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Preparation method of enhanced magnesium-based composite material of carbon nanotubes

A technology of carbon nanotubes and composite materials, which is applied in the field of preparation of nanocomposites, and can solve the problems of difficulty in uniform dispersion of carbon nanotubes and low tensile strength of magnesium-based composite materials

Inactive Publication Date: 2014-07-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention aims to solve the technical problems that carbon nanotubes are difficult to uniformly disperse in the magnesium alloy matrix and the tensile strength of the reinforced magnesium-based composite material is low, and provides a preparation method of carbon nanotube-reinforced magnesium-based composite materials

Method used

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  • Preparation method of enhanced magnesium-based composite material of carbon nanotubes
  • Preparation method of enhanced magnesium-based composite material of carbon nanotubes
  • Preparation method of enhanced magnesium-based composite material of carbon nanotubes

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specific Embodiment approach 1

[0014] Specific embodiment one: the preparation method of the carbon nanotube reinforced magnesium-based composite material of the present embodiment is carried out according to the following steps:

[0015] 1. According to the volume ratio of carbon nanotubes and Zn powder (0.25~1):1, the carbon nanotubes and Zn powder are rotated at 100~300rpm, and the ball-to-material ratio is (5~10):1. Ball milling for 8-12 hours to obtain carbon nanotube / Zn powder composite powder;

[0016] 2. According to the volume ratio of the composite powder and magnesium powder in step 1 (2.5~3.5): 1, mix the composite powder and magnesium powder in step 1 evenly and put them in the mold. Under the condition of 140~160MPa, press for 4~6min to get the prefabricated block;

[0017] 3. The mass ratio of Zn powder and magnesium powder in the prefabricated block obtained according to step 2 is 6: (90~98), add the prefabricated block into the molten magnesium powder, and keep it warm at a temperature of ...

specific Embodiment approach 2

[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the ball-to-material ratio in Step 1 is (6-7): 1, and other steps and parameters are the same as Embodiment 1.

specific Embodiment approach 3

[0019] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that the pressing in step 2 is carried out at 190°C and a pressure of 150 MPa, and the pressing time is 5 minutes. Other steps and parameters are the same as in the specific embodiment One or two the same.

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Abstract

The invention relates to a preparation method of an enhanced magnesium-based composite material of carbon nanotubes, relates to a preparation method of a nanometer composite material, and mainly solves the technical problems that the carbon nanotubes are difficultly scattered uniformly in a magnesium alloy matrix and the tensile strength of the enhanced magnesium-based composite material is low. The preparation method comprises the following steps of: firstly, carrying out mixing and ball milling on Zn powder and the carbon nanotubes to obtain composite powder; secondly, pressing the composite powder and magnesium powder into precast blocks after uniformly mixing the composite powder and the magnesium powder; and finally, adding the precast blocks into the molten magnesium powder, heating until obtaining metal solution, and transferring the metal solution into a die to be pressed, thus obtaining the enhanced magnesium-based composite material of the carbon nanotubes, wherein the tensile strength of the enhanced magnesium-based composite material is 195-210 MPa, and the elongation rate of the enhanced magnesium-based composite material is 13-15%. According to the preparation method of the enhanced magnesium-based composite material of the carbon nanotubes, the tensile strength is high, the dispersity is good, and the enhanced magnesium-based composite material of the carbon nanotubes can be applied to the fields of aerospace, automobiles and sports equipments.

Description

technical field [0001] The invention relates to a preparation method of nanocomposite materials. Background technique [0002] Carbon nanotubes (carbon nanotubes, CNTs) are seamless nanoscale tubular materials rolled from single-layer or multi-layer graphite sheets. Because of their unique structure, carbon nanotubes have excellent properties, such as heat resistance, corrosion resistance, and Thermal shock, self-lubrication, etc., its Young's modulus is equivalent to that of diamond, about 1TPa, which is about 5 times that of steel. Carbon nanotubes also have good electrical and thermal properties, and the thermal conductivity of a single carbon nanotube in the axial direction can reach 3000Wm -5 k -a , Its thermal expansion rate is very low, and it still has good stability at 700 ° C. Therefore, once it was discovered in 1991, carbon nanotubes have attracted widespread attention and become an ideal reinforcing phase in composite materials. [0003] However, due to the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C23/04C22C47/00C22C49/04C22C49/14
Inventor 王晓军李成栋施海龙胡小石吴昆郑明毅
Owner HARBIN INST OF TECH
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