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Preparation method of aluminum-based composite material reinforced by particles through uniform dispersion

An aluminum-based composite material and uniform dispersion technology, which is applied in the field of aluminum-based composite materials, can solve problems such as difficult control of particle size and distribution, achieve the effects of avoiding local defects, solving uneven dispersion and particle aggregation, and enhancing matrix strength

Inactive Publication Date: 2018-02-23
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the quality of the composite material prepared by the in-situ reaction method depends largely on the reaction process and the uniformity of the reaction in the molten pool, and it is difficult to control the size and distribution of the added particles.

Method used

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  • Preparation method of aluminum-based composite material reinforced by particles through uniform dispersion
  • Preparation method of aluminum-based composite material reinforced by particles through uniform dispersion
  • Preparation method of aluminum-based composite material reinforced by particles through uniform dispersion

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing an aluminum matrix composite material reinforced by uniform dispersion of particles, the specific steps are as follows:

[0021] 1) adding the metal Al-Si alloy into the graphite crucible 2, and performing electromagnetic induction heating through the electromagnetic field generating device 1 so that the alloy is in a molten state;

[0022] 2) Keep the molten alloy 5 at 780° C. by controlling the intensity of the electromagnetic field, and keep the temperature for 5 minutes;

[0023] 3) Preheat SiC particles with 4.5% volume of the molten alloy 5 to 300° C., and slowly add them into the molten alloy 5, and mix the SiC particles with the molten alloy 5 under the stirring of the mechanical stirrer 3 and the electromagnetic field generator 1;

[0024] 4) By controlling the strength of the electromagnetic field, the temperature of the alloy is kept in the eutectic region of the Al-Si alloy, and it is fully stirred for 5 minutes, so that the precipitat...

Embodiment 2

[0026] A method for preparing an aluminum matrix composite material reinforced by uniform dispersion of particles, the specific steps are as follows:

[0027] 1) adding the metal Al-Si alloy into the graphite crucible 2, and performing electromagnetic induction heating through the electromagnetic field generating device 1 so that the alloy is in a molten state;

[0028] 2) Keep the molten alloy 5 at 800° C. by controlling the intensity of the electromagnetic field, and keep the temperature for 5 minutes;

[0029] 3) Preheat the SiC particles with 5% volume of the molten alloy 5 to 300°C, and slowly add them into the molten alloy 5, and mix the SiC particles with the molten alloy 5 under the stirring of the mechanical stirrer 3 and the electromagnetic field generator 1;

[0030] 4) By controlling the strength of the electromagnetic field, the temperature of the alloy is kept in the eutectic region of the Al-Si alloy, and it is fully stirred for 8 minutes, so that the precipitat...

Embodiment 3

[0032] A method for preparing an aluminum matrix composite material reinforced by uniform dispersion of particles, the specific steps are as follows:

[0033] 1) adding the metal Al-Si alloy into the graphite crucible 2, and performing electromagnetic induction heating through the electromagnetic field generating device 1 so that the alloy is in a molten state;

[0034] 2) Keep the molten alloy 5 at 820° C. by controlling the intensity of the electromagnetic field, and keep the temperature for 5 minutes;

[0035] 3) Preheat the SiC particles with 5.5% volume of the molten alloy 5 to 300°C, and slowly add them into the molten alloy 5, and mix the SiC particles with the molten alloy 5 under the stirring of the mechanical stirrer 3 and the electromagnetic field generator 1;

[0036] 4) By controlling the strength of the electromagnetic field, the temperature of the alloy is kept in the eutectic region of the Al-Si alloy, fully stirred for 10 minutes, so that the precipitated Si c...

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Abstract

The invention discloses a preparation method of an aluminum-based composite material reinforced by particles through uniform dispersion. The preparation method includes the following specific steps that a metal Al-Si alloy is added in a graphite crucible, and the alloy is made to be in the molten state by conducting electromagnetic inducting heating through electromagnetic field generation devices; and the reinforcing particles accounting for 4.5%-5.5% of the volume of the molten alloy are taken, preheated to 300 DEG C and slowly added in the molten alloy, the reinforcing particles and the molten alloy are mixed under cooperative stirring of a mechanical stirrer and the electromagnetic field generation devices, the temperature of the alloy is kept within the eutectic area of the Al-Si alloy by controlling the intensity of electromagnetic fields, part of Si crystal particles are separated out, Si crystals which are separated out are sufficiently mixed with the reinforcing particles under the synergistic effect of mechanical and electromagnetic stirring, reinforcing particle clusters are broken, and therefore the reinforcing particles can be evenly dispersed in an alloy substrate. Bymeans of the preparation method, the problem that because mechanical stirring is independently used, dead zones in a melt are caused is solved, and meanwhile the phenomenon that because electromagnetic stirring is independently used, the reinforcing particles are gathered on the surface of the alloy substrate is also avoided.

Description

technical field [0001] The invention relates to the technical field of aluminum-based composite materials, in particular to a method for preparing aluminum-based composite materials reinforced by uniform dispersion of particles. Background technique [0002] Aluminum matrix composites have excellent properties such as light weight, high strength, and good wear resistance, and are widely used in aerospace, national defense, transportation and other fields. Through the strengthening of dispersed particles, the performance of aluminum matrix composites can be greatly improved. [0003] At present, the preparation methods of aluminum matrix composites mainly include the method of adding reinforced particles and the method of in-situ reaction generation. The method of adding reinforced particles is to mix the added particles with metal powder and perform hot press molding (Chinese patent: CN1510153, publication date 2004.07.07, name of invention: high-strength and high-plastic p...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C1/10C22C21/00C22C32/00
CPCC22C1/1036C22C21/00C22C32/0052
Inventor 李涛吕学伟严建川党杰游志雄余文轴
Owner CHONGQING UNIV
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