A method for preparing a brass imitation gold target

Abstract

The application discloses a preparation method of brass gold-imitating target material, wherein pure copper and pure silver are put into an induction melting furnace and heated to 1100-1200 DEG C, pure aluminum and CuSi intermediate alloy are added after the pure copper and the pure silver are completely melted, and the temperature is kept for 1-5 minutes, then pure zinc and rare earth-containing material are added, the temperature is kept for 1-5 minutes after the temperature is reduced to 1000-1100 DEG C, and then the temperature is increased to 1050-1150 DEG C, and then casting is carried out to obtain a block-shaped ingot; the block-shaped ingot is heated to 680-780 DEG C and kept for 20-60 minutes; after being discharged, the block-shaped ingot is immediately subjected to single-pass hot rolling on a hot rolling mill, and the rolling deformation is not more than 30%; the block-shaped ingot is immediately returned to the furnace and heated after the single-pass hot rolling, and kept for 5-15 minutes at 680-780 DEG C; the steps of keeping and hot rolling are repeated until the brass gold-imitating target material with a target thickness is obtained. By optimizing the composition of the brass gold-imitating target material, the application can form a surface color and luster equivalent to pure gold under the sputtering condition of the target material, and provides a suitable hot working process, so that a better surface quality and a higher yield can be obtained.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal materials, and specifically to a method for preparing a brass imitation gold sputtering target. Background Technology

[0002] Copper is the only metal besides gold that doesn't have a silvery-white hue. Its cost is far lower than gold, and different colors can be achieved through alloying. Traditionally, decorative copper alloys, especially brass, have been used to imitate pure gold. The principle involves forming a composite oxide of Cu₂O and ZnO at high temperatures, and then controlling the composition and thickness of the oxide layer to achieve a color similar to pure gold. However, this method typically uses the brass block directly as the decorative material, making it impossible to obtain an extremely thin decorative layer. Furthermore, some research has explored electroplating to deposit gold-like coatings on brass, but this method suffers from the problem of difficult-to-treat electroplating solutions, easily causing pollution. Currently, gold-like sputtering targets are mainly cermets such as carbonitrides (TiCN) and ZrCN, thus lacking the advantages of easy alloy processing and being relatively expensive. Therefore, developing a process for preparing brass gold-like sputtering targets can reduce production equipment requirements and production costs, which is of great significance. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention aims to provide a method for preparing brass imitation gold sputtering targets.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method for preparing a brass imitation gold target material includes the following steps:

[0006] S1. Place pure copper and pure silver into an induction melting furnace and heat to 1100-1200℃. After the pure copper and pure silver are completely melted, add pure aluminum and CuSi intermediate alloy and hold for 1-5 minutes. Then add pure zinc and rare earth materials. After the temperature drops to 1000-1100℃, hold for 1-5 minutes. Then raise the temperature to 1050-1150℃ and then cast to obtain a block ingot.

[0007] S2. Heat the block ingot obtained in step S1 in a heating furnace to 680-780℃ and hold for 20-60 minutes.

[0008] S3. Immediately after exiting the furnace, the block ingot is hot rolled in a single pass on a hot rolling mill, with the rolling deformation not exceeding 30%; after the single pass hot rolling, it is immediately returned to the furnace for heating and held at 680-780℃ for 5-15 minutes.

[0009] S4. Repeat step S3 until the target thickness of the board material is obtained;

[0010] S5. Anneal the board obtained in step S4 at 600-750℃ and hold for 20-80 minutes.

[0011] Furthermore, in step S1, after the pure copper and pure silver are completely melted, carbon black is used as a covering agent to cover the surface of the melt. The carbon black has a mesh size of 20-80. Before casting, the residual carbon black on the surface of the melt is removed.

[0012] Furthermore, in step S1, the mold used for casting is a detachable split mold, and the mold is preheated to 100-400℃ before casting.

[0013] Further, in step S1, the purity of the pure copper is 99.9%; the purity of the pure zinc is 99.9%; the purity of the pure silver is 99.9%; the purity of the pure aluminum is 99.9%; the CuSi master alloy is CuSi 16 or CuSi20; and the rare earth material is a mixed rare earth, pure rare earth metal, or copper-rare earth master alloy.

[0014] Furthermore, in the brass imitation gold target material obtained in step S4, the Zn content is 45-55wt%, the Ag content is ≤1.5wt%, the Al content is ≤3wt%, the Si content is ≤0.5wt%, the total rare earth element content is 0.001-0.05wt%, and the balance is Cu; the zinc equivalent is 48-57, where the zinc equivalent is the equivalent zinc content after taking into account the Al and Si alloying elements, and each zinc equivalent is equivalent to 1%wt of Zn content.

[0015] The present invention also provides a brass imitation gold target material prepared by the above method.

[0016] The beneficial effects of this invention are as follows: Brass gold-imitation sputtering targets have the advantages of being easy to process and low in cost compared to cermets such as TiCN. However, the film color of the brass gold-imitation sputtering target usually differs from the target's own color. This is because the target's own color is usually a low-temperature oxide formed by brass alloys at room temperature and in atmospheric conditions, while the environment in which the target is used during sputtering is significantly different. This invention, by optimizing the composition of the brass gold-imitation sputtering target, can achieve a surface color comparable to pure gold under target sputtering conditions. In addition, since the Zn equivalent of the brass gold-imitation sputtering target of this invention is in the range of 48-57, i.e., it belongs to β+γ two-phase brass, it is difficult to process using conventional plastic deformation processes. Therefore, this invention further provides a hot working process applicable to this brass gold-imitation sputtering target, which can obtain better surface quality and a higher yield. Attached Figure Description

[0017] Figure 1 This is a comparison diagram of the brass imitation gold target material prepared by the method in Example 1 of the present invention and pure gold. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0019] Example 1

[0020] This embodiment provides a method for preparing a brass imitation gold target material, including the following steps:

[0021] S1. Pure copper and pure silver are placed in an induction melting furnace and heated to 1200℃. After the pure copper and pure silver are completely melted, carbon black (20 mesh) is applied to the surface of the melt. Then, pure aluminum and CuSi 16 master alloy are added and held for 1 minute. Subsequently, pure zinc and a mixture of La and Ce rare earth elements are added. After the temperature drops to 1100℃, it is held for 1 minute. Then, the temperature is raised to 1150℃, and the residual carbon black on the surface of the melt is removed. The melt is then cast to obtain a block ingot. The mold used for casting is a modular mold that is easy to disassemble. The mold is preheated to 400℃ before casting.

[0022] The purity of pure copper is 99.9%; the purity of pure zinc is 99.9%; the purity of pure silver is 99.9%; the purity of pure aluminum is 99.9%; the mass content of the La and Ce mixed rare earth is 65% Ce and the remainder is La.

[0023] S2. Heat the ingot to 780℃ and hold for 20 minutes;

[0024] S3. Immediately after exiting the furnace, the alloy is hot-rolled in a single pass on a hot rolling mill with a rolling deformation of 25%. Due to the narrow hot rolling temperature range of this alloy, it is returned to the furnace for reheating after the single-pass hot rolling, and held at 780°C for 5 minutes.

[0025] S4. Repeat step S3 until the final target thickness of the board material is obtained.

[0026] S5. Anneal the sheet material obtained in step S4 at 750℃ for 20 minutes to obtain brass imitation gold target material.

[0027] Figure 1 In the image, the left side represents pure gold, and the right side represents the brass-gold-imitation sputtering target prepared in this embodiment. It can be seen that the sputtered film color of the brass-gold-imitation target prepared in this embodiment meets the requirements. The composition (wt%) of the brass-gold-imitation target in this embodiment is: Zn 50%, Al 1%, Ag 0.5%, Si 0.1%, La and Ce total 0.05%, with the balance being Cu. The zinc equivalent is 48.

[0028] Example 2

[0029] This embodiment provides a method for preparing a brass imitation gold target material, including the following steps:

[0030] S1. Pure copper and pure silver are placed in an induction melting furnace and heated to 1100℃. After the pure copper and pure silver are completely melted, carbon black (80 mesh) is applied to the surface of the melt. Pure aluminum and CuSi2O master alloy are added and held at this temperature for 5 minutes. Then, pure zinc and copper-rare earth master alloy are added. After the temperature drops to 1000℃, it is held at this temperature for 5 minutes. The temperature is then raised to 1050℃. The remaining carbon black on the surface of the melt is removed, and then the melt is cast to obtain a block ingot. The mold used for casting is a modular mold that is easy to disassemble. The mold is preheated to 100℃ before casting.

[0031] In this embodiment, the purity of pure copper is 99.9%; the purity of pure zinc is 99.9%; the purity of pure silver is 99.9%; the purity of pure aluminum is 99.9%; and the copper-rare earth master alloys are CuCe20 master alloy and CuY20 master alloy.

[0032] S2. Heat the ingot to 680℃ and hold for 60 minutes;

[0033] S3. Immediately after exiting the furnace, perform single-pass hot rolling on a hot rolling mill with a rolling deformation of 20%. Therefore, after single-pass hot rolling, return to the furnace for heating and hold at 680℃ for 15 minutes.

[0034] S4. Repeat step S3 until the final target thickness of the board material is obtained.

[0035] S5. Anneal the sheet material obtained in step S4 at 600℃ for 80 minutes to obtain brass imitation gold target material.

[0036] The above method can be used to prepare brass imitation gold sputtering targets with sputtered film colors that meet the requirements. The composition of the brass imitation gold sputtering target is (wt%): Zn content 50%, Al content 1%, Ag content 0.1%, Si content 0.1%, total rare earth element content 0.05%, of which Ce 0.04%, Y 0.01%, and the balance is Cu. The zinc equivalent is 57.

[0037] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this invention.

Claims

1. A method for preparing a brass imitation gold target material, characterized in that, Includes the following steps: S1. Place pure copper and pure silver into an induction melting furnace and heat to 1100-1200℃. After the pure copper and pure silver are completely melted, add pure aluminum and CuSi intermediate alloy and hold for 1-5 minutes. Then add pure zinc and rare earth materials. After the temperature drops to 1000-1100℃, hold for 1-5 minutes. Then raise the temperature to 1050-1150℃ and then cast to obtain a block ingot. S2. Heat the block ingot obtained in step S1 in a heating furnace to 680-780℃ and hold for 20-60 minutes. S3. Immediately after exiting the furnace, the block ingot is hot rolled in a single pass on a hot rolling mill, with the rolling deformation not exceeding 30%; after the single pass hot rolling, it is immediately returned to the furnace for heating and held at 680-780℃ for 5-15 minutes. S4. Repeat step S3 until the target thickness of the board material is obtained; S5. Anneal the sheet material obtained in step S4 at 600-750℃ and hold for 20-80 minutes to obtain brass imitation gold target material. The obtained brass imitation gold sputtering target has a Zn content of 45-55 wt%, an Ag content of ≤1.5 wt%, an Al content of ≤3 wt%, a Si content of ≤0.5 wt%, a total rare earth element content of 0.001-0.05 wt%, and the balance being Cu; the zinc equivalent is 48-57, where the zinc equivalent is the equivalent zinc content after taking into account Al and Si alloying elements, and each zinc equivalent is equivalent to 1% wt of Zn content.

2. The preparation method according to claim 1, characterized in that, In step S1, after the pure copper and pure silver are completely melted, carbon black is used as a covering agent to cover the surface of the melt. The carbon black has a mesh size of 20-80. Before casting, the residual carbon black on the surface of the melt is removed.

3. The preparation method according to claim 1, characterized in that, In step S1, the mold used for casting is a detachable split mold, and the mold is preheated to 100-400℃ before casting.

4. The preparation method according to claim 1, characterized in that, In step S1, the purity of pure copper is 99.9%; the purity of pure zinc is 99.9%; the purity of pure silver is 99.9%; the purity of pure aluminum is 99.9%; the CuSi master alloy is CuSi16 or CuSi20; and the rare earth materials are mixed rare earth, pure rare earth metal, or copper-rare earth master alloy.

5. A brass imitation gold sputtering target material prepared by any one of the preparation methods described in claims 1-4.

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