A kind of high-performance copper alloy and its powder preparation method

A technology for powder preparation and copper alloys, applied in the field of copper alloys and powder metallurgy materials, can solve the problem that the alloy cannot meet high strength and high electrical conductivity at the same time, the coarse primary second phase has no obvious improvement effect, and it is difficult to refine the primary phase, etc. problems, to achieve uniform composition and microstructure, to achieve effective regulation, and the effect of inhibiting the formation of

Active Publication Date: 2021-07-20
CENT SOUTH UNIV
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Problems solved by technology

[0007] (1) The Cu-Cr-Zr alloy prepared by the casting forming method forms a coarse and hard second phase during the casting process, which is difficult to improve through deformation processing and affects the properties of the alloy
[0008] (2) Subsequent treatments such as solution treatment, deformation processing and aging can refine the structure, but have no obvious improvement effect on the coarse primary second phase formed by casting
[0009] (3) Mechanical ball milling can refine the structure, but the easily introduced impurities such as Fe, O, and C affect the conductivity of the alloy
[0010] In conclusion, Cu-Cr-Zr alloys reported so far are easy to form a coarse hard second phase, which affects the properties of the alloy; through equal-diameter angular extrusion, multi-pass rolling, and aging treatment, the structure can be refined and the precipitation of Cr particles can be promoted. Thereby improving the performance of the alloy, but it is difficult to refine the primary phase; through ball milling modification, the second phase can be refined, but a large amount of impurities will be introduced, which will reduce the performance of the alloy
Therefore, the prepared alloy cannot meet the requirements of high strength and high electrical conductivity at the same time.

Method used

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  • A kind of high-performance copper alloy and its powder preparation method
  • A kind of high-performance copper alloy and its powder preparation method
  • A kind of high-performance copper alloy and its powder preparation method

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Experimental program
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Effect test

Embodiment 1

[0053] Embodiment 1: Alloy A and powder preparation thereof

[0054] According to the nominal composition of alloy A in Table 1, alloy raw materials are prepared, and pure metals Cu, Cr, Zr and M (M is RE (La: Ce: Yb (mass ratio) = 1:3:1) are prepared in a water-cooled copper crucible magnetic levitation melting furnace ), Mg, Ag, B mixture, its specific ratio is: RE:Mg:Ag:B (mass ratio) = 3:1:2:1) and other alloy raw materials for vacuum melting, the vacuum degree is 5.0×10 -1 Pa, using argon protection; after the raw materials are melted and completely alloyed, adjust the melt temperature to about 1600°C, and then use argon to atomize to prepare powder, the atomization pressure is 3.5MPa~3.6MPa; The copper alloy powders were sieved in a vacuum glove box and stored in vacuum packaging. The powder extraction rate of fine powder is 90%.

[0055] The prepared powder chemical composition analysis results are shown in Table 1, and its particle size distribution is shown in Table...

Embodiment 2

[0056] Embodiment 2: Alloy B and its powder preparation

[0057] According to the nominal composition of alloy B in Table 1, pure metals are taken, and raw materials Cu, Cr, Zr and M (M is a mixture of RE (La:Ce:Yb (mass ratio)=1:3:1), Mg, Ag, Si , and its specific ratio is: RE:Mg:Ag:Si (mass ratio) = 3:1:2:1) is melted in a vacuum induction melting furnace with a vacuum degree of 4.0×10 -1 Pa, protected by argon; after the raw materials are melted and completely alloyed, the melt temperature is adjusted to 1400°C, and then argon is used for atomization to prepare powder. The atomization pressure is 3.5MPa-3.6MPa; the copper alloy powder prepared by atomization is screened in a vacuum glove box and stored in vacuum packaging. The powder yield of fine powder is 84%.

[0058] The prepared powder chemical composition analysis results are shown in Table 1, and the powder morphology is shown in Table 1. Figure 5 , good sphericity and uniform particle size distribution. Powder ...

Embodiment 3

[0059] Embodiment 3: Alloy C and its powder preparation

[0060] According to the nominal composition of alloy C in Table 1, pure metal is taken, and the raw materials Cu, Cr, Zr and M, M is a mixture of (La:Ce:Yb=1:3:1), Mg, Ag, Ga, and its specific ratio For RE:Mg:Ag:Ga (mass ratio) = 3:1:2:1), it is melted in the water-cooled copper crucible of the magnetic levitation atomization equipment, and the vacuum degree is 5×10 -1 Pa, protected by argon gas; after the raw materials are melted and completely alloyed, the melt temperature is adjusted to about 1500°C, and then argon gas is used for atomization to prepare powder. The atomization pressure is 3.5MPa-3.6MPa; the copper alloy powder prepared by atomization is screened in a vacuum glove box and stored in vacuum packaging. The powder yield of fine powder is 86%.

[0061] The prepared powder chemical composition analysis results are shown in Table 1, and the powder morphology is shown in Table 1. Figure 7 , good sphericit...

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Abstract

The invention relates to a high-performance copper alloy and its powder preparation method. The copper alloy includes Cu, Cr, Zr and M. Wherein, the mass percentage of Cr is 0.1-5.0%; the mass percentage of Zr is 0.1-5.0%; M is composed of at least 2 kinds of Mg, Ag, B, Ga, Si, Li, Ti, Fe, Mn and RE, The mass percentage of M is 0.05-0.5%; RE is selected from at least 3 kinds of Ce, La, Yb, Pr, Nd and Sm. The present invention adopts gas atomization to prepare Cu-Cr-Zr-M copper alloy powder. The powder is a supersaturated solid solution with uniform composition and fine microstructure. The preparation process of the present invention is simple. it is good. The bulk material prepared from the powder has the characteristics of excellent electrical and mechanical properties.

Description

technical field [0001] The invention relates to a high-performance copper alloy and a powder preparation method thereof, belonging to the field of copper alloy and powder metallurgy materials. [0002] technical background [0003] Cu-Cr-Zr alloy has good electrical and thermal conductivity, but also has high strength, good wear resistance, corrosion resistance and high temperature and low cycle fatigue resistance, and is widely used in electrical, electronic, transportation and machinery manufacturing and other fields. [0004] At present, Cu-Cr-Zr series copper alloys are mainly produced by casting. However, the Cu-Cr-Zr alloy is prepared by smelting and casting technology, the melt cooling rate is slow, resulting in coarse microstructure and composition segregation, and the formation of coarse hard second phase particles, which are difficult to eliminate through subsequent processing, seriously reducing the alloy properties . High-temperature solid solution (920-980°C) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/02C22C1/04C22F1/08B22F1/00B22F9/08
CPCB22F1/0003B22F9/082B22F2009/0848C22C1/02C22C1/0425C22C9/00C22F1/08
Inventor 刘祖铭赵凡黄伯云吕学谦李全彭凯陈仕奇
Owner CENT SOUTH UNIV
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