CN101255508A - Rear-earth-containing polybasic yellow gold alloy and preparation method thereof - Google Patents

Abstract

In order to improve the mechanical performance, cast performance and processing performance of a yellow gold alloy, the invention provides a rare-earth-containing multi-component yellow gold alloy, which includes four major elements: gold, copper, silver and zinc, the yellow gold alloy also includes one or more elements selected from the three rare earth elements: yttrium, lanthanum and cerium, one or more elements from the additional elements: silicon, boron, indium and cobalt. The rare-earth-containing multi-component white gold alloy is formed by multi-component alloying the composite rare earth, silicon, boron and cobalt, the microstructure of the alloy is improved, the grains are refined, the grain boundary is purified, the mechanical performance and manufacture performance are improved, no noble metal is used for alloying, therefore the cost is relatively low, no harmful elements are used in the alloy, thus no harmful effect are caused to environment or operating personal.

Description

A kind of rear-earth-containing polybasic yellow gold alloy and preparation method thereof

Technical field

The invention belongs to field of metallurgy, relate to a kind of au-alloy that ornaments are made that is used for, relate to a kind of rear-earth-containing polybasic yellow gold alloy particularly.

Prior art

Au-Ag-Cu-Zn series yellow gold alloy is that present ornaments adopt alloy system the most widely with yellow gold alloy, the present yellow gold alloy system of this alloy system exists as brightness not enough in process of production, castability is bad, hardness is on the low side etc., and people have become a focus of ornaments au-alloy research both at home and abroad in recent years by the over-all properties of adding trace element raising ornaments au-alloy.The effect of trace additives can reduce raising intensity; Anti-oxidation; Improve castability; Several aspects such as crystal grain thinning, trace additives also is a very important aspect to the influence of alloy color in addition.

The external the most frequently used trace additives of bibliographical information is silicon and iridium at present. as trace additives, thereby silicon can effectively improve filling properties and surface quality that alloy flowability effectively improves alloy, it makes alloy can directly obtain the surface of light under as cast condition, when silicone content in the au-alloy surpasses solid solubility, tend to cause brittle crack, this also is the major cause that a lot of substandard product of ornaments production produces.In addition, silicon also can cause crystal grain thick, and this not only makes alloy be easy to cracking, but also makes alloy be not easy to polishing.Therefore silicon must use simultaneously with grain-refining agent.Iridium is grain-refining agent the most frequently used in the present au-alloy, there are some researches show: silicon can and iridium reaction generate silicide particle, generation hard cluster and offset its grain refining effect, and influence the surface quality of ornaments.

Summary of the invention

The objective of the invention is to avoid the deficiencies in the prior art part, and provide a kind of have mechanical property, castability and processing characteristics preferably, the yellow ornaments au-alloy that cost is cheap relatively.

The present invention is achieved through the following technical solutions goal of the invention, a kind of rear-earth-containing polybasic yellow gold alloy, comprise gold, copper, silver, four kinds of main elements of zinc, described yellow gold alloy also comprises one or more in yttrium, lanthanum, three kinds of rare earth elements of cerium, also comprise and add in elemental silicon, boron, indium, the cobalt one or more, the weight percent of each element is in the described yellow gold alloy:

Au：75-76％、Ag：10-12％、Zn：2-5％，Cu：8-12％、La：0-0.2％、Ce：0-0.2％、Y：0-0.5％、Co：0-0.3％、B：0-0.1％、Si：0-0.05％、In：0-0.05％。The weight percent of described yttrium, lanthanum, three kinds of rare earth elements of cerium is preferably: Y:0.1-0.5%, La:0.01-0.2%, Ce:0.01-0.2%.

A kind of manufacture method of rear-earth-containing polybasic yellow gold alloy may further comprise the steps:

A, rare earth element yttrium, bright-coloured, cerium and oxygen activity elemental nickel, zinc, silicon, boron, indium, cobalt are made the Cu-Me master alloy with copper respectively;

B, analyze the composition of each master alloy Cu-Me, ratio batching as required, melting is the repaired mouth particle in the jewellery alloy granulating device;

C, according to the corresponding proportion melting au-alloy of required K value with repaired mouth particle and gold.

It is multi-element alloyed that the present invention adopts alloying elements such as compound rare-earth and silicon, boron, cobalt to carry out, and improves alloy organizing, and crystal grain thinning purifies crystal boundary, improves mechanical property and manufacturing property.

The present invention adopts multiple oxygen activity elements such as rare earth element yttrium, lanthanum, cerium and zinc, silicon, boron, indium, cobalt to carry out multi-element alloyed, the oxide compound free energy of these oxygen activity elements is all lower than the oxide compound of copper, stronger with oxygen affinity, can form more stable oxide, thereby suppressed the appearance of the cotton-shaped cupric oxide in the alloy solution, improved the flowability of alloy.Of the present invention by the multiple trace additives of compound interpolation, can play effective solution strengthening effect to alloy, make it have higher hardness, utilize the rare earth element crystal grain thinning and purify crystal boundary, improved the plasticity of alloy, make it to have better machining property.In melting, castingprocesses, alloying element has played effective provide protection, has reduced the air-breathing oxidation of alloy, and cobalt, boron alloy element have improved the wettability of alloy, makes the castability of alloy good.

The invention has the beneficial effects as follows: high comprehensive performance, by regulating the composition of trace additives, the hardness of cast form of alloy can obtain in a big way adjusting to adapt to different demands, and the maximum hardness of alloy can reach 220HV.Alloy has better machining property, castability and welding property, be fit to mechanical workout, hand is made and different making method such as Foundry Production, do not adopt precious metal element to carry out alloying in the alloy, cost is cheap relatively, do not adopt harmful element in the alloy yet, environment and operator are not produced harmful effect.

Embodiment

Embodiment 1

A kind of rear-earth-containing polybasic yellow gold alloy, the weight percent of each element is in the alloy: Ag:10%, Zn:2%, Cu:11%, La:0.01%, Ce:0.01%, Y:0.1%, Co:0.3%, surplus are gold.

A kind of manufacture method of rear-earth-containing polybasic yellow gold alloy may further comprise the steps:

A makes the Cu-Me master alloy with copper respectively with rare earth element yttrium, bright-coloured, cerium and oxygen activity elemental nickel, zinc, cobalt;

B analyzes the composition of each master alloy Cu-Me, ratio batching as required, and melting is the repaired mouth particle in the jewellery alloy granulating device;

C is the au-alloy of required K value according to the corresponding proportion melting with repaired mouth particle and gold.

Embodiment 2

A kind of rear-earth-containing polybasic yellow gold alloy, the weight percent of each element is in the au-alloy: Ag:12%, Zn:2%, Cu:10%, Ce:0.2%, B:0.1%, Si:0.05%, surplus are gold.

A kind of manufacture method of rear-earth-containing polybasic yellow gold alloy may further comprise the steps:

A makes the Cu-Me master alloy with copper respectively with rare earth element yttrium, cerium and oxygen activity element zinc, silicon, boron;

B analyzes the composition of each master alloy Cu-Me, ratio batching as required, and melting is the repaired mouth particle in the jewellery alloy granulating device;

C is the au-alloy of required K value according to the corresponding proportion melting with repaired mouth particle and gold.

Embodiment 3

A kind of rear-earth-containing polybasic yellow gold alloy, the weight percent of each element is in the au-alloy: Ag:12%, Zn:2%, Cu:10%, La:0.1%, Y:0.25%, B:0.1%, Si:0.05%, In:0.05%, surplus are gold.

A kind of manufacture method of rear-earth-containing polybasic yellow gold alloy may further comprise the steps:

A makes the Cu-Me master alloy with copper respectively with rare earth element yttrium, bright-coloured and oxygen activity element zinc, silicon, boron, indium;

B analyzes the composition of each master alloy Cu-Me, ratio batching as required, and melting is the repaired mouth particle in the jewellery alloy granulating device;

C is the au-alloy of required K value according to the corresponding proportion melting with repaired mouth particle and gold.

Embodiment 4

A kind of rear-earth-containing polybasic yellow gold alloy, the weight percent of each element is in the au-alloy: Ag:125%, Zn:2%, Cu:10%, La:0.2%, Ce:0.2%, Co:0.3%, B:0.1%, Si:0.05%, In:0.05%, surplus are gold.

A kind of manufacture method of rear-earth-containing polybasic yellow gold alloy may further comprise the steps:

A, rare earth element bright-coloured, cerium and oxygen activity element zinc, silicon, boron, indium, cobalt are made the Cu-Me master alloy with copper respectively;

B, analyze the composition of each master alloy Cu-Me, ratio batching as required, melting is the repaired mouth particle in the jewellery alloy granulating device;

C, according to the corresponding proportion melting au-alloy of required K value with repaired mouth particle and gold.

Claims (3)

1, a kind of rear-earth-containing polybasic yellow gold alloy, comprise gold, copper, silver, four kinds of main elements of zinc, it is characterized in that: described yellow gold alloy also comprises one or more in yttrium, lanthanum, three kinds of rare earth elements of cerium, also comprise and add in elemental silicon, boron, indium, the cobalt one or more, the weight percent of each element is in the described yellow gold alloy:

Au：75-76％、Ag：10-12％、Zn：2-5％，Cu：8-12％、La：0-0.2％、Ce：0-0.2％、Y：0-0.5％、Co：0-0.3％、B：0-0.1％、Si：0-0.05％、In：0-0.05％。

2, a kind of rear-earth-containing polybasic yellow gold alloy according to claim 1 is characterized in that: the weight percent of described yttrium, lanthanum, three kinds of rare earth elements of cerium preferably: Y:0.1-0.5%, La:0.01-0.2%, Ce:0.01-0.2%.

3, a kind of manufacture method of rear-earth-containing polybasic yellow gold alloy may further comprise the steps:

A, rare earth element yttrium, bright-coloured, cerium and oxygen activity element zinc, silicon, boron, indium, cobalt are made the Cu-Me master alloy with copper respectively;

B, analyze the composition of each master alloy Cu-Me, ratio batching as required, melting is the repaired mouth particle in the jewellery alloy granulating device;

C, according to the corresponding proportion melting au-alloy of required K value with repaired mouth particle and gold.