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Compact dispersion-strengthened copper-base composite material

A dispersion-strengthened copper and composite material technology, which is applied in the field of dispersion-strengthened copper-based composite materials and its preparation, can solve the problems of low density of sintered billets, low grain boundary strength, surface grain boundary oxidation, etc., and achieve the elimination of residual pores and Effects of defects, high resistance to softening temperature, and high densification

Active Publication Date: 2014-11-26
YANTAI WANLONG VACUUM METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During hot processing and heating, it is easy to cause surface grain boundary oxidation, resulting in low grain boundary strength and cracking during hot forging
Due to the problem of hot forging, it is basically limited to the field of resistance welding materials and electronic small parts, which limits the application of this material
[0003] However, the sintered compacts of dispersion strengthened copper matrix composites prepared by traditional production methods are generally not high in density, especially when the cross section is large, it is impossible to further achieve a large deformation ratio. Generally, it can only reach about 97.5% of the theoretical density. Quantitative porosity exists, making the mechanical and physical properties of the final product poor

Method used

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Examples

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Effect test

preparation example Construction

[0033] A method for preparing a dense dispersion-strengthened copper-based composite material, comprising the following steps:

[0034] 1) Add electrolytic copper in the vacuum induction furnace for smelting, add copper-phosphorus master alloy for deoxidation after melting for 3-5 minutes, then add copper-aluminum master alloy and melt at 1200-1300℃ for 5-10 minutes, Then use 5-15Mpa nitrogen or water mist to atomize and make powder to prepare copper-aluminum alloy powder;

[0035] 2) The copper-aluminum alloy powder prepared in step 1) is first oxidized in an air atmosphere at a temperature of 300-400° C. for 60-180 minutes, and then passed through nitrogen to carry out internal oxidation at a temperature of 800-950° C. , and keep it warm for 90 to 180 minutes to obtain an internally oxidized powder;

[0036] 3) Pass the internally oxidized powder obtained in step 2) into hydrogen or ammonia decomposition gas for reduction at a temperature of 800-950° C., and keep it warm fo...

Embodiment 1

[0042] Based on the percentage of the total weight of the copper-based composite material: alumina accounts for 0.58%, silver accounts for 2.0%, copper accounts for 97.42%, and the theoretical density is 8.864g / cm 3 .

[0043] The preparation method of the above-mentioned dense dispersion-strengthened copper-based composite material comprises the following steps:

[0044] 1) Add electrolytic copper in the vacuum induction furnace for smelting, add copper-phosphorus master alloy for deoxidation for 3 minutes after melting, then add copper-aluminum master alloy for 10 minutes at 1200°C, and then use 5Mpa nitrogen or Copper-aluminum alloy powder is produced by atomizing water mist to make powder;

[0045] 2) The copper-aluminum alloy powder prepared in step 1) is first oxidized in an air atmosphere at a temperature of 300° C. for 180 minutes, then passed through nitrogen to carry out internal oxidation at a temperature of 800° C., and kept for 180 minutes. Obtain the powder aft...

Embodiment 2

[0051] Based on the percentage of the total weight of the copper-based composite material: alumina accounts for 0.58%, silver accounts for 0.36%, copper accounts for 99.06%, and the theoretical density of the alloy is 8.841g / cm 3 .

[0052] The preparation method of the above-mentioned dense dispersion-strengthened copper-based composite material comprises the following steps:

[0053] 1) Add electrolytic copper in the vacuum induction furnace for smelting, add copper-phosphorus master alloy for deoxidation for 5 minutes after melting, then add copper-aluminum master alloy for 5 minutes at 1300°C, and then use 15Mpa nitrogen or Copper-aluminum alloy powder is produced by atomizing water mist to make powder;

[0054] 2) The copper-aluminum alloy powder prepared in step 1) is first oxidized in an air atmosphere at a temperature of 400° C. for 60 minutes, and then passed through nitrogen to carry out internal oxidation at a temperature of 950° C. and kept for 90 minutes. Obtain...

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Abstract

The invention relates to a compact dispersion-strengthened copper-base composite material and a preparation method thereof. The compact dispersion-strengthened copper-base composite material is composed of a copper alloy base and Al2O3 particles which are uniformly dispersed in the copper alloy base. Composite metals are added into the copper-alumina master alloy, and a vacuum induction hot-pressing furnace or low-pressure isostatic sintering furnace is adopted for sintering to maximally eliminate the residual porosity and defects in the alloy, so that the sintered billet basically reaches the theoretical density. The prepared dispersion-strengthened copper product has the advantages of high electric conductivity, high softening temperature resistance and high compactness, and can achieve more than 99.5% of theoretical density.

Description

technical field [0001] The invention relates to a dense dispersion-strengthened copper-based composite material and a preparation method thereof, belonging to the scientific and technical field of metal-based composite materials. Background technique [0002] By adding oxide particles into the copper matrix as a reinforcing phase and making them uniformly dispersed in the copper matrix, the mechanical properties and high temperature softening resistance of the copper matrix composite can be improved without reducing the electrical conductivity too much. Copper-alumina composite material not only has high strength at room temperature, excellent electrical and thermal conductivity, but also has good arc corrosion resistance, wear resistance and high temperature stability, and is a composite material with broad application prospects. Because the manufacturing process of copper-alumina composite material is a powder metallurgy process, the density is difficult to reach 100%, so ...

Claims

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Application Information

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IPC IPC(8): C22C9/00C22C1/05
Inventor 王风德周舟王肇飞张宗宁唐明明
Owner YANTAI WANLONG VACUUM METALLURGY
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