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A process for preparing aluminum oxide dispersion strengthened copper with high strength and high conductivity

A dispersion-strengthened copper and high-conductivity technology is applied in the field of preparation of high-strength and high-conductivity alumina dispersion-strengthened copper, which can solve the problems of product structure, poor performance, complicated procedures, and increased cost, and achieve excellent high-temperature softening resistance. Performance, product quality stability, the effect of improving performance and life

Inactive Publication Date: 2009-11-25
CENT SOUTH UNIV
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Problems solved by technology

[0004] The existing internal oxidation process has the following disadvantages: because the product is made by powder metallurgy, there will be a certain amount of pores in the product, and the pores are more likely to absorb oxygen at high temperatures, so the existing internal oxidation process uses heat Extrusion to shape the product will lead to oxidation of the product, which will make the structure and performance of the final product poor; and if the atmosphere protection or hot extrusion under vacuum is used, additional equipment will be added, which will greatly increase the cost and complicated process

Method used

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  • A process for preparing aluminum oxide dispersion strengthened copper with high strength and high conductivity
  • A process for preparing aluminum oxide dispersion strengthened copper with high strength and high conductivity

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Experimental program
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Effect test

Embodiment 1

[0025] see figure 2 , the aluminum content is 0.1wt%, the rest is copper as the matrix material, and the copper-aluminum alloy powder with the impurity content less than 0.5wt% is used as the raw material.

[0026] (1) Mixing of Cu-Al alloy powder and oxidant: Mix the mixed powder of Cu-Al alloy powder and oxidant in a planetary ball mill at 200 rpm for 0.5 hour, the oxygen content in the oxidant is in atomic ratio to the aluminum content in the alloy powder is 3:2;

[0027] (2) Internal oxidation: heat the mixed powder to 800°C, and internally oxidize for 3 hours under a nitrogen atmosphere;

[0028] (3) Reduction: Reduction in a hydrogen atmosphere at 750°C for 1 hour;

[0029] (4), pressing: the powder at 600N / mm 2 Molded under pressure;

[0030] (5), sintering: sintering in a hydrogen atmosphere at 1050°C for 1 hour;

[0031] (6) Densification treatment: directly deform the sintered body by 40% under high pressure on the hydraulic press to make the relative density r...

Embodiment 2

[0035] see figure 2 , using copper-aluminum alloy powder with an aluminum content of 0.6wt%, the rest being copper as a base material, and an impurity content of less than 0.5wt% as a raw material;

[0036] (1), Cu-Al alloy powder is mixed with oxidizing agent: the mixed powder of Cu-Al alloy powder and oxidizing agent is mixed in drum mixer for 3 hours, and the atomic ratio of oxygen content in oxidizing agent and aluminum content in alloy powder is 4: 2;

[0037] (2) Internal oxidation: heat the mixed powder to 1000°C, and perform internal oxidation under nitrogen atmosphere for 1 hour;

[0038] (3) Reduction: Reduction in a hydrogen atmosphere at 1000°C for 1 hour;

[0039] (4), pressing: the powder at 600N / mm 2 Molded under pressure;

[0040] (5), sintering: sintering in a hydrogen atmosphere at 850°C for 4 hours;

[0041] (6) Densification treatment: the sintered body is pressed and deformed again in a mold to make its relative density reach 98%, and then annealed in ...

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Abstract

The invention provides a process for preparing aluminum oxide dispersion strengthened copper with high strength and high conductivity, wherein the Cu-Al alloy powder contains 0.1-0.6 wt% of Al and less than 0.5 wt% of impurity, and cuprous oxide is used as an oxidizing agent. The alloy is directly executed cold deformation after sintered and densification treatment, which avoids thermal deformation process in traditional preparation technique. The prepared aluminum oxide dispersion strengthened copper composite material has performances of high strength, high conductivity and excellent high temperature anti-softening, wherein the tensile strength is larger than 500N / mm, the electric conductivity is larger than 80% IACS, and the softening temperature is higher than 600 DEG C; and the tensile strength is larger than 400N / mm after annealing at 950 DEG C for 30min. The aluminum oxide dispersion strengthened copper is ideal material for making a lead frame of an integrate circuit, aerial extension of high speed electrified railroad, a resistance welding electrode, large thrust rocket engine inside lining, etc.

Description

technical field [0001] The invention relates to a preparation process of high-strength and high-conductivity aluminum oxide dispersion-strengthened copper. Background technique [0002] Alumina dispersion strengthened copper matrix composites are widely used in integrated circuit lead frames, high-speed electrified railway overhead lines, resistance welding electrodes in automobile and color tube industries, large High-tech fields such as thrust rocket engine linings are key materials for the development of modern electronic information and energy industries. Especially in the past ten years, with the rapid development of the automobile industry, information industry and microelectronics industry, alumina dispersion strengthened copper has also been greatly developed, and its excellent performance has shown its irreplaceability, which has attracted attention at home and abroad. Wide attention of many enterprises and scientific research institutes. Copper and copper alloys ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22F1/08C21D1/30C21D1/74
Inventor 罗丰华高翔
Owner CENT SOUTH UNIV
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