Preparation method of nano-alumina reinforcing copper-based composite

A copper-based composite material and nano-alumina technology, applied in the field of copper-based composite material preparation, can solve the problems of uneven reaction, different degrees of segregation, inevitable precipitation of reinforced phase by internal oxidation method, etc.

Inactive Publication Date: 2011-04-27
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: (1) The process of the liquid-liquid reaction method is simple and the manufacturing cost is low, but there are different degrees of segregation and uneven reaction
(2) The conductivity of the material obtained by the liquid-solid reaction method is low (only 19.

Method used

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  • Preparation method of nano-alumina reinforcing copper-based composite
  • Preparation method of nano-alumina reinforcing copper-based composite
  • Preparation method of nano-alumina reinforcing copper-based composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Process steps: Weigh 0.1987g, 169.3029g and 134.7452g of aluminum nitrate nonahydrate, copper nitrate trihydrate and citric acid respectively. will contain Al(NO 3 ) 3 and Cu(NO 3 ) 2 The aqueous solution of the solution was mixed evenly, and citric acid (solid) was added, and the stirring was continued, so that the citric acid was completely dissolved, and a mixed solution was obtained. The pH of the mixed solution was adjusted to 1 by nitric acid. Place the mixed solution in a constant temperature furnace at 100°C for 12 hours until it becomes gelatinous. At this time, quickly place the gel on a muffle furnace and heat it to 400°C. The volume of the gel expands violently, and the temperature rises rapidly for 10 minutes. Finally, the container was taken out, and the burning residue was ground to obtain a black powder. The black powder was placed in a hydrogen protective atmosphere and heated and reduced at 350°C for 10 hours. At this time, Al with a volume fracti...

Embodiment 2

[0030] Process steps: Weigh 3.9735g, 164.4705g and 132.8355g of aluminum nitrate nonahydrate, copper nitrate trihydrate and citric acid respectively. According to the operation method of Example 1, successfully prepared Al with a volume content of alumina of 3.0% 2 o 3 / Cu composite powder 99.86cm 3 . The average particle diameter of the obtained composite powder was 52.64 nm.

[0031] The powder was pressed and sintered according to the method described in Example 1, and the hardness of the samples obtained after testing were 105.14HB and 135.98HB respectively before and after sintering; the electrical conductivity before and after sintering was 1.16×10 6 S / m and 17.45×10 6 S / m; the bending resistance before and after sintering is 986MPa and 1606MPa, and the compression resistance before and after sintering is 842MPa and 1025MPa respectively.

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Abstract

The invention relates to a preparation method of a nano-alumina reinforcing copper-based composite, comprising sol-gel preparation, self-spreading burning and reduction sintering. The preparation method is characterized by comprising the following steps of: mixing an aluminum nitrate solution and a copper nitrate solution, adding citric acid as a chelant, regulating pH value of the mixed solution to be less than seven to obtain sol, placing the sol in the environment with the temperature of 90 DEG C to 120 DEG C for more than 10 hours to form gel, heating the gel to 300 DEG C to 500 DEG C to carry out self-spreading burning, grinding to obtain black nano-alumina and copper oxide powder, sintering the black powder for more than 8h at 300-400 DEG C under a reducing atmosphere to obtain nano-alumina and copper composite powder, molding the composite powder by compression, and sintering in the reducing atmosphere of 800 DEG C to 900 DEG C for one to three hours to obtain the composite with the volume percentage content of Al2O3 is 0.1% to 3%. The composite can be widely used in the fields of machinery, electron, space flight and aviation, and the like.

Description

1. Technical field [0001] The invention relates to a method for preparing a copper-based composite material, in particular to a method for preparing a copper-based composite material reinforced by dispersion distribution of nano-alumina particles by using a sol-gel self-propagating combustion method. 2. Background technology [0002] Copper and copper alloys are widely used in important industrial sectors such as electric power, electrical engineering, and machinery manufacturing because of their good electrical conductivity, thermal conductivity, corrosion resistance, excellent process performance, and high strength. However, with the development of science and technology and modern industry, higher requirements are put forward for the performance of copper and copper alloys. Therefore, people are constantly exploring functional materials with excellent comprehensive physical and mechanical properties - high-strength and high-conductivity copper alloys to meet the new requi...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C9/00
Inventor 张学斌凤仪丁云飞邵浩刘莎莎许杰
Owner HEFEI UNIV OF TECH
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