EP2588635B1 - Goldlegierungen mit verbesserten härte - Google Patents

Goldlegierungen mit verbesserten härte Download PDF

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Publication number
EP2588635B1
EP2588635B1 EP11725466.4A EP11725466A EP2588635B1 EP 2588635 B1 EP2588635 B1 EP 2588635B1 EP 11725466 A EP11725466 A EP 11725466A EP 2588635 B1 EP2588635 B1 EP 2588635B1
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Prior art keywords
gold
metal
precipitate
alloy
aluminium
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English (en)
French (fr)
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EP2588635A2 (de
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Jean-François DIONNE
Stewes Bourban
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Swatch Group Research and Development SA
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Swatch Group Research and Development SA
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    • 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
    • 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

Definitions

  • the invention relates to a gold-based alloy, known as 18K yellow gold type 3N, having improved hardness.
  • the invention also relates to a process for obtaining a gold-based alloy with improved hardness.
  • the invention further relates to the use of a precipitate for hardening a gold alloy.
  • the invention also relates to a timepiece, jewelery or jewelery comprising at least one component made of such an alloy.
  • the main applications are watchmaking, jewelery, jewelery and dentistry.
  • the hardening of gold is an old problem, which, since antiquity, has led to the use of alloys in order to obtain sufficient mechanical characteristics to ensure at least the holding of the manufactured objects. Indeed, the process of hardening by plastic deformation of the material, which applies well to certain metals, applies poorly to gold since it has only very little consolidation during deformation, and more, recrystallizes at relatively low temperatures.
  • the method of refining the grain size theoretically allowing to increase the elastic limit of the material, is not suitable either for gold, which has a cubic face-centered structure, hereinafter referred to as CFC, since there are enough active sliding systems for the free passage of dislocations from one grain to another.
  • the dissolution of alloying elements is the most commonly used method, often empirically, and provides only poor hardness, of the order of 150 to 155 HV on the Vickers scale in the best case .
  • a patent EP 0 978 572 in the name of Hafner GmbH describes an alloy consisting of 70% to 80% gold, 15% to 25% copper, 0% to 15% silver, and 0.1% to 5% gallium, which, unexplained, oxidizes little during a second treatment at 400 ° C following a first treatment at 800 ° C, and acquires a hardness that increases with time at room temperature.
  • EP 0 978 572 A1 in the name of HAFNER describes an alloy with 70 to 80% gold and 15 to 25% copper, to which is added 0.1 to 5% gallium. According to certain variants it could still contain: 0.1 to 3% of zinc, and / or 0.5 to 5% of silver, and / or 0.1 to 0.5% of silicon, and / or of 0 , 1 to 2% iron and / or 0.1 to 0.3% indium, and / or 0.1 to 0.5% aluminum and / or 0.1 to 3% tin.
  • said addition metal is silver, and the ratio between the aluminum mass on the one hand, and the total mass of gold, silver and silver on the other hand. of aluminum, is less than 0.03.
  • an addition metal is silver in a mass content of 10% to 12.5% of the total, and is supplemented by another addition metal of concentration lower than that money in a mass content of 10% to 12.5% of the total.
  • said other addition metal is copper.
  • the selection of said at least one selected precipitate is restricted to a single precipitate which is the Al 2 Au 5 aluminum and gold precipitate.
  • said structuring income is made at least 24 hours after said sudden cooling.
  • the silver is chosen for the said at least one additive metal.
  • silver is chosen for said addition metal, and another addition metal of concentration lower than that of silver is added thereto.
  • copper is chosen for the said other additive metal.
  • the invention also relates to the use of a precipitate for hardening an 18-carat gold alloy with a hardness greater than 250 HV, characterized in that said precipitate is a precipitate of aluminum and gold Al 2 to 5 and is formed in the form of an intermetallic to improve the structural hardening of said alloy, and characterized in that said precipitate is a precipitate of aluminum and gold Al 2 Au 5 for curing an alloy of gold containing at least 75% gold, from 0.5% to 2.1% aluminum, and from 20% to 25% of at least one addition metal selected from silver and copper and chosen for its ability to favor a stable cubic face-centered CFC structure on the one hand, and for its ability to increase the solubility of aluminum in gold on the other hand, and from 0% to 0.5% of one or more components selected for the fluidity and refinement of the grain size of said gold alloy, said use resulting from the insert ion of said precipitate of aluminum and gold Al 2 Au 5 , in a face-centered cubic CFC structure resulting from the dissolution of said mixture consisting of gold
  • the invention also relates to a timepiece, jewelery, jewelery or dentistry comprising at least one component made of such a gold alloy with improved hardness, or obtained by this method.
  • the alloy retains the specific appearance of pure gold.
  • This alloy obtained, by its improved hardness, is more resistant to scratches, and is entirely appropriate for timepieces, jewelery or jewelery, and in particular for their visible components such as glasses and watch frames, and jewelry structures, bracelets, clasps, buckles, and other items.
  • the invention provides a simple, reproducible method of implementation which makes it possible to obtain with certainty a gold alloy with a required hardness, greater than 250 HV, with a low treatment time.
  • the alloy obtained is directly usable without requiring additional aging.
  • the invention uses a method of structural hardening, by the selection of particular elements, which are here chosen to form particular precipitates.
  • particular elements which are here chosen to form particular precipitates.
  • various precipitates that can form gold with other metals under very specific physico-chemical conditions, it is a question of choosing those which can be controlled, by the implementation of an appropriate treatment, the germination and growth, to optimize the mechanical characteristics, and in particular here to improve the hardness.
  • the mechanical characteristic that the present invention makes it possible to improve, by the creation of a particular process is the hardness, which concerns both the core hardness of the alloy, and the surface hardness which is very important in watches, jewelery, jewelery to resist scratches or at least to minimize the effects.
  • the inventive step of the invention was to search for the possibility of insertion, in a cubic face-centered or CFC structure, of precipitates, and to grow them in a controlled manner, so as to obtain a hardness greater than the usual hardness. .
  • the invention relates more particularly to the field of gold alloys with a high gold content, and particularly 18-carat alloys, comprising at least 75% of their weight of gold.
  • Al 2 Au 5 precipitate which provides, embedded in an alloy, a normal behavior during machining or processing operations. It is thus necessary to obtain the creation of this Al 2 Au 5 precipitate, and preferably to obtain the creation of this Al 2 Au 5 precipitate alone, since it confers better properties on the alloy than the two. other precipitates AlAu 2 and AlAu.
  • This precipitate Al 2 Au 5 must be obtained within a CFC structure.
  • a binary alloy composed solely of gold and aluminum is inconvenient to develop, and is very fragile, making it unsuitable for most jewelery and jewelery jobs. It is therefore necessary to stabilize the CFC phase by the incorporation of at least one other alloying element making it possible to ensure the intermetallic solubility at high temperature, and also to ensure the longest possible CFC phase; for a range of aluminum content as wide as possible.
  • High temperature stability means that only the CFC phase (or FCC according to the English name on the figure 1 ) is present in the considered temperature range, which can be seen in the long elongated range of the equilibrium diagram of the figure 1 .
  • the second metal may be selected from aluminum, silver, chromium, copper, iron, hafnium, manganese, niobium, palladium, platinum, vanadium, this list is not exhaustive.
  • An addition metal can be chosen preferably from silver, aluminum, chromium, copper, iron, hafnium, manganese, niobium, palladium, platinum, vanadium.
  • the invention has sought to create the phase diagram of the pseudo-binary alloy Au-Ag-Al, as visible on the figure 1 .
  • This diagram represents, in a conventional way, the different phases, as a function, on the one hand, of the abscissa of the aluminum concentration, that is to say on the ratio between the aluminum mass and the total mass of the alloy, and on the other hand on the ordinate of the temperature, here represented in degrees Celsius.
  • the diagram of the figure 1 represents the preferred case of a concentration in gold mass of 75%, the preferred case of an 18-carat alloy.
  • a on figure 1 a first field called A on figure 1 , in which only the elements of the alloy in CFC form coexist on the one hand, and the precipitates of Al 2 Au 5 on the other hand.
  • the concentration of aluminum, to remain in this area, must remain below 2.1%.
  • the range of concentrations to be respected is 0.1% to 2.1% of aluminum in order to be certain to develop only Al 2 Au 5 .
  • a second domain called B on the figure 1 corresponds to a phase where the Al 2 Au 5 and AlAu 2 precipitates coexist with the elements of the alloy in CFC form.
  • the third domain called C on the figure 1 corresponds to a phase where only the precipitates of AlAu 2 coexist with the elements of the alloy in CFC form.
  • the diagram of the figure 1 shows that, to obtain an alloy in an optimal composition in the domain A, a method of obtaining is to heat up all the elements of the alloy, then to be in the domain D of the figure 1 , corresponding to a dissolution of aluminum.
  • a dilution heat treatment at a temperature between the solidus and the liquidus delimiting the D domain, allows homogeneous dissolution: the gold is in CFC structure, thanks to the chosen element or addition elements, in particular the silver, and the CFC structure is stable.
  • High solubility of aluminum in the CFC_A1 phase is observed at high temperature, in particular at temperatures between 400 ° C. and 700 ° C. This or these addition elements also facilitate the solubility of aluminum in gold.
  • the alloy is then made metastable.
  • the rise in temperature carried out for example between about 400 ° C. and 700 ° C. for the end portion of area A, ideally around 650 ° C., is followed by rapid cooling, such as water quenching. , or similar.
  • rapid cooling such as water quenching. , or similar.
  • aluminum atoms do not have time to reorganize.
  • the alloy is subjected to structuring income treatment, in the temperature range defined by the solvus of the A domain for the aluminum concentration considered. In any case, this structuring income does not exceed the temperature of 400 ° C.
  • the structuring tempering temperature is greater than 200 ° C to facilitate this growth of the precipitates, and also limit the duration of the heat treatment.
  • the figure 2 is a Vickers hardness chart in ordinate as a function of time on the abscissa.
  • a structuring income at 200 ° C a hardness greater than 250 HV is obtained very quickly, after about 2 hours. This hardness will still increase if the structuring income treatment is prolonged, but asymptotically, and it is hardly useful, even if the maximum hardness is sought, to prolong the treatment beyond ten or so years. hours, where one reaches a hardness of the order of 280 HV.
  • the figure 2 shows, for comparison, the hardness level of 150 HV obtained with an 18 K gold or 18 K gold alloy, conventional.
  • the structuring income is made at a lower temperature, for example 100 ° C, a hardness greater than 200 HV will be obtained after 10 to 15 hours, and the treatment must be further extended to reach a level of order of 250 HV.
  • the precipitate Al 2 Au 5 obtained is harder than gold.
  • the alloy contains no other metal than gold, aluminum, and an addition metal, preferably silver, chosen to increase intermetallic solubility and to maximize phase D, in terms of range amplitude of aluminum concentrations.
  • Document D4 describes a yellow gold pulling towards the rose. It is impossible to highlight the specific role of aluminum since all the other elements present in the alloy already contribute to hardening. This document notes that beyond 0.4% of aluminum the alloy darkens considerably. This disadvantage is not visible in the case of the alloy produced according to the invention, even at a content of 2% of aluminum. It should be noted that the experimenter who follows the instructions of this document D4 will not get a precipitate Al 2 Au 5 , because, on the one hand added elements such as zinc which modify the solubility of aluminum, and on the other hand the low concentration> 0.4% of aluminum.
  • Document D5 explains the hardening of the gold (75%) - silver-copper alloy by the order / disorder transformation well known with copper.
  • the 75% gold-12.5% silver -12.5% copper composition of FIG. 7.12 of document D5 gives a hardness of 220 HV, which is much lower than that obtained by the invention.
  • the manufacture of the Al 2 Au 5 aluminum and gold precipitate makes it possible to increase the HV hardness by about 50 HV.
  • the invention differs from the prior art in that it creates the conditions for the development of Al 2 Au 5 precipitates, in an alloy of suitable composition comprising gold, aluminum, and at least one addition metal selected for its ability to promote a stable CFC structure on the one hand, and to increase the solubility of aluminum in gold on the other hand, this addition metal being preferably 'money.
  • the optimum composition in mass is from 0.5% to 2.1% of aluminum, and at least 75% of gold in order to respect the legal requirement in jewelery and jewels, and the complement consisting of at least one metal of addition, which may be supplemented by a small proportion of at least one other selected component for the fluidity and refinement of the grain size.
  • the addition metal can also be copper. It is also possible to combine several metals each having the properties that this adduct must have, namely the ability to promote a stable CFC structure on the one hand, and the ability to increase the solubility of the aluminum in gold on the other hand.
  • Silver is the best element, and the other metallic elements listed above can be added to adjust the tint of the alloy. This list of elements has been drawn up so that the elements contained therein satisfy the condition of increasing the solubility of aluminum in the high temperature CFC structure.
  • copper is less favorable than silver for fulfilling these particular functions in the presence of gold and aluminum.
  • the use of copper is still possible for reasons of cost, but is much less favorable than silver, and should always, in case of employment, be combined with money, paying attention that the concentration of money always be greater than the concentration of copper in the alloy.
  • addition metals for example selected from chromium, copper, iron, hafnium, manganese, niobium, palladium, platinum, vanadium since this list is not exhaustive, it should be borne in mind that aluminum could form precipitates with some of these addition metals, but it is preferable to form Al 2 Au 5 precipitates. So, in addition to silver and aluminum, it is preferable to use these elements alone: chromium, copper, iron, hafnium, manganese, niobium, palladium, platinum, vanadium
  • each new composition with different addition metals requires a complete experiment in order to define the corresponding phase diagrams, nonexistent in the literature, to analyze the precipitates and other intermetallics created within each of the phases, to verify that these compounds do not alter the mechanical properties of the gold-based alloy.
  • These studies and experiments are long and expensive and can not be conducted at random. They are also intended to determine, on a case by case basis, the range of aluminum concentrations to be observed in order to obtain Al 2 Au 5 precipitates, and preferably only this one.
  • the second metal is aluminum and the precipitate selected is the Al 2 Au 5 aluminum and gold precipitate, which makes it possible to obtain an alloy with very good hardness characteristics, which is greater than 250 HV, and in particular in the vicinity of 280 HV.
  • This Al 2 Au 5 precipitate also provides the alloy with good resistance during its transformation or its machining, because it does not make the alloy brittle.
  • the addition metal is silver, which ensures good dissolution of the entire mixture.
  • the addition metal is silver, preferably in a mass content of from 10% to 12.5% of the total, and is supplemented with another metal of addition, preferably in a in mass from 10% to 12.5% of the total, to adjust the shade of the alloy.
  • At least one said selected component for the fluidity and refinement of the grain size of said alloy is selected from zinc, cobalt or iridium.
  • the selection of selected precipitates is restricted to a single precipitate, in this case the Al 2 Au 5 aluminum and gold precipitate.
  • the structuring income is made at least 24 hours after the quenching.
  • Aluminum is preferably chosen for the second metal, and the precipitate of Al 2 Au 5 aluminum and gold is selected as the selected precipitate.
  • the addition metal is silver.
  • silver is used as the addition metal and another addition metal with silver-like characteristics is added to adjust the color of the alloy.
  • the invention further relates to the use of a precipitate for hardening a gold alloy.
  • this precipitate is a precipitate of aluminum and gold Al 2 Au 5 for the hardening of a gold alloy comprising at least 75% gold, from 0.5% to 2.1% d aluminum, and from 22.4% to 24.5%, of at least one addition metal selected from silver and copper and selected for its ability to promote a CFC-centered cubic structure stable on the one hand , and for its ability to increase the solubility of aluminum in gold on the other hand, and from 0% to 0.5% of one or more selected components for the fluidity and refinement of grain size said gold alloy, said use resulting from the insertion of said precipitate of aluminum and gold Al 2 Au 5 , into a structure cubic face-centered CFC resulting from the dissolution of said mixture consisting of gold, aluminum, said at least one addition metal, said selected components if said alloy contains, and aluminum precipitates with gold, said insertion being preferably achievable by the method described above.
  • the invention also relates to a timepiece, jewelery, jewelery or dentistry comprising at least one component made of such an alloy.

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Claims (19)

  1. Legierung auf Basis von Gold, so genanntem Gelbgold mit 18 Karat vom Typ 3N, dadurch gekennzeichnet, dass sie aus einem Gemisch gebildet ist, die in Masseanteilen umfasst:
    - wenigstens 75 % Gold,
    - von 0,5 % bis 2,1 % eines zweiten Metalls, das wegen seiner Eignung, mit Gold Niederschläge zu bilden, gewählt ist, wobei dieses zweite Metall Aluminium ist;
    - von 22,4 % bis 24,5 % wenigstens eines Zusatzmetalls, das einerseits wegen seiner Eignung, eine stabile kubische Struktur mit zentrierten Flächen, CFC, zu begünstigen, und andererseits wegen seiner Eignung, die Löslichkeit des zweiten Metalls in Gold zu erhöhen, gewählt ist, wobei das Zusatzmetall unter den folgenden Elementen gewählt ist: Silber, Aluminium, Chrom, Kupfer, Eisen, Hafnium, Mangan, Niob, Palladium, Platin, Vanadium,
    - von 0 % bis 0,5 % einer oder mehrerer Komponenten, die für die Fluidität und Verfeinerung der Korngröße der Legierung ausgewählt sind und die aus Zink, Kobalt oder Iridium gewählt sind,
    wobei das Gemisch außerdem wenigstens einen Niederschlag des zweiten Metalls mit Gold enthält, der aus den Niederschlägen des zweiten Metalls mit Gold gewählt ist, um ein Intermetall zu bilden, das der Legierung eine Härte von mehr als 250 HV verleiht, derart, dass die strukturelle Härtung der Legierung verbessert wird, wobei der ausgewählte Niederschlag ein Niederschlag von Aluminium und von Gold, Al2Au5, ist, dadurch gekennzeichnet, dass der einzige Niederschlag von Gold und Aluminium, der in dieser Legierung vorhanden ist, der Niederschlag ist, der aus Aluminium und Gold, Al2Au5 gewählt ist.
  2. Legierung auf Goldbasis nach Anspruch 1, dadurch gekennzeichnet, dass das Zusatzmetall Silber ist und dass das Verhältnis von der Masse von Aluminium einerseits zu der gesamten Masse von Gold, Silber und Aluminium andererseits kleiner als 0,03 ist.
  3. Legierung auf Goldbasis nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Zusatzmetall Silber einen Massegehalt von 10 % bis 12,5 % der Gesamtmasse hat und durch ein anderes Zusatzmetall mit einer Konzen-tration, die kleiner als jene von Silber mit einem Massegehalt von 10 % bis 12,5 % der Gesamtmasse ist, vervollständigt ist.
  4. Legierung auf Goldbasis nach Anspruch 3, dadurch gekennzeichnet, dass das andere Zusatzmetall Kupfer ist.
  5. Verfahren zum Erhalten einer Legierung auf Goldbasis mit verbesserter Härte, dadurch gekennzeichnet, dass:
    - ein zweites Metall wegen seiner Eignung, Niederschläge mit Gold zu bilden, gewählt ist, wobei dieses zweite Metall Aluminium ist;
    - wenigstens ein Zusatzmetall einerseits wegen seiner Eignung, eine stabile kubische Struktur mit zentrieren Flächen CFC, zu begünstigen und andererseits wegen seiner Eignung, die Löslichkeit bei hoher Temperatur des zweiten Metalls in Gold zu verbessern, gewählt ist, wobei das Zusatzmetall unter den folgenden Elementen gewählt wird: Silber, Aluminium, Chrom, Kupfer, Eisen, Hafnium, Mangan, Niob, Palladium, Platin, Vanadium;
    - die Bedingungen des Einbringens von Niederschlägen des zweiten Metalls mit Gold in eine kubische Struktur mit zentrierten Flächen CFC, die sich aus dem Bringen in Lösung eines Gemisches aus Gold, dem zweiten Metall und dem wenigstens einem Zusatzmetall ergibt, erzeugt werden,
    - ein Gemisch vorbereitet wird, das in Massenanteilen enthält:
    - wenigstens 75 % Gold,
    - von 0,5 % bis 2,1 % des zweiten Metalls,
    - von 22,4 % bis 24,5 % wenigstens eines sogenannten Zusatzmetalls,
    - von 0 % bis 0,5 % einer oder mehrerer Komponenten, die für die Fluidität und die Verfeinerung der Korngröße der Legierung ausgewählt sind und unter Zink, Kobalt oder Iridium gewählt sind,
    - wobei das zweite Metall und das Zusatzmetall gewählt sind, um unter den Niederschlägen des zweiten Metalls mit Gold wenigstens einen besonderen Niederschlag des zweiten Metalls mit Gold zu erhalten, um ein Intermetall zu bilden, das der Legierung eine Härte von mehr als 250 HV verleiht;
    - das Gemisch in Lösung gebracht wird, indem es auf eine Temperatur im Bereich von 650 °C bis 700 °C gebracht wird;
    - eine plötzliche Abkühlung nach dem Bringen in Lösung in Form eines Abschreckens auf Umgebungstemperatur bewirkt wird;
    - nach dem plötzlichen Abkühlen eine strukturierende Anlassbearbeitung auf einer Temperatur im Bereich von 200 °C bis 250 °C ausgeführt wird, um den wenigstens einen ausgewählten Niederschlag des zweiten Metalls mit Gold, der ein Niederschlag von Aluminium und Gold, Al2Au5, ist, zu veranlassen;
    - das Wachsen auf gesteuerte Weise des wenigstens einen ausgewählten Niederschlags bewerkstelligt wird, indem das strukturierende Anlassen während einer ausreichenden Dauer von wenigstens 60 Minuten aufrechterhalten wird, um die geforderte Härte zu erhalten;
    - ein Abkühlen auf Umgebungstemperatur bewirkt wird.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass das plötzliche Abkühlen durch ein Abschrecken mit Wasser ausgeführt wird.
  7. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Auswahl des wenigstens einen ausgewählten Niederschlags auf einen einzigen Niederschlag eingeschränkt wird.
  8. Verfahren nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass das strukturierende Anlassen wenigstens für 24 Stunden nach dem plötzlichen Abkühlen ausgeführt wird.
  9. Verfahren nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, dass für das wenigstens eine Zusatzmetall Silber gewählt wird.
  10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass das Gemisch mit einem Verhältnis von der Masse von Aluminium einerseits zu der gesamten Masse von Gold, Silber und Aluminium andererseits, das kleiner als 0,03 ist, vorbereitet wird.
  11. Verfahren nach einem der Ansprüche 5 bis 10, dadurch gekennzeichnet, dass für das wenigstens eine Zusatzmetall Silber gewählt wird und dass hierzu wenigstens ein anderes Zusatzmetall mit einer Konzentration, die kleiner als jene von Silber ist, hinzugefügt wird.
  12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, dass für das wenigstens eine andere Zusatzmetall Kupfer gewählt wird.
  13. Zeitmessgerät, Schmuck- oder Juwelierware, das bzw. die wenigstens eine Komponente enthält, die aus einer Goldlegierung mit verbesserter Härte nach einem der Ansprüche 1 bis 4 verwirklicht ist und/oder durch ein Verfahren nach einem der Ansprüche 5 bis 12 erhalten wird.
  14. Verwendung eines Niederschlags aus Aluminium und Gold für die Härtung einer Legierung auf Goldbasis mit 18 Karat mit einer Härte von mehr als 250 HV, dadurch gekennzeichnet, dass der Niederschlag ein Niederschlag aus Aluminium und Gold, Al2Au5, ist und in Form eines Intermetalls gebildet ist, um die strukturelle Härtung der Legierung zu verbessern, dadurch gekennzeichnet, dass der Niederschlag ein Niederschlag aus Aluminium und Gold, Al2Au5, für die Härtung einer Goldlegierung ist, die wenigstens 75 % Gold, 0,5 bis 2,1 % Aluminium und 20 % bis 25 % wenigstens eines Zusatzmetalls, das aus Silber und Kupfer gewählt ist und einerseits wegen seiner Eignung, eine stabile kubische Struktur mit zentrierten Flächen CFC, zu begünstigen, und andererseits wegen seiner Eignung, die Löslichkeit von Aluminium in Gold zu erhöhen, gewählt ist, und 0 % bis 0,5 % einer oder mehrerer Komponenten, die für die Fluidität und die Verfeinerung der Korngröße der Goldlegierung gewählt sind, enthält, wobei sich die Verwendung ergibt aus dem Einbringen des Niederschlags aus Aluminium und Gold, Al2Au5, in eine kubische Struktur mit zentrierten Flächen, CFC, die sich aus dem Bringen in Lösung des Gemisches ergibt, das aus Gold, Aluminium, dem wenigstens einen Zusatzmetall, den gewählten Komponenten, falls die Legierung sie enthält, und Niederschlägen aus Aluminium mit Gold gebildet ist, und weiter dadurch gekennzeichnet, dass das Zusatzmetall unter den folgenden Elementen gewählt ist: Silber, Aluminium, Chrom, Kupfer, Eisen, Hafnium, Mangan, Niob, Palladium, Platin, Vanadium.
  15. Verwendung eines Niederschlags nach Anspruch 14, dadurch gekennzeichnet, dass das Zusatzmetall Silber ist und dass das Verhältnis der Masse von Aluminium einerseits und zu der Gesamtmasse von Gold, Silber und Aluminium andererseits kleiner als 0,03 ist.
  16. Verwendung eines Niederschlags nach Anspruch 14, dadurch gekennzeichnet, dass ein Zusatzmetall Silber ist und durch ein anderes Zusatzmetall mit einer Konzentration, die kleiner als jene von Silber ist, vervollständigt ist.
  17. Verwendung eines Niederschlags nach Anspruch 16, dadurch gekennzeichnet, dass das andere Zusatzmetall Kupfer ist.
  18. Verwendung eines Niederschlags nach einem der Ansprüche 14 bis 17, dadurch gekennzeichnet, dass das Einbringen durch das Verfahren nach einem der Ansprüche 5 bis 12 verwirklicht wird.
  19. Verwendung eines Niederschlags nach einem der Ansprüche 14 bis 18, dadurch gekennzeichnet, dass der einzige Niederschlag von Gold und Aluminium, der in der Legierung vorhanden ist, der ausgewählte Niederschlag von Aluminium und Gold, Al2Au5, ist.
EP11725466.4A 2010-06-30 2011-06-16 Goldlegierungen mit verbesserten härte Active EP2588635B1 (de)

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EP10167859.7A EP2402467B1 (de) 2010-06-30 2010-06-30 Goldlegierung mit verbesserter Härte
PCT/EP2011/060041 WO2012000803A2 (fr) 2010-06-30 2011-06-16 Alliage d'or à dureté améliorée
EP11725466.4A EP2588635B1 (de) 2010-06-30 2011-06-16 Goldlegierungen mit verbesserten härte

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RU2665650C1 (ru) * 2017-09-18 2018-09-03 Юлия Алексеевна Щепочкина Ювелирный сплав
CN108677115A (zh) * 2018-04-24 2018-10-19 王振涛 一种黄金超深冷硬金工艺
EP3800511B1 (de) * 2019-10-02 2022-05-18 Nivarox-FAR S.A. Schwenkachse eines regulierorgans
CN112708797A (zh) * 2020-11-25 2021-04-27 西安汇创贵金属新材料研究院有限公司 一种紫色金合金及其制备方法
US11268174B1 (en) * 2021-06-10 2022-03-08 Chow Sang Sang Jewellery Company Limited Jewelry alloy
WO2023110997A1 (fr) * 2021-12-15 2023-06-22 Rolex Sa Matériau composite à matrice métallique pour pièce d'horlogerie
CN115612887B (zh) * 2022-08-12 2024-04-12 深圳市沃尔弗斯珠宝实业股份有限公司 一种高强度k金首饰及其制备方法

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JPS5993872A (ja) * 1982-11-18 1984-05-30 Mitsubishi Metal Corp 表面硬化層を有する装飾用Ａｕ合金部材
DE3764087D1 (de) 1987-03-10 1990-09-06 Steinemann Samuel Intermetallische verbindung und ihre verwendung.
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WO2012000803A2 (fr) 2012-01-05
EP2402467B1 (de) 2015-06-17
JP2013531736A (ja) 2013-08-08
CH705500B1 (fr) 2015-12-31
EP2588635A2 (de) 2013-05-08
CN103038377B (zh) 2016-04-27
EP2402467A1 (de) 2012-01-04
WO2012000803A3 (fr) 2012-09-20
HK1184198A1 (zh) 2014-01-17
CN103038377A (zh) 2013-04-10

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