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Preparation method of in-situ synthesized Mg2Si particle enhanced aluminum matrix composite

A particle-reinforced aluminum, in-situ self-generated technology, applied in the field of non-ferrous metal materials, can solve the problems of inability to significantly inhibit the growth tendency, high cost of rapid solidification technology, and insignificant deterioration effect, etc., to achieve fine particles, rounded shape, and optimized shape Effect

Inactive Publication Date: 2015-04-08
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Rapid solidification technology can refine Mg 2 Si reinforcement partly solves the above problems, but rapid solidification technology has high cost and complicated process, so it is difficult to popularize and apply
Currently, improving autogenous Mg 2 The method of Si composite materials is mainly modification treatment, such as compound salt (NaCl+NaF+KCl), phosphorus refiner (NaCl+NaF+P) and Ti+P modification agent, etc., but none of the above modification agents can significantly inhibit Mg 2 Dendrite growth tendency of Si reinforcement, no significant effect on modification

Method used

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  • Preparation method of in-situ synthesized Mg2Si particle enhanced aluminum matrix composite
  • Preparation method of in-situ synthesized Mg2Si particle enhanced aluminum matrix composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, the resistance furnace is heated up, and the graphite crucible is put into the resistance furnace to preheat.

[0024] Al-Si, Al-Mg master alloy and pure aluminum are used as raw materials and put into the crucible according to a certain ratio. The rest is Al; heat the charge in the crucible to 730-770°C to completely melt the charge and keep it warm for a period of time. As a preference, keep the charge for 15-30 minutes after the charge is completely melted; protect the melt with an inert gas during the melting process.

[0025] Add a refining agent into the crucible for refining, and after refining, keep it static at 730-770°C for 3-5 minutes to remove the slag on the surface of the melt; preferably, the refining agent is C 2 Cl 6 , and its addition amount is 0.2-0.3% of the total mass of charge.

[0026] Electrodes are used to conduct electric pulse treatment on the melt. The electric pulse treatment process is as follows: first, preheat the electrode conne...

Embodiment 2

[0028] First, the resistance furnace is heated up, and the graphite crucible is put into the resistance furnace to preheat.

[0029] Al-Si, Al-Mg master alloy and pure aluminum are used as raw materials and put into the crucible according to a certain proportion. %, AL85%; that is, Mg is 72g, Si is 48g, and the rest are all AL. Heat the charge in the crucible to 730°C to completely melt the charge and keep it warm for 15 minutes; protect the melt with an inert gas during the melting process.

[0030] Add a refining agent to the crucible for refining, and after refining, keep it at 730°C for 3 minutes to remove the slag on the surface of the melt; the refining agent is C 2 Cl 6 , and its addition is 0.2% of the total mass of charge, i.e. 1.6g.

[0031] Electrodes are used to conduct electric pulse treatment on the melt, and the electric pulse treatment process is as follows: firstly, the electrode connected to the pulse generator is preheated for 2 minutes, then vertically i...

Embodiment 3

[0033] First, the resistance furnace is heated up, and the graphite crucible is put into the resistance furnace to preheat.

[0034] Al-Si, Al-Mg master alloy and pure aluminum are used as raw materials and put into the crucible according to a certain proportion. %, AL85%; that is, Mg is 200g, Si is 100g, and the rest are all AL. Heat the charge in the crucible to 750°C to completely melt the charge and keep it warm for 20 minutes; protect the melt with an inert gas during the melting process.

[0035] Add a refining agent to the crucible for refining, and after refining, keep it at 750°C for 5 minutes to remove the slag on the surface of the melt; the refining agent is C 2 Cl 6 , and its addition is 0.3% of the total mass of charge, i.e. 6g.

[0036] Electrodes are used to conduct electric pulse treatment on the melt. The electric pulse treatment process is as follows: firstly, preheat the electrode connected to the pulse generator for 5 minutes, then insert it vertically ...

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Abstract

The invention discloses a preparation method of an in-situ synthesized Mg2Si particle enhanced aluminum matrix composite. The preparation method comprises the following steps: heating an electric resistance furnace to increase the temperature and putting a graphite crucible into the electric resistance furnace for preheating; blending Al-Si and Al-Mg intermediate alloys and pure aluminum together in a certain ratio and putting the mixture into the crucible, wherein the mixture includes 9-10% of Mg, 5-6% of Si and the balance of Al in percentage by weight; heating the furnace charge in the crucible to the range of 730-770 DEG C; protecting the melt by use of an inert gas in the smelting process; adding a refining agent for refining and preserving heat in a static state for 3-5 minutes after refining; and performing electric pulse treatment on the melt, preserving heat for 5-10 minutes after the treatment and casting to obtain the finished product. The preparation method of the in-situ synthesized Mg2Si particle enhanced aluminum matrix composite has the beneficial effects that the preparation process is simple to operate, no any modificator is added and the alloy components are simple. The electric pulse treatment is adopted and the cost is low. The sizes of the obtained in-situ synthesized Mg2Si particles range from 10 to 30 microns, the particles are fine and are distributed evenly; besides, the particles are round, so that the bonding strength of the Mg2Si particles to a substrate is higher; in short, the preparation method is more accordant with the preparation principle of the composites.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal materials, in particular to an in-situ self-generated Mg 2 The preparation method of Si particle reinforced aluminum matrix composite material. Background technique [0002] Mg 2 Si particle in-situ reinforced aluminum matrix composites have excellent characteristics such as high specific strength, good wear resistance, heat resistance and low thermal expansion rate, making them the candidate materials for the fields of automobile, aviation and electronics. However, the Mg formed as the primary phase in this type of aluminum alloy 2 The Si reinforcement is generally relatively thick, and most of them are sharp-edged, which splits the matrix and seriously reduces the mechanical properties of the material. Therefore, improving the shape, size and distribution of reinforcements, controlling the solidification, processing and forming process of composite materials, and improving their strength and ...

Claims

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Application Information

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IPC IPC(8): C22C21/08C22C1/03
CPCC22C1/03C22C21/08
Inventor 王冰唐立丹王建中齐锦刚王家毅
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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