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Method for reinforcing magnesium matrix composite through carbon nanotubes coated with magnesium oxide

A technology of carbon nanotubes and composite materials, which is applied in the field of preparation of magnesium-based composite materials, can solve the problems of poor wettability of magnesium alloys and low surface activity of carbon nanotubes, and achieve excellent performance, obvious grain refinement effect, and easy operation simple effect

Active Publication Date: 2015-05-13
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there has been no breakthrough in the research on CNTs-reinforced magnesium alloy composites, and the core issues mainly focus on the following three aspects: first, how to adopt appropriate methods to uniformly disperse carbon nanotubes in the matrix, and It is well combined with the matrix; the second is how to solve the problem of low surface activity of carbon nanotubes and poor wettability with magnesium alloys; the third is how to keep carbon nanotubes in a complete structure during high-temperature sintering

Method used

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  • Method for reinforcing magnesium matrix composite through carbon nanotubes coated with magnesium oxide
  • Method for reinforcing magnesium matrix composite through carbon nanotubes coated with magnesium oxide
  • Method for reinforcing magnesium matrix composite through carbon nanotubes coated with magnesium oxide

Examples

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Effect test

Embodiment 1

[0018] First, mix 1g of carbon nanotubes chemically coated with magnesia and 300ml of acetone solution, stir for 30min, and then ultrasonically disperse for 2h to obtain a uniformly dispersed carbon nanotube-acetone mixture; then add 99g of AZ91 magnesium alloy powder with a particle size of 325 mesh into the mixture Ultrasonic and mechanical stirring at the same time for 2 hours to obtain a uniformly dispersed mixed slurry, which was filtered and vacuum-dried, then transferred to a mold, and cold-pressed at room temperature with a pressure of 100MPa; the cold-pressed composite material was protected by argon, Sintering for 2h, the sintering temperature is 600°C; finally, the sintered composite material is hot-extruded at 380°C to obtain the AZ91 / 1.0wt.%MgO-CNTs composite material. The mechanical properties of the AZ91 / 1.0wt.%MgO-CNTs composite were tested. The tensile strength was 220-240MPa, the elongation was 11.2-12.5%, and the hardness was 75.9-80.6HV. It is a composite wi...

Embodiment 2

[0020] First, mix 3g of carbon nanotubes chemically coated with magnesia and 500ml of acetone solution, stir for 30min, and then ultrasonically disperse for 2h to obtain a uniformly dispersed carbon nanotube-acetone mixture; then add 97g of AZ91 magnesium alloy powder with a particle size of 325 mesh into the mixture Ultrasonic and mechanical stirring at the same time for 2 hours to obtain a uniformly dispersed mixed slurry, which was filtered and vacuum-dried, then transferred to a mold, and cold-pressed at room temperature with a pressure of 100MPa; the cold-pressed composite material was protected by argon, Sintering for 2h, the sintering temperature is 600°C; finally, the sintered composite is hot-extruded at 380°C to obtain the AZ91 / 3.0wt.%MgO-CNTs composite. The mechanical properties of the AZ91 / 3.0wt.%MgO-CNTs composite were tested. Its tensile strength is 300-345MPa, its elongation is 11-12.7%, and its hardness is 81-96HV. It is a composite material with good mechanical...

Embodiment 3

[0022] First, mix 5g of carbon nanotubes chemically coated with magnesia and 600ml of acetone solution, stir for 30min, and then ultrasonically disperse for 2h to obtain a uniformly dispersed carbon nanotube-acetone mixture; then add 95g of AZ91 magnesium alloy powder with a particle size of 325 mesh into the mixture Ultrasonic and mechanical stirring at the same time for 2 hours to obtain a uniformly dispersed mixed slurry, which was filtered and vacuum-dried, then transferred to a mold, and cold-pressed at room temperature with a pressure of 100MPa; the cold-pressed composite material was protected by argon, Sintering for 2h, the sintering temperature is 600°C; finally, the sintered composite material is hot-extruded at 380°C to obtain the AZ91 / 5.0wt.%MgO-CNTs composite material. The mechanical properties of the AZ91 / 5.0wt.%MgO-CNTs composite material were tested. Its tensile strength is 251-272MPa, elongation is 11.2-12.3%, and the hardness is 79-85HV. It is a composite mate...

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Abstract

The invention provides a method for reinforcing a magnesium matrix composite through carbon nanotubes coated with magnesium oxide. 1-5 g of carbon nanotubes chemically coated with magnesium oxide and larger than or equal to 250ml of an acetone solution are mixed and then subjected to ultrasonic dispersion for 1-4 h to obtain uniformly dispersed carbon nanotube and acetone mixed liquor; AZ91 magnesium alloy powder with mass larger than or equal to 95 g and grain size smaller than or equal to 325 meshes is added to the mixed liquor, and then the mixed liquor is stirred mechanically under ultrasonic waves for 1-4 h to obtain mixed slurry; the mixed slurry is subjected to filtration and vacuum drying, then transferred into a die, and subjected to cold pressing under the pressure of 100-600 MPa at a room temperature; a composite after cold pressing is sintered for 2-4 h under the protection of argon at the temperature of 500-600 DEG C; the sintered composite is subjected to hot extrusion at the temperature of 350-400 DEG C. The method is low in process cost, safe, reliable and easy to operate; the carbon nanotubes coated with magnesium oxide are uniformly distributed in magnesium alloy and have high bonding strength with interfaces of matrixes, the grain refinement effect is remarkable, the composite has excellent performance and the method is suitable for industrially preparing the high-performance magnesium alloy composite reinforced by the carbon nanotubes.

Description

technical field [0001] The invention belongs to the field of metal material preparation, in particular to a preparation method of a magnesium-based composite material. Background technique [0002] In recent years, with the rapid development of high-tech fields such as aerospace, machinery, automobile and electronics industries, the demand for magnesium-based composite materials has increased sharply. Magnesium-based composites have the advantages of high specific strength, high specific stiffness, high wear resistance, high vibration damping, etc., and have received unprecedented attention. Since the discovery of carbon nanotubes (CNTs) in 1991, due to its superior comprehensive mechanical properties (elastic modulus above 1TPa, strength about 100 times that of steel), researchers have first thought of making this kind The excellent reinforcing phase is introduced into the magnesium alloy matrix in an attempt to obtain high-performance magnesium-based composites. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/04C22C47/14C22C101/10C22C121/02
Inventor 刘勇曾效舒袁秋红
Owner NANCHANG UNIV
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