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EP0405044B1 - Gold alloy - Google Patents

Gold alloy Download PDF

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Publication number
EP0405044B1
EP0405044B1 EP89810518A EP89810518A EP0405044B1 EP 0405044 B1 EP0405044 B1 EP 0405044B1 EP 89810518 A EP89810518 A EP 89810518A EP 89810518 A EP89810518 A EP 89810518A EP 0405044 B1 EP0405044 B1 EP 0405044B1
Authority
EP
European Patent Office
Prior art keywords
alloy
gold
temperature
furnace
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.)
Expired - Lifetime
Application number
EP89810518A
Other languages
German (de)
French (fr)
Other versions
EP0405044A1 (en
Inventor
Ludwig Muller
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.)
Muller Ludwig SA
Original Assignee
Muller Ludwig 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 Muller Ludwig SA filed Critical Muller Ludwig SA
Publication of EP0405044A1 publication Critical patent/EP0405044A1/en
Application granted granted Critical
Publication of EP0405044B1 publication Critical patent/EP0405044B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/14—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon

Definitions

  • This invention is in the field of metallurgy and relates more particularly to a gold-based alloy.
  • alloys can be used, one of the components of which gives a predominant color to the whole.
  • copper is added to the gold to obtain a red gold alloy or palladium to obtain a gray gold alloy.
  • gold is added to the gold to obtain a red gold alloy or palladium to obtain a gray gold alloy.
  • gold is added to the gold to obtain a red gold alloy or palladium to obtain a gray gold alloy.
  • gold is distinguished by its blue color due to the oxidation of iron, as mentioned in American patent 4,820,487.
  • the subject of the invention is a gold alloy characterized in that it comprises the following elements: At 74.4 to 94.5% Fe 5 to 25% Or 0.5 to 0.6% where the contents are expressed as a percentage by weight relative to the total weight of the alloy and where the sum of said elements and impurities constitutes 100% of the total weight of the alloy.
  • the contents are more precisely the following: At 85% Fe 14.4% Or 0.6%
  • the contents are: At 75% Fe 24.4% Or 0.6%
  • the invention also extends to a process for treating gold objects made from the claimed alloy, characterized in that the gold object is heated, in an oven brought to a temperature between 450 and 600 ° C, for a predetermined period, under a normal atmosphere, then cooled to room temperature after removal from the oven to obtain a surface bluing due to the oxidation of non-precious elements contained in the alloy.
  • the duration of the heat treatment depends on the one hand on external factors such as degree of humidity or ambient temperature and on the other hand on the size of the objects. It will be longer for large pieces (watch boxes or jewelry for example) than for small pieces (elements of rings, bracelets or clips).
  • the duration of the heat treatment also depends on the temperature of the oven and is shorter when the temperature of the oven is higher.
  • the blueing of an object produced with the first variant of 20-carat alloy is more pronounced than that of an object produced with the second variant of 18-carat alloy, which tends to blue-green.
  • the invention further extends to the use in jewelry of an alloy characterized by the assembly of parts having different colorings making it possible to obtain a decorative effect.
  • the alloy intended to be treated in the oven to obtain a surface coloring can be obtained from a primary alloy.
  • a primary alloy For example, by melting 80% 24-carat fine gold with 20% pre-alloy, the latter must have the following weight contents: At 25% Fe 72% Or 3% to make the first preferred final alloy mentioned above.
  • the weight of the primary alloy is X% of the final alloy obtained by mixing X% of the primary alloy and (100 - X)% of fine gold
  • composition of the primary alloy will be given by the formulas: At [(74.4 to 94.5) - (100-X)] x 100 / X% Fe [5 to 25] x 100 / X% Or [0.5 to 0.6] x 100 / X%
  • the alloy obtained has a melting point of the order of 1000 ° to 1100 °.
  • the parts produced can be assembled by brazing, using conventional brazing alloys, with the usual additions for obtain a range of solders usable at decreasing temperatures from a temperature of about 100 ° lower than the melting temperature of the alloy.

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Adornments (AREA)
  • Materials For Medical Uses (AREA)
  • Powder Metallurgy (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

A gold alloy comprises at least gold, iron and nickel, the gold being present in an amount between about 74.4 and 94.5 percent by weight of the alloy, the iron being present in an amount between about 5.0 and 25.0 percent by weight of the alloy, and the nickel being present in an amount between about 0.5 to about 0.6 percent by weight of the alloy. Heat treatment of the alloy causes a visually observable blue coloration.

Description

Cette invention est du domaine de la métallurgie et concerne plus particulièrement un alliage à base d'or.This invention is in the field of metallurgy and relates more particularly to a gold-based alloy.

Pour réaliser des bijoux et des pièces d'orfèvrerie, il est intéressant d'utiliser des ors ayant différentes colorations, permettant d'obtenir un effet décoratif.To make jewelry and pieces of goldsmithery, it is interesting to use gold with different colors, allowing to obtain a decorative effect.

A cet effet, on peut employer des alliages dont l'un des composants confère une couleur prédominante à l'ensemble. Par exemple, on ajoute du cuivre à l'or pour obtenir un alliage d'or rouge ou du palladium pour obtenir un alliage d'or gris. On peut également utiliser un alliage à base d'or et de fer, qui se distingue par sa couleur bleue due à l'oxydation du fer, comme mentionné dans le brevet américain 4,820.487.For this purpose, alloys can be used, one of the components of which gives a predominant color to the whole. For example, copper is added to the gold to obtain a red gold alloy or palladium to obtain a gray gold alloy. One can also use an alloy based on gold and iron, which is distinguished by its blue color due to the oxidation of iron, as mentioned in American patent 4,820,487.

On peut également obtenir une coloration de surface métallique, par électrodéposition ou par traitement thermique.It is also possible to obtain a metallic surface coloring, by electrodeposition or by heat treatment.

L'invention a pour objet un alliage d'or caractérisé en ce qu'il comprend les éléments suivants : Au 74,4 à 94,5 % Fe 5 à 25 % Ni 0,5 à 0,6 %
où les teneurs sont exprimées en pourcentage en poids par rapport au poids total de l'alliage et où la somme desdits éléments et des impuretés constitue 100% du poids total de l'alliage.The subject of the invention is a gold alloy characterized in that it comprises the following elements: At 74.4 to 94.5% Fe 5 to 25% Or 0.5 to 0.6%
where the contents are expressed as a percentage by weight relative to the total weight of the alloy and where the sum of said elements and impurities constitutes 100% of the total weight of the alloy.

Dans une première forme d'exécution préférentielle, les teneurs sont plus précisément les suivantes : Au 85 % Fe 14,4 % Ni 0,6 % In a first preferred embodiment, the contents are more precisely the following: At 85% Fe 14.4% Or 0.6%

Dans une seconde variante, les teneurs sont de : Au 75 % Fe 24,4 % Ni 0,6 % In a second variant, the contents are: At 75% Fe 24.4% Or 0.6%

Il va de soi que l'invention s'étend également à un pré-alliage destiné à être synthétisé avec de l'or fin, pour obtenir la composition finale revendiquée.It goes without saying that the invention also extends to a pre-alloy intended to be synthesized with fine gold, in order to obtain the final composition claimed.

L'invention s'étend également à un procédé de traitement d'objets d'or fabriqués à partir de l'alliage revendiqué, caractérisé en ce que l'objet d'or est chauffé, dans un four porté à une température comprise entre 450 et 600°C, pendant une durée prédéterminée, sous atmosphère normale, puis refroidi à température ambiante après sortie du four pour obtenir un bleuissement de surface dû à l'oxydation des éléments non précieux contenus dans l'alliage.The invention also extends to a process for treating gold objects made from the claimed alloy, characterized in that the gold object is heated, in an oven brought to a temperature between 450 and 600 ° C, for a predetermined period, under a normal atmosphere, then cooled to room temperature after removal from the oven to obtain a surface bluing due to the oxidation of non-precious elements contained in the alloy.

La durée du traitement thermique dépend d'une part de facteurs extérieurs tels que degré d'humidité ou température ambiante et d'autre part de la grosseur des objets. Elle sera plus longue pour les grosses pièces (boîtes de montres ou bijoux par exemple) que pour les petites (éléments de bagues, de bracelets ou clips).The duration of the heat treatment depends on the one hand on external factors such as degree of humidity or ambient temperature and on the other hand on the size of the objects. It will be longer for large pieces (watch boxes or jewelry for example) than for small pieces (elements of rings, bracelets or clips).

La durée du traitement thermique dépend en outre de la température du four et est moindre lorsque la température du four est plus élevée.The duration of the heat treatment also depends on the temperature of the oven and is shorter when the temperature of the oven is higher.

Le bleuissement d'un objet réalisé avec la première variante d'alliage à 20 carats est plus prononcé que celui d'un objet réalisé avec la seconde variante d'alliage à 18 carats, qui tire sur le bleu-vert.The blueing of an object produced with the first variant of 20-carat alloy is more pronounced than that of an object produced with the second variant of 18-carat alloy, which tends to blue-green.

L'invention s'étend encore à l'utilisation en bijouterie d'un alliage caractérisée par l'assemblage de pièces ayant différentes colorations permettant d'obtenir un effet décoratif.The invention further extends to the use in jewelry of an alloy characterized by the assembly of parts having different colorings making it possible to obtain a decorative effect.

Comme mentionné précédemment, l'alliage destiné à être traité au four pour obtenir une coloration de surface peut être obtenu à partir d'un alliage primaire. Par exemple, en fondant 80 % d'or fin de 24 carats avec 20 % de pré-alliage, ce dernier doit présenter les teneurs en poids suivantes : Au 25 % Fe 72 % Ni 3 %
pour réaliser le premier alliage final préférentiel cité précédemment.As mentioned above, the alloy intended to be treated in the oven to obtain a surface coloring can be obtained from a primary alloy. For example, by melting 80% 24-carat fine gold with 20% pre-alloy, the latter must have the following weight contents: At 25% Fe 72% Or 3%
to make the first preferred final alloy mentioned above.

Si le poids de l'alliage primaire est de X % de l'alliage final obtenu par mélange de X % d'alliage primaire et de (100 - X) % d'or fin, on peut également écrire, dans l'exemple déjà cité d'alliage final contenant : Au 85 % (en poids) Fe 14,4 % Ni 0,6 %
que les composants de l'alliage primaire sont respectivement : Au [85 - (100-X)] x 100/X % Fe 14,4 x 100/X % Ni 0,6 x 100/X % If the weight of the primary alloy is X% of the final alloy obtained by mixing X% of the primary alloy and (100 - X)% of fine gold, we can also write, in the example already final alloy city containing: At 85% (by weight) Fe 14.4% Or 0.6%
that the components of the primary alloy are respectively: At [85 - (100-X)] x 100 / X% Fe 14.4 x 100 / X% Or 0.6 x 100 / X%

D'une manière plus générale, la composition de l'alliage primaire sera donnée par les formules : Au [(74,4 à 94,5) - (100-X)] x 100/X % Fe [5 à 25] x 100/X % Ni [0,5 à 0,6] x 100/X % More generally, the composition of the primary alloy will be given by the formulas: At [(74.4 to 94.5) - (100-X)] x 100 / X% Fe [5 to 25] x 100 / X% Or [0.5 to 0.6] x 100 / X%

L'alliage obtenu a un point de fusion de l'ordre de 1000° à 1100°. Les pièces réalisées peuvent être assemblées par brasage, en utilisant les alliages de brasure conventionnels, avec les ajouts habituels pour obtenir une gamme de brasures utilisables à des températures décroissantes à partir d'une température d'environ 100° inférieure à la température de fusion de l'alliage.The alloy obtained has a melting point of the order of 1000 ° to 1100 °. The parts produced can be assembled by brazing, using conventional brazing alloys, with the usual additions for obtain a range of solders usable at decreasing temperatures from a temperature of about 100 ° lower than the melting temperature of the alloy.

Claims (8)

  1. A gold alloy characterized in that it comprises the following elements: Au 74,4 to 94,5 % Fe 5 to 25 % Ni 0,5 to 0,6 %
    where the contents are the percentages of the weight with respect to the total weight of the alloy and in that the sum of said elements and impurities constitutes 100% of the total weight of the alloy.
  2. A gold alloy according to claim 1, characterized in that it comprises the following elements: Au 85 % Fe 14,4 % Ni 0,6 %
  3. A gold alloy according to claim 1, characterized in that it comprises the following elements: Au 75 % Fe 24,4 % Ni 0,6 %
  4. A gold alloy according to claim 1, characterized in that it comprises a mixing made of (100-X)% of pure gold with X % of a pre-alloy consisting of: Au [(74,4 to 94,5) - (100-X)] x 100/X % Fe [5 to 25] x 100/X % Ni [0,5 to 0,6] X 100/X %
  5. A method of treating objects of gold made from the gold alloy of the claims 1 to 4, characterized in that the gold object is heated, in a furnace having a temperature between 450 and 600°C, for a pre-determined period of time, under a normal atmosphere, and then cooled to ambient temperature after emergence from the furnace so as to obtain surface blueing resulting from oxydation of the non-precious elements contained in the alloy.
  6. A method of treating objects according to claim 5, characterized in that the duration of the treatment is a function of the size and/or the surface of the parts to be colored, of the temperature of the furnace, of the ambient temperature and of the degree of moisture.
  7. A method of treating objects according to claim 6, characterized in that the duration of the treatment is less when the temperature of the furnace is higher.
  8. The use in jewellery of an alloy according to claims 1 to 4, characterized by assembling parts having various colorations in order to obtain an aesthetical effect.
EP89810518A 1989-06-27 1989-07-10 Gold alloy Expired - Lifetime EP0405044B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2402/89 1989-06-27
CH2402/89A CH678949A5 (en) 1989-06-27 1989-06-27

Publications (2)

Publication Number Publication Date
EP0405044A1 EP0405044A1 (en) 1991-01-02
EP0405044B1 true EP0405044B1 (en) 1994-06-01

Family

ID=4232951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810518A Expired - Lifetime EP0405044B1 (en) 1989-06-27 1989-07-10 Gold alloy

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US (2) US5059255A (en)
EP (1) EP0405044B1 (en)
JP (1) JPH0331436A (en)
AT (1) ATE106458T1 (en)
CA (1) CA1335630C (en)
CH (1) CH678949A5 (en)
DE (1) DE68915753T2 (en)
ES (1) ES2055153T3 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW360716B (en) * 1993-02-19 1999-06-11 Citizen Watch Co Ltd Golden decorative part and process for producing the same
JP2807398B2 (en) * 1993-08-03 1998-10-08 和明 深道 Magnetoresistance effect material, method of manufacturing the same, and magnetoresistance element
US6071471A (en) * 1997-07-31 2000-06-06 Harry Winston Inc. Composition for jewelry
US20060086441A1 (en) * 2004-10-27 2006-04-27 University Of Cincinnati Particle reinforced noble metal matrix composite and method of making same
WO2006111178A1 (en) * 2005-04-19 2006-10-26 Ludwig Müller S.A. Precious metal alloy
CH697875B1 (en) * 2005-07-16 2009-03-13 Ludwig Mueller precious metal alloy.
US12077839B1 (en) 2023-07-26 2024-09-03 Chow Sang Sang Jewellery Company Limited Alloy with interference thin film and method for making the same

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US660983A (en) * 1899-05-24 1900-10-30 George M Pearce Art of hardening and tempering copper, gold, or silver.
US1580443A (en) * 1924-05-15 1926-04-13 Shields & Moore Gold alloy
DE896114C (en) * 1944-05-10 1953-11-09 Heraeus Gmbh W C Use of gold alloys for potentiometers
US2576738A (en) * 1949-04-21 1951-11-27 Metals & Controls Corp Gold alloys
FR1442528A (en) * 1965-05-07 1966-06-17 Chemical process for changing the color of legal jewelry gold alloy
DE2226267B2 (en) * 1972-05-30 1977-06-02 Pharmazeutische Fabrik Evers & Co, 2080 Pinneberg COMPLEX COMPOUND OF ASPARAGINATE, CER (III) AND ZINC IONS, PROCESS FOR THEIR PRODUCTION AND MEDICINAL PRODUCTS CONTAINING THESE
JPS575833A (en) * 1980-06-11 1982-01-12 Ishifuku Kinzoku Kogyo Kk Gold permanent magnet alloy
JPS59190340A (en) * 1983-04-12 1984-10-29 Citizen Watch Co Ltd Gold alloy for vapor phase plating
GB2184457B (en) * 1985-12-06 1989-03-30 Vittorio Antoniazzi Gold alloy

Also Published As

Publication number Publication date
CH678949A5 (en) 1991-11-29
CA1335630C (en) 1995-05-23
JPH05459B2 (en) 1993-01-06
DE68915753D1 (en) 1994-07-07
US5059255A (en) 1991-10-22
JPH0331436A (en) 1991-02-12
US5164026A (en) 1992-11-17
EP0405044A1 (en) 1991-01-02
DE68915753T2 (en) 1994-09-22
ES2055153T3 (en) 1994-08-16
ATE106458T1 (en) 1994-06-15

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