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Reinforced magnesium-based composite material and preparation method thereof

A composite material and magnesium alloy technology, applied in the field of reinforced magnesium-based composite materials and their preparation, can solve the problems of low content of nano-silicon carbide particles, low infiltration rate, affecting the infiltration of molten metal liquid, etc., and achieve enhanced tensile strength. , the effect of increasing the infiltration rate and increasing the porosity

Active Publication Date: 2020-09-18
NANYANG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For example, Wang Chaohui disclosed in "Special Casting and Nonferrous Alloys" the research on the structure and performance of AM60 magnesium alloy enhanced by nano-SiC particles, and specifically disclosed that nano-silicon carbide particles were added to the molten AM60 magnesium alloy under the protection of inert gas. The magnesium-based composite material is obtained by stirring and pouring, and its mechanical properties are improved, but the content of nano-silicon carbide particles is low, which limits the application of the magnesium-based composite material and has certain limitations.
[0006] In addition, in the preparation process of the existing ceramic magnesium-based composite materials, the wettability of the ceramic preform and the magnesium alloy is not very good, which will also affect the infiltration of the molten metal liquid on the ceramic preform, resulting in a low infiltration rate. , will also affect the mechanical properties of magnesium matrix composites

Method used

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  • Reinforced magnesium-based composite material and preparation method thereof

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Embodiment 1

[0032] A method for preparing a reinforced magnesium-based composite material, comprising the following steps:

[0033] S1. Preparation of modified silicon carbide powder

[0034] Add silicon carbide to hydrofluoric acid and soak for 24 hours, then take out silicon carbide, wash with water until the pH value is 6.5-7.0, that is, neutral, dry, vacuum ball mill, and sieve through a 625-mesh sieve to obtain modified silicon carbide Powder: Porous silicon carbide powder is obtained by hydrofluoric acid modification, and the particle size of the powder is less than 20 μm.

[0035] S2, prepare the AIP isopropanol solution of 60wt%

[0036] Add aluminum isopropoxide (AIP) into the isopropanol solution, and mix evenly with ultrasonic vibration to obtain the product;

[0037] S3. Under the condition of ultrasonic stirring, add modified silicon carbide powder to 60wt% AIP isopropanol solution, wherein the mass ratio of AIP to modified silicon carbide powder is 1:0.6; react at 85°C for...

Embodiment 2

[0046] A method for preparing a reinforced magnesium-based composite material, comprising the following steps:

[0047]S1. Preparation of modified silicon carbide powder

[0048] Add silicon carbide to hydrofluoric acid and soak for 36 hours, then take out silicon carbide, wash with water until the pH value is 6.5-7.0, dry, vacuum ball mill, and sieve through a 625-mesh sieve to obtain modified silicon carbide powder; Hydrofluoric acid modification obtains porous silicon carbide powder, and the particle size of the powder is less than 20 μm.

[0049] S2, prepare the AIP isopropanol solution of 70wt%

[0050] Add aluminum isopropoxide (AIP) into the isopropanol solution, and mix evenly with ultrasonic vibration to obtain the product;

[0051] S3. Under the condition of ultrasonic stirring, add modified silicon carbide powder to 70wt% AIP isopropanol solution, wherein the mass ratio of AIP to modified silicon carbide powder is 1:0.5; react at 100°C for 3.5 h;

[0052] After ...

Embodiment 3

[0061] A method for preparing a reinforced magnesium-based composite material, comprising the following steps:

[0062] S1. Preparation of modified silicon carbide powder

[0063] Add silicon carbide to hydrofluoric acid and soak for 12 hours, then take out silicon carbide, wash with water until the pH value is 6.5-7.0, dry, vacuum ball mill, and sieve through a 625-mesh sieve to obtain modified silicon carbide powder; Hydrofluoric acid modification obtains porous silicon carbide powder, and the particle size of the powder is less than 20 μm.

[0064] S2, prepare the AIP isopropanol solution of 50wt%

[0065] Add aluminum isopropoxide (AIP) into the isopropanol solution, and mix evenly with ultrasonic vibration to obtain the product;

[0066] S3. Under the condition of ultrasonic stirring, add modified silicon carbide powder to 50wt% AIP isopropanol solution, wherein the mass ratio of AIP to modified silicon carbide powder is 1:0.8; react at 70°C for 8h ;

[0067] After th...

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Abstract

The invention provides a reinforced magnesium-based composite material and a preparation method thereof. The preparation method of the reinforced magnesium-based composite material comprises the following steps that S1, under an ultrasonic stirring condition, adding modified silicon carbide powder into an AIP isopropanol solution, reacting at 70 DEG C to 100 DEG C for 3 to 8 hours; adding an acetic acid peptizer after hydrolysis, cooling to normal temperature to obtain slurry; S2, adding a binder into the slurry, transferring the slurry into a mold for casting molding, carrying out vacuum degassing, freeze drying and cold pressing to obtain a porous ceramic prefabricated part; S3, placing a magnesium alloy ingot on the porous ceramic prefabricated part, placing the magnesium alloy ingot and the porous ceramic prefabricated part in the mold; and S4, transferring the mold into a vacuum resistance furnace, heating to 500 DEG C to 600 DEG C at a speed of 3 DEG C / min in a protective atmosphere, preserving heat; then heating to 800 DEG C to 900 DEG C at the speed of 5 DEG C / min, preserving heat, after melting the magnesium alloy ingot, infiltrating the porous ceramic prefabricated part and wrapping the outer surface of the porous ceramic prefabricated part with the molten magnesium alloy ingot. By means of the reparation method of the reinforced magnesium-based composite material, the infiltration rate of the molten metal to the ceramic prefabricated part is increased.

Description

technical field [0001] The invention belongs to the technical field of preparation of light metal-based composite materials, and in particular relates to a reinforced magnesium-based composite material and a preparation method thereof. Background technique [0002] The fastest-growing light metal matrix composites are aluminum matrix composites, but because magnesium has a lower density than aluminum and has higher specific strength and specific stiffness, magnesium matrix composites have become the second choice after aluminum matrix composites. More competitive light metal matrix composites. [0003] Magnesium-based composites are mainly based on magnesium compounds, cast magnesium or magnesium alloys, and carbides (such as SiC, B 4 C, etc.), borides (such as TiB 2 etc.), oxide particles (such as MgO, Al 2 o 3 etc.), intermetallic compounds, graphene oxide, carbon (graphite) fibers, helical carbon nanotubes, etc. are composite materials formed by the combination of rei...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C23/00C22C32/00
CPCC22C1/1015C22C1/1036C22C23/00C22C32/0063C22C1/1021C22C1/1073
Inventor 张聪正梁晨
Owner NANYANG NORMAL UNIV
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