventionDescription of the invention

La présente invention se rapporte à un alliage d'or sans zinc plus particulièrement destiné à une application dans le domaine horloger, de la bijouterie ou de la joaillerie. Elle se rapporte ainsi également aux pièces d'horlogerie, de bijouterie ou de joaillerie réalisées dans cet alliage. On entend par pièces d'horlogerie aussi bien des composants d'habillage tels qu'un boîtier, un cadran, une applique de cadran, un bracelet, etc. que des composants du mouvement tels qu'une platine, un pont ou un balancier.The present invention relates to a zinc-free gold alloy more particularly intended for application in the watchmaking, jewelry or jewelry industry. It thus also relates to timepieces, jewelry or jewelry made from this alloy. The term “timepiece” is understood to mean both trim components such as a case, a dial, a dial applique, a bracelet, etc. as movement components such as a plate, a bridge or a balance.

L'alliage d'or selon l'invention comprenant en poids entre 37,5% et 38,5% d'or, de l'argent et/ou du palladium avec un total pour ces deux éléments compris entre 4 et 32%, entre 25,0 % et 54,0 % de cuivre et entre 0 et 10,0% de gallium. Il a pour particularité d'être sans zinc. Il est par ailleurs sans nickel, sans cobalt, sans fer et sans manganèse.The gold alloy according to the invention comprising by weight between 37.5% and 38.5% of gold, silver and / or palladium with a total for these two elements of between 4 and 32%, between 25.0% and 54.0% copper and between 0 and 10.0% gallium. It has the particularity of being zinc-free. It is also nickel, cobalt, iron and manganese free.

Avantageusement l'alliage à base d'or comprend entre 5 et 26% en poids d'argent et/ou de palladium.Advantageously, the gold-based alloy comprises between 5 and 26% by weight of silver and / or palladium.

De préférence, l'alliage à base d'or comprend entre 6% à 19.5% en poids d'argent et/ou de palladium.Preferably, the gold-based alloy comprises between 6% to 19.5% by weight of silver and / or palladium.

Plus préférentiellement, l'alliage à base d'or comprend entre 7% et 17% en poids d'argent et/ou de palladium.More preferably, the gold-based alloy comprises between 7% and 17% by weight of silver and / or palladium.

De manière particulièrement préférée, l'alliage à base d'or comprend entre 7% et 14.5% en poids d'argent et/ou de palladium.Particularly preferably, the gold-based alloy comprises between 7% and 14.5% by weight of silver and / or palladium.

En outre, l'alliage à base d'or comprend en poids entre 0 et 0,05% (borne comprise) d'un élément choisi parmi l'iridium, le rhénium et le ruthénium et de manière avantageuse l'alliage comprend en poids 0.0025% d'iridium.In addition, the gold-based alloy comprises by weight between 0 and 0.05% (limit included) of an element chosen from iridium, rhenium and ruthenium and advantageously the alloy comprises by weight 0.0025% iridium.

Pour préparer l'alliage d'or, les différents éléments de la composition sont mis en fusion avant d'être coulés. Le lingot de coulée est ensuite déformé avec un taux d'écrouissage supérieur ou égal à 75% réparti en plusieurs passes avec des recuits intermédiaires réalisés à une température de 650°C pendant 30 minutes. Après refroidissement, les ébauches sont mises à dimension, par exemple, par usinage.To prepare the gold alloy, the various elements of the composition are melted before being cast. The casting ingot is then deformed with a work hardening rate greater than or equal to 75% distributed in several passes with intermediate anneals carried out at a temperature 650 ° C for 30 minutes. After cooling, the blanks are sized, for example, by machining.

Les alliages obtenus après déformation et recuit présentent dans l'espace colorimétrique CIELAB (conforme aux normes CIE n°15, ISO 7724/1, DIN 5033 Teil 7, ASTM E-1164) une valeur a* comprise entre 1 et 8, de préférence entre 5.5 et 7.5, et une valeur b* comprise entre 12 et 18, de préférence entre 14 et 16.The alloys obtained after deformation and annealing exhibit in the CIELAB color space (in accordance with CIE standards n ° 15, ISO 7724/1, DIN 5033 Teil 7, ASTM E-1164) an a * value between 1 and 8, preferably between 5.5 and 7.5, and a b * value between 12 and 18, preferably between 14 and 16.

Ils présentent une dureté comprise entre 125 et 180 HV1, de préférence entre 130 et 180 HV1. Ils présentent un potentiel électrochimique supérieur ou égal à 0.52 volt, ce dernier étant obtenu en sommant le potentiel électrochimique de chaque élément de l'alliage multiplié par sa concentration atomique.They have a hardness of between 125 and 180 HV1, preferably between 130 and 180 HV1. They have an electrochemical potential greater than or equal to 0.52 volts, the latter being obtained by summing the electrochemical potential of each element of the alloy multiplied by its atomic concentration.

Le Tableau 1 montre la composition en %o poids des alliages du marché : N°843, N°844 et N°859 comprenant du zinc ainsi que de deux alliages de laboratoire N°846 et N°848 comprenant du zinc, ces cinq alliages étant des exemples comparatifs. Les alliages N°849-852, 854-858 et 860 sans zinc sont des alliages d'or 9 carats selon l'invention. Les valeurs colorimétriques mesurées, la dureté mesurée (HV1) et les potentiels électrochimiques calculés sont aussi présentés dans le Tableau 1. Les valeurs colorimétriques L*a*b* ont été mesurées avec un spectrophotomètre KONICA MINOLTA CM-2600d avec un illuminant D65 et un angle d'observation de 10°. Tableau 1 Compositions [‰ poids] Dureté E0 Colorimètrie (D65, 10°) Cu. Zn. Ga. Pd. Ag. Au. [HV1] [Volts] L* a* b* 843 Comparatif 423,5 109,0 92,0 375,5 113 0,407 91,5 0,7 20,3 844 376,0 114,0 134,0 376,0 133 0,418 91,9 -0,2 20,0 846 293,0 40,0 291,0 376,0 170 0,621 92,1 2,2 15,8 848 346,8 77,2 200,0 376,0 179 0,508 92,0 0,9 17,8 859 573,0 24,0 27,0 376,0 * 0,504 * * * 849 Invention 311,0 22,0 291,0 376,0 153 0,661 91,9 2,4 14,3 851 384,0 40,0 200,0 376,0 162 0,584 90,8 2,6 16,1 852 311,0 22,0 20,0 271,0 376,0 170 0,665 90,5 3,0 13,0 854 384,0 40,0 20,0 180,0 376,0 171 0,588 89,8 3,3 14,7 855 450,0 40,0 20,0 114,0 376,0 152 0,552 88,6 4,9 15,2 856 500,0 40,0 20,0 64,0 376,0 131 0,526 87,1 6,7 15,0 857 425,0 40,0 20,0 139,0 376,0 164 0,565 87,1 5,7 16,6 858 400,0 40,0 20,0 164,0 376,0 163 0,579 87,3 5,2 16,4 860 500,0 40,0 84,0 376,0 * 0,523 * * * *Pas mesuré Table 1 shows the composition in% by weight of the alloys on the market: No. 843, No. 844 and No. 859 comprising zinc as well as two laboratory alloys No. 846 and No. 848 comprising zinc, these five alloys being comparative examples. Alloys Nos. 849-852, 854-858 and 860 without zinc are 9 carat gold alloys according to the invention. The measured colorimetric values, the measured hardness (HV1) and the calculated electrochemical potentials are also presented in Table 1. The L * a * b * colorimetric values were measured with a KONICA MINOLTA CM-2600d spectrophotometer with a D65 illuminant and a 10 ° viewing angle. <u> Table 1 </u> Compositions [‰ weight ] Hardness E 0 Colorimetry (D65, 10 °) Cu . Zn. Ga. Pd. Ag. At. [HV1] [Volts] L * a * b * 843 Comparative 423.5 109.0 92.0 375.5 113 0.407 91.5 0.7 20.3 844 376.0 114.0 134.0 376.0 133 0.418 91.9 -0.2 20.0 846 293.0 40.0 291.0 376.0 170 0.621 92.1 2.2 15.8 848 346.8 77.2 200.0 376.0 179 0.508 92.0 0.9 17.8 859 573.0 24.0 27.0 376.0 * 0.504 * * * 849 Invention 311.0 22.0 291.0 376.0 153 0.661 91.9 2.4 14.3 851 384.0 40.0 200.0 376.0 162 0.584 90.8 2.6 16.1 852 311.0 22.0 20.0 271.0 376.0 170 0.665 90.5 3.0 13.0 854 384.0 40.0 20.0 180.0 376.0 171 0.588 89.8 3.3 14.7 855 450.0 40.0 20.0 114.0 376.0 152 0.552 88.6 4.9 15.2 856 500.0 40.0 20.0 64.0 376.0 131 0.526 87.1 6.7 15.0 857 425.0 40.0 20.0 139.0 376.0 164 0.565 87.1 5.7 16.6 858 400.0 40.0 20.0 164.0 376.0 163 0.579 87.3 5.2 16.4 860 500.0 40.0 84.0 376.0 * 0.523 * * * * Not measured

Ces calculs et tests montrent clairement que les alliages selon l'invention ont une bonne résistance à la corrosion (potentiel électrochimique au-dessus de 0.52Volt), ainsi qu'une dureté à l'état recuit permettant aisément leur déformation (entre 130 et 175 HV). Ils présentent tous une valeur a* dans l'intervalle 2-7 et une valeur b* dans l'intervalle 13-18. En particulier, l'alliage 856 présente une teinte 4N selon la norme ISO 8654 : 2019.These calculations and tests clearly show that the alloys according to the invention have good corrosion resistance (electrochemical potential above 0.52Volt), as well as a hardness in the annealed state easily allowing their deformation (between 130 and 175 H V). They all have an a * value in the 2-7 range and a b * value in the 13-18 range. In particular, the 856 alloy has a 4N shade according to the ISO 8654: 2019 standard.

Claims (14)

Alliage d'or sans zinc comprenant en poids entre 37.5% et 38.5% d'or, du palladium et/ou de l'argent avec un pourcentage total compris entre 4% et 32%, entre 25% et 54% de cuivre et entre 0% et 10% de gallium.Zinc-free gold alloy comprising by weight between 37.5% and 38.5% gold, palladium and / or silver with a total percentage between 4% and 32%, between 25% and 54% copper and between 0% and 10% gallium. Alliage d'or selon la revendication 1, caractérisé en ce qu'il comprend en poids entre 37.5% et 38.5% d'or, du palladium et/ou de l'argent avec un pourcentage total compris entre 5% et 26%, entre 30% et 53% de cuivre et entre 0% et 8.5% de gallium.Gold alloy according to claim 1, characterized in that it comprises by weight between 37.5% and 38.5% gold, palladium and / or silver with a total percentage between 5% and 26%, between 30% and 53% copper and between 0% and 8.5% gallium. Alliage d'or selon la revendication 1 ou 2, caractérisé en ce qu'il comprend en poids entre 37.5% et 38.5% d'or, du palladium et/ou de l'argent avec un pourcentage total compris entre 6% et 19.5%, entre 39% et 52% de cuivre et entre 2% et 7% de gallium.Gold alloy according to claim 1 or 2, characterized in that it comprises by weight between 37.5% and 38.5% of gold, palladium and / or silver with a total percentage of between 6% and 19.5% , between 39% and 52% copper and between 2% and 7% gallium. Alliage d'or selon l'une des revendications précédentes, caractérisé en ce qu'il comprend en poids entre 37.5% et 38.5% d'or, du palladium et/ou de l'argent avec un pourcentage total compris entre 7% et 17%, entre 41% et 52% de cuivre et entre 2% et 6% de gallium.Gold alloy according to one of the preceding claims, characterized in that it comprises by weight between 37.5% and 38.5% of gold, palladium and / or silver with a total percentage of between 7% and 17 %, between 41% and 52% copper and between 2% and 6% gallium. Alliage d'or selon l'une des revendications précédentes, caractérisé en ce qu'il comprend en poids entre 37.5% et 38.5% d'or, du palladium et/ou de l'argent avec un pourcentage total compris entre 7% et 14.5%, entre 44% et 51% de cuivre et entre 2% et 6% de gallium.Gold alloy according to one of the preceding claims, characterized in that it comprises by weight between 37.5% and 38.5% of gold, palladium and / or silver with a total percentage of between 7% and 14.5 %, between 44% and 51% copper and between 2% and 6% gallium. Alliage d'or selon la revendication 1, caractérisé en ce qu'il comprend en poids entre 37.5% et 38.5% d'or, entre 0 et 5% de palladium, entre 4 et 27% d'argent, entre 25% et 54% de cuivre et entre 0% et 10% de gallium.Gold alloy according to claim 1, characterized in that it comprises by weight between 37.5% and 38.5% gold, between 0 and 5% palladium, between 4 and 27% silver, between 25% and 54 % copper and between 0% and 10% gallium. Alliage d'or selon la revendication 1, caractérisé en ce qu'il comprend en poids entre 37.5% et 38.5% d'or, entre 0% et 5% de palladium, entre 4% et 12% d'argent, entre 45% et 51% de cuivre et entre 3% et 5% de gallium.Gold alloy according to claim 1, characterized in that it comprises by weight between 37.5% and 38.5% gold, between 0% and 5% palladium, between 4% and 12% silver, between 45% and 51% copper and between 3% and 5% gallium. Alliage d'or selon la revendication précédente, caractérisé en ce qu'il comprend en poids 2% de palladium.Gold alloy according to the preceding claim, characterized in which it comprises by weight 2% of palladium. Alliage d'or selon l'une des revendications précédentes, caractérisé en ce qu'il comprend en poids maximum 0,05% d'un élément choisi parmi l'iridium, le rhénium et le ruthénium.Gold alloy according to one of the preceding claims, characterized in that it comprises by weight at most 0.05% of an element chosen from iridium, rhenium and ruthenium. Alliage d'or selon l'une des revendications précédentes, caractérisé en ce qu'il est dépourvu de nickel, de cobalt, de fer et de manganèse.Gold alloy according to one of the preceding claims, characterized in that it is free from nickel, cobalt, iron and manganese. Alliage d'or selon l'une des revendications précédentes, caractérisé en ce qu'il a dans l'espace colorimétrique CIELAB une valeur a* comprise entre 1 et 8 et une valeur b* comprise entre 12 et 18.Gold alloy according to one of the preceding claims, characterized in that it has in the CIELAB color space an a * value between 1 and 8 and a b * value between 12 and 18. Alliage d'or selon l'une des revendications précédentes, caractérisé en ce qu'il a dans l'espace colorimétrique CIELAB une valeur a* comprise entre 5.5 et 7.5 et une valeur b* comprise entre 14 et 16.Gold alloy according to one of the preceding claims, characterized in that it has in the CIELAB color space an a * value between 5.5 and 7.5 and a b * value between 14 and 16. Alliage d'or selon l'une des revendications précédentes, caractérisé en ce qu'il a une dureté HV1 comprise entre 125 et 180 et, de préférence, entre 130 et 180.Gold alloy according to one of the preceding claims, characterized in that it has an HV1 hardness of between 125 and 180 and, preferably, between 130 and 180. Pièce d'horlogerie, de bijouterie ou de joaillerie réalisée dans l'alliage d'or selon l'une des revendications précédentes.Timepiece, jewelry or jewelry made from the gold alloy according to one of the preceding claims.
EP19193469.4A 2019-08-23 2019-08-23 Gold timepiece, ornament or jewellery Pending EP3783124A1 (en)

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EP19193469.4A EP3783124A1 (en) 2019-08-23 2019-08-23 Gold timepiece, ornament or jewellery
JP2020065543A JP7112448B2 (en) 2019-08-23 2020-04-01 Timepiece parts, ornaments or gemstones made of gold
US16/841,738 US11441210B2 (en) 2019-08-23 2020-04-07 Timepiece or piece of jewellery or gemstone jewellery made of gold
CN202010849214.1A CN112410643A (en) 2019-08-23 2020-08-21 Timepiece or piece of jewellery or jewel made of gold

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