CN114147214B - Preparation method of carbon nano tube reinforced magnesium-based composite material - Google Patents

Preparation method of carbon nano tube reinforced magnesium-based composite material Download PDF

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CN114147214B
CN114147214B CN202111427965.5A CN202111427965A CN114147214B CN 114147214 B CN114147214 B CN 114147214B CN 202111427965 A CN202111427965 A CN 202111427965A CN 114147214 B CN114147214 B CN 114147214B
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reinforced magnesium
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CN114147214A (en
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王武孝
刘争争
秦少勇
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Xian University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling

Abstract

The invention discloses a preparation method of a carbon nano tube reinforced magnesium-based composite material, which is implemented according to the following steps: step 1, weighing carbon nano tubes and AZ91 magnesium alloy powder according to mass percentage, and ball-milling and mixing in a conical ball mill to obtain mixed powder; step 2, adding a dispersing agent, a homogenizing agent and alcohol into the mixed powder in the step 1, and continuing ball milling to obtain mixed slurry; step 3, filtering the mixed slurry in the step 2 by using a nanofiltration membrane, and then performing vacuum degree of 9 multiplied by 10 ‑3 Vacuum degassing below pa, and casting to form; step 4, placing the cast blank into drying equipment, and drying for 15-30min at 500-550 ℃ through an upper drying channel and a lower drying channel; and 5, cutting the blanks dried in the step 4, and then placing the blanks in a box-type resistance furnace for homogenizing heat treatment to obtain the finished products. The invention solves the problem of serious agglomeration of CNTs in an alloy matrix in the existing preparation method.

Description

Preparation method of carbon nano tube reinforced magnesium-based composite material
Technical Field
The invention belongs to the technical field of preparation methods of carbon nanotube reinforced magnesium-based composite materials, and particularly relates to a preparation method of a carbon nanotube reinforced magnesium-based composite material.
Background
The magnesium alloy has the advantages of good machinability, easy processing, high specific strength, specific stiffness, light weight, low density and the like, and is widely applied to the fields of new energy vehicles, aerospace, electronic communication, medical appliances and the like. In the light weight engineering application, when manufacturing automobile parts or automobile body boards, if magnesium alloy can be used for replacing original high-strength steel or aluminum alloy, the automobile quality is reduced, and great economic benefits can be brought. However, magnesium alloy has the disadvantages of low tensile strength, low hardness, poor wear resistance and the like, and the wide application of the magnesium alloy is limited. The carbon nanotubes are tubular nano-scale graphite crystals. The alloy has good mechanical properties, the tensile strength reaches 50-200GPa, the alloy is 100 times of steel, the density is only 1/6 of that of steel, the elastic modulus is equivalent to that of diamond, and the alloy can reach 1TPa; meanwhile, CNTs have good flexibility, conductivity and heat transfer property. Because of its excellent mechanical and physical properties, it can be used as an ideal reinforcement of metal-base composite material, and is accepted by students at home and abroad.
Research at home and abroad shows that grain refinement and improvement of mechanical properties of magnesium alloy can be realized by adding reinforcing bodies, and reinforcing phase materials of magnesium-based composite materials with more researches mainly comprise SiC particles and whiskers, al2O3 particles, short fibers, tiC particles, graphite fibers and the like. However, magnesium-based composite materials are limited by the hcp structure of the Mg matrix, and have poor plasticity, and particularly when reinforcing bodies with a micrometer or larger scale are adopted, the composite materials often have the defects of micrometer-scale reinforcing phase fracture, interface failure between the composite materials and the matrix, and the like. The plasticity is reduced sharply while the strength is improved, and the inversion phenomenon of the strength and the plasticity is presented. Related studies have shown that if the reinforcement is reduced in size to nano-scale and uniformly dispersed, the strength of the magnesium-based composite material can be improved while maintaining its plasticity. Therefore, the nano reinforcement is a better choice for improving the toughness of the magnesium-based composite material.
At present, the preparation difficulty of the carbon nano tube reinforced magnesium-based composite material is that the agglomeration phenomenon of CNTs in an alloy matrix is serious, the wettability of the carbon nano tube and magnesium alloy is poor, and the agglomeration and entanglement often lead to air inclusion and the defects of air holes and the like; and the carbon nano tube clusters and entanglement transform the one-dimensional reinforcing phase into a similar granular reinforcing phase, so that the advantage of high length-diameter ratio is lost, and the interfacial stress transfer efficiency is greatly reduced, therefore, it is necessary to optimize a good preparation process to improve the toughness of the CNTs/Mg composite material.
Disclosure of Invention
The invention aims to provide a preparation method of a carbon nano tube reinforced magnesium-based composite material, which solves the problem of serious agglomeration of CNTs in an alloy matrix in the existing preparation method.
The technical scheme adopted by the invention is that the preparation method of the carbon nano tube reinforced magnesium-based composite material is implemented according to the following steps:
step 1, weighing carbon nano tubes and AZ91 magnesium alloy powder according to mass percentage, and ball-milling and mixing in a conical ball mill to obtain mixed powder;
step 2, adding a dispersing agent, a homogenizing agent and alcohol into the mixed powder in the step 1, and continuing ball milling to obtain mixed slurry;
step 3, filtering the mixed slurry in the step 2 by using a nanofiltration membrane, and then performing vacuum degree of 9 multiplied by 10 -3 Vacuum degassing below pa, and casting to form;
step 4, placing the cast blank into drying equipment, and drying for 15-30min at 500-550 ℃ through an upper drying channel and a lower drying channel;
and 5, cutting the blanks dried in the step 4, and then placing the blanks in a box-type resistance furnace for homogenizing heat treatment to obtain the finished products.
The invention is also characterized in that:
the carbon nano tube is multi-wall carbon nano tube with purity more than 98%, inner diameter of 5-10nm, length of 10-20um, magnesium powder purity of 99% and particle diameter of 100um.
The rotational speed of the conical ball mill in the step 1 and the step 2 is 300r/min, and the ball milling time is 10h.
The dispersing agent and the leveling agent are mixed and added according to the mass ratio of 2:1, and the dispersing agent and the leveling agent account for 3% of the mass of the mixed powder.
In the step 2, alcohol is used for soaking the grinding balls and the materials, and the volume is not more than 1/2 of that of the ball milling tank.
The diameter of the grinding balls in the ball milling tank is 5mm and 12mm respectively, and the number ratio of the big balls to the small balls is 2:1.
In the step 3, the aperture of the nanofiltration membrane is 1-2nm, the speed of forming the blank is 2mm/s, and the thickness of the blank is 2mm in the casting forming process.
The heat treatment temperature in the step 5 is 200 ℃ and the treatment time is 12 hours.
In the step 5, the dried blank is cut into plates with the thickness of 60mm and 2mm.
The mass ratio of the carbon nano tube in the step 1 to the mixed powder is not more than 10%.
The beneficial effects of the invention are as follows:
1. the invention can effectively obtain the carbon nano tube with better dispersibility and integrity by carrying out dispersion treatment on the carbon nano tube.
2. The invention utilizes the tape casting process method to improve the interfacial bonding property of the carbon nano tube and the magnesium base to a certain extent.
3. The tensile strength and the toughness of the CNTs/AZ91 magnesium-based composite material prepared by the invention are obviously improved.
Drawings
FIG. 1 is a tissue morphology of CNTs before dispersion in a method for preparing a carbon nanotube-reinforced magnesium-based composite material of the present invention;
FIG. 2 shows the tissue morphology of dispersed CNTs in the preparation method of the carbon nanotube reinforced magnesium-based composite material.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The preparation method of the carbon nano tube reinforced magnesium-based composite material is implemented according to the following steps:
step 1, weighing carbon nano tubes and AZ91 magnesium alloy powder according to the mass percentage, ball-milling and mixing in a conical ball mill to obtain mixed powder, wherein the mass ratio of the carbon nano tubes in the step 1 is not more than 10% of the mixed powder.
The purity of the carbon nano tube is more than 98%, the inner diameter is 5-10nm, the length is 10-20um, the purity of the magnesium powder is 99%, and the particle size is 100um;
step 2, adding a dispersing agent, a homogenizing agent and alcohol into the mixed powder in the step 1, and continuing ball milling to obtain mixed slurry;
the dispersing agent comprises the following components: phosphatidylethanolamine, fatty acid polyglycerol and methyl amyl alcohol are mixed according to the weight ratio of 1:1.5:2 mixing and storing for 15 days in dark, wherein a dispersing agent is used for dispersing agglomerated CNTs;
the homogenizing agent comprises the following components: methyl isopropylbenzene, floral hydrocarbon, m-methylpropylene and 2-methylpentane are mixed according to the weight ratio of 1:1.5:1:2 mixing and keeping away from light for 15 days, wherein a homogenizing agent is used for uniformly distributing dispersed CNTs in the magnesium matrix, and the homogenizing agent is used for improving the wettability of the CNTs matrix;
the dispersing agent and the leveling agent are mixed and added according to the mass ratio of 2:1, and the dispersing agent and the leveling agent account for 3% of the mass of the mixed powder;
alcohol is used for immersing the grinding balls and the materials, and the volume of the alcohol is not more than 1/2 of that of the ball milling tank;
the diameter of the stainless steel grinding balls in the ball milling tank is 5mm and 12mm respectively, and the number ratio of the big balls to the small balls is 2:1;
the rotational speed of the conical ball mill in the step 1 and the step 2 is 300r/min, and the ball milling time is 10h;
step 3, filtering the mixed slurry in the step 2 by using a nanofiltration membrane, and then performing vacuum degree of 9 multiplied by 10 -3 Vacuum degassing below pa, and casting to form;
the aperture of the nanofiltration membrane is 1-2nm, the speed of forming the blank is 2mm/s, and the thickness of the blank is 2mm in the casting forming process;
step 4, placing the cast blank into drying equipment, and drying for 15-30min at 500-550 ℃ through an upper drying channel and a lower drying channel;
step 5, cutting the dried blank in the step 4, and then placing the cut blank in a box-type resistance furnace for homogenization heat treatment to obtain the steel wire rope;
the heat treatment temperature is 200 ℃ and the treatment time is 12 hours;
and cutting the dried blank into plates with the thickness of 60mm and 2mm.
Example 1
The preparation method of the carbon nano tube reinforced magnesium-based composite material is implemented according to the following steps:
step 1, preparing a CNTs/AZ91 magnesium-based composite material with the weight percentage of 0.5, weighing 597g of magnesium powder, and ball-milling and mixing 3g of CNTs in a conical ball mill to obtain mixed powder;
the purity of the carbon nano tube is more than 98%, the inner diameter is 5nm, the length is 10um, the purity of the magnesium powder is 99%, and the grain diameter is 100um;
step 2, adding a dispersing agent, a homogenizing agent and alcohol into the mixed powder in the step 1, and continuing ball milling to obtain mixed slurry; the dispersing agent is used for dispersing the agglomerated CNTs, and the homogenizing agent is used for uniformly distributing the dispersed CNTs in the magnesium matrix, so that the wettability of the CNTs matrix is improved;
the dispersant and the leveling agent are mixed and added according to the mass ratio of 2:1, and the mass of the dispersant and the leveling agent is 18g;
alcohol is used for immersing the grinding balls and the materials, and the volume of the alcohol is not more than 1/2 of that of the ball milling tank;
the diameter of the stainless steel grinding balls in the ball milling tank is 5mm and 12mm respectively, and the number ratio of the big balls to the small balls is 2:1;
the rotational speed of the conical ball mill in the step 1 and the step 2 is 300r/min, and the ball milling time is 10h;
step 3, filtering the mixed slurry in the step 2 by using a nanofiltration membrane, and then performing vacuum degree of 9 multiplied by 10 -3 Vacuum degassing below pa, and casting to form;
the aperture of the nanofiltration membrane is 1-2nm, the speed of forming the blank is 2mm/s, and the thickness of the blank is 2mm in the casting forming process;
step 4, placing the cast blank into drying equipment, and drying for 15min at 500 ℃ through an upper drying channel and a lower drying channel;
step 5, cutting the dried blank in the step 4, and then placing the cut blank in a box-type resistance furnace for homogenization heat treatment to obtain the steel wire rope;
the heat treatment temperature is 200 ℃ and the treatment time is 12 hours;
and cutting the dried blank into plates with the thickness of 60mm and 2mm.
Example 2
The preparation method of the carbon nano tube reinforced magnesium-based composite material is implemented according to the following steps:
step 1, preparing a CNTs/AZ91 magnesium-based composite material with the weight percentage of 1.0, weighing 594g of magnesium powder and 6g of CNTs, and ball-milling and mixing in a conical ball mill to obtain mixed powder;
the purity of the carbon nano tube is more than 98%, the inner diameter is 10nm, the length is 20um, the purity of the magnesium powder is 99%, and the grain diameter is 100um;
step 2, adding a dispersing agent, a homogenizing agent and alcohol into the mixed powder in the step 1, and continuing ball milling to obtain mixed slurry; the dispersing agent is used for dispersing the agglomerated CNTs, the homogenizing agent is used for uniformly distributing the dispersed CNTs in the magnesium matrix, and the homogenizing agent is used for improving the wettability of the CNTs matrix;
the dispersant and the leveling agent are mixed and added according to the mass ratio of 2:1, and the mass of the dispersant and the leveling agent is 18g;
alcohol is used for immersing the grinding balls and the materials, and the volume of the alcohol is not more than 1/2 of that of the ball milling tank;
the diameter of the stainless steel grinding balls in the ball milling tank is 5mm and 12mm respectively, and the number ratio of the big balls to the small balls is 2:1;
the rotational speed of the conical ball mill in the step 1 and the step 2 is 300r/min, and the ball milling time is 10h;
step 3, filtering the mixed slurry in the step 2 by using a nanofiltration membrane, and then performing vacuum degree of 9 multiplied by 10 -3 Vacuum degassing below pa, and casting to form;
the aperture of the nanofiltration membrane is 2nm, the speed of forming a blank is 2mm/s, and the thickness of the blank is 2mm in the casting forming process;
step 4, placing the cast blank into drying equipment, and drying for 30min at 550 ℃ through an upper drying channel and a lower drying channel;
step 5, cutting the dried blank in the step 4, and then placing the cut blank in a box-type resistance furnace for homogenization heat treatment to obtain the steel wire rope;
the heat treatment temperature is 200 ℃ and the treatment time is 12 hours;
and cutting the dried blank into plates with the thickness of 60mm and 2mm.
Example 3
The preparation method of the carbon nano tube reinforced magnesium-based composite material is implemented according to the following steps:
step 1, preparing a CNTs/AZ91 magnesium-based composite material with the weight percentage of 1.5, weighing 591g of magnesium powder and 9g of CNTs, and ball-milling and mixing in a conical ball mill to obtain mixed powder;
the purity of the carbon nano tube is more than 98%, the inner diameter is 7nm, the length is 15um, the purity of the magnesium powder is 99%, and the grain diameter is 100um;
step 2, adding a dispersing agent, a homogenizing agent and alcohol into the mixed powder in the step 1, and continuing ball milling to obtain mixed slurry; the dispersing agent is used for dispersing the agglomerated CNTs, the homogenizing agent is used for uniformly distributing the dispersed CNTs in the magnesium matrix, and the homogenizing agent is used for improving the wettability of the CNTs matrix;
the dispersant and the leveling agent are mixed and added according to the mass ratio of 2:1, and the mass of the dispersant and the leveling agent is 18g;
alcohol is used for immersing the grinding balls and the materials, and the volume of the alcohol is not more than 1/2 of that of the ball milling tank;
the diameter of the stainless steel grinding balls in the ball milling tank is 5mm and 12mm respectively, and the number ratio of the big balls to the small balls is 2:1;
the rotational speed of the conical ball mill in the step 1 and the step 2 is 300r/min, and the ball milling time is 10h;
step 3, filtering the mixed slurry in the step 2 by using a nanofiltration membrane, and then performing vacuum degree of 9 multiplied by 10 -3 Vacuum degassing below pa, and casting to form;
the aperture of the nanofiltration membrane is 1.5nm, the speed of forming a blank is 2mm/s, and the thickness of the blank is 2mm in the casting forming process;
step 4, placing the cast blank into drying equipment, and drying for 30min at 520 ℃ through an upper drying channel and a lower drying channel;
step 5, cutting the dried blank in the step 4, and then placing the cut blank in a box-type resistance furnace for homogenization heat treatment to obtain the steel wire rope;
the heat treatment temperature is 200 ℃ and the treatment time is 12 hours;
and cutting the dried blank into plates with the thickness of 60mm and 2mm.
Example 4
The preparation method of the carbon nano tube reinforced magnesium-based composite material is implemented according to the following steps:
step 1, preparing 2.0wt.% CNTs/AZ91 magnesium-based composite material, weighing 498g of magnesium powder, and ball-milling and mixing 12g of CNTs in a conical ball mill to obtain mixed powder;
the purity of the carbon nano tube is more than 98%, the inner diameter is 7nm, the length is 15um, the purity of the magnesium powder is 99%, and the grain diameter is 100um;
step 2, adding a dispersing agent, a homogenizing agent and alcohol into the mixed powder in the step 1, and continuing ball milling to obtain mixed slurry; the dispersing agent is used for dispersing the agglomerated CNTs, the homogenizing agent is used for uniformly distributing the dispersed CNTs in the magnesium matrix, and the homogenizing agent is used for improving the wettability of the CNTs matrix;
the dispersant and the leveling agent are mixed and added according to the mass ratio of 2:1, and the mass of the dispersant and the leveling agent is 18g;
alcohol is used for immersing the grinding balls and the materials, and the volume of the alcohol is not more than 1/2 of that of the ball milling tank;
the diameter of the stainless steel grinding balls in the ball milling tank is 5mm and 12mm respectively, and the number ratio of the big balls to the small balls is 2:1;
the rotational speed of the conical ball mill in the step 1 and the step 2 is 300r/min, and the ball milling time is 10h;
step 3, filtering the mixed slurry in the step 2 by using a nanofiltration membrane, and then performing vacuum degree of 9 multiplied by 10 -3 Vacuum degassing below pa, and casting to form;
the aperture of the nanofiltration membrane is 1.5nm, the speed of forming a blank is 2mm/s, and the thickness of the blank is 2mm in the casting forming process;
step 4, placing the cast blank into drying equipment, and drying for 30min at 520 ℃ through an upper drying channel and a lower drying channel;
step 5, cutting the dried blank in the step 4, and then placing the cut blank in a box-type resistance furnace for homogenization heat treatment to obtain the steel wire rope;
the heat treatment temperature is 200 ℃ and the treatment time is 12 hours;
and cutting the dried blank into plates with the thickness of 60mm and 2mm.
Example 5
The preparation method of the carbon nano tube reinforced magnesium-based composite material is implemented according to the following steps:
step 1, weighing magnesium powder with purity of 99% and particle size of 100 mu m, and ball-milling in a conical ball mill;
step 2, adding a dispersing agent, a homogenizing agent and alcohol in the step 1, and continuing ball milling to obtain mixed slurry;
the dispersant and the leveling agent are mixed and added according to the mass ratio of 2:1, and the mass of the dispersant and the leveling agent is 18g;
alcohol is used for immersing the grinding balls and the materials, and the volume of the alcohol is not more than 1/2 of that of the ball milling tank;
the diameter of the stainless steel grinding balls in the ball milling tank is 5mm and 12mm respectively, and the number ratio of the big balls to the small balls is 2:1;
the rotational speed of the conical ball mill in the step 1 and the step 2 is 300r/min, and the ball milling time is 10h;
step 3, filtering the mixed slurry in the step 2 by using a nanofiltration membrane, and then performing vacuum degree of 9 multiplied by 10 -3 Vacuum degassing below pa, and casting to form;
the aperture of the nanofiltration membrane is 1.5nm, the speed of forming a blank is 2mm/s, and the thickness of the blank is 2mm in the casting forming process;
step 4, placing the cast blank into drying equipment, and drying for 30min at 520 ℃ through an upper drying channel and a lower drying channel;
step 5, cutting the dried blank in the step 4, and then placing the cut blank in a box-type resistance furnace for homogenization heat treatment to obtain the steel wire rope;
the heat treatment temperature is 200 ℃ and the treatment time is 12 hours;
and cutting the dried blank into plates with the thickness of 60mm and 2mm.
Fig. 2 shows the morphology of the dispersed carbon nanotubes observed by SEM at high magnification, and the CNTs can be clearly seen to be long and intertwined, indicating that the CNTs are significantly dispersed after ball milling and chemical dispersion.
Table 1 shows the results of room temperature tensile test of CNTs/AZ91 composite materials having different CNTs content
As is found by comparing examples 5 with examples 1-4, the tensile strength, the area reduction rate and the elongation rate of examples 1-4 are all superior to those of example 5, wherein the mechanical property of example 3 is the most excellent, and the tensile strength reaches 190MPa, which is improved by about 24% compared with example 5.

Claims (9)

1. The preparation method of the carbon nano tube reinforced magnesium-based composite material is characterized by comprising the following steps of:
step 1, weighing carbon nano tubes and AZ91 magnesium alloy powder according to mass percentage, and ball-milling and mixing in a conical ball mill to obtain mixed powder;
step 2, adding a dispersing agent, a homogenizing agent and alcohol into the mixed powder in the step 1, and continuing ball milling to obtain mixed slurry;
step 3, filtering the mixed slurry in the step 2 by using a nanofiltration membrane, and then performing vacuum degree of 9 multiplied by 10 -3 Vacuum degassing below pa, and casting to form;
step 4, placing the cast blank into drying equipment, and drying for 15-30min at 500-550 ℃ through an upper drying channel and a lower drying channel;
step 5, cutting the blanks dried in the step 4, and then placing the blanks in a box-type resistance furnace for homogenizing heat treatment to obtain the finished products;
the dispersing agent comprises the following components: phosphatidylethanolamine, fatty acid polyglycerol and methyl amyl alcohol are mixed according to the weight ratio of 1:1.5:2, mixing and storing for 15 days in a dark place;
the homogenizing agent comprises the following components: methyl isopropylbenzene, floral hydrocarbon, m-methylpropylene and 2-methylpentane are mixed according to the weight ratio of 1:1.5:1:2, mixing and storing for 15 days in a dark place;
the mass ratio of the carbon nano tube in the step 1 is not more than 10% of the mass ratio of the mixed powder.
2. The method for preparing the carbon nanotube reinforced magnesium-based composite material according to claim 1, wherein the carbon nanotubes are multi-walled carbon nanotubes with a purity of more than 98%, an inner diameter of 5-10nm, a length of 10-20um, a magnesium powder purity of 99%, and a particle size of 100um.
3. The method for preparing the carbon nanotube reinforced magnesium-based composite material according to claim 1, wherein the rotational speed of the conical ball mill in the step 1 and the step 2 is 300r/min, and the ball milling time is 10h.
4. The method for preparing the carbon nanotube reinforced magnesium-based composite material according to claim 1, wherein the dispersant and the leveling agent are mixed and added according to a mass ratio of 2:1, and the dispersant and the leveling agent account for 3% of the mass of the mixed powder.
5. The method for preparing a carbon nanotube-reinforced magnesium-based composite material according to claim 1, wherein the alcohol in the step 2 is not more than 1/2 of the volume of the ball mill tank without passing through the grinding balls and the materials.
6. The method for preparing the carbon nanotube reinforced magnesium-based composite material according to claim 1, wherein the diameters of the grinding balls in the ball milling tank are 5mm and 12mm respectively, and the number ratio of the large balls to the small balls is 2:1.
7. The method for preparing the carbon nanotube reinforced magnesium matrix composite according to claim 1, wherein the aperture of the nanofiltration membrane in the step 3 is 1-2nm, the speed of forming the blank in the casting process is 2mm/s, and the thickness of the blank is 2mm.
8. The method of preparing a carbon nanotube-reinforced magnesium-based composite material according to claim 1, wherein the heat treatment temperature in step 5 is 200 ℃ and the treatment time is 12 hours.
9. The method for preparing the carbon nanotube reinforced magnesium-based composite material according to claim 1, wherein the dried blank is cut into sheets of 60mm by 2mm in the step 5.
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