EP2818567B1 - Alliage en or blanc, notamment pour l'utilisation dans le cadre d'un procédé de béton coulé - Google Patents

Alliage en or blanc, notamment pour l'utilisation dans le cadre d'un procédé de béton coulé Download PDF

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Publication number
EP2818567B1
EP2818567B1 EP14002176.7A EP14002176A EP2818567B1 EP 2818567 B1 EP2818567 B1 EP 2818567B1 EP 14002176 A EP14002176 A EP 14002176A EP 2818567 B1 EP2818567 B1 EP 2818567B1
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Prior art keywords
gold alloy
weight
palladium
platinum
alloy
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EP14002176.7A
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German (de)
English (en)
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EP2818567A1 (fr
Inventor
Heinz-Günter Schenzel
Thomas Laag
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C Hafner GmbH and Co KG
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C Hafner GmbH and Co KG
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Priority claimed from DE102013010700.8A external-priority patent/DE102013010700B4/de
Priority claimed from DE202013005743.2U external-priority patent/DE202013005743U1/de
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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

Definitions

  • the invention relates to a white gold alloy suitable in particular for use in a cast-on-cast method, which comprises between 56 and 60% by weight of gold, 25 to 35% by weight of silver, 5 to 10% by weight of zinc and 0.2 to 5 wt .-% palladium.
  • Such a white gold alloy is known. It contains palladium as a whitening agent. This causes the known gold alloy to have an approximately white color.
  • the known white gold alloy in a Stone casting process, ie a casting process for pieces of jewelry, in which the gems, usually diamonds, are included in the jewelry to use, the lowest possible melting temperature of the alloy is necessary, otherwise there is a risk that the miteingegossenen stones during casting to be damaged.
  • the known gold alloy should have a white color as possible, which requires a higher content of bleaching elements such as nickel or palladium.
  • a high proportion of palladium counteracts a low melting interval, since palladium shifts the melting interval of an alloy to higher temperatures than, for. As nickel.
  • the color of a gold alloy and thus also a white gold alloy is characterized by the so-called yellowness index. This goes back to an initiative of the Manufacturing Jewels and Suppliers of America and the World Gold Council. It has developed a color standardization for white gold, which z. B. in the Journal "Gold Bulletin 2005", June 2005, Issue 38/2, pages 55-67 is described. As a white gold alloy is then referred to a gold alloy, which has a yellowness index of less than 32.
  • a dental alloy which has the following composition: 40 to 80% by weight of gold; 15 to 50% by weight of silver; Palladium and platinum together in an amount of from 0 to 20% by weight, in the case that palladium and platinum are present simultaneously, one of these elements is present in a proportion of not more than 4% by weight; a total of 0 to 5 wt .-% of one or more elements from a group containing tin, zinc, indium, gallium, germanium, aluminum, silicon and Bohr; total 0 to 5% by weight of one or more elements from a group containing tantalum, titanium and rhenium; a total of 0 to 5 wt .-% of one or more elements from a group containing rhodium, iridium and ruthenium; a total of 0 to 5 wt .-% of one or more elements from a group containing molybdenum, niobium, tungsten,
  • the dental alloy described in the aforementioned document is said to have a yellow-gold color even at a level of 50% by weight of gold. So it has a yellowness index, which is well above a value of 32 and, typically has a Yellowness value between 40 and 60, possesses.
  • the dental gold solders known from this publication should be used for brazing copper-free dental alloys, which in turn have a yellow-golden color. Consequently, the known copper and cadmium-free dental gold solders therefore have a yellowness index which is well above 32.
  • the JP 561-67 731 A describes a dental alloy powder for a kneading and filling material, which 0 to 20 wt .-% palladium, 0 to 5 wt .-% tin, 0 to 10 wt .-% indium, 0 to 10 wt .-% platinum, 0 to 40 wt .-% silver, 0 to 30 wt .-% copper and the remainder gold.
  • Such an alloy in turn has a yellow-gold color, so a yellowness index of well over 32.
  • the US 4,008,080 A describes a copper-free dental gold alloy, which 25 to 40 wt .-% silver, 40 to 60 wt .-% gold, 5 to 20 wt .-% palladium, 0.05 to 0.5 wt .-% iridium, 0 to 6 wt % Indium, 0 to 6 wt% tin, and 0 to 2 Wt .-% zinc, wherein at least 2% of the aforementioned non-noble metal are present.
  • This gold alloy is no white gold alloy.
  • the EP 0 225 483 describes a dental gold alloy for removable bridges. It contains 50 to 61% by weight of gold, 20 to 35% by weight of silver, 10 to 50% by weight of palladium, 0 to 2% by weight of platinum, 0 to 0.2% by weight of iridium and / or Rotinium and 3 to 5 wt .-% zinc. Again, this dental gold alloy has a golden yellow color, so represents no white gold alloy.
  • a white gold alloy of the type mentioned in such a way that the alloy according to the invention is nickel-free or substantially nickel-free and has good processability, in particular due to their melting interval is suitable for a cast-stone process.
  • the white gold alloy contains 0.05 to 5 wt .-% of platinum, and that the proportion of palladium and platinum in total not more than 5 wt .-% is that copper in a proportion of between more is present as 0 wt .-% and 2 wt .-%, wherein up to 2 wt .-% of the silver are replaced by the same amount of copper, that preferably up to 1 wt .-% gallium are present, preferably to 2% by weight of the zinc is replaced by the same amount of tin, and that preferably the white gold alloy contains at least one grain of fine iridium and / or ruthenium, this preferably added fraction of the grain or grains containing the corresponding amount of palladium and / or or platinum, with the weight proportions of the abovementioned alloy components - apart from customary admixtures and impurities - supplementing to 100 wt .-%, and that the white gold alloy has a yellowness index of less than
  • a nickel-free white gold alloy is created in an advantageous manner - apart from impurities or unavoidable admixtures, which is particularly suitable for a cast-stone method and in terms of their mechanical strength, their chemical resistance, and their polishability at the jewelery made from such an alloy meets the requirements:
  • the alloy of the invention has a hardness between 120 to 150 HV, a yellowness index of ⁇ 32, a melting interval of ⁇ 900 ° and a sufficient oxidation and corrosion resistance.
  • An advantageous development of the invention provides that up to 2% of the zinc present in the alloy according to the invention is replaced by the same proportion of tin. Such a measure has the advantage that the melting temperature is further reduced.
  • a first embodiment provides that the white gold alloy described contains between 56 and 60% by weight gold, preferably 58-59% by weight gold, in particular 58.5% by weight gold, 25-35% by weight silver , preferably 30 wt .-% silver, 5-10 wt .-% zinc, 0.2 to 5 wt .-% palladium and 0.05-5 wt .-% platinum, wherein the aforementioned alloying components - of conventional impurities and unavoidable admixtures - supplement to 100 wt .-%. The proportion of palladium and platinum is in total at most up to 5 wt .-%.
  • the described alloy is obtained by replacing 0.05-5% by weight of palladium with the corresponding amount of platinum in a known alloy containing the abovementioned alloy components gold, silver, zinc and palladium in the abovementioned proportions.
  • the described alloy has a yellowness index between 26 and 30, well below the accepted limit of 32, where an alloy is no longer referred to as white gold.
  • the white gold alloy according to the first embodiment thus contains 56 to 60 wt .-% gold, preferably 58 to 59 wt .-% gold, in particular 58.5 wt .-% gold, in total from 25 to 35 wt .-% of silver and Copper, preferably in total 30 wt .-% silver and copper, wherein copper is present in a proportion of more than 0 and up to 2 wt .-%, 5 wt .-% zinc, 02, to 5 wt .-% palladium and 0.05 to 5 wt .-% of platinum, wherein the aforementioned alloying components - apart from conventional impurities and unavoidable admixtures - add up to 100 wt .-% and the proportion of palladium and platinum in
  • a second embodiment provides that the white gold alloy 58.5 wt .-% gold, 30.5 wt .-% silver, 6 wt .-% zinc, 1 wt .-% gallium, 1 wt .-% tin and 3 wt .-% platinum, wherein the above-mentioned components of the alloy - apart from conventional impurities and admixtures - add up to 100 wt .-%.
  • Such an alloy has an L * value of 91.47 and an a * value of-1.51 and a b * value of 14.45. It has a yellowness index of about 26.5. This is thus well below the value of 32, in which a gold alloy is referred to as white.
  • an alloy in which the above substitution of 3% by weight of palladium has not been made by 3% by weight of platinum ie an alloy containing 58.5% by weight of gold, 30.5% by weight, has Silver, 6% by weight of zinc, 1% by weight of gallium, 1% by weight of tin and 3% by weight of palladium, has a yellowness index of 30.9, an L * value of about 91, an a * value of about -1.3 and a b * value of about 16.8.
  • the replacement of 3% by weight of palladium by 3% by weight of platinum thus leads to a significant reduction in the yellowness index from about 30.9 to about 26.5.
  • the described white gold alloy, in which 3% by weight of palladium has been replaced by 3% by weight of platinum is thus significantly lighter than the latter.
  • a third embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 27.0 wt .-% silver, 1.5 wt .-% palladium, 1.5 wt .-% copper, 7 %
  • zinc 0.5% by weight of gallium, 1% by weight of tin and 3% by weight of platinum, with the abovementioned constituents of the alloy in turn, apart from customary impurities and admixtures 100 wt .-% complete.
  • the color parameters L *, a * and b * are 91.02, -1.09, 15.16.
  • the yellowness index is again below the value of 32 at about 28.2.
  • 3% by weight of palladium was replaced by 3% by weight of platinum.
  • a fourth embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 24.7 wt .-% silver, 3 wt .-% palladium, 1.5 wt .-% copper, 8.3 %
  • zinc 1% by weight of gallium and 3% by weight of platinum, with the abovementioned constituents of the alloy, apart from customary impurities and admixtures, being added to 100% by weight.
  • the color parameters L *, a * and b * are 90.9, -0.96, 15.26.
  • the yellowness index is again below the yellowness index of 32, which is regarded as the limit for a white gold alloy.
  • a fifth embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 26.5 wt .-% silver, 3 wt .-% palladium, 1.5 wt .-% copper, 7.5 %
  • zinc 1% by weight of gallium and 2% by weight of platinum, with the abovementioned constituents of the alloy, apart from conventional impurities and admixtures, being added to 100% by weight.
  • the color parameters L *, a * and b * are 90.98, -1.02, 15.38.
  • the yellowness index is again below the value of 32 at 28.71. In the alloy described above, 2% by weight of platinum was replaced.
  • a sixth embodiment of the invention provides that the white gold alloy 58.5 wt .-% gold, 28.5 wt .-% silver, 2 wt .-% palladium, 7 wt .-% zinc, 1 wt .-% Gallium and 3 wt .-% platinum, wherein the above-mentioned components of the alloy - apart from conventional impurities and admixtures - add up to 100 wt .-%.
  • the color parameters L *, a * and b * are 90.36, -1.11, 16.08.
  • the yellowness index is again below the value of 32 at 29.95.
  • the proportions of the corresponding alloy components indicated in the second to sixth embodiments are only exemplary examples which are not intended to limit the generality of the foregoing. It is essential that the above-described alloys are obtained by replacing 0.05-5% by weight of palladium with the same amount of platinum with otherwise identical alloying parameters.
  • the described alloys one or more Kornfeiner, such as. As iridium or ruthenium, are added, wherein the added proportions of the grain or the grain replace the corresponding proportion of palladium and / or platinum, so that then the aforementioned alloy components and the proportion of grain refiner (s) - apart from conventional admixtures and impurities - add up to 100% by weight.
  • Kornfeiner such as. As iridium or ruthenium
  • the measures described form a white gold alloy which has a yellowness index which is below the generally accepted index value of 32, in which a white gold alloy is no longer designated as such .
  • the described white gold alloy is characterized by the fact that - what was not to be expected - in such a constellation platinum has a better bleaching effect than palladium. Since platinum has a much higher atomic weight than palladium and therefore, with the same proportion by weight, much fewer atoms become active in the respective alloy, this is surprising. In addition, it has unexpectedly been found that platinum improves the hardness of the described alloys.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Claims (8)

  1. Alliage en or blanc, qui contient 56 à 60 % en poids d'or, 25 à 35 % en poids d'argent, 5 à 10 % en poids de zinc et 0,2 à 5 % en poids de palladium, caractérisé en ce que l'alliage en or blanc contient 0,05 à 5 % en poids de platine, et en ce que la proportion de palladium et de platine est égale au total aux maximum à 5 % en poids, en ce que du cuivre est prévent en une proportion comprise entre plus de 0 % en poids et 2 % en poids, sachant que jusqu'à 2 % en poids d'argent est remplacé par la même quantité de cuivre, en ce que de préférence jusqu'à 1 % en poids de gallium est présent, en ce que de préférence jusqu'à 2 % en poids de zinc est remplacé par la même quantité d'étain, et en ce que de préférence l'alliage en or blanc contient au moins un affineur de grain, sachant que ladite fraction de préférence ajoutée du ou des affineurs de grain, l'iridium et/ou le ruthénium, remplace la fraction correspondante de palladium et/ou de platine, sachant que les proportions en poids des composants se complètent jusqu'à parvenir à 100 % du poids - abstraction faite des mélanges et des impuretés classiques -, et en ce que l'alliage en or blanc possède un indice de jaunissement inférieur à 32.
  2. Alliage en or blanc selon à revendication 1, caractérisé en ce que l'alliage en or blanc contient 58 à 59 % en poids d'or, en particulier 58,5 % en poids d'or.
  3. Alliage en or blanc selon l'une quelconque des revendications précédentes, caractérisé en ce que l'alliage en or blanc contient 30 % en poids d'argent.
  4. Alliage en or blanc selon l'une quelconque des revendications précédentes, caractérisé en ce que l'alliage en or blanc contient 58,5 % en poids d'or, 30,5 % en poids d'argent, 6 % en poids de zinc, 1 % en poids de gallium, 1 % en poids d'étain et 3 % en poids de platine.
  5. Alliage en or blanc selon l'une quelconque des revendications précédentes, caractérisé en ce que l'alliage en or blanc contient 58,5 % en poids d'or, 27 % en poids d'argent, 1,5 % en poids de palladium, 1,5 % en poids de cuivre, 7 % en poids de zinc, 0,5 % en poids de gallium, 1 % en poids d'étain et 3 % en poids de platine.
  6. Alliage en or blanc selon l'une quelconque des revendications précédentes, caractérisé en ce que l'alliage en or blanc contaient 58,5 % en poids d'or, 24,7 % en poids d'argent, 3 % en poids de palladium, 1,5 % en poids de cuivre, 8,3 % en poids de zinc, 1 % en poids de gallium et 3 % en poids de platine.
  7. Alliage en or blanc selon l'une quelconque des revendications précédentes, caractérisé en ce que l'alliage en or blanc contient 58,5 % en poids d'or, 26,5 % en poids d'argent, 3 % en poids de palladium, 1,5 % en poids de cuivre, 7,5 % en poids de zinc, 1 % en poids de gallium et 2 % en poids de platine.
  8. Alliage en or blanc selon l'une quelconque des revendications précédentes, caractérisé en ce que l'alliage en or blanc contient 58,5 % en poids d'or, 28,5 % en poids d'argent, 2 % en poids de palladium, 7 % en poids de zinc, 1 % en poids de gallium et 3 % en poids de platine.
EP14002176.7A 2013-06-27 2014-06-25 Alliage en or blanc, notamment pour l'utilisation dans le cadre d'un procédé de béton coulé Active EP2818567B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013010700.8A DE102013010700B4 (de) 2013-06-27 2013-06-27 Weißgold-Legierung, insbesondere zur Verwendung für ein Steinguss-Verfahren
DE202013005743.2U DE202013005743U1 (de) 2013-06-27 2013-06-27 Weißgold-Legierung, insbesondere zur Verwendung für ein Steinguss-Verfahren

Publications (2)

Publication Number Publication Date
EP2818567A1 EP2818567A1 (fr) 2014-12-31
EP2818567B1 true EP2818567B1 (fr) 2016-09-07

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015006386U1 (de) 2015-09-16 2016-12-19 C. Hafner Gmbh + Co. Kg Weißgold-Legierung
EP3144401B1 (fr) 2015-09-16 2021-02-17 C. Hafner GmbH + Co. KG Alliage d'or blanc pour bijoux
DE102015011788A1 (de) 2015-09-16 2017-03-16 C. Hafner Gmbh + Co. Kg Weißgold-Legierung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2453799C3 (de) 1974-11-13 1979-08-02 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt Kupferfreie Dentalgoldlegierungen
DE2638837C3 (de) * 1976-08-28 1979-06-07 W.C. Heraeus Gmbh, 6450 Hanau Dentallot-Legierung auf Gold-Basis
JPS6167731A (ja) 1984-09-07 1986-04-07 Tokuriki Honten Co Ltd 歯科練成充填用合金粉末
EP0225483B1 (fr) 1985-12-07 1990-01-24 Degussa Aktiengesellschaft Alliages dentaires à base d'or
NL9001986A (nl) 1990-09-10 1992-04-01 Elephant Edelmetaal Bv Dentaal porselein, werkwijze voor het vervaardigen van een tandheelkundige restauratie, dentaallegering.
DE19719677C2 (de) * 1996-09-18 2003-04-24 Herbst Bremer Goldschlaegerei Verwendung einer Edelmetall-Legierung im Dentalbereich
DE19958800A1 (de) * 1999-06-30 2001-01-04 Wieland Edelmetalle Weißgold-Schmucklegierung
DE10008744A1 (de) * 2000-02-24 2001-08-30 Wieland Edelmetalle Weißgold-Schmucklegierung
JP4470658B2 (ja) * 2004-09-03 2010-06-02 日本歯研工業株式会社 超低溶融性及び超低収縮性の特に歯科用に適する金合金
US9865330B2 (en) 2010-11-04 2018-01-09 Qualcomm Incorporated Stable SRAM bitcell design utilizing independent gate FinFET

Non-Patent Citations (1)

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