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Preparation method of high-temperature-softening-resistant, high-strength and high-conductivity copper-based composite material molded part

A copper-based composite material and composite material technology, applied in the field of powder metallurgy, can solve the problems of high technical requirements of process and equipment, limited contribution of material strength, difficult to achieve bar preparation, etc., and achieve cheap raw materials, small impact, and consistent performance. good effect

Active Publication Date: 2022-04-08
北京科大京都高新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application is prepared by electron beam physical vapor deposition process, which has high technical requirements for process and equipment, and low deposition efficiency. It is limited to the preparation of thin plates, and it is difficult to realize the preparation of other shapes such as rods. At the same time, the size of the reinforcing phase is large, and its contribution to the strength of the material is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] According to the fact that molybdenum accounts for 0.5% (mass fraction) of the total mass of copper and molybdenum, weigh copper chloride dihydrate and ammonium molybdate and dissolve them in deionized water, stir until completely dissolved, then dissolve sodium hydroxide in water and add to the mixed solution , forming a blue-green precipitate, which was centrifuged, filtered, and dried to obtain a precursor powder. The obtained precursor powder was first reduced in a hydrogen atmosphere at 550°C for 4 hours, then methane gas was introduced, and the temperature was raised to 800°C. Composite powder. Subsequently, the green body was obtained by cold isostatic pressing at a pressure of 100 MPa and a pressure hold of 10 seconds. - 2Microwave sintering at 950°C for 5h under Pa condition, cooling to 450°C with the furnace, and then hot extrusion with an extrusion ratio of 16:1 to obtain fully dense, high-performance nano-molybdenum carbide dispersion-strengthened copper m...

Embodiment 2

[0038] According to the 1% (mass fraction) that molybdenum accounts for the total mass of copper and molybdenum, take copper nitrate hexahydrate and sodium molybdate and dissolve them in deionized water, stir until completely dissolved, then add sodium hydroxide into the mixed solution after dissolving in water, A blue-green precipitate was formed, and the precursor powder was obtained after centrifugation, filtration, and drying. The obtained precursor powder was first reduced in a hydrogen atmosphere at 750°C for 1 hour, then acetylene gas was introduced, and the temperature was raised to 850°C. After 2 hours of heat preservation, it was cooled in the furnace and then crushed and sieved to obtain nano-molybdenum carbide dispersion-strengthened copper-based composites. powder. Then, the green body is formed by cold isostatic pressing at a pressure of 400MPa and maintained for 300s, and is hot-pressed and sintered at 1000°C for 3 hours in a hydrogen atmosphere, and then hot-ro...

Embodiment 3

[0041] According to the 3% (mass fraction) that molybdenum accounts for the total mass of copper and molybdenum, copper sulfate pentahydrate and potassium molybdate are weighed and dissolved in deionized water, stirred until completely dissolved, and then potassium hydroxide is dissolved in water and added to the mixed solution. A blue-green precipitate was formed, and the precursor powder was obtained after centrifugation, filtration, and drying. The obtained precursor powder was first reduced in a hydrogen atmosphere at 700°C for 3 hours, then fed with propane gas, heated to 900°C, kept for 4 hours, cooled in the furnace, crushed and sieved to obtain nano-molybdenum carbide dispersion strengthened copper-based composites powder. Then, the green body was obtained by cold isostatic pressing at a pressure of 200MPa and a pressure of 120s. It was sintered by discharge plasma at 1050°C for 1h under a hydrogen atmosphere, cooled to 850°C with the furnace and then hot forged. The f...

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Abstract

The invention relates to the field of powder metallurgy, in particular to a preparation method of a high-temperature-softening-resistant high-strength high-conductivity copper-based composite material molded part, which comprises the steps of precursor powder preparation, nano molybdenum carbide-copper composite powder preparation, green body forming and combined densification. Nano molybdenum carbide particle reinforced copper-based composite powder is prepared through a co-precipitation-co-reduction-selective carbonization process, a composite material blank is prepared through a cold isostatic pressing forming process, and a copper-based composite material forming part with high strength, high conductivity, high wear resistance and high softening temperature is obtained after high-temperature sintering and deformation machining combined densification. The nanoscale molybdenum carbide particles in the copper-based composite material are stable at high temperature, can hinder dislocation movement at room temperature and high temperature, are remarkable in dispersion strengthening effect, have small influences on the electric conduction and heat conduction performance of the material and are excellent in comprehensive performance, and the copper-based composite material has important application prospects in the fields of heat dissipation grooves, electric resistance welding electrodes, nuclear reactor high-temperature-resistant high-heat-conduction components and the like.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and relates to a method for preparing a molded part of nanomolybdenum carbide dispersion-strengthened copper-based composite material by using co-precipitation-co-reduction-selective carbonization pulverization combined with powder metallurgy technology. Background technique [0002] Copper alloy has the characteristics of high strength, high plasticity and high electrical and thermal conductivity, and is widely used in electronic appliances, rail transit, aerospace and other fields. With the development of science and technology, copper alloys are required to have excellent high temperature resistance to meet the needs of extreme working conditions, such as high temperature resistant and high thermal conductivity components of nuclear reactors. Dispersion strengthening technology is an effective way to improve the high temperature performance of metal materials. Dispersion strengthening general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05B22F9/22B22F9/04C22C32/00C22C9/00B22F3/04B22F3/10B22F3/105B22F3/14B82Y30/00B82Y40/00B22F3/20B22F3/18B22F3/17H01B1/02H01B13/00C22C1/10C01B32/949
Inventor 刘勇
Owner 北京科大京都高新技术有限公司
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