A nickel-free white gold alloy for high-temperature enamel jewelry and its preparation method

A white gold alloy and enamel technology, which is applied in the field of nickel-free white gold alloy for high-temperature enamel jewelry and its preparation, can solve problems affecting the color of enamel, bursting, peeling, etc., and achieve excellent high-temperature oxidation resistance, excellent anti-tarnish performance, The effect of excellent cold working properties

Active Publication Date: 2017-04-19
GUANGZHOU PANYU POLYTECHNIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using commercial K platinum to fire transparent enamel, it is easy to have a large number of bubbles on the bottom of the enamel, the enamel surface is hazy, etc., and the serious oxidation of the base metal will also affect the color of the enamel.
When the combination of the fired enamel layer and the metal substrate is not strong enough, problems such as bursting and peeling will occur, especially in the electroplating process.
Once the enamel surface cracks or peels off, it takes a lot of effort to repair, which significantly increases the production cost

Method used

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  • A nickel-free white gold alloy for high-temperature enamel jewelry and its preparation method
  • A nickel-free white gold alloy for high-temperature enamel jewelry and its preparation method
  • A nickel-free white gold alloy for high-temperature enamel jewelry and its preparation method

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preparation example Construction

[0036] The above-mentioned preparation method of the nickel-free white gold alloy for high-temperature enamel jewellery, the steps are:

[0037] 1) Melting the raw materials under a protective atmosphere;

[0038] 2) After all the materials are melted, adjust the temperature of the molten metal and cast to obtain ingots;

[0039] 3) After the ingot is rolled, it is annealed.

[0040] Preferably, step 1) is: under the protection of commercially pure argon, the raw materials are melted in an induction furnace at a melting temperature of 990-1010°C.

[0041] Preferably, in step 2), adjust the temperature of the molten metal to 980-1000°C;

[0042] Preferably, in step 3), the annealing treatment is: annealing at 700-800° C. for 3-10 minutes.

Embodiment 1

[0045] The white gold alloy used for firing high-temperature enamel of the present embodiment is composed of the following components by mass percentage:

[0046] 57.33wt% silver, 0.016wt% scandium, 0.20wt% palladium, 3.06wt% copper, 5.92wt% zinc, 0.030wt% silicon, 0.0006wt% boron, 33.38wt% gold, the balance being unavoidable impurities.

[0047] The preparation method of the present embodiment, the steps are:

[0048] Smelting in a vacuum induction furnace, the mass percentages of the raw materials are: 1.6wt% silver-scandium alloy, 2wt% silver-palladium alloy, 10.5wt% silver-copper alloy, 25.5wt% silver-zinc alloy, 0.6wt% copper-silicon alloy , 24.1wt% pure silver, 2.2wt% copper-zinc alloy, 0.12wt% copper-boron alloy, 33.38wt% pure gold. Roll pure gold and pure silver into thin sheets, wrap silver-scandium alloy, silver-palladium alloy, silver-copper alloy, copper-zinc alloy, silver-zinc alloy, copper-silicon alloy, copper-boron alloy and other materials with it, put them i...

Embodiment 2

[0056] The white gold alloy used for firing high-temperature enamel of the present embodiment is composed of the following components by mass percentage:

[0057] 33.34wt% gold, 57.76wt% silver, 3.76wt% copper, 4.75wt% zinc, 0.30wt% palladium, 0.025wt% silicon, 0.013wt% scandium, 0.0008wt% boron, and other unavoidable impurities.

[0058] The preparation method of the present embodiment, the steps are:

[0059] Smelting is carried out in a vacuum induction furnace, and the mass percentages of the raw materials are: 1.3wt% silver-scandium alloy, 3wt% silver-palladium alloy, 7.3wt% silver-copper alloy, 0.5wt% copper-silicon alloy, 16 wt% silver-zinc alloy , 34.4wt% pure silver, 4wt% copper-zinc alloy, 0.16wt% copper-boron alloy, 33.34wt% pure gold. Put the above materials into the graphite crucible in turn, fill it tightly and close the furnace cover, evacuate to 4.7Pa, and fill it with industrial pure argon to 0.98atm. Start induction heating for smelting, and the smelting te...

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Abstract

The invention discloses a nickel-free white gold alloy for high-temperature enameled jewelry and a preparation method for the nickel-free white gold alloy. The gold alloy consists of the following components in percentage by weight: 33.3-33.5wt% of gold, 56.0-58.0wt% of silver, 3.0-5.0wt% of copper, 4.0-6.0wt% of zinc, 0.2-0.4wt% of palladium, 0.02-0.05wt% of silicon, 0.008-0.02wt% of scandium, 0.0005-0.001wt% of boron and other inevitable impurities. The preparation method comprises the following steps: 1) smelting raw materials under protective atmosphere; 2) after the materials are completely smelted, regulating a temperature of molten metal, and casting the molten metal to obtain cast ingot; and 3) rolling the cast ingot and annealing the rolled cast ingot. The gold alloy disclosed by the invention is free of nickel allergy risk, has excellent high temperature oxidization resistance and tarnish resistance, and a burnt transparent enamel layer has good transparency. The nickel-free white gold alloy is taken as an enamel substrate, and the burnet enamel layer is stable, and is firm in bonding with the substrate; and the nickel-free white gold alloy has excellent cold workability.

Description

technical field [0001] The invention relates to a nickel-free white gold alloy for high-temperature enamel jewelry and a preparation method thereof. Background technique [0002] As a substitute for platinum, white gold alloy (commonly known as K platinum) has the advantages of cheaper price, higher strength, and better processing performance. It has been widely used in inlaid jewelry and has become the main material in gold alloy jewelry. Affected by the market economic environment and people's consumption concepts, 8-10K low-quality K gold began to become popular in the K gold market as fashion jewelry. Since gold is a golden yellow element, in order to effectively bleach the gold alloy, it is necessary to add alloy elements capable of effective bleaching to the alloy. Among all metal elements in nature, although except for a few elements such as Au and Cu, most of the other metal elements are white or gray, but there are very few metals that can be effectively used as bl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/06C22C1/02
CPCC22C1/02C22C5/06
Inventor 袁军平王昶李卫陈绍兴
Owner GUANGZHOU PANYU POLYTECHNIC
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