A TaB2 / Cu composite material for electrical contact and its preparation method

Abstract

This invention discloses a TaB2 / Cu composite material for electrical contacts and its preparation method. The composite material, by mass percentage, comprises 95-99.5% Cu and 0.5-5% TaB2. The preparation method includes: independently melting Cu-Ta master alloy, Cu raw material, and B raw material, followed by in-situ reaction to obtain a cast TaB2 / Cu composite material; hot forging the cast TaB2 / Cu composite material followed by cold rolling; and finally annealing the cold-rolled material. This invention introduces TaB2 ceramic particles into a copper matrix, combining the high melting point, high strength, and arc erosion resistance of the boride ceramic phase with the high conductivity of pure copper, resulting in a copper-based composite material with high conductivity, low mass loss, and stable contact resistance.

Description

Technical Field

[0001] This invention belongs to the field of copper-based composite material technology, specifically relating to a TaB2 / Cu composite material for electrical contact and its preparation method. Background Technology

[0002] With the development of DC fast charging technology for new energy vehicles, the requirements for the comprehensive performance of electrical contact materials are constantly increasing. Developing novel electrical contact materials that couple conductivity and arc erosion resistance is of great significance. Currently, copper alloys and copper-based composites are promising candidate materials to meet these application requirements. Copper alloys resist arc erosion and improve the material's electrical contact performance through the eutectic phase generated during solidification or the nano-precipitates formed during post-processing. However, due to the low melting point of the eutectic phase and the thermodynamic instability of the nano-precipitates, the eutectic phase volatilizes and the nano-precipitates dissolve back during electrical contact, weakening the strengthening effect and causing severe mass loss in the electrical contact material. Copper-based composite materials introduce ceramic particles such as oxides, nitrides, and carbides into the copper matrix to increase the viscosity of the molten metal in the electrical contact pool, suppressing the flow, splashing, and volatilization of the molten copper and reducing material mass loss. Simultaneously, the high melting point and chemical stability of the ceramic particles overcome volatilization and re-dissolution problems. However, the density difference and poor wettability between the reinforcing phase and Cu cause the reinforcing phase to easily agglomerate on the surface of the electrical contact material, increasing contact resistance and consequently intensifying arc energy and temperature rise, ultimately leading to welding failure. Furthermore, oxide, nitride, and carbide ceramic materials have band gaps and poor conductivity, causing conductivity loss upon introduction. In summary, addressing the mass loss problems of existing copper alloys and the conductivity and contact resistance issues of copper-based composite materials, it is necessary to develop a novel copper-based composite material for electrical contacts that combines high conductivity, low mass loss, and stable contact resistance. Summary of the Invention

[0003] To address the material requirements in the field of DC fast charging for new energy vehicles and overcome the problem of unstable contact resistance caused by surface segregation of the reinforcing phase in copper-based composite materials for electrical contacts, one objective of this invention is to provide a TaB2 / Cu composite material for electrical contacts, using TaB2 ceramic, which has a higher density than Cu, a high melting point, resistance to arc erosion, and electrical conductivity, as the reinforcing phase. This results in a composite material with high conductivity, low mass loss, and stable contact resistance.

[0004] Another object of the present invention is to provide a method for preparing TaB2 / Cu composite material for electrical contacts. The alloy prepared by this method has uniform composition and stable structure, and the prepared composite material for electrical contacts has good conductivity, stable contact resistance and low mass loss.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of the present invention is to provide a TaB2 / Cu composite material for electrical contact, comprising, by mass percentage, 95-99.5% Cu and 0.5-5% TaB2.

[0006] A second aspect of the present invention is to provide a method for preparing a TaB2 / Cu composite material for electrical contacts, comprising the following steps: The Cu-Ta master alloy, Cu raw material and B raw material were independently melted and then reacted in situ to obtain the as-cast TaB2 / Cu composite material. The as-cast TaB2 / Cu composite material is hot-forged, then cold-rolled, and finally annealed to obtain the TaB2 / Cu composite material for electrical contact.

[0007] Furthermore, the Cu-Ta master alloy was prepared by induction melting under vacuum conditions.

[0008] Furthermore, the vacuum level under vacuum conditions is 5 × 10⁻⁶. -3 Pa~5×10 -5 Pa, melting temperature is 1200 ℃~1500℃, melting time is 10 s~2 min; Cu-Ta master alloy, by mass percentage, includes 90~95% Cu and 5~10% Ta.

[0009] Furthermore, the as-cast TaB2 / Cu composite material is prepared by the following process: under argon protection, Cu-Ta master alloy, Cu raw material and B raw material are melted separately and then injected into a reaction vessel under argon protection. The reaction is carried out at 1400~1600 ℃ for 10~60 s, and then poured into a mold to obtain the as-cast TaB2 / Cu composite material.

[0010] Furthermore, the temperature for independent melting is 1200~1600 ℃, and the time is 1~5 min.

[0011] Furthermore, the as-cast TaB2 / Cu composite material comprises, by mass percentage, 95-99.5% Cu and 0.5-5% TaB2.

[0012] Furthermore, the hot forging temperature is 800~950 ℃, the total deformation of hot forging is 10~90%, and the deformation per pass is 5%.

[0013] Furthermore, the total cold rolling deformation in the cold rolling process is 10-90%, and the deformation per pass is 5%.

[0014] Furthermore, the annealing temperature is 300~550 ℃, and the annealing time is 5 min~2 h.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) Since Ta has extremely low solid solubility in copper, the scattering effect of Ta solid solution on electrons in copper matrix is ​​avoided. At the same time, the special crystal structure of TaB2 ceramic has good electron transport ability, so TaB2 / Cu composite material has high conductivity, which is beneficial to charge transport during electrical contact process and reduces energy loss caused by Joule effect.

[0016] (2) The density of TaB2 ceramic is higher than that of pure copper, so it is not easy to float to the contact surface in the electrical contact molten pool, which reduces the tendency of material agglomeration and ensures the stability of the material contact resistance. At the same time, the presence of TaB2 particles in the molten pool can increase the viscosity of the melt, inhibit the flow, splashing and volatilization of copper liquid, reduce material mass loss and improve electrical life.

[0017] (3) This invention relies only on simple casting and thermomechanical deformation processes, which are simple and have a short cycle. The prepared TaB2 / Cu composite material for electrical contact has the characteristics of high conductivity, low mass loss and stable contact resistance, and has industrial production value. Attached Figure Description

[0018] Figure 1 This is a SEM image of the 2wt.% TaB2 / Cu composite material for electrical contact in Example 2 of the present invention; Figure 2 The graphs show the contact resistance curves of the electrical contact TaB2 / Cu composite material in Examples 1 and 2 of this invention after 100 disconnections under a load of 24 V and 10 A. Figure 3 The diagram shows the mass loss of the TaB2 / Cu composite material used for electrical contact in Examples 1 and 2 of this invention after 5000 electrical contact disconnection tests under a load of 24V and 10A. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0020] The TaB2 / Cu composite material for electrical contacts in this invention comprises two components: Cu and TaB2. The mass percentage of Cu is 95-99.5%, and the mass percentage of TaB2 is 0.5-5%, with the sum of the mass percentages of Cu and TaB2 being 100%. TaB2 is a boride ceramic phase formed by the reaction of Ta and B elements.

[0021] The preparation method of the TaB2 / Cu composite material for electrical contact in this invention includes the following steps: Step 1: Prepare a Cu-Ta master alloy. The Cu-Ta master alloy is prepared by induction melting and, by mass percentage, comprises 90-95% Cu and 5-10% Ta, with the sum of the mass percentages of all components being 100%. The induction melting is carried out under vacuum conditions, with a vacuum degree of 5 × 10⁻⁶. -3 Pa~5×10 -5 Pa was used, with a melting temperature of 1200 ℃~1500 ℃, a holding time of 10 s~2 min, and furnace cooling to obtain Cu-Ta master alloy.

[0022] Step 2: Prepare the as-cast TaB2 / Cu composite material. Under an argon atmosphere of -0.04 to -0.06 MPa (gauge pressure), the Cu-Ta master alloy, Cu blocks, and B particles are melted independently (i.e., the Cu-Ta master alloy, Cu blocks, and B particles are melted separately) at a melting temperature of 1200~1600 ℃ and held for 1~5 min. Then, the melted Cu-Ta master alloy, Cu, and B are injected into a reaction crucible to allow Ta and B to react in situ for 10~60 s before being poured into a mold to obtain the as-cast TaB2 / Cu composite material. The temperature of the reaction crucible is maintained at 1400~1600 ℃ before pouring. The Cu raw material is high-purity Cu blocks with a copper content ≥99.9%, and the B raw material is high-purity B particles with a boron content ≥99.9%. The prepared as-cast TaB2 / Cu composite material includes two components: Cu and TaB2, with mass percentages of Cu and TaB2 of 95~99.5% and 0.5~5%, respectively. The sum of the mass percentages of Cu and TaB2 is 100%.

[0023] Step 3: The as-cast TaB2 / Cu composite material obtained in Step 2 is subjected to thermomechanical treatment to obtain a TaB2 / Cu composite material for electrical contact. The thermomechanical treatment includes three steps: First, the as-cast TaB2 / Cu composite material is hot-forged at a temperature of 800–950 °C, with a total deformation of 10–90% and a deformation of 5% per pass. Then, the hot-forged material is cold-rolled with a total deformation of 10–90% and a deformation of 5% per pass. Finally, the cold-rolled material is annealed at a temperature of 300–550 °C for 5 min–2 h.

[0024] The following are specific examples.

[0025] Example 1 In this embodiment, the TaB2 / Cu composite material used for electrical contact is 1wt.% TaB2 / Cu, wherein the mass percentage of TaB2 ceramic phase is 1wt.% and the balance is Cu.

[0026] The preparation method of the TaB2 / Cu composite material for electrical contact includes the following steps: Step 1: Prepare a Cu-6 wt.%Ta master alloy (Cu mass percentage 94%, Ta mass percentage 6%). The Cu-6 wt.%Ta master alloy is prepared by induction melting under a vacuum of 5 × 10⁻⁶. -3 Pa, melting temperature of 1200 ℃, holding time of 30 s, and furnace cooling were used to obtain Cu-6 wt. %Ta master alloy.

[0027] Step 2: Prepare a cast 1wt.% TaB2 / Cu composite material. Under an argon atmosphere of -0.05 MPa (gauge pressure), separately melt the prepared Cu-6 wt.% Ta master alloy, Cu raw material, and B particles at a melting temperature of 1500 ℃ for 3 min. Then, pour the mixture into a reaction crucible and allow Ta and B to react for 30 s before casting into a mold to obtain the cast 1wt.% TaB2 / Cu composite material. The temperature of the reaction crucible is maintained at 1500 ℃ before casting. The Cu raw material is a high-purity Cu block with a copper content ≥99.9%, and the B raw material is a high-purity B particle with a boron content ≥99.9%. The obtained composite material includes two components: Cu and TaB2, with mass percentages of 99% and 1%, respectively.

[0028] Step 3: The as-cast 1wt.% TaB2 / Cu composite material obtained in Step 2 is subjected to thermomechanical treatment. First, hot forging is performed at 900 ℃, with a total deformation of 50% and a deformation per pass of 5%. Then, the hot-forged material is cold-rolled with a total deformation of 50% and a deformation per pass of 5%. Finally, the cold-rolled material is annealed at 450 ℃ for 1 h to obtain the 1wt.% TaB2 / Cu composite material for electrical contact.

[0029] The 1wt.%TaB2 / Cu composite material obtained in this embodiment has a conductivity of 99.1% IACS. Under the conditions of contact voltage of 24 V, contact current of 10 A, and contact pressure of 40 cN, 5000 electrical contact tests were conducted. The contact resistance first decreased and then remained stable, with an average contact resistance of 30.27 mΩ and a maximum contact resistance of 35.29 mΩ. The anode mass change was -0.23 mg, the cathode mass change was -0.30 mg, and the total mass loss was -0.53 mg.

[0030] Example 2 The TaB2 / Cu composite material for electrical contact prepared in this embodiment is a 2wt.% TaB2 / Cu composite material, wherein the content of TaB2 ceramic phase is 2wt.% and the balance is Cu.

[0031] The preparation method of the TaB2 / Cu composite material for electrical contact includes the following steps: Step 1: Prepare Cu-7 wt.%Ta master alloy. The Cu-7 wt.%Ta master alloy is prepared by induction melting with a vacuum degree of 1×10⁻⁶. -4 Pa, melting temperature of 1200 ℃, holding time of 50 s, and furnace cooling were used to obtain Cu-7 wt. %Ta master alloy.

[0032] Step 2: Prepare a cast 2wt.% TaB2 / Cu composite material. Under an argon atmosphere of -0.05 MPa (gauge pressure), separately melt the prepared Cu-7 wt.% Ta master alloy, Cu blocks, and B particles at a melting temperature of 1500 ℃ for 3 min. Then, pour the mixture into a reaction crucible and allow Ta and B to react for 30 s before dripping it into a water-cooled mold to obtain the cast 2wt.% TaB2 / Cu composite material. The temperature of the reaction crucible is maintained at 1500 ℃ before casting. The Cu raw material is a high-purity Cu block with a copper content ≥99.9%, and the B raw material is a high-purity B particle with a boron content ≥99.9%. The prepared composite material includes two components: Cu and TaB2, with Cu and TaB2 accounting for 98% and 2% by mass, respectively.

[0033] Step 3: The as-cast 2wt.%TaB2 / Cu composite material obtained in Step 2 is subjected to thermomechanical treatment. First, it is hot-forged at 900 ℃ with a total deformation of 50% and a deformation of 5% per pass. Then, the hot-forged material is cold-rolled with a total deformation of 50% and a deformation of 5% per pass. Finally, the cold-rolled material is annealed at 400 ℃ for 2 h to obtain the 2wt.%TaB2 / Cu composite material for electrical contact.

[0034] See Figure 1 As can be seen, the white particles represent the TaB2 phase, and the gray particles represent the Cu matrix. The TaB2 phase is uniformly distributed within the Cu matrix, with no obvious Ta or B residues. This demonstrates that the in-situ reaction proceeds fully in all regions of the melt, effectively reducing the interference of residual Ta and B elements on the material's conductivity and electrical contact performance. Simultaneously, the uniformly distributed TaB2 particles suppress the arc heating effect during electrical contact, reducing mass loss from the nearby Cu matrix and ensuring good electrical contact performance.

[0035] The 2wt.%TaB2 / Cu composite material obtained in this embodiment has a conductivity of 98.5% IACS. Under the conditions of contact voltage of 24 V, contact current of 10 A, and contact pressure of 40 cN, 5000 electrical contact tests were conducted. The contact resistance was stable, with an average contact resistance of 34.17 mΩ and a maximum contact resistance of 35.56 mΩ. The anode mass change was -0.20 mg, the cathode mass change was -0.20 mg, and the total mass loss was -0.4 mg.

[0036] The results of Examples 1 and 2 show that the TaB2 / Cu composite material exhibits good electrical conductivity close to that of pure copper, with conductivity >98% IACS in both examples. See also Figure 2 As can be seen, after 5000 electrical contacts, the contact resistance did not increase significantly with the number of contacts, but remained fluctuating around 30 mΩ, demonstrating good contact resistance stability. Furthermore, the average contact resistance was less than 50 mΩ, meeting the usage requirements of electrical components. (See also...) Figure 3 It can be seen that the TaB2 / Cu composite cathode and anode exhibit minimal mass transfer, with a total mass loss of <1 mg after 5000 load cycles. With increasing TaB2 reinforcing phase content, cathode and anode material transfer and total mass loss decrease, while hardness increases. However, due to the decrease in conductivity caused by the increased reinforcing phase content, the material contact resistance slightly increases, but remains stable at around 50 mΩ. In summary, the TaB2 / Cu composite material possesses advantages such as high conductivity, stable contact resistance, and low mass loss, and its preparation process is stable, showing broad application prospects in key areas such as DC fast charging for new energy vehicles.

[0037] Example 3 In this embodiment, the TaB2 / Cu composite material for electrical contact includes two components: Cu and TaB2. The mass percentage of Cu is 97%, and the mass percentage of TaB2 is 3%.

[0038] The preparation method of the TaB2 / Cu composite material for electrical contact includes the following steps: Step 1: Prepare Cu-8 wt.%Ta master alloy. The Cu-8 wt.%Ta master alloy is prepared by induction melting with a vacuum degree of 5 × 10⁻⁶. -4 Pa, melting temperature of 1300 ℃, holding time of 1 min, and furnace cooling were used to obtain Cu-8 wt. %Ta master alloy.

[0039] Step 2: Prepare a cast 3 wt.% TaB2 / Cu composite material. Under an argon atmosphere of -0.05 MPa (gauge pressure), the Cu-8 wt.% Ta master alloy, Cu raw material, and B particles prepared in Step 1 were independently melted at 1500 ℃ and held for 5 min. The melted materials were then poured into a reaction crucible to allow Ta and B to react for 30 s before being cast into a mold to obtain the cast 3 wt.% TaB2 / Cu composite material. The reaction crucible temperature was maintained at 1500 ℃ before casting. The Cu raw material was high-purity Cu ingot with a copper content ≥99.9%, and the B raw material was high-purity B particles with a boron content ≥99.9%. The resulting composite material contained both Cu and TaB2 components, with Cu comprising 97% by mass and TaB2 comprising 3% by mass.

[0040] Step 3: The as-cast 3wt.%TaB2 / Cu composite material obtained in Step 2 is subjected to thermomechanical treatment. First, hot forging is performed at 850 ℃, with a total deformation of 60% and a deformation per pass of 5%. Then, the hot-forged material is cold-rolled with a total deformation of 90% and a deformation per pass of 5%. Finally, the cold-rolled material is annealed at 450 ℃ for 2 h to obtain the 3wt.%TaB2 / Cu composite material for electrical contact.

[0041] Example 4 In this embodiment, the TaB2 / Cu composite material for electrical contact includes two components: Cu and TaB2. The mass percentage of Cu is 95%, and the mass percentage of TaB2 is 5%.

[0042] The preparation method of the TaB2 / Cu composite material for electrical contact includes the following steps: Step 1: Prepare Cu-10 wt.%Ta master alloy. The Cu-10 wt.%Ta master alloy is prepared by induction melting with a vacuum degree of 5 × 10⁻⁶. -5 Pa, melting temperature of 1500 ℃, holding time of 30 s, and furnace cooling were used to obtain Cu-10 wt.%Ta master alloy.

[0043] Step 2: Prepare a cast 5wt.% TaB2 / Cu composite material. Under an argon atmosphere of -0.06 MPa (gauge pressure), the Cu-10 wt.% Ta master alloy, Cu raw material, and B particles prepared in Step 1 were independently melted at 1600 ℃ and held for 5 min. The melted materials were then poured into a reaction crucible to allow Ta and B to react for 60 s before being cast into a mold to obtain the cast 5wt.% TaB2 / Cu composite material. The temperature of the reaction crucible was maintained at 1600 ℃ before casting. The Cu raw material was high-purity Cu ingot with a copper content ≥99.9%, and the B raw material was high-purity B particles with a boron content ≥99.9%. The resulting composite material contained both Cu and TaB2 components, with Cu comprising 95% by mass and TaB2 comprising 5% by mass.

[0044] Step 3: The as-cast 5wt.%TaB2 / Cu composite material obtained in Step 2 is subjected to thermomechanical treatment. First, hot forging is performed at 950 ℃, with a total deformation of 90% and a deformation of 5% per pass. Then, the hot-forged material is cold-rolled with a total deformation of 70% and a deformation of 5% per pass. Finally, the cold-rolled material is annealed at 550 ℃ for 2 h to obtain the 5wt.%TaB2 / Cu composite material for electrical contact.

[0045] Example 5 In this embodiment, the TaB2 / Cu composite material for electrical contact includes two components: Cu and TaB2. The mass percentage of Cu is 99.5%, and the mass percentage of TaB2 is 0.5%.

[0046] The preparation method of the TaB2 / Cu composite material for electrical contact includes the following steps: Step 1: Prepare Cu-10 wt.%Ta master alloy. The Cu-10 wt.%Ta master alloy is prepared by induction melting with a vacuum degree of 5 × 10⁻⁶. -3 Pa, melting temperature of 1400 ℃, holding time of 2 min, and furnace cooling were used to obtain Cu-10 wt.%Ta master alloy.

[0047] Step 2: Prepare a cast 0.5wt.% TaB2 / Cu composite material. Under an argon atmosphere of -0.04 MPa (gauge pressure), the Cu-10wt.%Ta master alloy, Cu raw material, and B particles prepared in Step 1 were independently melted at 1200 ℃ and held for 4 min. The melted materials were then poured into a reaction crucible to allow Ta and B to react for 10 s before being poured into a mold to obtain the cast 0.5wt.% TaB2 / Cu composite material. The temperature of the reaction crucible was maintained at 1400 ℃ before pouring. The Cu raw material was high-purity Cu ingot with a copper content ≥99.9%, and the B raw material was high-purity B particles with a boron content ≥99.9%. The resulting composite material contained both Cu and TaB2 components, with Cu accounting for 99.5% by mass and TaB2 accounting for 0.5% by mass.

[0048] Step 3: The as-cast 0.5wt.%TaB2 / Cu composite material obtained in Step 2 undergoes thermomechanical treatment. First, hot forging is performed at 800 ℃ with a total deformation of 10% and a deformation per pass of 5%. Then, the hot-forged material is cold-rolled with a total deformation of 10% and a deformation per pass of 5%. Finally, the cold-rolled material is annealed at 300 ℃ for 5 min to obtain the 0.5wt.%TaB2 / Cu composite material for electrical contact.

[0049] This invention introduces TaB2 ceramic particles into a copper matrix, combining the high melting point, high strength, and arc erosion resistance of the boride ceramic phase with the high conductivity of pure copper, to prepare a copper-based composite material with high conductivity, low mass loss, and stable contact resistance.

[0050] The above description is only of the preferred embodiment of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All variations made within the scope of the independent claims of the present invention are also within the scope of protection of the present invention.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. A TaB2 / Cu composite material for electrical contacts, characterized in that, It comprises 95-99.5% Cu and 0.5-5% TaB2 by mass percentage.

2. A method for preparing a TaB2 / Cu composite material for electrical contacts, characterized in that, Includes the following steps: The Cu-Ta master alloy, Cu raw material and B raw material were independently melted and then reacted in situ to obtain the as-cast TaB2 / Cu composite material. The as-cast TaB2 / Cu composite material is hot-forged, then cold-rolled, and finally annealed to obtain the TaB2 / Cu composite material for electrical contact.

3. The method for preparing the TaB2 / Cu composite material for electrical contact according to claim 2, characterized in that, Cu-Ta master alloys are prepared by induction melting under vacuum conditions.

4. The method for preparing the TaB2 / Cu composite material for electrical contact according to claim 3, characterized in that, The vacuum degree of the vacuum condition is 5x10 -3 Pa~5x10 -5 Pa, the smelting temperature is 1200 ℃~1500 ℃, and the smelting time is 10 s~2 min; the Cu-Ta intermediate alloy includes 90~95% of Cu and 5~10% of Ta in terms of mass percentage.

5. The method for preparing the TaB2 / Cu composite material for electrical contact according to claim 2, characterized in that, The as-cast TaB2 / Cu composite material is prepared by the following process: under argon protection, Cu-Ta master alloy, Cu raw material and B raw material are melted separately and then injected into a reaction vessel under argon protection. The reaction is carried out at 1400~1600 ℃ for 10~60 s, and then poured into a mold to obtain the as-cast TaB2 / Cu composite material.

6. The method for preparing the TaB2 / Cu composite material for electrical contact according to claim 5, characterized in that, The temperature for independent melting is 1200~1600 ℃, and the time is 1~5 min.

7. The method for preparing the TaB2 / Cu composite material for electrical contact according to claim 2, characterized in that, The as-cast TaB2 / Cu composite material, by mass percentage, comprises 95-99.5% Cu and 0.5-5% TaB2.

8. The method for preparing the TaB2 / Cu composite material for electrical contact according to claim 2, characterized in that, The hot forging temperature is 800~950 ℃, the total deformation of hot forging is 10~90%, and the deformation per pass is 5%.

9. The method for preparing the TaB2 / Cu composite material for electrical contact according to claim 2, characterized in that, The total deformation of cold rolling is 10-90%, and the deformation per pass is 5%.

10. The method for preparing the TaB2 / Cu composite material for electrical contact according to claim 2, characterized in that, The annealing temperature is 300~550 ℃, and the annealing time is 5 min~2 h.

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