Preparation method of in-situ synthetic dual-phase particle reinforced aluminum-based composite material

A technology for particle-reinforced aluminum and composite materials, which is used in the field of in-situ synthesis of dual-phase particle-reinforced aluminum-based composite materials, and can solve the problems of easy particle agglomeration, uneven particle distribution, and harsh reaction conditions.

Active Publication Date: 2020-07-07
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing an in-situ synthesized dual-phase particle-reinforced aluminum-based composite material in view of the shortcomings of existing in-situ synthesized particles such as easy agglomeration of particles, harsh reaction conditions, and uneven particle distribution, that is, aluminum / Aluminum alloy powder, boron particles and carbon powder prepared by ball milling and cold pressing are embedded in the lower part of the stirring rod, and penetrate into the interior of the aluminum / aluminum alloy melt to stir and rotate. The preform melts and falls off layer by layer in the melt. Under the action of centrifugal force and forced convection, boron and carbon are evenly distributed inside the melt, and at the same time, under the synergistic effect of cavitation, acoustic flow and convection caused by ultrasound and stirring, efficient in-situ reaction synthesizes dispersed Al 3 BC and AlB 2 Duplex Particle Reinforced Aluminum Matrix Composites

Method used

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  • Preparation method of in-situ synthetic dual-phase particle reinforced aluminum-based composite material
  • Preparation method of in-situ synthetic dual-phase particle reinforced aluminum-based composite material
  • Preparation method of in-situ synthetic dual-phase particle reinforced aluminum-based composite material

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preparation example Construction

[0036] Such as figure 1 As shown, the present invention is a preparation method of in-situ synthesis of dual-phase particle-reinforced aluminum-based composite materials, which specifically includes the following steps:

[0037] S1) using aluminum / aluminum alloy powder, graphite powder and boron particles as raw materials to make a prefabricated body;

[0038] S2) Embed the preform obtained in S1) into the lower part of the stirring rod, and penetrate deep into the aluminum / aluminum alloy melt, and synthesize dispersed Al through in-situ reaction 3 BC and AlB 2 The dual-phase particle-reinforced aluminum-matrix composite material melt of the particles is cooled to obtain the dual-phase particle-reinforced aluminum-matrix composite material.

[0039] The preparation method also includes S3) a casting process, and S2) is obtained from dispersedly distributed Al 3 BC and AlB 2 Particle-based dual-phase particle-reinforced aluminum-matrix composite melts are cast into shape. ...

Embodiment 1

[0053] Embodiment 1: Using the present invention to prepare Al in situ in Al-Si-Fe alloy melt 3 BC and AlB 2 To enhance particles, the steps are as follows:

[0054] (1-1) Weigh 120g of Al-8Si-Fe alloy powder with a particle size of <20μm and a particle size of 0.5-3

[0055] 1. Crucible; 2. Aluminum / aluminum alloy melt; 3. Preform; 4. Stirring rod; 5. Ultrasonic device; 6. Thermocouple; 7. Heating device; 8. AlB 2 Particles; 9, Al 3 BC particles.

[0056] 14g of graphite powder of μm and 20g of boron particles with a particle size of 0.5-2μm;

[0057] (1-2) Mix the aluminum / aluminum alloy powder and the graphite powder and then ball mill it for 20 hours, then mix it with the boron particles and continue the ball milling for 8 hours, then cold press and form it into a prefabricated body for later use;

[0058] (1-3) Melting 1 kg of Al-8Si-Fe aluminum alloy and placing it in the crucible 1, heating the heating device 8 after refining, degassing, and removing slag, and cont...

Embodiment 2

[0062] Embodiment 2: Using the present invention to prepare Al in situ in aluminum melt 3 BC and AlB 2 To enhance particles, the steps are as follows:

[0063] (1-1) Weigh 150 g of Al powder with a particle size of <30 μm, 18 g of graphite powder with a particle size of 0.5-3 μm, and 30 g of boron particles with a particle size of 0.5-2 μm;

[0064] (1-2) Mix the aluminum / aluminum alloy powder and the graphite powder and then ball mill it for 16 hours, then mix it with the boron particles and continue the ball milling for 7 hours, then cold press and form it into a prefabricated body for later use;

[0065] (1-3) Melting 1.8kg of aluminum, after refining, degassing, and slag removal, set the melt temperature to 720°C for heat preservation;

[0066] (1-4) Insert the prefabricated body into the lower part of the stirring rod, and stir and rotate it deep into the aluminum / aluminum alloy melt. The prefabricated body melts and falls off layer by layer in the melt, and the boron a...

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Abstract

The invention belongs to the technical field of preparation of aluminum-based composite materials, and relates to a preparation method of an in-situ synthetic dual-phase particle reinforced aluminum-based composite material. The method specifically comprises the following specific steps that firstly, aluminum / aluminum alloy powder and graphite powder are uniformly mixed and ball-milled, and then amixture is uniformly mixed with boron particles and ball-milled to prepare a preform; and the preform is embedded into the lower portion of a stirring rod, the stirring rod penetrates deeply into analuminum / aluminum alloy melt for stirring and rotation, carbon and boron are uniformly distributed inside the melt under the action of centrifugal force and forced convection, an in-situ reaction process is accelerated under the synergistic action of cavitation, sound flow and convection caused by ultrasonic and stirring, and a dispersed and distributed Al3BC and AlB2 biphasic particle reinforcedaluminum-based composite material is synthesized in situ. The preparation method has the beneficial effects that the process is simple and convenient, the in-situ synthesized particles are not prone to agglomerate, the reaction conditions are simple, the Al3BC-AlB2 particles of nanometer-micrometer mixed size can synchronously improve the mechanics and thermal conductivity properties of aluminum / aluminum alloy, and in addition, the method is suitable for casting and near-net forming of large complex composite material products.

Description

technical field [0001] The invention belongs to the technical field of aluminum-based composite material preparation, and in particular relates to a method for preparing an in-situ synthesized dual-phase particle-reinforced aluminum-based composite material. Background technique [0002] Aluminum and aluminum alloys are currently widely used lightweight metal structural materials. Particle-reinforced aluminum matrix composites have been widely concerned and researched due to their advantages such as high specific strength, high elastic modulus, high hardness and good wear resistance. When the content of reinforcing particles is constant, the more uniform the particle distribution, the finer the particle size, and the better the strengthening effect. [0003] At present, since the particle size of in-situ synthesized particles can generally be controlled in micron or submicron size, and the interface between the reinforcement phase particles and the matrix is ​​well bonded, ...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C21/00C22C32/00
CPCC22C1/1015C22C1/1036C22C21/00C22C32/0047C22C1/1052
Inventor 祁明凡李静媛康永林徐玉昭乌拉别克·朱玛别克陈雨来
Owner UNIV OF SCI & TECH BEIJING
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