EP2650394A1 - Alliage de platine et bijou fabriqué à partir de cet alliage de platine - Google Patents

Alliage de platine et bijou fabriqué à partir de cet alliage de platine Download PDF

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Publication number
EP2650394A1
EP2650394A1 EP13001842.7A EP13001842A EP2650394A1 EP 2650394 A1 EP2650394 A1 EP 2650394A1 EP 13001842 A EP13001842 A EP 13001842A EP 2650394 A1 EP2650394 A1 EP 2650394A1
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EP
European Patent Office
Prior art keywords
platinum
gold
platinum alloy
weight
alloy
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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.)
Granted
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EP13001842.7A
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German (de)
English (en)
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EP2650394B1 (fr
Inventor
Thomas Laag
Heinz-Günter Schenzel
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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 DE201220003711 external-priority patent/DE202012003711U1/de
Priority claimed from DE201210007299 external-priority patent/DE102012007299A1/de
Application filed by C Hafner GmbH and Co KG filed Critical C Hafner GmbH and Co KG
Publication of EP2650394A1 publication Critical patent/EP2650394A1/fr
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    • 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
    • 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

Definitions

  • the invention relates to a platinum alloy containing between 93 and 97 wt .-% platinum and gold, as well as an article made from this platinum alloy jewelery.
  • Such a platinum alloy is in the US 4,165,983 and in the belonging to the patent family of the aforementioned patent right DE 28 07 587 described.
  • These documents disclose an at least three-component platinum coating having a platinum content of at least apart from impurities 95 wt .-%, wherein 1.5 to 3.5 wt .-% gallium and to compensate for 100 wt .-% of at least one of the metals gold or indium, palladium, silver, copper, cobalt, nickel, ruthenium, iridium and Rhodium are provided.
  • the aforementioned compensating metals are present in the known platinum alloy in a proportion of 2 to 3 wt.%, So that when using gold as the compensating metal, the known platinum alloy contains 2 to 3 wt .-% gold.
  • This platinum alloy is based on the finding that one arrives at a platinum alloy with a minimum platinum content of 95% by weight, which nevertheless can be cast more easily than pure platinum, if at least 95% by weight of platinum 1.5 to Adding 3.5 wt .-% gallium and at least one of the aforementioned compensation metals.
  • a platinum alloy which contains a platinum content of - apart from impurities - at least 95 wt .-% and gallium in a proportion of 1.5 to 3.5 wt.%, Furthermore, it is provided that to compensate for the aforementioned shares 100 wt .-% of at least one of the metals indium, gold, palladium, silver, copper, cobalt, nickel, ruthenium, iridium and rhodium is provided.
  • Such an alloy is said to be suitable for the manufacture of platinum jewelery and to meet the requirements of the London Goldsmiths Guild and yet shed more easily than pure platinum as a result of the use of gallium, the melting point of the alloy being substantially below the melting point of pure platinum lies.
  • a disadvantage of these known platinum alloys is that although gallium has low, but certainly not negligible toxic properties.
  • the use of such a gallium-containing alloy for an application in the jewelry industry is therefore considered by today's standards - especially in terms of bio-compatibility - unsatisfactory.
  • gallium has a disadvantageous high oxygen affinity, which may have negative effects in a casting process.
  • they tend gallium-containing platinum alloys in a heat treatment to embrittlement.
  • the JP 6118639 describes a combination of platinum with palladium and copper as well as tungsten or molybdenum.
  • the JP 61034133 discloses an alloy with platinum-cobalt copper and other additives.
  • JP 61272333 discloses a platinum-cobalt alloy with additions of tungsten, molybdenum, titanium, palladium, zinc or iron.
  • the JP 02043332 describes a platinum-palladium-rhenium alloy with additions of nickel, iron and cobalt.
  • the JP 61281843 is described a platinum alloy with iron and copper and the EP 1 254 964 describes an alloy platinum-iron with additions of ruthenium and / or iridium.
  • the goal of all the above alloys is to lower the melting temperature of the platinum for better use in jewelery casting and to improve the mechanical strength.
  • the noble character of the platinum should not be impaired and the good mechanical processability should be preserved.
  • the object is achieved according to the invention in that the gold content is between 1 and 4% by weight and that the alloy furthermore contains 1 to 4% by weight of indium, the proportions of platinum, indium and gold, apart from impurities , to 100 wt .-% complete.
  • the platinum alloy according to the invention is characterized by a high strength, a low melting interval and a good chemical stability. Surprisingly, it has been found that the combination of platinum with indium and gold lowers the melting interval of the platinum alloy according to the invention, improves the hardness and increases the noble character of the platinum alloy according to the invention.
  • the comparatively low melting interval of the platinum alloy according to the invention leaves sufficient freedom for a casting process to vary the melting temperature, so that the platinum alloy according to the invention is particularly suitable for jewelery casting.
  • the platinum alloy according to the invention is also very well suited for semifinished product production because it combines high strengths with good formability, so that the semifinished products produced from the platinum alloy according to the invention can later be easily processed with a CNC machine.
  • the alloy according to the invention contains at least one grain refiner with a content of up to 3% by weight, the grain refiner (s) preferably replacing the corresponding amount of gold.
  • the grain refiner iridium and / or ruthenium are used as grain refiners.
  • a further advantageous embodiment of the invention provides that the platinum alloy contains as grain refiner between 0.1 and 2.1 wt .-% iridium and / or 0.5 to 1.0 wt .-% ruthenium.
  • a further advantageous embodiment of the invention provides that the platinum alloy contains 95 to 96 wt .-% platinum, 1 to 3 wt .-% gold and 2 to 3 wt .-% indium.
  • a further advantageous embodiment of the invention provides that the alloy 95 to 95.3 wt .-% platinum, 1 to 2.2 wt .-% gold and 2.5 to 3 wt .-% indium and 0.1 to 0 Contains 3 wt .-% iridium.
  • a further advantageous embodiment of the invention provides that the platinum alloy that the alloy 95 to 95.3 wt .-% platinum, 1 to 2 wt .-% gold, 2.5 to 3 wt .-% iridium and 0.5 to 1 wt .-% Ruthenium contains.
  • a first embodiment of the platinum alloy described has 95, 2 wt .-% platinum, 2 wt .-% gold, 2.7 wt .-% indium and 0.1 wt .-% iridium.
  • a second embodiment of the described platinum alloy provides that it comprises 95% by weight of platinum, 2.2% by weight of gold, 2.7% by weight of indium and 1% by weight of iridium.
  • a third embodiment provides that the alloy comprises 95% by weight of platinum, 2% by weight of gold, 2.7% by weight of indium and 3% by weight of iridium.
  • the fourth embodiment of the described platinum-gold alloy has a composition of 95.2% by weight of platinum, 1.3% by weight of indium, 0.5% by weight of iridium.
  • a fifth embodiment provides that the described alloy has 95.2% by weight of platinum, 1.1% by weight of gold, 2.7% by weight of indium and 1% by weight of iridium.
  • a sixth exemplary embodiment provides that the described alloy has 95.2% by weight of platinum, 1.6% by weight of gold, 2.7% by weight of indium and 5% by weight of ruthenium.
  • a seventh embodiment provides that the described alloy has 95.2% by weight of platinum, 1.1% by weight of gold, 2.7% by weight of indium and 1% by weight of ruthenium.
  • An eighth embodiment provides that the described alloy has 95.3% by weight of platinum, 1% by weight of gold, 2.7% by weight of indium and 1% by weight of ruthenium.
  • a ninth exemplary embodiment provides that the described alloy has 95.3% by weight of platinum, 1% by weight of gold, 2.7% by weight of indium and 1% by weight of iridium. It has been found that the described properties not only occur in the aforementioned embodiments, but that the platinum, gold and indium content can be varied within certain limits. Characteristic of the described alloys is a platinum content of 93 to 97 wt .-%, a gold content of 1 to 4 wt .-% and an indium content of 1 to 4 wt .-%, wherein the proportions of platinum, Indium and gold, with the exception of impurities, add up to 100% by weight.
  • the platinum alloy contain 95 to 96% by weight of platinum, 1 to 3% by weight of gold and 2 to 3% by weight of indium. It is further preferred that the platinum alloy 95 to 95.3 wt.% Platinum, 1 to 2.2 wt .-% gold, 2.5 to 3 wt .-% indium and 0.1 to 0.3 wt .-% Contains iridium. It is further preferred that the platinum alloy contains 95 to 95.3% by weight of platinum, 1 to 2% by weight of gold, 2.5 to 3% by weight of indium and 0.5 to 1% by weight of ruthenium. It is obvious to the person skilled in the art that the aforementioned intervals are not to be understood as rigid intervals, but rather that all intermediate values and combinations of values which fall within the aforementioned intervals should also be included in the application.
  • the platinum alloys described contain at least one grain refiner in a proportion of up to 3% by weight, preferably iridium and / or ruthenium, the proportion of iridium being between 0.1 and 2.1% by weight and / or that of Ruthenium is between 0.5 to 1 wt.%.
  • the proportion of grain refiner (s) then preferably replaces the corresponding amount of gold.
  • FIG. 1 is now an a * / b * -diagram, which contains the values measured in the L * a * b * color space.
  • the L * a * b color space is a measurement space in which all perceptible Colors are included, where L * stands for the brightness, a * for green-red and b * for yellow-blue.
  • the measurements given here were carried out according to the standard conditions defined in DIN 5033. For comparison, the corresponding values of the following standard platinum alloys were also measured:
  • a Pt950CuGa alloy contains 95.1 wt% platinum, 2.1 wt% gold, 2.8 wt% gallium, a Pt950Cu alloy contains 95 wt% platinum and 5 wt% copper, a Pt950Co alloy contains 95% by weight and 5% by weight of cobalt, and a Pt950Ru alloy contains 95% by weight of platinum and 5% by weight of ruthenium. Furthermore, the corresponding values for rhodium-plated white gold, palladium 950 and silver Ag 935, ie the most common silver alloy, were determined.
  • FIG. 1 now shows the a * / b * diagram of the platinum alloy described in comparison, wherein the first embodiment of the described platinum alloys in the diagram of FIG. 1 with the Pt950Auln1, and the second and the third embodiment with Pt950Auln2 and Pt950Auln3 were called.
  • the group formed by the described platinum alloys differs significantly from the standard platinum alloys described above in the aforementioned diagram. Noteworthy is the negative a * value of the platinum-gold-indium alloys described, while all other alloys tested have a neutral or positive a * value. In addition, the b * values of the described alloys are all smaller than 5, the yellow component is then low.
  • the measured L *, a * and b * values are shown in the table FIG. 2 summarized.
  • the yellowness index YI included.
  • the color impression of the alloys described is thus comparable to that of a galvanic rhodium layer.
  • the alloy according to the first embodiment has a hardness in HV of 160, that of the fourth embodiment has a hardness of 165 HV, that of the fifth embodiment of 155 HV, that of the sixth embodiment of 168 HV and that of the seventh embodiment of 171 HV.
  • alloys containing ruthenium according to the sixth exemplary embodiment are significantly higher Hardness, so that by the use of ruthenium about 170 HV is possible.
  • Another advantage of the described alloy is that it does not harden. This is especially for the casting or the heat treatment such. As soldering during the processing process important, since this undesirable embrittlement occur.
  • the solidus temperature of the described alloys is about 1,632 ° C, the liquidus temperature at about 1,657 ° C.
  • This comparatively low melting interval advantageously allows sufficient freedom for the casting process to vary the melting temperature.
  • the casting trials with the described alloys have yielded good to very good results, the tendency for porosity is less pronounced than in known platinum alloys and crucible or embedding mass reactions were not observed.
  • the alloys described are characterized by a high chemical stability also due to their high precious metal content.
  • alloys are well suited for semis production, in particular for the subsequent CNC machining, since high strengths combine with good deformability.
  • the described platinum alloys have good color and mechanical properties despite the avoidance of toxically dubious gallium and are characterized by a low melting point and good mechanical processing qualities.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Adornments (AREA)
EP13001842.7A 2012-04-13 2013-04-10 Alliage de platine et bijou fabriqué à partir de cet alliage de platine Active EP2650394B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201220003711 DE202012003711U1 (de) 2012-04-13 2012-04-13 Platinlegierung und ein aus dieser Platinlegierung hergestellter Schmuckgegenstand
DE201210007299 DE102012007299A1 (de) 2012-04-13 2012-04-13 Platinlegierung und ein aus dieser Platinlegierung hergestellter Schmuckgegenstand

Publications (2)

Publication Number Publication Date
EP2650394A1 true EP2650394A1 (fr) 2013-10-16
EP2650394B1 EP2650394B1 (fr) 2016-05-04

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EP (1) EP2650394B1 (fr)
ES (1) ES2581862T3 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2807587A1 (de) 1977-02-23 1978-08-24 Johnson Matthey Co Ltd Platinlegierung
JPS57145949A (en) * 1981-03-03 1982-09-09 Tanaka Kikinzoku Kogyo Kk Platinum alloy for accessory
JPS57169042A (en) * 1981-04-11 1982-10-18 Tanaka Kikinzoku Kogyo Kk Platinum alloy for accessory
JPS59150041A (ja) * 1983-02-16 1984-08-28 Tanaka Kikinzoku Kogyo Kk 装飾品用白金合金
JPS6134133A (ja) 1984-07-25 1986-02-18 Tanaka Kikinzoku Kogyo Kk 装飾品用白金合金
JPS61272333A (ja) 1985-05-27 1986-12-02 Tanaka Kikinzoku Kogyo Kk 装飾品用白金合金
JPS61281843A (ja) 1985-06-07 1986-12-12 Tanaka Kikinzoku Kogyo Kk 装飾品用白金合金
JPH0243332A (ja) 1988-08-02 1990-02-13 Tokuriki Honten Co Ltd 装飾用白金合金
JPH06118639A (ja) 1992-10-06 1994-04-28 Brother Ind Ltd 感光性マイクロカプセルの製造方法
EP1254964A1 (fr) 2001-05-03 2002-11-06 W.C. Heraeus GmbH & Co. KG Alliage platine - fer, notamment pour bijoux
JP2005029879A (ja) * 2003-07-14 2005-02-03 Kuwayama Corp インジウムを含有する宝飾品用硬化白金合金及び製品

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2807587A1 (de) 1977-02-23 1978-08-24 Johnson Matthey Co Ltd Platinlegierung
US4165983A (en) 1977-02-23 1979-08-28 Johnson, Matthey & Co., Limited Jewelry alloys
JPS57145949A (en) * 1981-03-03 1982-09-09 Tanaka Kikinzoku Kogyo Kk Platinum alloy for accessory
JPS57169042A (en) * 1981-04-11 1982-10-18 Tanaka Kikinzoku Kogyo Kk Platinum alloy for accessory
JPS59150041A (ja) * 1983-02-16 1984-08-28 Tanaka Kikinzoku Kogyo Kk 装飾品用白金合金
JPS6134133A (ja) 1984-07-25 1986-02-18 Tanaka Kikinzoku Kogyo Kk 装飾品用白金合金
JPS61272333A (ja) 1985-05-27 1986-12-02 Tanaka Kikinzoku Kogyo Kk 装飾品用白金合金
JPS61281843A (ja) 1985-06-07 1986-12-12 Tanaka Kikinzoku Kogyo Kk 装飾品用白金合金
JPH0243332A (ja) 1988-08-02 1990-02-13 Tokuriki Honten Co Ltd 装飾用白金合金
JPH06118639A (ja) 1992-10-06 1994-04-28 Brother Ind Ltd 感光性マイクロカプセルの製造方法
EP1254964A1 (fr) 2001-05-03 2002-11-06 W.C. Heraeus GmbH & Co. KG Alliage platine - fer, notamment pour bijoux
JP2005029879A (ja) * 2003-07-14 2005-02-03 Kuwayama Corp インジウムを含有する宝飾品用硬化白金合金及び製品

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Publication number Publication date
EP2650394B1 (fr) 2016-05-04
ES2581862T3 (es) 2016-09-07

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