EP0381994B1 - Alliage à haute teneur en or pour pièces de bijouterie - Google Patents

Alliage à haute teneur en or pour pièces de bijouterie Download PDF

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Publication number
EP0381994B1
EP0381994B1 EP90101360A EP90101360A EP0381994B1 EP 0381994 B1 EP0381994 B1 EP 0381994B1 EP 90101360 A EP90101360 A EP 90101360A EP 90101360 A EP90101360 A EP 90101360A EP 0381994 B1 EP0381994 B1 EP 0381994B1
Authority
EP
European Patent Office
Prior art keywords
weight
alloys
alloy
gold
gallium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90101360A
Other languages
German (de)
English (en)
Other versions
EP0381994A1 (fr
Inventor
Helmut Dr. Knosp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
C Hafner GmbH and Co KG
Original Assignee
C Hafner GmbH and Co KG
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 C Hafner GmbH and Co KG filed Critical C Hafner GmbH and Co KG
Publication of EP0381994A1 publication Critical patent/EP0381994A1/fr
Application granted granted Critical
Publication of EP0381994B1 publication Critical patent/EP0381994B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/02—Alloys based on gold

Definitions

  • Gold alloys which have certain commercially available gold contents have long been known for the production of jewelry.
  • One of the best known alloys contains 750/000 gold (18 kt) and is usually alloyed with copper and silver.
  • the mechanical, physical and chemical properties of these alloys can be optimally matched to their respective use as jewelry alloys.
  • Alloys of this type must be readily deformable in order to be able to produce sheet metal, wire and tube in the dimensions desired in each case. They must also have a minimum stability, for example for the production of delicate jewelry or watch straps, and in addition sufficient Hardness and sufficiently high elongation at break are available.
  • the alloys for the production of castings are easy to cast, that is, in addition to having good flowability in the molten state, they also have a high resistance to oxidation. It is also essential that high-quality gold alloys for jewelry purposes are tarnish-resistant even when worn for a long time. Finally, certain demands are made on the color of gold alloys.
  • the material value of a piece of jewelry is essentially determined by the gold content of the alloy. There is therefore often a desire among buyers to purchase an alloy that contains as much gold as possible. In line with this is the demand for a color as close as possible to that of pure gold. Another advantage is that the higher the gold content, the better the tarnish resistance.
  • the invention is based on specifying alloys which, with a gold content of 950/000 (approx. 23 kt) and higher, have the properties required for use in jewelry.
  • the solution to this problem results from claim 1.
  • the subclaims 2 to 5 represent preferred embodiments of the invention.
  • the additional metals result alone or in combination with fine gold alloys that are useful for jewelry purposes.
  • the table shows some exemplary alloys with the above-mentioned additional metals and their properties.
  • the hardness in the soft annealed state can be increased by two to three times compared to fine gold.
  • All alloys are also characterized by a high degree of deformation and an associated, substantial increase in hardness. They thus meet the essential requirements that are placed on jewelry alloys.
  • the hardness can be increased particularly effectively by adding iron, cobalt and gallium.
  • the alloys are homogeneous both in the cast and in the recrystallized state and therefore behave like fine gold in terms of tarnish resistance.
  • the addition of gallium, germanium, indium and tin reduce the melting interval and have a favorable effect on the flowability during casting.
  • the machining is favorably influenced by adding cobalt, rhenium and tantalum.
  • Gallium cobalt, copper and rhenium significantly increase the abrasion resistance of the alloys during wear. With the addition of gallium and germanium, the barrel properties are improved.
  • the alloys with 99% gold with the addition of germanium, gallium and cobalt have a rich yellow fine gold color.
  • the alloys described do not have these disadvantages, but can be soldered without problems, without forming disruptive scale layers on the surface.
  • the casting surface is clean and free of oxides after the investment has been removed.
  • the alloys according to the invention can also be processed into watch cases, watch straps, coins and medals.
  • table High gold holding jewelry alloys Current No Composition in% mass content Hardness HV5 annealed Hardness HV5 80% deformed Melting interval ° C Au other 1 95 4.0 Ga, 1.0 Fe 75 190 900 - 750 2nd 96 3.0 Cu, 1.0 Re 70 140 1030-1000 3rd 98 1.0 Sn, 1.0 Ta 65 120 950-810 4th 99 0.8 Cu, 0.2 Ga 60 135 1040 - 970

Landscapes

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

Claims (5)

  1. Alliage à forte teneur en or à des fins décoratives, consistant en 95 à 99,5 % en poids d'or comme métal de base, le reste consistant en des additions d'au moins deux éléments choisis dans l'ensemble formé par le fer et/ou le germanium et/ou le gallium et/ou l'indium et/ou le cobalt et/ou le cuivre et/ou le rhénium et/ou le tantale et/ou l'étain, à l'exclusion d'un alliage de trois matières, cet alliage comportant au moins 1 % en poids de gallium et au moins 1 % en poids du cuivre.
  2. Alliage selon la revendication 1, comportant des additions de 0,5 à 5 % en poids de fer et/ou de gallium et/ou de cobalt.
  3. Alliage selon la revendication 1, comportant des additions de 0,5 à 5 % en poids de gallium et/ou d'indium et/ou d'étain et/ou de 0,5 à 1% en poids de germanium.
  4. Alliage selon la revendication 1, comportant des additions de 0,5 à 5 % en poids de cobalt et/ou 0,5 à 3 % en poids de rhénium et/ou de tantale.
  5. Alliage selon la revendication 1, comportant des additions de 0,5 % en poids jusqu'à moins de 1 % en poids de gallium et/ou de cobalt et/ou 0,5 à moins de 1 % en poids de cuivre et/ou de rhénium.
EP90101360A 1989-02-09 1990-01-24 Alliage à haute teneur en or pour pièces de bijouterie Expired - Lifetime EP0381994B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3903733 1989-02-09
DE3903733 1989-02-09

Publications (2)

Publication Number Publication Date
EP0381994A1 EP0381994A1 (fr) 1990-08-16
EP0381994B1 true EP0381994B1 (fr) 1995-09-27

Family

ID=6373652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101360A Expired - Lifetime EP0381994B1 (fr) 1989-02-09 1990-01-24 Alliage à haute teneur en or pour pièces de bijouterie

Country Status (2)

Country Link
EP (1) EP0381994B1 (fr)
DE (1) DE59009704D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2780611B2 (ja) * 1993-09-06 1998-07-30 三菱マテリアル株式会社 少量成分の合金化で硬質化した金装飾品材
AT407830B (de) * 1999-09-10 2001-06-25 Degussa Huels Cee Gmbh Hochgoldhaltige, gelbe dentallegierung
DE60105987D1 (de) * 2001-05-30 2004-11-04 Leg Or S R L Goldlegierungen und Vorlegierungen zu deren Herstellung
WO2014087216A1 (fr) 2012-12-03 2014-06-12 Argor-Heraeus Sa Alliage d'or résistant à la décoloration
CN109182824A (zh) * 2018-10-12 2019-01-11 佛山科学技术学院 一种耐氧化玫瑰金镀层及其制备工艺

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR722290A (fr) * 1930-11-22 1932-03-15 Cartier Alliage contenant de l'or comme principal élément, du cobalt et, au besoin, d'autres additions
DE643568C (de) * 1934-01-21 1937-04-12 W Guertler Dr Verwendung von Gold-Zirkon-Legierungen
FR2155824A1 (en) * 1971-10-08 1973-05-25 Duerrwaechter E Dr Doduco Casting filigree type jewellry by addition of film forming - elements to noble metals for stripping mould material from casting
GB1444350A (en) * 1972-10-03 1976-07-28 Johnson Matthey Co Ltd Dental alloys
DE2803949A1 (de) * 1978-01-30 1979-08-02 Int Gold Corp Ltd Feinkoernige goldlegierungen
DE3709972A1 (de) * 1987-03-26 1988-10-06 Holzer Walter Gold-schmucklegierung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Binary Alloy Phase Diagrams, Second Ed. Vol.1, ASM Int., The Materials Information Society, T. Massalski. *

Also Published As

Publication number Publication date
EP0381994A1 (fr) 1990-08-16
DE59009704D1 (de) 1995-11-02

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