Preparation method of Mg/SiCp composite material

A composite material and magnesium melt technology, which is applied in the field of preparation of Mg/SiCp composite materials, can solve the problems of easy damage, complex process, gas film, etc., and achieves a simple and feasible preparation method, uniform particle size distribution, and improved uniformity. Effect

Inactive Publication Date: 2012-03-28
厦门火炬特种金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stirring method and die casting method can be regarded as methods with higher production efficiency of magnesium matrix composites, but neither of these two methods can control the uniform distribution of SiCp reinforcements.
Using stirring during solidification to prepare Mg(AZ91) / Si Cp composites has the following main problems: (1) Due to strong stirring, the latent heat of crystallization can be quickly taken away, and the concentration area of ​​solute atoms at the liquid-solid interface is eliminated , which is more conducive to the growth trend in the nucleation / growth competition, which can cause SiCp particles to be concentrated between the dendrites; (2) strong stirring can entrain the gas into the magnesium melt, and it is easy for the particles and the melt to The phenomenon of air film formation at the interface leads to weaker bonding strength between particles and magnesium matrix
However, due to the complexity of the process and equipment, this technology cannot face industrialized mass production.
In addition to the difficulty in controlling the distribution uniformity of SiCp reinforcements in the production of magnesium-based composites by die-casting, there are also problems that SiCp reinforcement particles are easily damaged due to thermal shock under high temperature and high pressure, and the injection speed of magnesium liquid is too high and it is easy to be involved. Gas, and a gas film is easily generated between SiCp particles and magnesium matrix during the subsequent solidification process
Although the powder metallurgy method is used to prepare Mg / SiCp composite materials, it is relatively easy to control the uniformity of SiCp reinforcement particles, but there are problems with the compactness of the structure and the bonding strength between the SiCp reinforcement and the Mg matrix. At the same time, the process is relatively complicated. Not suitable for large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of Mg / SiCp composite material, the method adopts the following steps,

[0017] (1) 1.2L of high-purity magnesium is heated to 720 ° C, into a molten state, and 0.24L of SiCp particles (volume is 20% of the magnesium melt) with a particle size of 15 to 20 μm is added to the high-purity magnesium melt in a molten state;

[0018] (2) in SF 6 and CO 2 Under the protection of the mixed gas, keep warm for 15 minutes and stir to make the SiCp particles evenly distributed in the graphite crucible;

[0019] (3) After stirring evenly, apply a current density J of 0.8×10 in the magnesium melt from left to right 6 A / m 2 current, and apply an external magnetic field with a magnetic induction intensity B of 0.028T from front to back, and the magnetic field action time is 12min;

[0020] (4) The magnesium melt flows into an iron mold with a talcum powder coating inside, solidifies and forms, and obtains a Mg / SiCp composite material.

[0021] Metallographic ob...

Embodiment 2

[0023] A preparation method of Mg / SiCp composite material, the method adopts the following steps,

[0024] (1) 1.2L of high-purity magnesium is heated to 720 ° C, into a molten state, and 0.24 L of SiCp particles (volume is 20% of the magnesium melt) particles with a particle size of 15 to 20 μm are added to the high-purity magnesium melt in the molten state;

[0025] (2) in SF 6 and CO 2 Under the protection of the mixed gas, keep warm for 15 minutes and stir to make the SiCp particles evenly distributed in the graphite crucible;

[0026] (3) After stirring evenly, apply a current density J of 0.8×10 in the magnesium melt from left to right 6 A / m 2 current, and apply an external magnetic field with a magnetic induction intensity B of 0.032T from front to back, and the magnetic field action time is 12min;

[0027] (4) The magnesium melt flows into an iron mold with a talcum powder coating inside, solidifies and forms, and obtains a Mg / SiCp composite material.

[0028] Met...

Embodiment 3

[0030] A preparation method of Mg / SiCp composite material, the method adopts the following steps,

[0031] (1) 1.2L of high-purity magnesium is heated to 740 ° C, into a molten state, and 0.24L of SiCp particles (volume is 20% of the magnesium melt) with a particle size of 15 to 20 μm is added to the high-purity magnesium melt in a molten state;

[0032] (2) in SF 6 and CO 2 Under the protection of the mixed gas, keep warm for 15 minutes and stir to make the SiCp particles evenly distributed in the graphite crucible;

[0033] (3) After stirring evenly, apply a current density J of 1.2×10 in the magnesium melt from left to right 6 A / m 2 current, and apply an external magnetic field with a magnetic induction intensity B of 0.028T from front to back, and the magnetic field action time is 12min;

[0034] (4) The magnesium melt flows into an iron mold with a talcum powder coating inside, solidifies and forms, and obtains a Mg / SiCp composite material.

[0035]Metallographic obs...

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Abstract

The invention discloses a preparation method of a Mg / SiCp composite material, belonging to the technical field of material preparation. The preparation method of the Mg / SiCp composite material comprises the following steps of: heating high-purity magnesium to 720-740 DEG C to be a melting state; adding SiCp particles to a high-purity magnesium melt in the melting state; preserving temperature andstirring under the protection of a mixed gas of SF6 and CO2 so that the SiCp particles are uniformly distributed in a graphite crucible; uniformly stirring, and then applying current in the high-purity magnesium melt from left to right and an external magnetic field from front to back, wherein the high-purity magnesium melt flows in an iron mould internally provided with talcum powder coating in an attaching way and then is coagulated and formed so as to obtain the Mg / SiCp composite material. The method can be used for successfully preparing the Mg / SiCp composite material which has uniform particle size distribution and compact structure and is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a method for preparing a Mg / SiCp composite material. Background technique [0002] Magnesium alloy has the advantages of high specific strength, specific stiffness and recyclability. Its density is about 64% of aluminum and 23% of steel. It is listed as "green engineering material in the 21st century". At present, due to the low strength of magnesium alloys, there is a certain gap from industrial applications, resulting in 80% of primary magnesium being used for non-structural purposes. The development of high-strength and high-toughness magnesium alloys for industrial applications is of great significance to alleviating the worldwide energy crisis and increasingly serious environmental pressure. [0003] At present, magnesium alloy lightweight structural materials have been applied to a certain extent in the fields of automobile manufacturing and digital communicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F3/02B22D1/00B22D27/00
Inventor 邹宏辉马志新王志英郭胜利
Owner 厦门火炬特种金属材料有限公司
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