CN117248138A - Red gold alloy for target and application thereof - Google Patents

Abstract

The invention discloses a red gold alloy for a target and application thereof, wherein the red gold alloy for the target comprises 15-19% of Cu, 0.05-0.5% of Ru and 0.05-0.2% of Ga, and the mass ratio of Ge to Cu is 1: 100-2:100, and the balance of Au and other unavoidable impurity elements. The red gold alloy for the target material has small solidification and crystallization interval, fine cast grain structure, no obvious casting defects such as air holes, inclusions and the like, can obtain very compact structure after rolling and pressing, and meets the requirement of the internal structure of the target material.

Description

Red gold alloy for target and application thereof

Technical Field

The invention relates to the technical field of alloys, in particular to a red gold alloy for a target and application thereof.

Background

Rose gold is a gold alloy with red color, and compared with gorgeous gold and low-tone platinum, the rose gold is elegant and attractive in color, gorgeous and elegant, becomes fashion in the current international jewelry industry, and especially accords with the aesthetic of Chinese. Those skilled in the art assign a romantic name to such materials, called rose gold, based on their unique colors, representing a perpetual theme, love, to humans. The rose gold ornament is a brand new world of noble metal ornaments in the unique style and culture of the rose gold ornament, and becomes a new pet for fashionable people. Many internationally well known jewelry timepiece brands, such as Titoni, cartier, jaeger-LeCoultre et al, have, without exception, introduced a number of families of rose gold jewelry and watches, which have led to fashion in the fashion of rose gold fashion worldwide. Besides the use of rose gold in jewelry bodies, the industry also widely uses the rose gold as a plating material of artistic ornaments, and the most widely used rose gold is electroplated. The plating method is alloy plating of Au-Cu binary alloy, and the plating layer is brighter and vivid in color and good in appearance effect. However, the most prominent problem in the rose gold electroplating process is the environmental hazard problem, and in order to obtain excellent plating effect, the rose gold plating liquid system mainly adopts potassium aurous cyanide as main salt and potassium cyanide as complexing agent, and the plating liquid has excellent dispersing capability and deep plating capability, and can obtain fine and uniform plating layers. However, cyanide is a highly toxic chemical and causes serious damage to both operators and the environment. The use of cyanide in electroplating production is limited in the clear in China, and the industry is struggling to develop a cyanide-free and cyanide-free gold alloy electroplating solution system. At present, a plurality of systems such as sulfite plating solution, citrate plating solution and the like are used, but the problems of poor plating solution stability, unsatisfactory plating effect and the like exist. In fact, both cyanide-free and cyanide-free baths deposit a coating on the surface of the jewelry by electroplating. Electroplating belongs to a typical production mode with high energy consumption, high pollution and low efficiency, and has the problems of small production scale, scattered operation points, behind technology, low industrial grade, great potential safety hazard and the like.

The industrial letter department of 2015 makes 'standard conditions of electroplating industry' to promote industrial structure adjustment and transformation upgrading of electroplating industry. The environmental protection department in 2017 issues national standard of pollution discharge license application and nuclear emission technical specification electroplating industry, and many places do not examine and approve newly-established and processed electroplating projects, and the monitoring and disposal forces of the existing electroplating enterprises are continuously coded. The year 2021, month 11, in the "fourteen five" industry green development program (division of industrial information, no. 2021, no. 178) has more specifically proposed to continue the advancement of green products, green plants, green industrial parks, and green supply chain management enterprise construction. It can be expected that environmental protection management will be tighter and tighter in the future, the stringent inspection will be the normalization, the electroplating production mode of the dispersed and extensive jewelry industry faces serious challenges, and new technology for green and environmental protection jewelry coating is urgently required. The vacuum magnetic control sputtering film plating belongs to a new generation of surface treatment technology, and is characterized by that under a certain vacuum condition, argon gas is ionized, under the action of electric field the argon ion can be accelerated to bombard target material, and a large quantity of target material atoms can be sputtered, and deposited on the substrate to form film. The film plating process has the advantages of high sputtering rate, good film forming uniformity, controllable film thickness, strong binding force with a substrate, no pollution and the like, and is widely applied to the fields of aerospace, electronics, optics and the like. In recent years, a magnetron sputtering coating process is introduced into the jewelry industry, a sputtering target is a key raw material for preparing a film by magnetron sputtering, and the quality of the sputtering target is one of key factors for determining the performance of the film. However, the available noble metal sputtering targets in the market at present are few, and the rose gold sputtering targets suitable for jewelry coating decoration requirements are very deficient. The rose gold used for manufacturing jewelry on the market is not suitable for being directly used as a target material, and the main reasons are as follows: firstly, in the aspect of color formation, 14K and 18K are the most widely used color formation, the standard gold content is 58.3% and 75% respectively, and the other alloy elements mainly comprise copper, and the color of the alloy is regulated by the copper content. Because copper has unstable chemical property and poor corrosion resistance and weather resistance, rose gold is easy to be tarnished and discolored in use, and the appearance effect of the product is seriously deteriorated; secondly, the rose gold has poor color and insufficient brightness, looks deep, and influences the fashion of the product; thirdly, the existing material is easy to inhale and oxidize during smelting and casting, the crystallization interval is larger, defects such as air holes, oxide inclusions, loose tissues and the like are easy to occur during casting, the target material is required to have high compactness, and the casting defects can deteriorate the coating effect of the target material; fourth, the existing rose gold material is mostly used for casting molding, has poor cold processing performance and cannot meet the cold processing requirement of the target material.

At present, the commonly used rose gold sputtering target material in the market is wider in Au85Cu15, the material is simple in composition and relatively convenient to manufacture, but the physical, chemical and mechanical properties of the material are not ideal, the color is dull, the material is also not good enough in the aspects of high-temperature oxidation resistance, weather resistance, corrosion resistance and the like, the hardness is low, the performance of a film plated by the material is poor, the brightness of the film is low, the tarnish and color change easily occur in the use process, the wear resistance is insufficient, even the problems of color change, tarnish and the like easily occur, and a part of researchers develop related researches and report some research results aiming at the condition of lack of the rose Jin Jian target material in the current market. For example, patent CN101358331 discloses a magnetron sputtering rose gold target and a preparation method thereof, the chemical composition of which is: 65 to 78 weight percent of gold, 16 to 33 weight percent of copper, 0.01 to 4 weight percent of yttrium, 1 to 7 weight percent of zinc, 0.001 to 1.2 weight percent of cobalt, 0.001 to 0.2 weight percent of antimony and 0.02 to 5 weight percent of indium. However, the red color of the sputtering target is too light, the color formation of gold is also low, and harmful heavy metal elements are contained. Patent CN102703751a discloses a low gold content rose gold target for vacuum magnetron sputtering and a preparation method thereof, wherein the target comprises 50-60 wt.% Au, 30-42 wt.% Cu, 1.4-5.0 wt.% Zn, 0.5-4.0 wt.% Al, 1.0-3.7 wt.% In, 0.1-1.3 wt.% Co, and 0.05-1.5 wt.% Y. The rose gold target material has gold content of only 50-60 wt.% Au, and is not suitable for being used as a surface coating film of high-medium-color jewelry, and the material has light color, poor casting and processing performances, is easy to generate oxide inclusion and affects the quality of the coating film. Patent CN104032273A discloses a color-change-resistant rose gold target and a preparation method thereof, wherein the chemical composition of the target comprises 65-75wt% of Au, 15-35wt% of Cu, 4-10wt% of Ir and 0-2wt% of additive components. Ir is used for replacing Ag to improve the wear resistance and oxidation resistance of the film, however, a macro amount of Ir is easy to cause a segregation phenomenon in the alloy, so that the film is uneven in color and easy to cause variegated spots and other problems. Patent cn109182824A discloses a rose gold coating and a preparation process thereof, wherein the rose gold coating comprises the following components: 12 to 20 weight percent of Cu, 5 to 15 weight percent of Pd, 0.5 to 0.7 weight percent of Er, 0.1 to 0.2 weight percent of Nd0, and the balance of Au; the content of palladium in the rose gold is high, obvious bleaching effect is generated on the alloy, the red color of the alloy is affected, and the brittleness of the alloy is obviously increased due to the high content of rare earth elements.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a red gold alloy for a target material, which has small solidification and crystallization interval, fine cast grain structure, no obvious casting defects such as air holes, inclusions and the like, and can obtain a very compact structure after rolling and pressing, thereby meeting the requirement of the internal structure of the target material.

The second purpose of the invention is to provide a method for preparing rose gold ornaments by applying the red gold alloy for the target material in vacuum magnetic control sputtering.

The invention aims at adopting the following technical scheme:

the red gold alloy for the target comprises the following components in percentage by weight:

15-19% of Cu, 0.05-0.5% of Ru, 0.05-0.2% of Ga, and the mass ratio of Ge to Cu is 1: 100-2:100, and the balance of Au and other unavoidable impurity elements.

The Au-Cu binary alloy is based on the Au-Cu binary alloy, the elements such as Ru, ga, ge and the like are matched, so that the solidification and crystallization interval of the alloy is small, the cast grain structure is fine, casting defects such as obvious pores and inclusions are avoided, a very compact structure can be obtained after rolling, the internal structure requirement of a target is met, and a film is coated on the surface of a jewelry product through a vacuum magnetron sputtering process.

The idea of the invention is as follows: (1) The target material is a material source of the decorative film layer, and the physical property, chemical property, mechanical property, processing property and the like of the film layer depend on the chemical composition and microstructure of the material. (2) The color is one of the most important physical properties of the decorative film, gold and copper are the only two colored elements among all metal elements, copper is red purple and is an essential element for obtaining red, therefore rose gold for sputtering targets is neededGold-copper is based, but both of the metals are deep in color and insufficient in brightness, and cannot meet the vivid fashion sense of jewelry film, so that elements capable of improving the brightness of the alloy must be added. (3) Gold-copper alloys have poor corrosion resistance and are prone to tarnishing and discoloration in the atmosphere, and it is necessary to add alloying elements that form a dense protective layer on the surface to improve the corrosion resistance of the film. (4) The gold-copper alloy is liable to generate pores during casting and to form dispersed oxide inclusions, which affect the surface quality of the target, and therefore, the addition is required to contribute to improvement. The gold-copper alloy has ordered transformation, especially in the composition range close to 18K, and Au is easy to form ₃ Cu is ordered phase, resulting in brittleness of the material, deteriorating its deformation processability. Therefore, in the development of rose gold, it is necessary to add an alloy element to the gold-copper system, which can improve the microstructure, hardness, corrosion resistance and brightness of the material, and to provide the alloy with good overall properties.

The specific technical principle is as follows:

1. gold (Au). Is the basic component element of rose gold, and the content determines the color forming and performance of the target material. Gold is golden yellow, belongs to warm tone, and is the basis for forming rose gold through the blending of gold and copper. Meanwhile, as a decorative protection film layer, in order to ensure that the target material meets the film coating color forming requirements of most jewelry, excellent corrosion resistance is obtained, and the gold content cannot be too low. Through a large number of experiments, the invention discovers that when the gold content is lower than 70wt%, the color difference reaches 3.3 after the alloy is soaked in human sweat for 24 hours, and the alloy belongs to the color change degree which is easy to distinguish by naked eyes. With the increase of the gold content, the corrosion resistance of the alloy in sweat of human body is improved, and when the color reaches 18K, the alloy is easy to be orderly converted to cause brittleness, and the processability is affected. Further increasing the gold content, further improving the corrosion resistance of the alloy and correspondingly reducing the embrittlement tendency of the ordered transition. However, when the gold content exceeds 86wt%, the color of the material is too yellow, the red requirement is not met, the hardness of the material is low, the wear resistance of the film layer is not facilitated, and the cost is correspondingly increased. Therefore, the gold content of the alloy is selected to be 80-85 wt%, such as 80wt%, 82wt%, 84wt% and 85wt%.

2. Copper (Cu). Is a basic alloy element for obtaining red, and as the copper content increases, the red-green index a of the alloy increases, so that the alloy looks redder. Therefore, the copper content should not be too low in order for the alloy to attain a sufficient red color. However, copper itself is poor in brightness and corrosion resistance, and is easily tarnished and discolored under the atmosphere, and is more easily corroded and discolored when being subjected to sweat of a human body. In addition, copper tends to be oxidized by gettering during smelting, but castings are prone to porosity and oxide inclusions. According to a large number of experiments, the alloy has lighter red color and poor decorative effect when the content of copper is lower than 15wt% for the gold-copper alloy with the gold content of 80 wt%; and when the copper content is higher than 19wt%, the alloy tends to be more brittle due to ordered transformation, and pores and oxide inclusions are liable to occur during melting. The invention thus finally selects copper contents of 15 to 19 wt.%, such as 15 wt.%, 16 wt.%, 17 wt.%, 18 wt.%, 19 wt.%.

3. Germanium (Ge). Germanium is added into the gold-copper alloy, so that the brightness of the alloy can be increased, the smelting casting performance is improved, and the air suction oxidation is reduced. Experiments in the invention show that the content of germanium needs to be determined according to the content of copper, and the ratio of germanium to copper is lower than 1: the effect of germanium on colour and metallurgical quality is not evident at 100, whereas when the germanium to copper ratio is higher than 2: at 100, the alloy may be reduced in red and the cast ingot may be at risk of brittleness and oxide inclusions. Thus, the invention ultimately selects a germanium to copper ratio of 1: 100-2:100, such as 1:100,1.2:100,1.4:100,1.5:100,1.6:100,1.8:100,2:100.

4. ruthenium (Ru). Ruthenium has high melting point and good chemical stability, and can obviously refine grains when being added into gold-copper alloy with noble metal, improve the surface quality of the alloy and simultaneously have good effect of improving the brightness of the alloy. Experiments of the invention show that when the ruthenium content is less than 0.05wt%, the effect is not outstanding; when the content exceeds 0.5wt%, defects such as segregation and hard spots are likely to occur, the uniformity of alloy components is affected, and the smelting difficulty is increased. Thus, the final ruthenium content of the present invention is selected to be 0.05 to 0.5wt%, such as 0.05wt%, 0.08wt%, 0.1wt%, 0.12wt%, 0.15wt%, 0.2wt%, 0.25wt%, 0.3wt%, 0.35wt%, 0.4wt%, 0.45wt%, 0.5wt%. Preferably, the ruthenium content is from 0.08 to 0.45% by weight.

5. Gallium (Ga). Gallium can form a compact oxide film on the surface, has excellent oxidation resistance and corrosion resistance, and has excellent brightness improvement effect. More importantly, experiments show that the plating layer contains a trace amount of gallium, so that the antibacterial activity of the plating layer can be obviously improved, and the aims of sterilization and bacteriostasis are achieved by interfering bacterial metabolism. However, when the gallium content is too high, the solidification and crystallization interval of the alloy increases, which is unfavorable for densification of the solidification structure of the ingot. Thus, the final gallium content of the present invention is selected to be in the range of 0.05 to 0.2wt%.

In conclusion, through combining the performances of the materials, according to the special requirements of jewelry product coating on decoration, safety, wear resistance and corrosion resistance, based on Au-Cu binary alloy, the components, tissues and performances of the Au-Cu binary alloy are comprehensively regulated and controlled through multi-element alloying from the aspects of physical performance, chemical performance, mechanical performance, processing performance and the like, so that the material composition is designed.

Further, the red gold alloy for the target comprises the following components in percentage by weight:

17-19% of Cu, 0.2-0.45% of Ru, 0.1-0.2% of Ga, and the mass ratio of Ge to Cu is 1: 100-2:100, and the balance of Au and other unavoidable impurity elements.

Further preferably, the mass ratio of Ge to Cu is 1.5: 100-2:100.

Further, the red gold alloy for the target comprises the following components in percentage by weight:

15-17% of Cu, 0.08-0.2% of Ru, 0.05-0.1% of Ga, and the mass ratio of Ge to Cu is 1: 100-2:100, and the balance of Au and other unavoidable impurity elements.

Further preferably, the mass ratio of Ge to Cu is 1: 100-1.5:100.

One of the purposes of the invention is realized by adopting the following technical scheme:

the red gold alloy for the target comprises the following components in percentage by weight:

17% Cu,0.2% Ru,0.1% Ga, the mass ratio of Ge to Cu is 1.5:100, the balance being Au, and other unavoidable impurity elements.

One of the purposes of the invention is realized by adopting the following technical scheme:

the red gold alloy for the target comprises the following components in percentage by weight:

15% Cu,0.45% Ru,0.2% Ga, the mass ratio of Ge to Cu is 2:100, the balance being Au, and other unavoidable impurity elements.

One of the purposes of the invention is realized by adopting the following technical scheme:

the red gold alloy for the target comprises the following components in percentage by weight:

19% Cu,0.05% Ru,0.05% Ga, the mass ratio of Ge to Cu is 1:100, the balance being Au, and other unavoidable impurity elements.

One of the purposes of the invention is realized by adopting the following technical scheme:

the red gold alloy for the target is characterized by comprising the following components in percentage by weight:

15-19% of Cu, 0.08-0.45% of Ru, 0.05-0.2% of Ga, and the mass ratio of Ge to Cu is 1: 100-2:100, and the balance of Au and other unavoidable impurity elements.

Further, in the above scheme, the total content of the other unavoidable impurity elements is not more than 0.1wt%.

The second purpose of the invention is realized by adopting the following technical scheme:

an application of the red gold alloy for the target is applied to the preparation of rose gold ornaments.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the special requirements of jewelry product coating on decoration, safety, wear resistance and corrosion resistance, the components, the structure and the performance of the alloy are comprehensively regulated and controlled through multi-element alloying based on Au-Cu binary alloy from various aspects such as physical performance, chemical performance, mechanical performance and processing performance, the obtained red gold alloy for the target has small solidification and crystallization interval, small cast grain structure, no obvious casting defects such as air holes and inclusions, and the like, and can obtain a very compact structure after rolling and pressing, thereby meeting the internal structure requirement of the target.

2. The color forming of the red gold alloy for the target is not lower than 18K, the component requirements of most K gold are met, and the color is superior to the standard 5N color. The film layer has excellent wear resistance, corrosion resistance and antibacterial property.

Drawings

FIG. 1 is a microstructure of the surface topography of an ingot of the alloy of example 3;

FIG. 2 is a microstructure of the surface topography of an ingot of the alloy of comparative example 1;

FIG. 3 is a metallographic structure diagram of the alloy of comparative example 1 after rolling;

FIG. 4 is a metallographic structure diagram of the alloy of example 1 after rolling;

FIG. 5 is a graph showing the reflectance of the alloy materials of example 1 and comparative example 1 against visible light;

FIG. 6 is a graph showing the impedance values of the test pieces of example 1 and comparative example 1 in artificial sweat;

FIG. 7 is a Tafil plot of the test pieces of example 1 and comparative example 1 in artificial sweat;

FIG. 8 is a graph showing the impression of targets made of the alloys of example 1 and comparative example 1 after sputter coating.

Detailed Description

The present invention will be further described with reference to the following specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below. In the following examples, au, cu, ru, ga, ge was a pure metal material having a purity of 99.5% or more.

Example 1

The red gold alloy for the target comprises the following chemical components in percentage by mass: 17% Cu,0.2% Ru,0.1% Ga, content ratio of Ge to Cu is 1.5:100, the remainder being Au, and other unavoidable impurities.

Example 2

The red gold alloy for the target comprises the following chemical components in percentage by mass: 15% Cu,0.45% Ru,0.2% Ga, content ratio of Ge to Cu is 2:100, the remainder being Au, and other unavoidable impurities.

Example 3

The red gold alloy for the target comprises the following chemical components in percentage by mass: 19% Cu,0.05% Ru,0.05% Ga, content ratio of Ge to Cu is 1:100, the remainder being Au, and other unavoidable impurities.

Comparative example 1

One alloy is Au85Cu15 red gold (the most commonly used alloy on the market).

Performance testing

The performance of each example versus the comparative example is compared as follows:

1. crystallization temperature interval

The samples of example 1 and comparative example 1 were tested for poor thermal properties using a differential thermal analyzer, and the results are shown in Table 1.

Table 1 melting temperatures of example 1 and comparative example 1

From the above table 1, it can be derived that the melting temperature range of example 1 is smaller than that of comparative example 1. In general, the smaller the melting temperature range, the more advantageous the flow and solidification feed of the molten metal, improving the casting process performance. Thus, example 1 is advantageous in obtaining excellent casting quality when casting a target ingot. The other two embodiments are also very similar to embodiment 1.

2. High temperature oxidation resistance

The ingots of the example 3 and the comparative example 1 were heated to 700 ℃, and after heat preservation for 30min, water was quenched, and the surface morphology of the ingots is shown in fig. 1 and 2.

As can be seen from fig. 1 and 2, the sample of comparative example 1 was heated to have a severe surface oxidation, and a continuous black oxide film was formed, which was not likely to be detached. The surface of example 3 had only the black oxide film fragments of the star and was easily peeled off. The other two embodiments are also very similar to embodiment 3.

3. Density change before and after rolling

By adopting the same rolling conditions, the density of the cast ingot of the comparative example 1 is improved by 1.35% compared with that of the cast ingot after rolling deformation with the accumulated rolling amount of 75%, and the density of the cast ingot of the example 2 is only improved by 0.87% compared with that of the cast ingot after rolling, which shows that the cast ingot of the example 2 has better density and provides a good foundation for the production of the target material.

4. Microstructure of microstructure

The metallographic structures of comparative example 1 and example 1 after rolling are shown in fig. 3 and 4 using the same rolling conditions.

As can be seen from FIGS. 3 and 4, the crystal grains of example 1 were finer than those of comparative example 1, and no significant pores and oxide inclusions were observed, exhibiting excellent metallurgical quality. The other two embodiments are also very similar to embodiment 1.

5. Color of

The reflectance of the red gold alloy material of example 1 and comparative example 1 to visible light is shown in fig. 5.

As can be seen from FIG. 5, the reflectance of the alloy material of example 1 was higher in the 360 to 520nm band and the 610 to 740nm band than in comparative example 1, and the reflectance in the 530 to 600nm band was substantially the same as in comparative example 1. Obviously, the brightness value of the alloy material of example 1 is improved, and the chromaticity value is basically close, so that when the alloy material of example 1 is used as a sputtering target material, the brightness of the plated film layer is high, and the fashion sense of the film layer is obviously improved. The other two embodiments are also very similar to embodiment 1.

6. Corrosion resistance

The impedance and polarization curves (tafel plots) of the test pieces of example 1 and comparative example 1 in artificial sweat were measured using an electrochemical workstation, as shown in fig. 6 and 7, respectively.

As can be seen from fig. 6 and 7, the impedance values of example 1 and comparative example 1 were 47.6kΩ and 45.7kΩ, respectively, and their self-corrosion potentials in artificial sweat were 0.046V and-0.005V, respectively. In addition, the self-etching current of example 1 is significantly smaller than that of comparative example 1. Thus, example 1 has better corrosion resistance in artificial sweat than comparative example 1.

In addition, after the samples of example 2 and comparative example 1 were immersed in artificial sweat for 4 hours, the color difference of example 2 was 1.29, the color difference of comparative example 1 was 1.64, and the resistance to light discoloration of example 2 was 21% higher than that of comparative example 1.

The test pieces of the example 3 and the comparative example 1 are placed in a yellowing-resistant test box, the color difference of the example 3 is 0.27 after the test is carried out for 18 hours under the simulated sun illumination, the color difference of the comparative example 1 is 0.41, and the resistance to the light discoloration of the example 3 is improved by 52 percent compared with the comparative example 1.

5. Wear resistance

The as-cast hardness of example 1 was HV190, and the hardness after 60% rolling was HV260. The cast ingot is manufactured into a target material through a series of processing (a conventional target material manufacturing process), and after sputtering coating, the indentation test result of the film layer is shown in fig. 8.

As can be seen from fig. 8, under the same test conditions, the indentation depth of example 1 was shallower than that of comparative example 1, and the average film hardness of comparative example 1 was calculated to be HV354, whereas the average film hardness of example 1 was calculated to be HV443, showing more excellent abrasion resistance.

6. Antibacterial property

The targets prepared in example 3 and comparative example 1 were used for coating, and the film was subjected to a contact antibacterial test, and the strains were aspergillus flavus and staphylococcus aureus, respectively, as shown in table 2 below.

Table 2 comparison of the antimicrobial properties of sputtered film layers of the targets of example 3 and comparative example 1

The results show that the film layer of example 3 has better antibacterial effect on both species than comparative example 1.

The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.

Claims (10)

1. The red gold alloy for the target is characterized by comprising the following components in percentage by weight:

15-19% of Cu, 0.05-0.5% of Ru, 0.05-0.2% of Ga, and the mass ratio of Ge to Cu is 1: 100-2:100, and the balance of Au and other unavoidable impurity elements.

2. The red gold alloy for a target according to claim 1, which comprises the following components in percentage by weight:

17-19% of Cu, 0.2-0.45% of Ru, 0.1-0.2% of Ga, and the mass ratio of Ge to Cu is 1: 100-2:100, and the balance of Au and other unavoidable impurity elements.

3. The red gold alloy for target according to claim 2, wherein the mass ratio of Ge to Cu is 1.5: 100-2:100.

4. The red gold alloy for a target according to claim 1, which comprises the following components in percentage by weight:

15-17% of Cu, 0.08-0.2% of Ru, 0.05-0.1% of Ga, and the mass ratio of Ge to Cu is 1: 100-2:100, and the balance of Au and other unavoidable impurity elements.

5. The red gold alloy for target according to claim 4, wherein the mass ratio of Ge to Cu is 1: 100-1.5:100.

6. The red gold alloy for the target is characterized by comprising the following components in percentage by weight:

17% Cu,0.2% Ru,0.1% Ga, the mass ratio of Ge to Cu is 1.5:100, the balance being Au, and other unavoidable impurity elements.

7. The red gold alloy for the target is characterized by comprising the following components in percentage by weight:

15% Cu,0.45% Ru,0.2% Ga, the mass ratio of Ge to Cu is 2:100, the balance being Au, and other unavoidable impurity elements.

8. The red gold alloy for the target is characterized by comprising the following components in percentage by weight:

19% Cu,0.05% Ru,0.05% Ga, the mass ratio of Ge to Cu is 1:100, the balance being Au, and other unavoidable impurity elements.

9. The red gold alloy for the target is characterized by comprising the following components in percentage by weight:

15-19% of Cu, 0.08-0.45% of Ru, 0.05-0.2% of Ga, and the mass ratio of Ge to Cu is 1: 100-2:100, and the balance of Au and other unavoidable impurity elements.

10. An application of the red gold alloy for targets according to any one of claims 1 to 9 in the preparation of rose gold ornaments.