EP2601325A1 - Alliage pour articles en or, bijoux et produits similaires, et produits fabriqués à partir de cet alliage - Google Patents

Alliage pour articles en or, bijoux et produits similaires, et produits fabriqués à partir de cet alliage

Info

Publication number
EP2601325A1
EP2601325A1 EP11755122.6A EP11755122A EP2601325A1 EP 2601325 A1 EP2601325 A1 EP 2601325A1 EP 11755122 A EP11755122 A EP 11755122A EP 2601325 A1 EP2601325 A1 EP 2601325A1
Authority
EP
European Patent Office
Prior art keywords
weight
total amount
gold
alloy
silver
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.)
Withdrawn
Application number
EP11755122.6A
Other languages
German (de)
English (en)
Inventor
Pasquale Bruni Bossio
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.)
Pasquale Bruni SpA
Original Assignee
Pasquale Bruni SpA
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 Pasquale Bruni SpA filed Critical Pasquale Bruni SpA
Publication of EP2601325A1 publication Critical patent/EP2601325A1/fr
Withdrawn legal-status Critical Current

Links

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
    • C22C5/06—Alloys based on silver
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/84—Preparations for artificial teeth, for filling teeth or for capping teeth comprising metals or alloys
    • A61K6/844—Noble metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting

Definitions

  • the present invention relates to an alloy for goldware, jewellery and similar products, and more specifically to a gold alloy for goldware, jewellery and similar products.
  • gold is a precious metal typically used in jewellery and goldsmithing for the production of necklaces, rings, charms, bracelets, and the like.
  • pure gold known as 24 carat gold
  • 24 carat gold is easy to work but has the disadvantage of being susceptible to damage because it is relatively "soft", that is to say highly malleable, and therefore has little resistance to shear forces. Consequently, gold alloys with purities varying between 9, 14 and 18 carats are normally used.
  • carat has a different meaning from that of the unit of weight used for gems and pearls, being used as a measure of "purity” to quantify the proportion of gold on a 24/24 basis.
  • a carat is equivalent to one part of gold in 24 parts of metal constituting the alloy.
  • 18 carat signifies that an alloy contains 18 parts of fine gold and 6 parts of other alloying metals.
  • the term “carat” is abbreviated to "ct” or "kt”, or commonly to the single letter “k”, often following the number with no intervening space, for example 18k.
  • Gold of maximum purity is therefore described as 24 carat (24 parts of "fine” gold out of a total of 24) and is denoted by the symbol 24k.
  • the remainder of the alloy is typically composed of alloying metals, usually comprising silver and copper.
  • the minimum content of gold in an alloy is 9 carat, which is considered to be the minimum level required in an ornamental article in order to impart satisfactory colour tone and brilliance of the gold.
  • JP2000192170 describes a low-carat corrosion-resistant gold alloy of enhanced golden color with non-blackening casting skin, the principal components whereof are gold 2-30%, palladium 15-35%, indium 5-22%, copper 0.5 -12%, zinc 0.1 - 10% and a balance of silver.
  • This low-carat gold alloy is particularly used as a cast gold alloy for dental crowns and for general decorative application.
  • JP2000192170 discloses specifically a previously known alloy consisting of 5% Gold, 30% Palladium, 40% Silver and 25% Copper, but noted that the casting skin colour at casting and resistance to discoloration and corrosion were inferior. It taught to overcome these problems by alloying with indium and increasing the gold content to a percentage ranging from 12 to 16. An alternative way to deal with these problems would be to plate with high-carat gold.
  • the object of the present invention is therefore to provide an alloy with a low gold content which resolves the aforesaid problems, and which has a colour tonality comparable to that of a high-purity gold alloy while also having good physical and chemical characteristics.
  • Another object of the present invention is to provide an alloy with a low gold content which is not subject to changes of colour over time, and which does not vary in brilliance over time.
  • a further object of the present invention is to provide an alloy with a low gold content which has good workability combined with a low production cost, and which is therefore of considerable commercial value.
  • Yet another object of the present invention is to permit the manufacture of articles of jewellery which are larger and more portable because of the lower weight of the metal.
  • An even further object of the present invention is to provide an alloy which has attractive colour change to the light exposure.
  • the prior art discloses a galvanic treatment in order to make the object resistant against the blackening effect.
  • the inventive one carat gold alloy does not require any treatment on the surface of the metal, due to the fact the primary objective of the invention is to create an alloy which allows the surface of the object to change colour according to the light exposure. With daylight it will assume a light pink tone, almost white, while with low light it will become an intense pink.
  • the main principle of the invention is that the combination based on one carat gold and various other alloying elements with no additional surface treatment such as plating, can create a different range of colours based on the light irradiation of the moment, either natural or artificial light. Brief description of the invention
  • the present invention provides an alloy for goldware, jewellery or the like product consisting of:
  • one or more further components in a total amount up to 3 weight % in particular a catalyst such as borax in a total amount from 0.02 to 0.05 weight %, and/or, in a preferred embodiment, platinium in a total amount from 0.05% to 1% or from 0.1 to 1 weight %.
  • a catalyst such as borax in a total amount from 0.02 to 0.05 weight %
  • platinium in a total amount from 0.05% to 1% or from 0.1 to 1 weight %.
  • silver is in total amount from 60 to 68 weight %, and palladium is in total amount from 8 to 15 weight %.
  • silver is in total amount from 30 to 38 weight %, preferably 35-36 weight %
  • palladium is in total amount from 28 to 35 weight %, preferably 29-30 weight %
  • indium is in total amount from 25 to 32 weight %, preferably 29-31 weight %.
  • silver is in a total amount from 50 to 55 weight % and palladium is in a total amount from 15 to 20 weight %.
  • silver is in a total amount from 40 to 50 weight %
  • palladium is in a total amount from 20 to 30 weight % and possibly from 25 to 30 weight %
  • the element(s) selected from iridium, copper, zinc, nickel, and silicon can be in a total amount from 20 to 25 weight %, the most usual preferred alloying element from this group being copper.
  • gold is advantageously in a total amount from 4.16 to 4.18 weight %, typically 4.16 weight %.
  • a gold cylinder was produced, with a net weight of 20 grams, rated at 1 ct gold (in practice, the eighteenth part of the gold normally contained in an alloy with a millesimal fineness of 750, known as an 18 ct alloy).
  • the cylinder produced in this way showed evident defects in the form of incomplete mixing of the two metals. Although the silver and gold had melted together, they had remained almost completely separate, as demonstrated by the coloration of the cylinder which had clearly distinct yellow and white areas.
  • a second experimental melt was carried out, using an induction furnace and graphite crucible, with a mixture of the following elements: - gold: from 4.16% to 4.18% by weight with respect to the total weight of the mixture;
  • the result was a cylinder of 1 ct gold with a net weight of approximately 25 grams.
  • the resulting cylinder shows a considerable uniformity of mixing of the two principal metals (gold and silver). The silver and gold had completely melted into each other. The coloration of the cylinder was uniform and did not show any markedly distinct areas of colour.
  • Example 2 A third experimental melt was carried out, using an induction furnace and graphite crucible, with a mixture of the following elements:
  • a fourth experimental melt was carried out, using an induction furnace and graphite crucible, with a mixture of the following elements:
  • a fifth experimental melt was carried out, using an induction furnace and graphite crucible, with a mixture of the following elements:
  • Another advantage is the greater portability of articles to be worn, especially in the case of large objects, due to the lower weight of the metal. Indeed, the specific weight of 24 carat gold is 19.25 g/cm 3 , whereas the specific weight of 1 carat gold is approximately 10 g/cm 3 .
  • Another advantage is that the resulting articles, while having a lower percentage of gold, have the same optical characteristics as the original 18 carat gold from which they were produced.
  • the invention can be used for both yellow gold and white gold, and also for all types of coloured gold (yellow, white, red, green, black, etc.). It is clear from the above description that the invention is not limited to the embodiments which are described herein purely by way of non-limiting examples, but can be considerably varied and modified in its entirety and in respect of its details, especially as regards construction and the use of technical and functional equivalents, in order to meet specific requirements of manufacturing and use and to facilitate these processes, without departure from the guiding principle described above and claimed below.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Plastic & Reconstructive Surgery (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Adornments (AREA)
  • Cosmetics (AREA)

Abstract

La présente invention concerne un alliage pour articles en or, bijoux ou produits similaires, composé : d'or dans une quantité totale allant de 4 à 4,5 % en poids ; d'argent dans une quantité totale allant de 35 à 68 % en poids ; de palladium dans une quantité totale allant de 8 à 30 % en poids ; d'au moins un élément choisi parmi l'iridium, le cuivre, le zinc, le nickel, et le silicium dans une quantité totale allant de 18 à 32 % en poids ou d'indium dans une quantité totale allant de 25 à 32 % en poids, et éventuellement au moins un autre constituant dans une quantité totale allant jusqu'à 3 % en poids.
EP11755122.6A 2010-08-04 2011-08-03 Alliage pour articles en or, bijoux et produits similaires, et produits fabriqués à partir de cet alliage Withdrawn EP2601325A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITAL2010A000004A IT1401401B1 (it) 2010-08-04 2010-08-04 Lega per articoli di oreficeria, gioielleria e simili e prodotti ottenuti con tale lega.
PCT/IB2011/001809 WO2012017299A1 (fr) 2010-08-04 2011-08-03 Alliage pour articles en or, bijoux et produits similaires, et produits fabriqués à partir de cet alliage

Publications (1)

Publication Number Publication Date
EP2601325A1 true EP2601325A1 (fr) 2013-06-12

Family

ID=43587381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11755122.6A Withdrawn EP2601325A1 (fr) 2010-08-04 2011-08-03 Alliage pour articles en or, bijoux et produits similaires, et produits fabriqués à partir de cet alliage

Country Status (3)

Country Link
EP (1) EP2601325A1 (fr)
IT (1) IT1401401B1 (fr)
WO (1) WO2012017299A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2571013C1 (ru) * 2014-09-29 2015-12-20 Юлия Алексеевна Щепочкина Сплав на основе серебра
CH714879B1 (fr) 2018-04-12 2022-02-15 Fabrice Thueler Alliage à base de cuivre pour orfèvrerie, bijouterie, horlogerie et produits réalisés à partir de cet alliage.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000192170A (ja) * 1998-12-25 2000-07-11 Nippon Shiken Kogyo Kk 鋳造体の鋳肌が黒色化しない低カラットで黄金色を強化した耐食性金合金
FR2791363B1 (fr) * 1999-03-25 2003-09-26 Kyocera Corp Alliage d'argent et objet decoratif le contenant
DE20216612U1 (de) * 2001-10-01 2003-03-20 Wegold Edelmetalle Ag Silberhaltige Dentallegierung
JP2005163160A (ja) * 2003-12-05 2005-06-23 Pc Wave:Kk 宝飾装身具用銀合金
US20100047618A1 (en) * 2008-08-21 2010-02-25 Seno Jewelry, LLC Precious metal composition, method and article of jewelry comprising same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012017299A1 *

Also Published As

Publication number Publication date
ITAL20100004A1 (it) 2012-02-05
IT1401401B1 (it) 2013-07-26
WO2012017299A1 (fr) 2012-02-09

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