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INVENTION
Patent of the Russian Federation RU2202644
ALLOY OF WHITE GOLD OF THE GOLD-SILVER-PALLADIUM-ZINC-INDIA SYSTEM
Applicant's name: Kostroma State Technological University
The name of the inventor: Boshin SN; Muromtsev A.V .; Boshin SV; Muromtsev V.V.
The name of the patent holder: Kostroma State Technological University
Address for correspondence: 156005, Kostroma, ul. Dzerzhinsky, 17, KSTU, Pat. Department, R.V. Korabelnikov
Date of commencement of the patent: 2002.06.10
The invention relates to non-ferrous metallurgy, foundry and powder manufacture, in particular to the issue of obtaining gold-based alloys for the manufacture of jewelry products.
The object of the invention is to increase the physical and mechanical properties, expand the temperature range of the alloy melting and improve its jewelry properties. This gold-based alloy additionally contains zinc and indium with the following component ratio, wt. % : Silver 25,0-26,0 , palladium 11,5-10,0 , indium 3,5-4,0, zinc 1,5-1,0, gold 58,5-59,0 . The technical result of the invention is that it can be used for the manufacture of jewelry and art products by increasing the physical and mechanical properties, extending the melting temperature range of the proposed alloy.
DESCRIPTION OF THE INVENTION
The invention relates to the field of non-ferrous metallurgy, foundry and powder manufacture, in particular to the issue of obtaining gold-based alloys for the manufacture of jewelry products.
There is a known alloy of the gold-silver-palladium-nickel system, ZlSrPdN 750-90-140 (chemical composition, mass%: gold 74.7-75.3, silver 8.5-9.5, palladium 13.5-14 , 5, nickel 1.7-2.3), TU 48-1-265-86 "Strips made of gold alloys of 750 tests".
The alloy is quite expensive, has insufficiently high mechanical properties.
The alloy of the gold-silver-palladium-indium system ZlSrPd 750-30-30 (chemical composition, mass%: gold 74.7-75.3, silver 2.5-3.5, palladium 2.5-3, 5, indium 1,5-2,5), TU 117-1-290-91 and TU 117-1-291-91 "Strips of the alloy ZlSrM 750-150, ZlSrPd 750-30-30" and "Alloy wire Grades ZlSrPd 750-30-30 ".
The alloy has a high cost and insufficiently high physical and mechanical characteristics.
The alloy of the gold-silver-copper-zinc-cadmium system ZlSp 750-87 is known (chemical composition, mass%: gold 74.7-75.3, silver 8.2-9.2, copper -ost, zinc 1 , 2-1.8, cadmium 5.7-6.3), TU 48-1-265-86.
The alloy has a high cost and insufficiently high wear resistance.
The most similar in terms of technological essence, quality and color scale is the alloy of white gold-silver-palladium system ZlPdSr 585 (chemical composition, mass%: gold 58.5-59.0, silver 25.0-26.0, palladium 15.0-17.0), TU 48-1-46-84.
The disadvantage of this alloy is its relatively low wear resistance, high cost.
The object of the present invention is to increase the physical and mechanical properties, to expand the temperature range of the alloy melting and to improve its jewelry properties.
The objective is achieved by the fact that a known gold-based alloy containing silver and palladium, in order to increase the physical and mechanical properties and economic efficiency, further comprises zinc and indium with the following component ratio, by weight :
- Silver - 25,0-26,0
- Palladium - 11.5-10.0
- India 3.5-4.0
- Zinc - 1.5-1.0
- Gold - 58.5-59.0
Palladium . Gold and palladium have unlimited solubility in both liquid and solid state. From the addition of palladium and zinc into the composition of the charge in these quantities, the gold alloy acquires a pleasantly white color, has a high plasticity, has a better gloss.
Zinc . The solubility of zinc in the metals of the ternary system is: in gold to 4% , in silver to 20% , in copper to 40% . Pure gold forms already with 5% zinc brittle compound Au 3 Zn , which, however, is not formed in the ternary alloy because of the solubility of zinc in gold, silver and copper, has a deoxidizing effect and increases the fluidity of the alloy.
India . The limiting solubility of indium in gold in the solid state is 9% (at.) , In silver 19% (at.) . Reduces the melting point. It is an alloying additive of white gold .
The proposed alloy of white gold can be used for making jewelry and art products . Can be supplied to the consumer in the form of strips, wires, cast blanks and finished products.
INFORMATION SOURCES
E. BREPOL. Alloys of precious metals. - M: Science, 1977.
E. BREPOL. Theory and practice of jewelry. - L: Mechanical Engineering, 1975.
V.M. Malyshev, D.V. Rumyantsev. Gold. - M: Metallurgy, 1988.
Nomenclature list of products of the Moscow plant for the processing of special alloys.
CLAIM
A white gold alloy containing silver and palladium, characterized in that it additionally contains zinc and indium with the following component ratio, wt. %: Silver 25,0-26,0, palladium 11,5-10,0, indium 3,5-4,0, zinc 1,5-1,0, gold 58,5-59,0.
print version
Date of publication 11/21/2006
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