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Preparation method and device of in situ aluminum matrix composite

An aluminum-based composite material, in-situ technology, applied in the field of aluminum-based composite materials, can solve problems such as uneven distribution of composite particles, limited effective depth of melt, and difficulty in meeting production requirements.

Active Publication Date: 2016-11-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the effect of single application of mechanical stirring or electromagnetic stirring on the in situ reaction synthesis of particle-reinforced aluminum matrix composites is still unsatisfactory.
In the process of single application of mechanical stirring, there are often "dead angles" or uneven distribution of composite particles caused by uneven mechanical force, resulting in low comprehensive performance of composite materials
When a single magnetic field is applied, due to the insurmountable skin effect of the electromagnetic field in the metal melt, the strength of the magnetic field in the metal decays exponentially, so the effective depth of the magnetic field on the melt is limited, especially for large-volume molten pools Or when a high-frequency electromagnetic field is used, the difference in the electromagnetic effect in the melt is very obvious, that is, the electromagnetic field in the melt has serious inhomogeneity, the electromagnetic field in the central area is weak and the electromagnetic field in the edge area is strong, so it is difficult to achieve production. need

Method used

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  • Preparation method and device of in situ aluminum matrix composite
  • Preparation method and device of in situ aluminum matrix composite
  • Preparation method and device of in situ aluminum matrix composite

Examples

Experimental program
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Effect test

Embodiment 1

[0024] with K 2 ZrF 6 、KBF 4 As the reactant, the mixed and ground reactant powder was dried at 200°C for 2 hours for later use; the A356 aluminum alloy was placed in a graphite crucible and heated and melted with an induction coil. When the temperature reached 850°C, the dried mass was A356 The reactant powder with 20% aluminum alloy mass is pressed into the aluminum alloy melt with a bell jar; the graphite rotor is placed at the reaction interface between the aluminum alloy melt and the reactant, and the electromagnetic stirring device (frequency 10Hz) and the graphite rotor stirring device are turned on (rotating speed 150r / min), after reacting for 30min, drop the graphite rotor to the place 40mm away from the bottom of the crucible, increase the frequency of electromagnetic stirring (frequency 20Hz) and graphite rotor rotating speed (rotating speed 300r / min), after stirring for 20min, stand still, remove Gas, slag removal, when the temperature drops to 720 ° C, casting m...

Embodiment 2

[0027] Take Na 2 B 4 o 7 、K 2 ZrF 6As the reactant, the mixed and ground reactant powder was dried at 300°C for 3 hours and set aside; the A357 aluminum alloy was placed in a graphite crucible and heated and melted by an induction coil. When the temperature reached 850°C, the dried mass was The reactant powder with 10% mass of A357 aluminum alloy is pressed into the aluminum alloy melt with a bell jar; the graphite rotor is placed at the reaction interface between the aluminum alloy melt and the reactant, and the electromagnetic stirring device (frequency 2Hz) is turned on to stir with the graphite rotor device (rotating speed 50r / min), after reacting for 30min, place the graphite rotor at a distance of 40mm from the bottom of the crucible, increase the frequency of electromagnetic stirring (frequency 10Hz) and the rotating speed of the graphite rotor (rotating speed 150r / min), after stirring for 20min, let stand, After degassing and slag removal, when the temperature drop...

Embodiment 3

[0030] with K 2 ZrF 6 and KBF 4 For the reactant, according to generate 3wt.% nanometer ZrB 2 The particles are chemically proportioned, and the mixed and ground reactant powder is dried at 200°C for 3 hours for later use; the 6063 aluminum alloy is placed in a graphite crucible and heated and melted by an induction coil. When the temperature reaches 850°C, the dried The reactant powder whose mass is 20% of the 6063Al alloy mass is pressed into the aluminum alloy melt with a bell jar. Place the graphite rotor at the reaction interface between the aluminum alloy melt and the reactant, turn on the electromagnetic stirring device (frequency 6Hz) and the graphite rotor stirring device (rotational speed 100r / min), and after reacting for 30min, place the graphite rotor at a distance of 40mm from the bottom of the crucible At the place, increase the electromagnetic stirring frequency (frequency 15Hz) and the graphite rotor speed (rotation speed 250r / min), stir for 20 minutes, let ...

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Abstract

The invention relates to an aluminum matrix composite, in particular to a preparation method and device of an in situ aluminum matrix composite. The preparation method of the in situ aluminum matrix composite is characterized by comprising the steps that firstly, under the protection of gas, reactants are involved into melt layer by layer for a full contact reaction by means of electromagnetic stirring and interface reverse shear stirring formed by a graphite rotor; then the graphite rotor is placed into the reacting melt for continuous reverse stirring; and finally, casting molding is conducted at a normal casting temperature. The preparation method has the characteristics that composite reinforcement bodies are high in reacting generation efficiency and even in distribution; and the composite is stable in performance; the preparation method is easy to achieve; and industrial application is facilitated.

Description

technical field [0001] The invention relates to an aluminum-based composite material, in particular to a method for preparing an in-situ aluminum-based composite material and a device thereof. Background technique [0002] The in-situ synthesis process is a new technology for the preparation of aluminum-based composites developed in recent years. It uses molten aluminum alloys and highly reactive non-metal gas phases or solid phases to undergo chemical reactions at high temperatures to form finely dispersed ceramics. The reinforcement phase is used to achieve the purpose of reinforcing the matrix material. Due to the advantages of simple synthesis process and clean matrix particle interface, it has attracted a lot of attention. However, in the preparation process of in-situ composite materials, there are problems of incomplete reaction and difficult dispersion of particles, which lead to agglomeration of reinforcing particles, and it is difficult to give full play to the rei...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/10C22C32/00
CPCC22C1/1036C22C21/00C22C32/00C22C1/1052
Inventor 赵玉涛王研怯喜周钱炜王晓璐
Owner JIANGSU UNIV
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