WO2007009472A1 - Precious metal alloy - Google Patents

Precious metal alloy Download PDF

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Publication number
WO2007009472A1
WO2007009472A1 PCT/EP2005/007780 EP2005007780W WO2007009472A1 WO 2007009472 A1 WO2007009472 A1 WO 2007009472A1 EP 2005007780 W EP2005007780 W EP 2005007780W WO 2007009472 A1 WO2007009472 A1 WO 2007009472A1
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WO
WIPO (PCT)
Prior art keywords
alloy
precious metal
oven
alloy according
temperature
Prior art date
Application number
PCT/EP2005/007780
Other languages
French (fr)
Inventor
Ludwig Müller
Original Assignee
Mueller Ludwig
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 Mueller Ludwig filed Critical Mueller Ludwig
Priority to CH02032/07A priority Critical patent/CH697875B1/en
Priority to PCT/EP2005/007780 priority patent/WO2007009472A1/en
Publication of WO2007009472A1 publication Critical patent/WO2007009472A1/en

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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
    • 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
    • C22C14/00—Alloys based on titanium
    • 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
    • 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
    • C22C5/04—Alloys based on a platinum group metal
    • 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
    • C22C5/06—Alloys based on silver

Definitions

  • the invention is in the field of metallurgy and more particularly relates to alloys of precious metals for use in particular in jewelery and watchmaking, the manufacture of coins and medals or objects of art.
  • jewelery and watchmaking the manufacture of coins and medals or objects of art.
  • gold having different colors, to obtain a decorative effect.
  • gold alloys one of whose components gives a predominant color to the whole.
  • copper is added to gold to obtain a red gold alloy or palladium to obtain a gray gold alloy.
  • a an alloy based on gold and iron which is distinguished by its blue color due to the oxidation of iron, as mentioned in European Patent No. 0405044.
  • the gold alloys described in the above patent usually contain a component, for example nickel intended on the one hand to obtain an alloy of a certain hardness and on the other hand to make a connection between the components of the alloy.
  • the object of the invention is to provide a precious metal alloy, especially a silver or platinum alloy, or palladium or titanium, to offer, after heat treatment, a color range of different colors ranging from yellow to very dark gray to brown, orange, red, purple, blue and gray.
  • the alloy according to the invention is characterized in that it comprises the following elements:
  • the contents are more precisely the following:
  • the precious metal involved in the combination of the alloy may be gold, silver, platinum, palladium, titanium or iridium. It is obvious that the alloy can be made from other precious metals, however, it is obvious that other precious metals are less interesting for obtaining special color effects in areas such as jewelery and the making of coins and medals or art objects.
  • the subject of the invention is also a process for treating objects made from the alloy according to the invention, characterized in that the object is heated in an oven heated to a temperature of between 350 and 900 ° C. a predetermined time, under a normal atmosphere, and then cooled to room temperature after leaving the oven to obtain a selected surface coloration due to the oxidation of the iron contained in the alloy and the predetermined duration of the treatment in the oven.
  • the duration of the treatment in the oven depends on the size of the surface of the parts to be colored, the oven temperature, the ambient temperature and the degree of humidity.
  • the duration of the treatment in the oven will be less when the temperature is higher.
  • the desired coloration will be chosen by the operator according to the duration of the treatment in the oven, the color passing through all successive grades ranging from yellow to brown, to orange, to red, to violet, to blue, to light gray and to anthracite gray.
  • the temperature of the oven will preferably be chosen in a range of 400 to 500 ° C. for the treatment of gold, silver or palladium.
  • the temperature of the oven will preferably be chosen between 800 and 900 ° C. for the treatment of platinum and titanium.
  • the invention finally relates to the use of the alloy according to the invention in jewelery, watchmaking, the manufacture of coins and medals, and the production of precious metal art objects.
  • the use of the alloy can be carried out to obtain objects composed of assembled parts having different colors in order to obtain a decorative effect.
  • the assembled parts will all be subjected to a separate heat treatment.
  • alloy embodiments will be given for different precious metals.
  • the baking temperatures of these alloys will also be indicated with the possibilities of obtaining coloring.
  • the most used precious metal used in the composition of the alloy is gold.
  • the gold alloy used will preferably be an alloy of 850/1000, which corresponds to a percentage of gold of 85% and a percentage of iron of 15%. Such an alloy will have sufficient hardness for use, for example, in jewelery and the connection between the elements of iron and gold will be satisfactory. The presence of other stabilizing elements such as nickel is therefore not necessary.
  • an alloy of 850/1000, and a temperature treatment between 400 and 500 0 C it will be possible to obtain a complete coloring range from yellow to brown, passing through orange, red, purple the blue, gray and anthracite color (very dark gray). The passage of these successive colors is a function of the duration of the treatment in the oven and the choice of the desired color is made by the user.
  • the density of the different colors mentioned above for example brown orange, red and blue represent very sustained colors and beautiful appearances.
  • the iron contained in the alloy gives in it the hardness necessary for the making of jewels, watches, coins, cutlery or any other pieces of precious metal art.
  • the precious metal used in the composition of the alloy may be silver or palladium.
  • an alloy of 850/1000 will give good result and the treatment in the oven will also be at a temperature between 400 and 500 0 C.
  • the precious metal used in the composition of the alloy may be platinum, iridium or titanium.
  • an alloy of 920/1000 to 950/1000 will preferably be chosen, which corresponds to a percentage of gold of 92 to 95% and to a corresponding percentage of iron of 5 to 8%.
  • platinum alloy of 920 to 950/1000 the precious metal can be laminated and worked without problem, unlike with platinum below 920/1000. At this rate, platinum can be cast and machined without problems. It may also be subjected to a heat treatment in a oven that will obtain a very beautiful red-violet, gray or light blue. With a platinum 850/1000, we will arrive at a beautiful purple color.
  • the treatment in the oven will be at a temperature of between 800 and 900 ° C.
  • the presence of iron is sufficient to give the alloy the hardness necessary for the manufacture of the pieces of jewelery and watchmaking for which it is intended, and this without it being necessary to add iridium, as c is usually used.
  • the presence of iron increases the hardness of platinum, which then becomes susceptible to be worked easily.
  • the most used precious metals for the manufacture of the alloy will be gold and platinum.
  • alloys of silver, palladium and titanium can also be validly used and can be used to achieve more special and less common objects such as glasses, pens, etc ...
  • the duration of the heat treatment depends partly on external factors such as degree of humidity or ambient temperature, and secondly on the size of the objects to be treated. It will obviously be longer for large pieces, watch cases or jewelry for example that for small (element of rings, bracelets or clips, coins, etc., ...)
  • the duration of the heat treatment also depends on the temperature of the oven and is lower when the temperature is higher.
  • the coloration chosen obviously depends on the duration of the objects placed in the oven, as well as the temperature of said oven.
  • the duration of passage of the room in the oven is chosen according to a review with the naked eye of the user. It is obvious that the coloration chosen depends on the skill and experience of the oven user. For example, in the case of a gold alloy, the blueing of an object made with a The first variation of a 20 carat gold alloy is more pronounced than that of an object made with the second 18-carat alloy variant, which will then draw on the green blue, while in the first case we will have a deep blue. .
  • the light blue color will be obtained with an oven temperature of 950 ° C., while a violet color will be obtained at 850 ° C.
  • the alloy which has just been described is particularly interesting in that it offers the possibility of obtaining a beautiful color sustained after a heat treatment. However, this characteristic is not unique and the alloy also offers the possibility of making parts with a hardness at least equal to or even greater than those obtained in the prior art with the addition of copper, iridium or nickel.
  • the alliance obtained according to the invention is interesting by its hardness qualities and its machining possibilities at least equal to or even greater than known alloys.
  • the manufacture of the alloy is very simple because it contains only the precious metal and iron, while it was usual to provide in the prior art complementary elements, such as iridium , nickel or palladium according to the desired purpose.
  • the color gamine may be obtained with the alloy which has just been described is particularly interesting.

Abstract

The inventive alloy comprises 75-95 % precious metals and 5-25 % Fe, wherein the contents thereof are expressed in percentage by weight with respect to the alloy total weight which is equal to the sum of said elements and impurities. The alloy is heat-processable in such a way that a colour between yellow and blue anthracite is obtained.

Description

Lϋdwig Millier, 1298 Céligny Lϋdwig Millier, 1298 Céligny
ALLIAGE DE MÉTAL PRÉCIEUXPRECIOUS METAL ALLOY
L' invention est du domaine de la métallurgie et concerne plus particulièrement des alliages de métaux précieux destiné à être utilisé notamment dans la joaillerie et l'horlogerie, la fabrication de monnaies et médailles ou d'objets d'art. Pour réaliser des bijoux et des pièces d'orfèvrerie ou des montres, il est connu d'utiliser de l'or ayant différentes colorations, permettant d'obtenir un effet décoratif.The invention is in the field of metallurgy and more particularly relates to alloys of precious metals for use in particular in jewelery and watchmaking, the manufacture of coins and medals or objects of art. To make jewels and pieces of goldsmithery or watches, it is known to use gold having different colors, to obtain a decorative effect.
A cet effet, on peut utiliser des alliages d'or dont 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. Il est également connu d'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 européen n° 0405044. Les alliages d'or décrits dans le brevet ci-dessus contiennent habituellement un composant, par exemple du nickel destiné d'une part à obtenir un alliage d'une certaine dureté et d' autre part à réaliser un lien entre les composants de l'alliage. Des essais réalisés sur plusieurs années ont amené le déposant à proposer un alliage qui ne soit pas limité à l'utilisation d'un seul métal précieux et qui permette d' obtenir des colorations de différentes couleurs selon le traitement appliqué au dit alliage. D'autre part, le déposant propose de simplifier la fabrication de l'alliage en éliminant des composants, comme le nickel, qui ne sont pas obligatoirement nécessaires au but recherché.For this purpose, it is possible to use gold alloys, one of whose components gives a predominant color to the whole. For example, copper is added to gold to obtain a red gold alloy or palladium to obtain a gray gold alloy. It is also known to use a an alloy based on gold and iron, which is distinguished by its blue color due to the oxidation of iron, as mentioned in European Patent No. 0405044. The gold alloys described in the above patent usually contain a component, for example nickel intended on the one hand to obtain an alloy of a certain hardness and on the other hand to make a connection between the components of the alloy. Tests carried out over several years have led the applicant to propose an alloy which is not limited to the use of a single precious metal and which makes it possible to obtain colorations of different colors according to the treatment applied to said alloy. On the other hand, the applicant proposes to simplify the manufacture of the alloy by eliminating components, such as nickel, which are not necessarily necessary for the purpose.
Le but de l'invention est de proposer un alliage de métal précieux, notamment un alliage d'argent ou de platine, ou encore de palladium ou de titane, permettant d'offrir, après traitement thermique, une gamme de coloration de différentes couleurs allant de la couleur jaune au gris très foncé en passant par le brun, l'orange, le rouge, le violet, le bleu et le gris. L'alliage selon l'invention est caractérisé en ce qu'il comprend les éléments suivants :The object of the invention is to provide a precious metal alloy, especially a silver or platinum alloy, or palladium or titanium, to offer, after heat treatment, a color range of different colors ranging from yellow to very dark gray to brown, orange, red, purple, blue and gray. The alloy according to the invention is characterized in that it comprises the following elements:
Métal précieux 75 à 95% Fe 5 à 25% où les teneurs sont exprimées en pourcentage de poids par rapport au poids total de l'alliage et où la somme desdits éléments et les impuretés constituent 100% du poids total de l'alliage.Precious metal 75 to 95% Fe 5 to 25% where the contents are expressed as a percentage of weight relative to the total weight of the alloy and where the sum of said elements and the impurities constitute 100% of the total weight of the alloy.
Dans une première forme d'exécution préférentielle, notamment pour des alliages d'or ou d'argent, les teneurs sont plus précisément les suivantes :In a first preferred embodiment, especially for gold or silver alloys, the contents are more precisely the following:
Métal précieux 75 à 85% Fe 15 à 25%Precious metal 75 to 85% Fe 15 to 25%
Selon une deuxième variante, notamment pour un alliage en platine on pourra avantageusement prévoir les teneurs suivantes :According to a second variant, in particular for a platinum alloy, the following contents may advantageously be provided:
Métal précieux 85 à 95% Fe 5 à 15%Precious metal 85 to 95% Fe 5 to 15%
Le métal précieux entrant dans la combinaison de l'alliage peut être de l'or, de l'argent, du platine, du palladium, du titane ou de l'iridium. Il est évident que l'alliage peut être réalisé à partir d'autre métaux précieux, cependant, il est évident que d'autres métaux précieux sont moins intéressants pour obtenir des effets de couleurs spéciaux dans des domaines tels que la joaillerie et la fabrication de monnaies et médailles ou d'objets d'art.The precious metal involved in the combination of the alloy may be gold, silver, platinum, palladium, titanium or iridium. It is obvious that the alloy can be made from other precious metals, however, it is obvious that other precious metals are less interesting for obtaining special color effects in areas such as jewelery and the making of coins and medals or art objects.
L'invention a également pour objet un procédé de traitement d'objets fabriqué à partir de l'alliage selon l'invention caractérisée en ce que l'objet est chauffé dans un four porté à une température comprise entre 350 et 9000C. pendant une durée prédéterminée, sous atmosphère normale, puis refroidi à la température ambiante après la sortie du four pour obtenir une coloration choisie de surface due à l'oxydation du fer contenu dans l'alliage et à la durée prédéterminée du traitement dans le four. Il est évident que la durée du traitement dans le four est fonction de la grandeur de la surface des pièces à colorer, de la température du four, de la température ambiante et du degré d'humidité.The subject of the invention is also a process for treating objects made from the alloy according to the invention, characterized in that the object is heated in an oven heated to a temperature of between 350 and 900 ° C. a predetermined time, under a normal atmosphere, and then cooled to room temperature after leaving the oven to obtain a selected surface coloration due to the oxidation of the iron contained in the alloy and the predetermined duration of the treatment in the oven. It is obvious that the duration of the treatment in the oven depends on the size of the surface of the parts to be colored, the oven temperature, the ambient temperature and the degree of humidity.
La durée du traitement dans le four sera moindre lorsque la température est plus élevée. La coloration désirée sera choisie par l'opérateur en fonction de la durée du traitement dans le four, la coloration passant par tous les grades successifs allant du jaune au brun, à l'orange, au rouge, au violet, au bleu, au gris clair et au gris anthracite.The duration of the treatment in the oven will be less when the temperature is higher. The desired coloration will be chosen by the operator according to the duration of the treatment in the oven, the color passing through all successive grades ranging from yellow to brown, to orange, to red, to violet, to blue, to light gray and to anthracite gray.
La température du four sera choisie de préférence dans une fourchette de 400 à 5000C. pour le traitement de l'or, de l'argent ou du palladium. La température du four sera choisie de préférence entre 800 et 9000C. pour le traitement du platine et du titane.The temperature of the oven will preferably be chosen in a range of 400 to 500 ° C. for the treatment of gold, silver or palladium. The temperature of the oven will preferably be chosen between 800 and 900 ° C. for the treatment of platinum and titanium.
L'invention à finalement pour objet l'utilisation de l'alliage selon l'invention dans la bijouterie, l'horlogerie, la fabrication de monnaies et de médailles, et la réalisation d'objets d'art en métal précieux.The invention finally relates to the use of the alloy according to the invention in jewelery, watchmaking, the manufacture of coins and medals, and the production of precious metal art objects.
L'utilisation de l'alliage peut être réalisée pour l'obtention d'objets composés de pièces assemblées présentant différentes colorations dans le but d' obtenir un effet décoratif. Dans ce cas, les pièces assemblées feront toutes l'objet d'un traitement thermique séparé.The use of the alloy can be carried out to obtain objects composed of assembled parts having different colors in order to obtain a decorative effect. In this case, the assembled parts will all be subjected to a separate heat treatment.
Dans la description qui va suivre, des modes de réalisation d'alliage seront données pour différents métaux précieux. Les températures de traitement au four de ces alliages seront également indiquées avec les possibilités d'obtention de coloration.In the following description, alloy embodiments will be given for different precious metals. The baking temperatures of these alloys will also be indicated with the possibilities of obtaining coloring.
Le métal précieux le plus utilisé entrant dans la composition de l'alliage est l'or. L'alliage d'or utilisé sera de préférence un alliage de 850/1000, ce qui correspond à un pourcentage d'or de 85% et un pourcentage de fer de 15%. Un tel alliage aura une dureté suffisante pour une utilisation par exemple en joaillerie et la liaison entre les éléments de fer et d' or sera satisfaisante. La présence d'autres éléments stabilisateurs tels que le nickel n'est par conséquent pas nécessaire. Avec un alliage de 850/1000, et un traitement de température entre 400 et 5000C, il sera possible d'obtenir une gamme de coloration complète allant du jaune au brun, en passant par l'orange, le rouge, le violet le bleu, le gris et la couleur anthracite (gris très foncé) . Le passage de ces couleurs successives est fonction de la durée du traitement dans le four et le choix de la couleur désirée se fait à l'œil par l'utilisateur. La densité des différentes couleurs mentionnées ci-dessus par exemple le brun l'orange, le rouge et le bleu représentent des couleurs très soutenues et de belles apparences. Comme mentionné plus haut il n'est pas nécessaire d'ajouter du nickel ou du cuivre pour obtenir une dureté suffisante de l'alliage dans le cas d'une utilisation en joaillerie. Le fer contenu dans l'alliage donne dans celui-ci la dureté nécessaire à la confection de bijoux, de montres, de monnaies, de couverts ou de tout autres pièces d'art en métal précieux.The most used precious metal used in the composition of the alloy is gold. The gold alloy used will preferably be an alloy of 850/1000, which corresponds to a percentage of gold of 85% and a percentage of iron of 15%. Such an alloy will have sufficient hardness for use, for example, in jewelery and the connection between the elements of iron and gold will be satisfactory. The presence of other stabilizing elements such as nickel is therefore not necessary. With an alloy of 850/1000, and a temperature treatment between 400 and 500 0 C, it will be possible to obtain a complete coloring range from yellow to brown, passing through orange, red, purple the blue, gray and anthracite color (very dark gray). The passage of these successive colors is a function of the duration of the treatment in the oven and the choice of the desired color is made by the user. The density of the different colors mentioned above for example brown orange, red and blue represent very sustained colors and beautiful appearances. As mentioned above it is not necessary to add nickel or copper to obtain sufficient hardness of the alloy in the case of use in jewelry. The iron contained in the alloy gives in it the hardness necessary for the making of jewels, watches, coins, cutlery or any other pieces of precious metal art.
Le métal précieux entrant dans la composition de l'alliage peut être de l'argent ou du palladium. Dans ce cas, un alliage de 850/1000 donnera de bon résultat et le traitement dans le four se fera également à une température située entre 400 et 5000C.The precious metal used in the composition of the alloy may be silver or palladium. In this case, an alloy of 850/1000 will give good result and the treatment in the oven will also be at a temperature between 400 and 500 0 C.
Le métal précieux entrant dans la composition de l'alliage peut être du platine, de l'iridium ou du titane. Dans le cas du platine, on choisira de préférence un alliage de 920/1000 à 950/1000, ce qui correspond à un pourcentage d'or de 92 à 95% et à un pourcentage de fer correspondant de 5 à 8%. Avec un alliage de platine de 920 à 950/1000, le métal précieux pourra être laminé et travaillé sans problème contrairement avec ce qui se passe avec du platine en dessous de 920/1000. A ce taux, le platine pourra être coulé et usiné sans problème. Il pourra également être soumis à un traitement de chaleur dans un four qui permettra d' obtenir une très belle coloration rouge-violette, grise ou bleue clair. Avec un platine à 850/1000, on arrivera à une très belle couleur violette. Dans le cas du platine, de même que pour l'iridium et le titane le traitement dans le four se fera à une température située entre 800 et 9000C. Dans le cas d'un alliage de platine, de palladium ou de titane, la présence du fer est suffisante pour donner à l'alliage la dureté nécessaire à la confection des pièces de joaillerie et d'horlogerie pour lesquelles il est destiné, et ceci sans qu'il soit nécessaire d'ajouter de l'iridium, comme c'est l'usage habituellement. Finalement, la présence du fer permet d'augmenter la dureté du platine, qui devient alors susceptible d'être travaillé facilement. Comment mentionné plus haut, les métaux précieux les plus utilisés pour la fabrication de l'alliage seront l'or et le platine. Toutefois, les alliages d'argent, de palladium et de titane peuvent également être valablement utilisés et pourront servir à réaliser des objets plus spéciaux et moins courants comme les lunettes, stylos, etc... Le procédé de traitement d'objets fabriqués à partir des alliages qui viennent d' être décrits et caractérisé en ce que l'objet est chauffé dans un four porté à une température comprise entre 350 et 9000C. pendant une durée prédéterminée, sous atmosphère normale, puis refroidi à la température ambiante à la sortie du four pour obtenir une coloration choisie de surface due à l'oxydation du fer contenu dans l'alliage et à la durée prédéterminée de traitement dans le four.The precious metal used in the composition of the alloy may be platinum, iridium or titanium. In the case of platinum, an alloy of 920/1000 to 950/1000 will preferably be chosen, which corresponds to a percentage of gold of 92 to 95% and to a corresponding percentage of iron of 5 to 8%. With a platinum alloy of 920 to 950/1000, the precious metal can be laminated and worked without problem, unlike with platinum below 920/1000. At this rate, platinum can be cast and machined without problems. It may also be subjected to a heat treatment in a oven that will obtain a very beautiful red-violet, gray or light blue. With a platinum 850/1000, we will arrive at a beautiful purple color. In the case of platinum, as well as for iridium and titanium, the treatment in the oven will be at a temperature of between 800 and 900 ° C. In the case of a platinum, palladium or titanium alloy, the presence of iron is sufficient to give the alloy the hardness necessary for the manufacture of the pieces of jewelery and watchmaking for which it is intended, and this without it being necessary to add iridium, as c is usually used. Finally, the presence of iron increases the hardness of platinum, which then becomes susceptible to be worked easily. As mentioned above, the most used precious metals for the manufacture of the alloy will be gold and platinum. However, alloys of silver, palladium and titanium can also be validly used and can be used to achieve more special and less common objects such as glasses, pens, etc ... The process of processing objects made from alloys which have just been described and characterized in that the object is heated in an oven heated to a temperature of between 350 and 900 ° C. for a predetermined time, under a normal atmosphere, then cooled to room temperature at the furnace outlet to obtain a chosen surface coloration due to the oxidation of the iron contained in the alloy and to the predetermined duration of treatment in the oven.
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 à traiter. Elle sera évidemment plus longue pour les grosses pièces, boites de montre ou bijoux par exemple que pour les petites (élément de bagues, de bracelets ou clips, pièces de monnaies, etc, ... )The duration of the heat treatment depends partly on external factors such as degree of humidity or ambient temperature, and secondly on the size of the objects to be treated. It will obviously be longer for large pieces, watch cases or jewelry for example that for small (element of rings, bracelets or clips, coins, etc., ...)
La durée du traitement thermique dépend en outre de la température du four et est moindre lorsque la température est plus élevée. La coloration choisie dépend évidemment de la durée des objets placés dans le four, de même que la température dudit four. La durée de passage de la pièce dans le four est choisie en fonction d'un examen à l'œil nu de l'utilisateur. Il est évident que la coloration choisie dépend de l'habileté et de l'expérience de l'utilisateur du four. Par exemple, dans le cas d'un alliage d'or, le bleuissement d'un objet réalisé avec une première variante d'alliage d'or à 20 carat est plus prononcé que celui d'un objet réalisé avec la seconde variante d'alliage à 18 carat qui tirera alors sur le bleu vert, alors que dans le premier cas on aura un bleu soutenu. Dans le cas d'un alliage de platine, la couleur bleue clair sera obtenue avec une température de four de 9500C. alors qu'on arrivera à une couleur violette à 8500C. L'alliage qui vient d'être décrit est particulièrement intéressant par le fait qu'il offre la possibilité d'obtenir une belle couleur soutenue après un traitement thermique. Cependant cette caractéristique n'est pas unique et l'alliage offre de plus la possibilité de réaliser des pièces d'une dureté au moins égale voire supérieure à celles obtenues dans l'art antérieur avec adjonction de cuivre, d'iridium ou de nickel. L'alliance obtenue selon l'invention est intéressante par ses qualités de dureté et ses possibilités d'usinage au moins égales, voire supérieures aux alliages connus. Finalement, la fabrication de l'alliage est d'une très grande simplicité, car il ne contient que le métal précieux et du fer, alors qu'il était usuel de prévoir dans l'art antérieur des éléments complémentaires, tel que l'iridium, le nickel ou le palladium suivant le but recherché. Finalement la gamine de couleurs susceptible d'être obtenue avec l'alliage qui vient d'être décrit est particulièrement intéressante. The duration of the heat treatment also depends on the temperature of the oven and is lower when the temperature is higher. The coloration chosen obviously depends on the duration of the objects placed in the oven, as well as the temperature of said oven. The duration of passage of the room in the oven is chosen according to a review with the naked eye of the user. It is obvious that the coloration chosen depends on the skill and experience of the oven user. For example, in the case of a gold alloy, the blueing of an object made with a The first variation of a 20 carat gold alloy is more pronounced than that of an object made with the second 18-carat alloy variant, which will then draw on the green blue, while in the first case we will have a deep blue. . In the case of a platinum alloy, the light blue color will be obtained with an oven temperature of 950 ° C., while a violet color will be obtained at 850 ° C. The alloy which has just been described is particularly interesting in that it offers the possibility of obtaining a beautiful color sustained after a heat treatment. However, this characteristic is not unique and the alloy also offers the possibility of making parts with a hardness at least equal to or even greater than those obtained in the prior art with the addition of copper, iridium or nickel. The alliance obtained according to the invention is interesting by its hardness qualities and its machining possibilities at least equal to or even greater than known alloys. Finally, the manufacture of the alloy is very simple because it contains only the precious metal and iron, while it was usual to provide in the prior art complementary elements, such as iridium , nickel or palladium according to the desired purpose. Finally the color gamine may be obtained with the alloy which has just been described is particularly interesting.

Claims

REVENDICATIONS
1. Alliage de métal précieux caractérisé en ce qu'il comprend les éléments suivants :1. Alloy of precious metal characterized in that it comprises the following elements:
Métal précieux 75 à 95% Fe 5 à 25%Precious metal 75 to 95% Fe 5 to 25%
où les teneurs sont exprimées en pourcentages 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.where the contents are expressed in percentages by weight relative to the total weight of the alloy and wherein the sum of said elements and impurities constitutes 100% of the total weight of the alloy.
2. Alliage selon la revendication 1, caractérisé en ce qu'il comprend les éléments suivants : Métal précieux 85%2. Alloy according to claim 1, characterized in that it comprises the following elements: Precious metal 85%
Fe 15 %Fe 15%
3. Alliage selon la revendication 1, caractérisé en ce qu'il comprend les éléments suivants :3. Alloy according to claim 1, characterized in that it comprises the following elements:
Métal précieux 85 à 95% Fe 5 à 15%Precious metal 85 to 95% Fe 5 to 15%
4. Alliage selon la revendication 1, caractérisé en ce qu'il comprend les mélanges suivants :4. An alloy according to claim 1, characterized in that it comprises the following mixtures:
Métal précieux 75% Fe 25%Precious metal 75% Fe 25%
5. Alliage selon une des revendications 1 à 4 caractérisé en ce que le métal précieux est de l'or.5. Alloy according to one of claims 1 to 4 characterized in that the precious metal is gold.
6. Alliage selon une des revendications 1 à 4 caractérisé en ce que le métal précieux est de l'argent.6. Alloy according to one of claims 1 to 4 characterized in that the precious metal is silver.
7. Alliage selon une des revendications 1 à 4, caractérisé en ce que le métal précieux est du platine.7. Alloy according to one of claims 1 to 4, characterized in that the precious metal is platinum.
8. Alliage selon une des revendications 1 à 4, caractérisé en ce que le métal précieux est du palladium. 8. Alloy according to one of claims 1 to 4, characterized in that the precious metal is palladium.
9. Alliage selon une des revendications 1 à 4, caractérisé en ce que le métal précieux est de l'iridium.9. Alloy according to one of claims 1 to 4, characterized in that the precious metal is iridium.
10. Alliage selon une des revendications 1 à 4, caractérisé en ce que le métal précieux est du titane.10. Alloy according to one of claims 1 to 4, characterized in that the precious metal is titanium.
11. Procédé de traitement d'objets fabriqués à partir de l'alliage selon une des revendications 1 à 10, caractérisé en ce que l'objet est chauffé dans un four porté à une température comprise entre 350 et 9000C. pendant une durée prédéterminée, sous atmosphère normale, puis refroidi à la température ambiante après la sortie du four pour obtenir une coloration choisie de surface due à l'oxydation du fer contenu dans l'alliage et à la durée prédéterminée de traitement dans le four.11. Process for treating objects made from the alloy according to one of claims 1 to 10, characterized in that the object is heated in an oven heated to a temperature between 350 and 900 0 C. for a period predetermined, under a normal atmosphere, and then cooled to room temperature after leaving the oven to obtain a selected surface coloration due to the oxidation of the iron contained in the alloy and the predetermined duration of treatment in the oven.
12. Procédé de traitement d'objets selon la revendication 9, caractérisé en ce que la durée du traitement dans le four est fonction de la grandeur et/ou de la surface des pièces à colorer, de la température du four, de la température ambiante et du degré d'humidité.12. Object processing method according to claim 9, characterized in that the duration of the treatment in the oven is a function of the size and / or the surface of the pieces to be colored, the oven temperature, the ambient temperature and the degree of humidity.
13. Procédé de traitement d'objets selon la revendication 10, caractérisé en ce que la durée du traitement dans le four est moindre lorsque la température est plus élevée.13. Object processing method according to claim 10, characterized in that the duration of the treatment in the oven is lower when the temperature is higher.
14. Procédé de traitement d'objets selon la revendication 10, caractérisé en ce que la coloration est choisie par l'opérateur en fonction de la durée du traitement dans le four, la coloration passant par les stades successifs allant du jaune au brun, orange, rouge, violet, bleu et gris .Method for treating objects according to claim 10, characterized in that the coloration is chosen by the operator depending on the duration of the treatment in the oven, the color passing through the successive stages ranging from yellow to brown, orange, red, purple, blue and gray.
15. Procédé selon la revendication 1, caractérisé en ce que la température du four est choisie de préférence à 400 à15. Process according to claim 1, characterized in that the temperature of the oven is preferably chosen to be 400 to
5000C, pour le traitement de l'or, de l'argent ou du palladium.500 0 C, for the treatment of gold, silver or palladium.
16. Procédé selon la revendication 1, caractérisé en ce que la température du four est choisie de préférence à 800 à 9000C. pour le traitement du platine et du titane.16. Process according to Claim 1, characterized in that the temperature of the oven is preferably chosen at 800 to 900 ° C. for the treatment of platinum and titanium.
17. Utilisation de l'alliage selon une des revendications 1 à 9 dans la bijouterie, l'horlogerie, la fabrication de monnaies et de médailles et la réalisation d'objets d'art, lunetterie en métal précieux. 17. Use of the alloy according to one of claims 1 to 9 in the jewelery, watchmaking, the manufacture of coins and medals and the production of works of art, eyewear of precious metal.
18. Utilisation selon la revendication 16, pour l'obtention d'objets composés de pièces assemblées présentant différentes colorations dans le but d' obtenir un effet décoratif, notamment pour des mouvements de montres. 18. Use according to claim 16, for obtaining objects composed of assembled parts having different colors for the purpose of obtaining a decorative effect, especially for watch movements.
PCT/EP2005/007780 2005-07-16 2005-07-16 Precious metal alloy WO2007009472A1 (en)

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