Copper alloy heat dissipation part and casting method thereof

Abstract

The invention discloses a copper alloy heat dissipation part and a casting method thereof, relates to the technical field of composite material casting, and aims to solve the problem that a copper alloy heat dissipation part obtained through machining in the prior art is difficult to meet application requirements. The method comprises the following steps: loading metal chromium and an electrolytic copper plate into a crucible, loading rare earth La and a phosphorus-copper deoxidizing agent into a secondary loading hopper, and starting smelting; after the metal in the crucible is completely melted, high-purity argon is filled into the furnace body according to the filling speed of 0.8 L / min-1. 2L / min, and refining is started; after refining is completed, a phosphorus-copper deoxidizing agent and rare earth La are added through a secondary feeding hopper, and deoxidation treatment and grain refining treatment are carried out; after deoxidation and grain refining treatment, molten metal is fully fused, and then casting treatment is started; and after casting treatment is completed, cooling is conducted, and after solution treatment, aging treatment and shot blasting treatment are sequentially conducted, machining is adopted to obtain the copper alloy heat dissipation part.

Description

Technical Field

[0001] The present application relates to the technical field of metal material casting, and in particular to a copper alloy heat dissipation component and a casting method thereof. Background Art

[0002] Copper alloy heat dissipation parts play an important role in electronic equipment, mechanical equipment, aerospace and other fields. These parts use the excellent thermal conductivity, electrical conductivity, corrosion resistance and toughness of copper alloys to effectively transfer heat from the heat source to the heat dissipation environment to ensure the stable operation of the equipment.

[0003] There are many manufacturing processes for copper alloy heat sink parts, including casting, forging, stamping, machining, etc. With the advancement of science and technology, additive manufacturing technology (such as 3D printing technology) has also been gradually applied to the production of copper alloy heat sink parts, providing more possibilities for the manufacture of complex structures.

[0004] However, the copper alloy heat dissipation parts obtained by existing processing technology are difficult to meet application requirements. Summary of the invention

[0005] The main purpose of the present application is to provide a copper alloy heat dissipation component and a casting method thereof, aiming to solve the problem that the copper alloy heat dissipation components obtained by processing with the prior art are difficult to meet application requirements.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:

[0007] In a first aspect, an embodiment of the present application provides a method for casting a copper alloy heat dissipation part, comprising the following steps:

[0008] According to the mass ratio of metal chromium of 0.1%-0.25%, the mass ratio of rare earth La of 0.04%-0.06%, the mass ratio of phosphor copper deoxidizer of 0.03% and the balance of electrolytic copper plate, metal chromium and electrolytic copper plate are loaded into the crucible, rare earth La and phosphor copper deoxidizer are loaded into the secondary charging hopper, and smelting is started;

[0009] When all the metal in the crucible is melted, high-purity argon is charged into the furnace at a rate of 0.8L / min-1.2L / min to start refining; after the refining is completed, phosphor copper deoxidizer and rare earth La are added through the secondary feeding funnel to perform deoxidation and grain refinement; after deoxidation and grain refinement, the metal liquid is fully fused and then casting is started; after the casting is completed, it is cooled to obtain an alloy blank;

[0010] The alloy blank is subjected to solution treatment, aging treatment and shot peening treatment in sequence, and then mechanical processing is adopted to obtain a copper alloy heat dissipation part.

[0011] As some optional embodiments of the present application, the step of loading the metal chromium and the electrolytic copper plate into the crucible, loading the rare earth La and the phosphorus copper deoxidizer into the secondary feeding hopper, and starting the smelting comprises:

[0012] Put metal chromium and electrolytic copper plate into the crucible, rare earth La and phosphor copper deoxidizer into the secondary feeding hopper, close the vacuum induction furnace, close the vent valve; start the mechanical pump to evacuate the vacuum, and when the vacuum pressure in the furnace is р≤0.08MPa, start the Roots pump to start smelting.

[0013] As some optional embodiments of the present application, after all the metal in the crucible is melted, high-purity argon is charged into the furnace at a rate of 0.8 L / min-1.2 L / min to start the refining step, including:

[0014] When the vacuum pressure in the furnace is р≤10Pa, the power is increased to 10±2KW for heating treatment for 5min, the power is increased to 20±2KW for heating treatment for 10min, the power is increased to 40±2KW for heating treatment for 10min, and the power is increased to 65KW for heating treatment until all the metal in the crucible is melted, then the power is reduced to 20KW, the argon valve is opened, and high-purity argon is filled into the furnace body at a rate of 0.8L / min-1.2L / min. When the pressure in the furnace rises to -0.08MPa, the argon filling valve is closed, and the power is increased to 65KW for refining treatment for 4min-5min.

[0015] As some optional implementation modes of the present application, the total time of the deoxidation treatment and the grain refinement treatment is 20s-30s; the total casting time of the casting treatment is 20s-25s; and the cooling time is 20min.

[0016] As some optional embodiments of the present application, the solution treatment includes: loading the alloy blank into a quenching furnace, heating to 985°C±10°C, keeping warm for 1h-1.5h, cooling for 5min, and draining for 2min.

[0017] As some optional embodiments of the present application, the aging treatment includes: loading the alloy blank after the solution treatment into an aging furnace, keeping it at 485±10°C for 4 hours, and air-cooling the furnace for aging treatment.

[0018] In a second aspect, an embodiment of the present application provides a copper alloy heat dissipation component obtained by casting as described above, wherein the electrical conductivity of the copper alloy heat dissipation component is >95% / IACS.

[0019] In a third aspect, an embodiment of the present application provides a copper alloy heat dissipation component obtained by casting as described above, wherein the hardness of the copper alloy heat dissipation component is HV>115.

[0020] In a fourth aspect, an embodiment of the present application provides a copper alloy heat dissipation component obtained by casting as described above, wherein the tensile strength of the copper alloy heat dissipation component is >400 MPa.

[0021] In a fifth aspect, an embodiment of the present application provides a copper alloy heat dissipation part obtained by casting as described above, wherein the softening temperature of the copper alloy heat dissipation part is >400°C.

[0022] Compared with the prior art, the technical solution described in the present application optimizes the material components and the subsequent processing steps, so that the final product has significant advantages in performance; that is, the present application adds metal chromium, rare earth element La (lanthanum) and phosphor copper deoxidizer to the copper alloy, and this specific alloy component helps to improve the mechanical strength and heat resistance of the material. Metal chromium can improve the hardness and corrosion resistance of the alloy, and the rare earth element La as a microalloying element can refine the grains and improve the strength and toughness of the alloy. The phosphor copper deoxidizer is used to improve the purity of the melt and reduce the formation of oxides, thereby improving the conductivity and heat resistance of the heat dissipation components. And by filling high-purity argon gas for refining during the smelting process, and subsequent deoxidation treatment, the microstructure and chemical purity of the alloy are further optimized. This treatment method can effectively remove impurities and non-metallic impurities and improve the overall performance of the material. And the grain refinement described in the present application is achieved by adding rare earth La, and the refined grain structure helps to enhance the mechanical properties of the alloy, especially the stability under high temperature environment. Refining the grains can also improve the material's fatigue resistance, which is especially important for heat dissipation components because they often work in a thermal cycling environment. This application also adds post-processing steps such as solution treatment, aging treatment, and shot peening, which further improve the material's mechanical properties and surface characteristics. Solution treatment and aging treatment optimize the alloy's strength and toughness, while shot peening improves the surface's wear resistance and corrosion resistance.

[0023] It can be seen that the copper alloy heat dissipation parts obtained by the present application through the above-mentioned material optimization and process optimization have excellent properties of more than 95% conductivity (IACS standard), hardness higher than 115HV, tensile strength higher than 400MPa and softening temperature higher than 400°C. These performance indicators are significantly better than many traditional copper alloy materials, making this copper alloy heat dissipation part particularly suitable for high-performance electronic equipment and high-temperature working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic flow chart of a method for casting a copper alloy heat dissipation part according to an embodiment of the present application;

[0025] Figure 2 A schematic diagram of an alloy blank involved in an embodiment of the present application;

[0026] Figure 3A schematic diagram of a copper alloy heat dissipation component involved in an embodiment of the present application;

[0027] Figure 4 This is a 100X uncorroded material metallographic structure diagram involved in the embodiment of the present application;

[0028] Figure 5 This is a 500X uncorroded material metallographic structure diagram involved in the embodiment of the present application;

[0029] Figure 6 This is a schematic diagram of the tooling structure involved in the embodiment of the present application;

[0030] In the figure, 601 represents the tailstock locking component, 602 represents the copper alloy heat dissipation part, and 603 represents the positioning locking vise component. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] In view of the technical problems existing in the prior art, the embodiments of the present application provide a casting method for a copper alloy heat dissipation part, such as Figure 1 As shown, the following steps are included:

[0033] Step S10, according to the mass ratio of metal chromium of 0.1%-0.25%, the mass ratio of rare earth La of 0.04%-0.06%, the mass ratio of phosphor copper deoxidizer of 0.03% and the balance of electrolytic copper plate, metal chromium and electrolytic copper plate are loaded into a crucible, rare earth La and phosphor copper deoxidizer are loaded into a secondary feeding hopper, and smelting is started;

[0034] Step S20, when all the metal in the crucible is melted, high-purity argon is charged into the furnace at a rate of 0.8L / min-1.2L / min to start refining; after the refining is completed, phosphor copper deoxidizer and rare earth La are added through the secondary feeding funnel to perform deoxidation treatment and grain refinement treatment; after the deoxidation and grain refinement treatment, the metal liquid is fully fused and then the casting treatment is started; after the casting treatment is completed, it is cooled to obtain Figure 2 Alloy blanks shown;

[0035] S30, after subjecting the alloy blank to solution treatment, aging treatment and shot peening treatment in sequence, mechanical processing is performed to obtain Figure 3 Copper alloy heat sink parts shown.

[0036] The metallographic surface of the copper alloy heat sink parts is corroded by ferric chloride Cl, and the structure and morphology of the material can be seen more clearly. The metallographic structure of the uncorroded material at 100X is as follows: Figure 4 As shown, the metallographic structure of the uncorroded material at 500X is as follows Figure 5 As shown. It can be seen that the material described in this application has high purity and low content of tissue impurities, which are the basis for the material to have high conductivity (conductivity > 95% / IACS).

[0037] Compared with the prior art, the technical solution described in the present application optimizes the material components and the subsequent processing steps, so that the final product has significant advantages in performance; that is, the present application adds metal chromium, rare earth element La (lanthanum) and phosphor copper deoxidizer to the copper alloy, and this specific alloy component helps to improve the mechanical strength and heat resistance of the material. Metal chromium can improve the hardness and corrosion resistance of the alloy, and the rare earth element La as a microalloying element can refine the grains and improve the strength and toughness of the alloy. The phosphor copper deoxidizer is used to improve the purity of the melt and reduce the formation of oxides, thereby improving the conductivity and heat resistance of the heat dissipation components. And by filling high-purity argon gas for refining during the smelting process, and subsequent deoxidation treatment, the microstructure and chemical purity of the alloy are further optimized. This treatment method can effectively remove impurities and non-metallic impurities and improve the overall performance of the material. And the grain refinement described in the present application is achieved by adding rare earth La, and the refined grain structure helps to enhance the mechanical properties of the alloy, especially the stability under high temperature environment. Refining the grains can also improve the material's fatigue resistance, which is especially important for heat dissipation components because they often work in a thermal cycling environment. This application also adds post-processing steps such as solution treatment, aging treatment, and shot peening, which further improve the material's mechanical properties and surface characteristics. Solution treatment and aging treatment optimize the alloy's strength and toughness, while shot peening improves the surface's wear resistance and corrosion resistance.

[0038] It can be seen that the copper alloy heat dissipation parts obtained by the above-mentioned material optimization and process optimization have excellent properties of over 95% conductivity (IACS standard), hardness higher than 115HV, tensile strength higher than 400MPa and softening temperature higher than 400°C. These performance indicators are significantly better than many traditional copper alloy materials, making this heat dissipation part particularly suitable for high-performance electronic equipment and high-temperature working environments.

[0039] Specifically, the step of loading metal chromium and electrolytic copper plates into a crucible, loading rare earth La and phosphor copper deoxidizer into a secondary feeding hopper, and starting smelting includes: loading metal chromium and electrolytic copper plates into a crucible, loading rare earth La and phosphor copper deoxidizer into a secondary feeding hopper, closing the vacuum induction furnace, and closing the venting valve; starting a mechanical pump to evacuate, and when the vacuum pressure in the furnace is р≤0.08MPa, starting a Roots pump to start smelting.

[0040] Specifically, after all the metal in the crucible is melted, high-purity argon is charged into the furnace body at a rate of 0.8L / min-1.2L / min to start the refining step, including: when the vacuum pressure in the furnace is р≤10Pa, the power is increased to 10±2KW for heating treatment for 5min, the power is increased to 20±2KW for heating treatment for 10min, the power is increased to 40±2KW for heating treatment for 10min, the power is increased to 65KW for heating treatment until all the metal in the crucible is melted, the power is reduced to 20KW, the argon valve is opened, and high-purity argon is charged into the furnace body at a rate of 0.8L / min-1.2L / min. When the pressure in the furnace rises to -0.08MPa, the argon charging valve is closed, and the power is increased to 65KW for refining treatment for 4min-5min.

[0041] Specifically, the total time of the deoxidation treatment and the grain refinement treatment is 20s-30s; the total casting time of the casting treatment is 20s-25s; and the cooling time is 20min.

[0042] Specifically, the solution treatment includes: placing the alloy blank into a quenching furnace, heating to 985°C±10°C, keeping the temperature for 1h-1.5h, cooling for 5min, and draining for 2min.

[0043] Specifically, the aging treatment includes: placing the alloy blank after the solid solution treatment into an aging furnace, keeping it at 485±10° C. for 4 hours, and air cooling it with the furnace to perform the aging treatment.

[0044] The copper alloy heat dissipation parts cast by the above method have a conductivity of >95% / IACS, a hardness HV of >115, a tensile strength of >400MPa, and a softening temperature of >400°C.

[0045] The above technical solution of the present application is described in detail below in conjunction with specific embodiments. It should be noted that the material compositions of the following embodiments 1 to 6 are different, but the casting methods are the same, that is, they all include the following steps:

[0046] After obtaining the material composition in proportion, put the metal chromium and electrolytic copper plate into the crucible, the rare earth La and phosphor copper deoxidizer into the secondary feeding hopper, close the vacuum induction furnace, close the vent valve, and clean the observation window; turn on the mechanical pump to evacuate, and when the vacuum pressure in the furnace is р≤0.08MPa, turn on the Roots pump; during smelting, when the vacuum pressure is drawn to (р≤10Pa), the power is increased to 10±2KW for heating treatment for 5min, the power is increased to 20±2KW for heating treatment for 10min, the power is increased to 40±2KW for heating treatment for 10min, and the power is increased to 65KW for heating treatment until all the metal in the crucible is melted, then the power is reduced to 20KW, the argon valve is opened, and the injection rate is 0.8L / min-1. High-purity argon is filled into the furnace body at 2L / min. When the pressure in the furnace rises to about -0.08MPa, the argon filling valve is closed, and the power is increased to 65KW for refining treatment for 4min-5min. After the refining is completed, deoxidizer phosphorus copper and grain-refining rare earth La are added through the secondary feeding funnel for deoxidation and grain refinement, and the reaction time is 20S-30S. After deoxidation and grain refinement, the crucible is turned upside down twice to make the metal liquid fully fused and uniform, and then casting is started. A special water-cooled copper mold is used for casting. The casting speed is first slow and then accelerated, and finally slowed down to feed the shrinkage riser; the total casting time is 20S-25S. After the casting is completed, the heating is turned off, and the ingot is taken out of the furnace after cooling for 20 minutes, and the quality of the copper alloy ingot is checked to obtain the casting blank.

[0047] Place the casting blank flatly and evenly into the material frame and load it into the quenching furnace. Start timing when the furnace temperature rises to 985℃, keep warm for 1h-1.5h, cool for 5min, and drain for 2min. Perform solid solution treatment. Keep warm at 485±10℃ for 4h, air cool with the furnace, and perform aging treatment. The blank is evenly hung on the hanger and the surface is shot peened to remove the surface oxide scale, extrusion and heat treatment hardening layer of the product, reduce the surface hardness of the blank, and improve the cutting performance and tool life.

[0048] According to the product drawings and processing requirements, special fixtures are designed and manufactured for clamping. All processes such as drilling, milling, boring, tapping, and slot milling can be completed in one clamping. The number of clamping times can be reduced, and 5 clamping times can be combined into 1 clamping time to avoid the effects of unstable and inconsistent product dimensions and deformation of assembly holes caused by repeated clamping. The fixture consists of two parts: the positioning and locking vise component and the tailstock locking component. Figure 6 In the figure shown, 601 represents the tailstock locking component, 602 represents the copper alloy heat dissipation part, and 603 represents the positioning locking vise component.

[0049] The material composition ratios of Examples 1 to 6 are shown in Table 1:

[0050] Table 1:

[0051]

[0052] Comparative Example 1

[0053] The blank is produced by a casting process. The material ratio of this comparative example is: Cu mass ratio content is 99.9%, and the rest is impurities; that is, this comparative example is to compare the performance difference between the two materials after vacuum casting. This comparative example is set to electrolytic copper plate casting, without adding Cr element, and is made of pure copper.

[0054] Comparative Example 2

[0055] The material ratio of this comparative example is: Cr content is 0.5%-1.1%, and the rest is Cu, and no rare earth lanthanum and copper-magnesium deoxidizer are contained.

[0056] Experimental example

[0057] The alloy heat dissipation parts obtained in Examples 1-6 were named as Samples 1 to 6, the alloy parts of Comparative Example 1 were named as Comparative Sample 1, and the alloy parts of Comparative Example 2 were named as Comparative Sample 2. The samples 1 to 6, Comparative Sample 1 and Comparative Sample 2 were respectively subjected to conductivity tests, tensile strength tests, elongation tests, hardness tests and softening temperature tests.

[0058] Among them, the conductivity test refers to the test with a conductivity meter after the surface of the sample block is processed after the solid solution and aging treatments are completed. The testing environment is 20℃-25℃. The calibration block must be calibrated first during the test. After passing the test, the surface of the sample block is milled to ensure that the surface is smooth and clean (roughness within Ra1.6); the conditions for the solid solution treatment are 995℃×1h, water cooling; the conditions for the aging treatment are 475℃×1h, air cooling after leaving the furnace.

[0059] The tensile strength test and elongation test refer to processing the samples into tensile bars after sampling, and then testing the tensile strength and elongation of the tensile bars on a tensile testing machine.

[0060] Among them, the hardness test standard is based on GB-T 231-1-2018, Brinell hardness test standard.

[0061] The softening temperature test standard is GB / T 33370-2016 Copper and Copper Alloy Softening Temperature Determination Method. The softening temperature refers to the insulation temperature corresponding to the hardness of copper and copper alloy materials when they are naturally cooled to room temperature after being kept warm for 1 hour. The softening temperature measurement method is to first detect the original hardness of the sample, then keep the sample at different temperatures for 1 hour and then cool it naturally. After the insulation, the hardness of the sample is reduced to 80% of the original hardness. This temperature is the softening temperature of the material sample.

[0062] The test results are shown in Table 2:

[0063] Table 2:

[0064]

[0065] It can be seen that the samples 1 to 6 described in this application are significantly better than the comparative samples 1 and 2 in terms of conductivity, tensile strength, elongation, hardness and softening temperature. This is mainly because this application achieves this through the optimization of alloy composition, improvement of smelting and refining process and subsequent heat treatment process. Specifically, it includes the following aspects:

[0066] Optimization design of alloy composition: In traditional copper alloy casting methods, simple alloy composition design is often adopted, which mainly relies on the basic properties of copper (such as electrical conductivity and thermal conductivity). However, in the technical solution of this application, the following points are particularly emphasized: 1) The mass ratio of metal chromium is 0.1%-0.25%. This design helps to improve the mechanical strength and corrosion resistance of copper alloys. Chromium can form a solid solution in copper alloys, thereby improving the high temperature resistance and hardness of the alloy. This is particularly important for heat dissipation parts, because the strength and stability of the alloy are crucial when used in high temperature environments. 2) The mass ratio of rare earth La is 0.04%-0.06%. Rare earth elements can play a role in refining grains in the alloy, enhance the uniformity of the alloy's microstructure, and improve mechanical properties such as tensile strength and hardness. In addition, rare earth elements can also improve the oxidation resistance and thermal stability of the alloy, and have a positive effect on the use of copper alloys under high temperature conditions. 3) The mass ratio of phosphorus copper deoxidizer is 0.03%. This addition helps to remove oxygen during the smelting process, improve the purity of the copper alloy, reduce the formation of oxides, and thus improve the electrical conductivity and mechanical properties of the alloy. The optimized design of this alloy composition enables the cast copper alloy heat dissipation parts to have higher hardness, stronger tensile strength, better conductivity and higher softening temperature, meeting the requirements of high-performance heat dissipation parts.

[0067] Improvement of smelting and refining process: In the traditional copper alloy smelting process, refining is often carried out by air or lower purity gas, while the technical solution of the present application proposes that after the metal is melted, high-purity argon gas is charged into the furnace body at a rate of 0.8L / min-1.2L / min for refining. This step helps to remove impurities in the molten metal, reduce the oxygen content, and avoid the influence of oxides on the properties of the alloy, thereby obtaining a purer copper alloy. And after the refining is completed, phosphor copper deoxidizer and rare earth La are used for deoxidation and grain refinement. This process significantly improves the microstructure of the copper alloy, makes the grains of the alloy more refined, and thereby improves the comprehensive mechanical properties of the alloy, such as tensile strength, hardness and ductility. Through this refining treatment, the purity and performance of the copper alloy have been significantly improved.

[0068] Improvement of heat treatment process: In the traditional copper alloy casting process, heat treatment is often limited to simple solution treatment or aging treatment, while the technical solution of this application optimizes the heat treatment process and adopts a triple heat treatment process, namely: through solution treatment, the various components in the alloy are evenly distributed to improve the mechanical properties of the alloy; aging treatment can further improve the hardness and strength of the alloy and increase its durability; shot peening is a surface strengthening technology that uses a high-pressure airflow to spray small particles of material (such as steel balls, etc.) to impact the surface of copper alloy parts, thereby improving the mechanical properties and fatigue resistance of the surface. This technology is particularly important in copper alloy heat dissipation parts because the surface strength directly affects its service life and heat dissipation effect. Through the combination of these triple heat treatment processes, the hardness, strength, corrosion resistance and fatigue performance of copper alloy heat dissipation parts can be significantly improved, enabling them to maintain stable performance in complex and harsh use environments.

[0069] It can be seen that, through the optimization of the above alloy composition design, smelting and refining process and heat treatment technology, the copper alloy heat dissipation parts cast by the technical solution of the present application have surpassed the standards of the prior art in many performance indicators:

[0070] Electrical conductivity>95% / IACS: High electrical conductivity means that the copper alloy has excellent electrical conductivity, which is especially important for heat dissipation parts and can improve the heat dissipation effect.

[0071] Hardness HV>115: This hardness level ensures the wear resistance and deformation resistance of the copper alloy, and is suitable for high-intensity and long-term use occasions.

[0072] Tensile strength>400MPa: Improves the mechanical strength of copper alloy, ensuring that parts are not easily broken or deformed under stress, enhancing their reliability and safety.

[0073] Softening temperature>400℃: The higher softening temperature improves the stability of copper alloy in high temperature environment, prevents it from softening or deforming at high temperature, and ensures its long-term stable operation during the heat dissipation process.

[0074] In summary, it can be seen that traditional copper alloy casting usually focuses on the physical properties of pure copper, while the present application significantly improves the mechanical properties and thermal stability of the alloy by precisely controlling the alloy composition and refining process. The application of rare earth elements and chromium elements introduced into the alloy, as well as the use of high-purity argon gas for deoxidation treatment during the refining process, are the innovations of the present application. These measures effectively improve the performance of copper alloys, especially in key performance indicators such as hardness, tensile strength and softening temperature, and can meet the requirements of high-performance heat dissipation parts. The present application adopts a multi-step heat treatment process (solution treatment, aging treatment and shot peening) to further improve the comprehensive performance of copper alloy heat dissipation parts, ensuring that it can still maintain good performance under long-term high temperature and high-intensity use conditions. That is, the present application greatly improves the comprehensive performance of copper alloy heat dissipation parts through innovative alloy composition design, refining treatment process and optimization of heat treatment process. Compared with existing technologies, it has higher hardness, tensile strength, conductivity and softening temperature, making copper alloy heat dissipation parts more reliable under high temperature, strong and long-term use conditions, and has a wider application prospect. It is particularly suitable for heat dissipation parts in high-demand electronic equipment and power systems.

[0075] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for casting a copper alloy heat dissipation part, characterized in that: The following steps are involved: According to the mass ratio of metal chromium of 0.1%-0.25%, the mass ratio of rare earth La of 0.04%-0.06%, the mass ratio of phosphor copper deoxidizer of 0.03% and the balance of electrolytic copper plate, metal chromium and electrolytic copper plate are loaded into the crucible, rare earth La and phosphor copper deoxidizer are loaded into the secondary charging hopper, and smelting is started; When all the metal in the crucible is melted, high-purity argon is charged into the furnace at a rate of 0.8L / min-1.2L / min to start refining; after the refining is completed, phosphor copper deoxidizer and rare earth La are added through the secondary feeding funnel to perform deoxidation and grain refinement; after deoxidation and grain refinement, the metal liquid is fully fused and then casting is started; after the casting is completed, it is cooled to obtain an alloy blank; The alloy blank is subjected to solution treatment, aging treatment and shot peening treatment in sequence, and then mechanical processing is adopted to obtain a copper alloy heat dissipation part.

2. The casting method of the copper alloy heat dissipation component according to claim 1, characterized in that: The step of placing metal chromium and electrolytic copper plates into a crucible, placing rare earth La and phosphorus copper deoxidizer into a secondary charging hopper, and starting smelting comprises: Put metal chromium and electrolytic copper plate into the crucible, rare earth La and phosphor copper deoxidizer into the secondary feeding hopper, close the vacuum induction furnace, close the vent valve; start the mechanical pump to evacuate the vacuum, and when the vacuum pressure in the furnace is р≤0.08MPa, start the Roots pump to start smelting.

3. The casting method of the copper alloy heat dissipation component according to claim 1, characterized in that: After all the metal in the crucible is melted, high-purity argon is charged into the furnace at a rate of 0.8L / min-1.2L / min to start the refining step, including: When the vacuum pressure in the furnace is р≤10Pa, the power is increased to 10±2KW for heating treatment for 5min, the power is increased to 20±2KW for heating treatment for 10min, the power is increased to 40±2KW for heating treatment for 10min, and the power is increased to 65KW for heating treatment until all the metal in the crucible is melted, then the power is reduced to 20KW, the argon valve is opened, and high-purity argon is filled into the furnace body at a rate of 0.8L / min-1.2L / min. When the pressure in the furnace rises to -0.08MPa, the argon filling valve is closed, and the power is increased to 65KW for refining treatment for 4min-5min.

4. The casting method of the copper alloy heat dissipation component according to claim 1, characterized in that: The total time of the deoxidation treatment and the grain refinement treatment is 20s-30s; the total casting time of the casting treatment is 20s-25s; and the cooling time is 20min.

5. The casting method of the copper alloy heat dissipation component according to claim 1, characterized in that: The solution treatment comprises: placing the alloy blank into a quenching furnace, heating to 985°C±10°C, keeping the temperature for 1h-1.5h, cooling for 5min, and draining for 2min.

6. The casting method of the copper alloy heat dissipation component according to claim 1, characterized in that: The aging treatment comprises: placing the alloy blank after the solid solution treatment into an aging furnace, keeping the temperature at 485±10° C. for 4 hours, and air cooling the furnace to perform the aging treatment.

7. A copper alloy heat dissipation component, characterized in that: Obtained by casting according to any one of claims 1 to 6, the electrical conductivity of the copper alloy heat dissipation component is >95% / IACS.

8. A copper alloy heat dissipation component, characterized in that: Obtained by casting using the method according to any one of claims 1 to 6, the copper alloy heat dissipation component has a hardness HV>115.

9. A copper alloy heat dissipation component, characterized in that: Obtained by casting using the method according to any one of claims 1 to 6, the copper alloy heat dissipation component has a tensile strength of >400 MPa.

10. A copper alloy heat dissipation component, characterized in that: Obtained by casting according to any one of claims 1 to 6, the copper alloy heat dissipation component has a softening temperature > 400°C.

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