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 is based on a white gold alloy with gold as necessary first component in a quantity customary for jewelry, with silver as a necessary second component, with manganese as a third necessary component and with other components that are partly necessary and partly optional.
• a white gold alloy with gold as necessary first component in a quantity customary for jewelry, with silver as a necessary second component, with manganese as a third necessary component and with other components that are partly necessary and partly optional.
• Such an alloy is known from DE 43 20 928 C1.
• DE 43 20 928 C1 discloses a 14-carat white gold alloy made from 58.5-60 % By weight gold, 25 - 40.5% by weight silver, 0.5 - 10% by weight manganese, 0.5 - 5% by weight Gallium and / or germanium and with the optional components 0 - 5% by weight Zinc, 0-3% by weight tin, 0-5% by weight indium, 0-10% by weight copper, 0-8 % By weight of iron and 0-1% by weight of ruthenium, rhodium, rhenium and / or iridium.
• DE 43 20 928 C1 discloses one Alloy of 75 - 85% by weight gold, 1 - 20% by weight silver, 0.5 - 10% by weight manganese, 0.5-5% by weight gallium and / or germanium, 0-5% by weight zinc, 0-5 % By weight zinc, 0-3% by weight tin, 0-3% by weight indium, 0-4% by weight copper, 0-4 % By weight of iron and 0-1% by weight of ruthenium, rhodium, rhenium and / or iridium.
• Gallium is used in the alloys known from DE 43 20 928 C1 and the germanium to lower the melting point to the alloy to be able to pour more easily.
• the optional components zinc, tin, indium, copper and Irons are used to influence the color and mechanical properties the alloy, the optional components ruthenium, rhodium, rhenium and iridium serve as grain refiners.
• the present invention has for its object to provide a white gold alloy, which manages with so little nickel that allergic reactions are absent, works best without any nickel, and also does not have to contain palladium to meet the most important requirements for the processability and color of the alloy for To fulfill jewelry purposes.
• Contain white gold alloys according to the invention Gold as the first necessary component and 0.5-10% by weight of manganese in combination with 0.5 - 8 wt .-% chromium as necessary components.
• the gold is in one for Jewelry included common amount.
• the most common white gold alloys have gold contents of 18 carats, 14 carats, 10 carats, 9 carats and 8 carats. Gold contents of 75% by weight, 58.5% by weight are therefore preferred. 41.7% by weight, 37.5% by weight and 33.3% by weight.
• Preferred components are preferred 0 - 14% by weight copper, 0 - 14 wt .-% palladium and one or more other optional components, which together 0-4 % By weight, with silver as the remainder.
• a white gold alloy is preferred, in which the gold content, the imperative components chromium and manganese as well as the optional components copper and palladium and the other optional components taken together less than 100% and the white gold alloy has a silver content.
• Silver is an alloy additive particularly preferred, has an advantageous lightening effect and relieves the processing of the alloy.
• Palladium can be added to the white gold alloy according to the invention in order to Reduce hardness and reduce oxidation when melting, but is this is by no means necessary.
• a white gold alloy according to the invention preferably contains at least 33 Wt% gold.
• the content of manganese, chromium, copper, palladium is preferred and other optional components in total less than 25% by weight, in particular less than 20% by weight.
• the decolorization is below 0.5% chromium and 0.5% manganese Effect too little. Above 8% chromium and 10% by weight % By weight of manganese does not lead to a further improvement in the white coloring, but the cold formability and the polishability of the alloy suffer. optimal Results are achieved with a chromium content of 0.5-3% by weight or also 2-6% by weight and with a manganese content of 1-5% by weight, in particular 1-4 Wt .-%.
• the optional components can be present individually or in combination, they but do not have to be present.
• white gold alloys serve the hue and / or the mechanical properties to optimize the alloy. They can also determine the solubility of the alloy components increase in gold and / or silver and / or copper.
• Iron and tin support the decolorizing effect of the combination of manganese and chrome and are preferably provided in amounts of 1-2% by weight. In these Quantities do not adversely affect the mechanical behavior of the White gold alloys and desirably increase the hardness of the alloy after previous cold working to values of e.g. 200 HV to 240 HV.
• a copper content is suitable, the color of the white gold is slightly warmer make and somewhat increases the hardness of the white gold alloy, which is also easy to deform cold.
• the copper content preferably remains below 8% by weight.
• the usual grain refining additives can be in one Alloy according to the invention in small quantities as required (up to approx. 1 Wt .-%) may be included.
• the alloy according to the invention could also do something for technological reasons Containing palladium, but this is undesirable for cost reasons.
• a preferred 18-carat white gold alloy of the invention contains 75 % By weight of gold and 1-5% by weight, preferably 1-4% by weight and in particular 2-3.5 % By weight of manganese, 2-6% by weight, in particular 4% by weight or 0.5-3% by weight, in particular 1.5% by weight of chromium and 0 - 4% by weight, in particular 1 - 2% by weight
• Optional components from the group containing iron, tin, gallium and indium and the remainder silver, with some of the silver being up to 8% by weight of copper can be replaced.
• the gold content may be that for jewelry alloys usual or permissible deviations from the nominal salary exhibit.
• a particularly suitable 18-carat white gold alloy contains 75% by weight Gold, 3.5% by weight manganese, 1.5% by weight chromium, 0.7% by weight gallium and 9.3 % By weight silver.
• Another particularly suitable 18-carat white gold alloy contains 75 % By weight gold, 2% by weight manganese, 4.3% by weight chromium, 0.7% gallium and 18 % By weight silver.
• These alloys were made using a AuCr18 master alloy melted inductively. Both were suitable as melting pots a graphite crucible as well as a ceramic crucible. The melt was at least Maintained at their temperature for two minutes and then in a steel mold cast. Both alloys had a hardness of 140 after casting HV, which thicken by cold forming, namely by rolling to a 1 mm Sheet metal, rose to 240 HV and after 0.5 hours of intermediate annealing at 750 ° C fell back to 160 HV.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
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• Organic Chemistry (AREA)
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Citations (7)

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• 2000
  • 2000-07-31 DE DE2000138698 patent/DE10038698A1/de not_active Withdrawn
• 2001
  • 2001-07-28 EP EP01118393A patent/EP1178124A3/fr not_active Withdrawn

Patent Citations (7)

Non-Patent Citations (3)

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