Preparation method of Al2O3 dispersion strengthened copper alloy bar

A technology for dispersion strengthening copper and alloy rods, applied in the field of copper matrix composite materials, can solve the problems of decreased strength and conductivity, easy deformation of oxygen-free copper, low yield strength, etc., to improve production efficiency, good microstructure, and performance. excellent effect

Inactive Publication Date: 2012-11-28
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Although the conductivity of annealed pure copper is high (98-102% IACS), the strength is too low (σ 0.2 Only 40MPa), due to its low yield strength, oxygen-free copper is easily deformed
The high-conductivity copper alloys developed in recent years, such as Cu-Zr, Cu-B, Cu-Ag, etc., have a conductivity of more than 98% IACS, but after high-temperature annealing and stabilization treatment, the σ 0.2 It can only reach 80Mpa, and the yield strength is low, which affects its application in industry
Precipitation-strengthened copper alloys, such as Cu-Cr-Zr, Cu-Ni-Si, Cu-Fe-P, etc., although the strength index can reach σ b =500MPa, σ 0.2 = 450MPa, but the electrical conductivity is low, only about 75% IACS. After the alloy is stabilized by high-temperature annealing, the strength and electrical conductivity both drop sharply, and can only reach σ b =280MPa, σ 0.2 =80MPa, the conductivity is about 60%IACS

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] a kind of Al 2 o 3 A method for preparing a dispersion-strengthened copper alloy rod, comprising the following steps: using Cu-Al alloy powder, wherein the mass percentage of Al is 0.6%, and the powder particle size is -200 mesh, and the Cu-Al alloy powder is mixed with 1.4% of the weight of the powder. % CuO powder mixed, sealed in a stainless steel airtight container, vacuumed to 10 -2 Pa, heated to about 820°C for internal oxidation for about 12 hours, then crushed and sieved the alloy powder after internal oxidation, and reduced in a hydrogen reduction furnace at a reduction temperature of about 820°C for about 3 hours; to obtain Cu-Al 2 o 3 Alloy powder; then put the alloy powder into a copper sheath, the thickness of the sheath is about 0.5mm, vacuum sealing and welding, and then carry out hot extrusion treatment, the hot extrusion temperature is about 965°C; after cooling, turn and remove the copper on the surface skin, get Al 2 o 3 Dispersion strengthened c...

Embodiment 2

[0015] a kind of Al 2 o 3 A method for preparing a dispersion-strengthened copper alloy rod, comprising the following steps: using Cu-Al alloy powder, wherein the mass percentage of Al is 0.7%, and the particle size of the powder is -200 mesh, and the Cu-Al alloy powder is mixed with 1.2% of the weight of the powder. % CuO powder mixed, sealed in a stainless steel airtight container, vacuumed to 10 -2 Pa, heated to about 840°C for internal oxidation for about 10 hours, then crushed and sieved the alloy powder after internal oxidation, and reduced in a hydrogen reduction furnace at a reduction temperature of about 840°C for about 2 hours; to obtain Cu-Al 2 o 3 Alloy powder; then put the alloy powder into a copper sheath with a thickness of about 1mm, vacuum seal and weld, and then perform hot extrusion treatment at a temperature of about 955°C; after cooling, turn and remove the copper skin on the surface , get Al 2 o 3 Dispersion strengthened copper alloy rods.

Embodiment 3

[0017] a kind of Al 2 o 3 A method for preparing a dispersion-strengthened copper alloy rod, comprising the following steps: using Cu-Al alloy powder, wherein the mass percentage of Al is 0.65%, and the particle size of the powder is -200 mesh, and the Cu-Al alloy powder is mixed with 1.3% by weight of the powder. % CuO powder mixed, sealed in a stainless steel airtight container, vacuumed to 10 -2 Pa, heated to about 830°C for internal oxidation for about 11 hours, then crushed and sieved the alloy powder after internal oxidation, and reduced in a hydrogen reduction furnace at a reduction temperature of about 830°C for about 2.5 hours; to obtain Cu-Al 2 o 3 Alloy powder; then put the alloy powder into a copper sheath, the thickness of the sheath is about 0.8mm, vacuum seal welding, and then perform hot extrusion treatment, the hot extrusion temperature is about 960 ° C; after cooling, turn and remove the copper on the surface skin, get Al 2 o 3 Dispersion strengthened co...

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Abstract

The invention discloses a preparation method of a Al2O3 dispersion strengthened copper alloy bar, comprising the following steps: mixing a Cu-Al alloy powder with a CuO powder wherein the weight percent of the Al is 0.6-0.7%, the powder size of the Cu-Al alloy powder is 200 mesh and the weight of the CuO powder accounts for 1.2-1.4% of the weight of the Cu-Al alloy powder, loading the mixture powder into a stainless container, sealing the stainless container, vacuumizing the container to 10-2Pa, heating the mixture powder to about 820-840 DEG C and internally oxidizing the mixture powder for about 10-12 hour, crushing and screening the internally-oxidized alloy powder, reducing the alloy powder in a hydrogen reducing furnace at a reduction temperature of about 820-840 DEG C for about 2-3 hour; obtaining a Cu-Al2O3 alloy powder; loading the alloy powder into a copper plate sheath with thickness of about 0.5-1mm, vacuum soldering and sealing the sheath, hot pressing the sheath at about 955-965 DEG C; cooling and turning the pressed sheath to remove the copper plate on the surface, so as to obtain the Al2O3 dispersion strengthened copper alloy bar.

Description

technical field [0001] The invention relates to the field of copper-based composite materials, in particular to an Al 2 o 3 A method for preparing dispersion-strengthened copper alloy rods. Background technique [0002] Although the conductivity of annealed pure copper is high (98-102% IACS), the strength is too low (σ 0.2 Only 40MPa), due to its low yield strength, oxygen-free copper is easily deformed. The high-conductivity copper alloys developed in recent years, such as Cu-Zr, Cu-B, Cu-Ag, etc., have a conductivity of more than 98% IACS, but after high-temperature annealing and stabilization treatment, the σ 0.2 It can only reach 80Mpa, and the yield strength is low, which affects its application in industry. Precipitation-strengthened copper alloys, such as Cu-Cr-Zr, Cu-Ni-Si, Cu-Fe-P, etc., although the strength index can reach σ b =500MPa, σ 0.2 =450MPa, but the electrical conductivity is low, only about 75% IACS. After the alloy is stabilized by high-temperatur...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C1/05C22C9/00C22C32/00
Inventor李艳
OwnerSTATE GRID CORP OF CHINA