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A kind of preparation method of copper-iron alloy

A technology of copper-iron alloy and iron powder, applied in the field of preparation of copper-iron alloy, can solve the problems of difficulty in meeting high-strength copper-iron alloys, inability to prepare billets with uniform composition, poor wettability of Cu and Fe, etc., achieve uniform sintering shrinkage deformation, increase solid phase The effect of high diffusion rate and sintered relative density

Active Publication Date: 2022-05-20
JINTIAN COPPER GROUP CORP NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when preparing copper-iron alloys with high iron content, coarse iron phases will be precipitated during the solidification process, deteriorating the machinability of the slab, and ultimately resulting in poor performance of the finished product
[0005] (2) Composition segregation: previous studies only focused on the head-to-tail Fe content deviation of the copper-iron alloy slab, but a large number of studies and experiments have shown that there are also serious composition deviations in the center and edge of the copper-iron alloy slab
[0012] In summary, due to the liquid phase separation of copper-iron alloys with high iron content, traditional casting methods cannot prepare billets with uniform composition.
In the powder metallurgy method, due to oxides hindering sintering and poor wettability of Cu and Fe, the relative density of the billet prepared by the mechanical alloying method and simple mixing method is generally below 98%, and there are pores inside. easy to crack
Although repressing and refiring or subsequent thermal processing can increase the product density, the cost increases, the efficiency decreases, and the Fe grains are further coarsened during sintering, making it difficult to meet the requirements of high-strength copper-iron alloys

Method used

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  • A kind of preparation method of copper-iron alloy
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 and Example 3 were prepared by the method of the present invention, and the specific ingredients are shown in Table 1.

[0036] Example 1

[0037] The preparation steps of this copper-iron alloy:

[0038] 1) Preparation of Cu-coated Fe powder: According to the target composition, weigh iron powder and copper oxide powder for ball milling, the particle size ratio of iron powder and copper oxide powder is 20, and Fe powder is reduced iron powder, iron powder Particle size ≤ 2μm. The ball-to-material ratio is 5:1, the rotating speed is 300rpm, and the ball milling time is 30min to obtain the mixed powder;

[0039] The mixed powder was first reduced with hydrogen, the reduction temperature was 300°C, and the reduction time was 120 minutes; after the reduction, the temperature was continued to rise to 800°C, and the holding time was 5 hours to obtain Cu-coated Fe powder.

[0040] 2) Cold isostatic pressing: Encapsulate Cu-coated Fe powder in an elastic plastic m...

Embodiment 2

[0047] 1) Preparation of Cu-coated Fe powder: According to the target composition, weigh iron powder and copper oxide powder for ball milling, the particle size ratio of iron powder and copper oxide powder is 30, and Fe powder is reduced iron powder, iron powder Particle size ≤ 2μm. The ball-to-material ratio is 6:1, the rotating speed is 300rpm, and the ball milling time is 20min to obtain the mixed powder;

[0048] The mixed powder was first reduced with hydrogen, the reduction temperature was 250°C, and the reduction time was 80 minutes; after the reduction, the temperature was continued to rise to 750°C, and the holding time was 3 hours to obtain Cu-coated Fe powder.

[0049] 2) Cold isostatic pressing: Encapsulate Cu-coated Fe powder in an elastic rubber mold, seal it and put it into a high-pressure cylinder with a pressing force of 300MPa and a pressing time of 360s.

[0050] 3) Pre-sintering: pre-sintering the blank at 800° C. for 90 minutes in a hydrogen atmosphere. ...

Embodiment 3

[0056] 1) Preparation of Cu-coated Fe powder: According to the target composition, weigh iron powder and copper oxide powder for ball milling, the particle size ratio of iron powder and copper oxide powder is 25, and Fe powder is reduced iron powder, iron powder Particle size ≤ 2μm. The ball-to-material ratio is 7:1, the rotation speed is 250rpm, and the ball milling time is 25min to obtain the mixed powder;

[0057] The mixed powder was first reduced with hydrogen, the reduction temperature was 300°C, and the reduction time was 120 minutes; after the reduction, the temperature was continued to rise to 750°C, and the holding time was 5 hours to obtain Cu-coated Fe powder.

[0058] 2) Cold isostatic pressing: Encapsulate Cu-coated Fe powder in an elastic plastic mold, seal it and put it into a high-pressure cylinder with a pressing force of 200 MPa and a pressing time of 200 s.

[0059] 3) Pre-sintering: Pre-sintering the blank at 850° C. for 100 min in a hydrogen atmosphere. ...

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Abstract

The invention discloses a method for preparing a copper-iron alloy, which is characterized in that the mass percentage composition of the copper-iron alloy is 40.0-60.0 wt% Fe, and the balance is Cu and unavoidable impurities; the copper-iron alloy comprises the following preparation steps: 1 ) to prepare Cu-coated Fe powder: according to the target composition, weigh iron powder and copper oxide powder for ball milling and mixing. powder; the mixed powder is first subjected to hydrogen reduction, the reduction temperature is 250°C-300°C, and the reduction time is 60-120min; after the reduction is completed, continue to heat up to 700-800°C, and the holding time is 3-6h to obtain Cu-coated Fe powder; 2) Compression forming: the Cu-coated Fe powder is press-formed to obtain a billet. The copper-iron alloy of the invention has uniform distribution of copper and iron, high relative density, and excellent electrical conductivity and mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of copper alloys, and in particular relates to a preparation method of copper-iron alloys. Background technique [0002] At present, copper-iron alloy has the advantages of high electrical conductivity, high thermal conductivity, excellent ductility of copper and high strength of iron, electromagnetic shielding, wear resistance, etc., and its good machinability makes it possible to prepare by adjusting the composition and production process. Products with different shapes and properties are used in electromagnetic shielding materials, dissimilar alloy welding materials, high-conductivity and high-tension wires, heat dissipation materials, etc., so they have broad application prospects. At present, copper-iron alloy wires have been exported to South Korea and Japan, and are tested on new energy charging piles and automobile wiring harnesses, and try to use dissimilar alloy wires in the field of welding. Copp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/04C22C33/02C22C38/16
CPCC22C9/00C22C38/16C22C1/0425C22C33/0278
Inventor 周涛郑良玉王永如傅杰巢国辉张翼贺挺
Owner JINTIAN COPPER GROUP CORP NINGBO
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