Preparation method of gold-tin alloy evaporation material

Abstract

The present application relates to the field of precious metal alloy material, and particularly relates to a preparation method of gold-tin alloy evaporation material. The gold-tin alloy evaporation material is composed of the following elements with the weight percentage: tin 19-21%, impurity element content ≤20ppm, and the balance of gold. The preparation method comprises the following steps: weighing gold and tin raw materials according to the set composition → putting the weighed gold and tin into the crucible of a continuous casting machine → vacuumizing and filling Ar gas for protection → heating and adjusting the temperature to 400-500 DEG C → adjusting the temperature to 350-400 DEG C after the gold is completely melted, and keeping the temperature for 20-30 minutes → taking the alloy melt out of the heating area through a crystallizer, and cooling and solidifying the alloy melt by using cooling water to obtain gold-tin alloy wire → heat treating the gold-tin alloy wire → machining the heat treated material to obtain the gold-tin alloy evaporation material. The present application has the advantages of simple process and high efficiency, and the prepared gold-tin alloy evaporation material has excellent cold working performance, and has great application prospect in the electronic and communication industries.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of precious metal alloy materials, in particular to a preparation method of gold-tin alloy evaporation material. BACKGROUND

[0002] Precious metals have excellent physical and chemical properties, as well as high electrical conductivity, thermal conductivity, stability and other properties, and are widely used in many fields of modern industry. Precious metals include gold, silver, platinum, palladium, ruthenium, rhodium, iridium, and osmium. Among them, platinum, palladium, ruthenium, rhodium, iridium, and osmium represented by platinum are also known as platinum group metals. Due to the high price of precious metals, they have mainly played the role of currency and finance in history. With the continuous development of China's industry and modern science and technology, the role of precious metals as high-tech metals is becoming more and more obvious, and the demand for precious metal materials in modern industry is increasing. At present, developed countries such as Europe and the United States have carried out more research on gold-based alloys and have formed a series of products. China started late in this regard, and there are fewer products. The scale and technology of related production enterprises still have some gap with developed countries. Taking gold-tin alloy as an example, this alloy has good high-temperature performance, excellent corrosion resistance, good electrical and thermal conductivity, and high strength, and is one of the ideal evaporation materials in the field of electronics and communication. However, previous research: the existence of coarse primary intermetallic compounds (such as Au5Sn phase) in the gold-tin alloy organization makes the alloy brittle, and it is difficult to process and form by conventional means, which restricts its development and application. Therefore, it is of great scientific and practical significance to develop gold-tin alloy evaporation material. SUMMARY

[0003] The purpose of the present application is to provide a preparation method of gold-tin alloy evaporation material to meet the demand for high-end evaporation material in industrial production.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0005] A preparation method of gold-tin alloy evaporation material, comprising the following steps:

[0006] 1) Weigh the gold and tin raw materials according to the following weight percentage: gold 79-81%, tin 19-21%;

[0007] 2) Put the weighed gold and tin raw materials into the crucible of the continuous casting machine;

[0008] 3) Use a vacuum unit to vacuum the melting chamber of the continuous casting machine to an air pressure below 1 Pa, and fill Ar gas;

[0009] 4) Heat the crucible containing gold and tin raw materials and adjust the temperature to 400-500℃;

[0010] 5) After the gold is completely melted, the temperature is adjusted to 350-400 DEG C, and the temperature is maintained for 20-30 minutes;

[0011] 6) The alloy melt is pulled out of the heating area through the crystallizer, and is cooled and solidified by using cooling water to obtain a gold-tin alloy wire with a diameter of 3-10 mm;

[0012] 7) The obtained gold-tin alloy wire is placed into a heat treatment furnace, and is heated to 200-260 DEG C, and is maintained for 1-10 hours;

[0013] 8) The material after heat treatment is machined to obtain a gold-tin alloy evaporation material.

[0014] The preparation method of the gold-tin alloy evaporation material, in step 8), the gold-tin alloy evaporation material is composed of the following elements with a weight percentage of: tin 19-21%, impurity element content ≤20ppm, and the balance is gold.

[0015] The principle of the application is as follows:

[0016] The application utilizes the method of alloying to realize the preparation of gold-tin alloy melt and alloy wire at a lower temperature; through heat treatment of the alloy wire, the coarse primary intermetallic compound in the alloy is eliminated, thereby improving the machining performance of the alloy.

[0017] The advantages and beneficial effects of the application are as follows:

[0018] 1) The gold-tin alloy evaporation material preparation method has a lower smelting temperature, and the alloying is carried out under inert gas, which can effectively avoid the problems of melt oxidation and low purity caused by high-temperature alloying.

[0019] 2) The gold-tin alloy evaporation material preparation method can significantly improve the machining performance of the alloy and realize the machining of the gold-tin alloy material at room temperature.

[0020] 3) The gold-tin alloy evaporation material preparation method has the advantages of simple process and high efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a real picture of the gold-tin alloy evaporation material prepared according to the method described in embodiment 1.

[0022] Figure 2 It is a microstructure of the gold-tin alloy evaporation material prepared according to the method described in embodiment 1.

[0023] Figure 3 It is a room temperature compression curve of the gold-tin alloy evaporation material prepared according to the method described in embodiment 1. In the figure, the horizontal coordinate Strain is strain (%), and the vertical coordinate Stress is stress (MPa).

[0024] Figure 4 Microstructure of the gold-tin alloy evaporation material prepared according to the method of Comparative Example 1.

[0025] Figure 5 Room temperature compression curve of the gold-tin alloy evaporation material prepared according to the method of Comparative Example 1. In the figure, the horizontal coordinate Strain is strain (%), and the vertical coordinate Stress is stress (MPa). DETAILED DESCRIPTION

[0026] In the specific implementation, the gold-tin alloy evaporation material is composed of the following elements in percentage by weight: tin 19-21%, impurity element content ≤20 ppm, and the balance being gold. The preparation method is as follows: weighing gold and tin raw materials according to the set composition → placing the weighed gold and tin into the crucible of a continuous casting machine → vacuumizing and filling Ar gas for protection → heating and adjusting the temperature to 400-500°C → adjusting the temperature to 350-400°C after the gold is completely melted, and keeping the temperature for 20-30 minutes → pulling the alloy melt out of the heating area through a crystallizer, and cooling and solidifying the alloy melt by using cooling water to obtain a gold-tin alloy wire → heat treating the gold-tin alloy wire → machining the heat treated material to obtain the gold-tin alloy evaporation material.

[0027] The application will be described in detail below in combination with the drawings and examples, but the protection scope and application scope of the application are not limited to the following examples.

[0028] Example 1

[0029] In this embodiment, a preparation method of a gold-tin alloy evaporation material is as follows:

[0030] 1) weighing gold and tin raw materials according to the following percentage by weight: gold 80%, and tin 20%;

[0031] 2) placing the weighed gold and tin raw materials into the crucible of a continuous casting machine;

[0032] 3) vacuumizing the melting chamber of the continuous casting machine to an air pressure of 0.5 Pa by using a vacuum unit, and filling Ar gas;

[0033] 4) heating and adjusting the temperature of the crucible containing the gold and tin raw materials to 500°C;

[0034] 5) adjusting the temperature to 400°C after the gold is completely melted, and keeping the temperature for 20 minutes;

[0035] 6) pulling the alloy melt out of the heating area through a crystallizer, and cooling and solidifying the alloy melt by using cooling water to obtain a gold-tin alloy wire with a diameter of 3 mm;

[0036] 7) Put the obtained gold-tin alloy wire into a heat treatment furnace, heat to 240℃, and keep for 2 hours, and cool to room temperature with the furnace;

[0037] 8) Machine the material after heat treatment to obtain gold-tin alloy evaporation material.

[0038] Figure 1 The gold-tin alloy evaporation material prepared by the present embodiment is given, which has a composition of Au-20wt%Sn and a diameter of 3mm. Figure 2 The microstructure of the gold-tin alloy evaporation material prepared by the present embodiment is given, which can be seen that the alloy is mainly composed of eutectic structure of (Au5Sn+AuSn phase). Figure 3 The room temperature compression performance of the gold-tin alloy evaporation material prepared by the present embodiment is given, which can be seen that the material has excellent processing deformation ability at room temperature.

[0039] Example 2

[0040] In the present embodiment, a preparation method of gold-tin alloy evaporation material is provided, which comprises the following steps:

[0041] 1) Weigh gold and tin raw materials according to the following weight percentage: gold 79%, tin 21%;

[0042] 2) Put the weighed gold and tin raw materials into the crucible of the continuous casting machine;

[0043] 3) Use the vacuum unit to vacuum the melting chamber of the continuous casting machine to an air pressure of 0.3Pa, and fill with Ar gas;

[0044] 4) Heat the crucible containing gold and tin raw materials and adjust the temperature to 400℃;

[0045] 5) After the gold is completely melted, adjust the temperature to 350℃ and keep for 30 minutes;

[0046] 6) Draw the alloy melt out of the heating area through the crystallizer, and use cooling water to cool and solidify to obtain a gold-tin alloy wire with a diameter of 10mm;

[0047] 7) Put the obtained gold-tin alloy wire into a heat treatment furnace, heat to 260℃, and keep for 1 hour, and cool to room temperature with the furnace;

[0048] 8) Machine the material after heat treatment to obtain gold-tin alloy evaporation material.

[0049] The gold-tin alloy evaporation material prepared by the present embodiment has a composition of Au-21wt%Sn and a diameter of 10mm.

[0050] Example 3

[0051] In this embodiment, a preparation method of a gold-tin alloy evaporation material is as follows:

[0052] 1) Gold and tin raw materials are weighed according to the following weight percentage: gold 81%, tin 19%;

[0053] 2) The weighed gold and tin raw materials are placed into a crucible of a continuous casting machine;

[0054] 3) The vacuum unit is used to vacuum the smelting chamber of the continuous casting machine to an air pressure of 0.7 Pa, and Ar gas is filled;

[0055] 4) The crucible containing the gold and tin raw materials is heated and the temperature is adjusted to 450°C;

[0056] 5) After the gold is completely melted, the temperature is adjusted to 370°C, and the temperature is maintained for 25 minutes;

[0057] 6) The alloy melt is pulled out of the heating area through a crystallizer, and cooled and solidified by using cooling water to obtain a gold-tin alloy wire with a diameter of 5 mm;

[0058] 7) The obtained gold-tin alloy wire is placed into a heat treatment furnace, heated to 200°C, and maintained for 10 hours, and cooled to room temperature in the furnace;

[0059] 8) The material after heat treatment is machined to obtain a gold-tin alloy evaporation material.

[0060] The gold-tin alloy evaporation material prepared in this embodiment has a composition of Au-19wt%Sn and a diameter of 5 mm.

[0061] Comparative Example 1

[0062] In this comparative example, a preparation method of a gold-tin alloy evaporation material is as follows:

[0063] 1) Gold and tin raw materials are weighed according to the following weight percentage: gold 80%, tin 20%;

[0064] 2) The weighed gold and tin raw materials are placed into a crucible of a continuous casting machine;

[0065] 3) The vacuum unit is used to vacuum the smelting chamber of the continuous casting machine to an air pressure of 0.5 Pa, and Ar gas is filled;

[0066] 4) The crucible containing the gold and tin raw materials is heated and the temperature is adjusted to 500°C;

[0067] 5) After the gold is completely melted, the temperature is adjusted to 400°C, and the temperature is maintained for 20 minutes;

[0068] 6) The alloy melt is pulled out of the heating area through a crystallizer, and cooled and solidified by using cooling water to obtain a gold-tin alloy wire with a diameter of 3 mm;

[0069] 7) The obtained gold-tin alloy wire is machined to obtain a gold-tin alloy evaporation material.

[0070] The gold-tin alloy evaporation material prepared in the present example has a composition of Au-20wt%Sn and a diameter of 3mm. Figure 4 The microstructure of the gold-tin alloy evaporation material prepared in the present example is shown, which is mainly composed of coarse primary intermetallic compounds (such as Au5Sn phase) and eutectic structure (Au5Sn+AuSn phase). Figure 5 The room temperature compression performance of the gold-tin alloy evaporation material prepared in the present example is shown, which has poor processing deformation ability at room temperature.

[0071] The implementation results show that the present process is simple and efficient, and the prepared gold-tin alloy evaporation material has excellent cold working performance. The gold-tin alloy evaporation material provided by the present technology has great application prospect in the electronic and communication industries.

Claims

1. A method for producing an Au-Sn alloy evaporation material, characterized by, The method comprises the following steps: 1) weighing gold and tin raw materials according to the following weight percentage: gold 79-81%, tin 19-21%; 2) putting the weighed gold and tin raw materials into a crucible of a continuous casting machine; 3) using a vacuum unit to vacuum the smelting chamber of the continuous casting machine to an air pressure below 1 Pa and filling Ar gas; 4) heating the crucible containing the gold and tin raw materials and adjusting the temperature to 400-500°C; 5) after the gold is completely melted, adjusting the temperature to 350-400°C and keeping the temperature for 20-30 minutes; 6) taking the alloy melt out of the heating area through a crystallizer and cooling it by using cooling water to obtain gold-tin alloy wire with a diameter of 3-10 mm; 7) putting the obtained gold-tin alloy wire into a heat treatment furnace, heating to 200-260°C and keeping the temperature for 1-10 hours, eliminating coarse primary intermetallic compounds in the alloy by heat treatment of the alloy wire, thereby improving the machining performance of the alloy; 8) machining the heat-treated material to obtain gold-tin alloy evaporation material.

2. The method of producing a gold-tin alloy evaporation material according to claim 1, characterized by, In step 8), the gold-tin alloy evaporation material is composed of the following weight percentage of elements: tin 19-21%, impurity element content ≤20 ppm, and the balance being gold.

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