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A kind of preparation method of high-temperature softening-resistant high-strength and high-conductivity copper-based composite material molding

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: 2022-07-26
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 molybdenum accounting for 0.5% (mass fraction) of the total mass of copper and molybdenum, copper chloride dihydrate and ammonium molybdate were weighed and dissolved in deionized water, stirred until completely dissolved, then sodium hydroxide was dissolved in water and added to the mixed solution , a blue-green precipitate was formed, and the precursor powder was obtained through centrifugation, filtration and drying. The obtained precursor powder was first reduced at 550 °C for 4 hours in a hydrogen atmosphere, and then introduced into methane gas, heated to 800 °C, held for 1 hour, cooled with the furnace, crushed and sieved to obtain nano-molybdenum carbide dispersion-strengthened copper base. Compound powder. Subsequently, the green body was obtained by cold isostatic pressing at a pressure of 100 MPa and a pressure holding of 10 s, and the vacuum degree was 10 - 2Microwave sintering at 950 °C for 5 h under Pa conditions, followed by hot extrusion a...

Embodiment 2

[0038] According to molybdenum accounting for 1% (mass fraction) of the total mass of copper and molybdenum, copper nitrate hexahydrate and sodium molybdate were weighed and dissolved in deionized water, stirred until completely dissolved, then sodium hydroxide was dissolved in water and added to the mixed solution, A blue-green precipitate is formed, and the precursor powder is obtained through centrifugation, filtration and drying. The obtained precursor powder was first reduced in a hydrogen atmosphere at 750 ° C for 1 h, then acetylene gas was introduced, the temperature was raised to 850 ° C, and the temperature was maintained for 2 hours. powder. Subsequently, the green body was obtained by cold isostatic pressing at a pressure of 400 MPa and a pressure holding of 300 s to obtain a green body, which was hot-pressed at 1000 °C for 3 hours in a hydrogen atmosphere, cooled to 800 °C with the furnace, and then hot rolled with a reduction of 60%. A fully dense, high-performa...

Embodiment 3

[0041] According to molybdenum accounting for 3% (mass fraction) of the total mass of copper and molybdenum, weigh copper sulfate pentahydrate and potassium molybdate and dissolve them in deionized water, stir until completely dissolved, then dissolve potassium hydroxide in water and add it to the mixed solution, A blue-green precipitate is formed, and the precursor powder is obtained through centrifugation, filtration and drying. The obtained precursor powder was first reduced in a hydrogen atmosphere at 700 ° C for 3 hours, then propane gas was introduced, the temperature was raised to 900 ° C, and the temperature was kept for 4 hours. powder. Then, the green body was obtained by cold isostatic pressing at a pressure of 200 MPa and a holding pressure of 120 s to obtain a green body, which was sintered by discharge plasma at 1050 °C for 1 h under a hydrogen atmosphere, and then cooled to 850 °C with the furnace for hot forging. Complete dense, high-performance nano-molybdenu...

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Abstract

The invention relates to the field of powder metallurgy, and relates to a method for preparing a high-temperature softening-resistant, high-strength and high-conductivity copper-based composite material forming part. The method comprises the following steps: preparation of precursor powder → preparation of nano-molybdenum carbide-copper composite powder → green body forming → combination densification In the step of co-precipitation-co-reduction-selective carbonization, nano-molybdenum carbide particles reinforced copper-based composite powder is prepared, and a cold isostatic pressing process is used to prepare a composite material body. , High conductivity, high wear resistance, high softening temperature of copper matrix composite moldings. The nano-scale molybdenum carbide particles in the copper-based composite material are stable at high temperature, and can hinder the movement of dislocations at room temperature and high temperature. It has important application prospects in the fields of high temperature and high thermal conductivity components of nuclear reactors.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and relates to a method for preparing nano-molybdenum carbide dispersion-strengthened copper-based composite material moldings by utilizing co-precipitation-co-reduction-selective carbonization powder milling combined with powder metallurgy technology. Background technique [0002] Copper alloys have the characteristics of high strength, high plasticity, and high electrical conductivity and thermal conductivity, and are 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 and high thermal conductivity components of nuclear reactors. Dispersion strengthening technology is an effective way to improve the high temperature properties of metal materials. Dispersion strengthening gen...

Claims

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Application Information

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Patent Type & Authority Patents(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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