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Preparing method of high-toughness carbon nanotube enhanced metal-based composite

A carbon nanotube and composite material technology, which is applied in the field of carbon nanotube reinforced metal matrix composite material preparation, can solve the problems that stress concentration in the brittle region cannot be effectively relaxed, the strength of the composite material is decreased, and the toughness is not significantly improved, and the like. It is convenient for mass production, improves strength and toughness, and has the effect of excellent toughness and toughness.

Inactive Publication Date: 2017-05-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the size of the constructed ductile zone is more than tens of microns, the stress concentration of the brittle zone in the ductile zone cannot be effectively relaxed, so the improvement of toughness is not obvious, and the introduction of a large number of low-strength toughness zones makes the composite The strength of the material is greatly reduced

Method used

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  • Preparing method of high-toughness carbon nanotube enhanced metal-based composite
  • Preparing method of high-toughness carbon nanotube enhanced metal-based composite
  • Preparing method of high-toughness carbon nanotube enhanced metal-based composite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The pre-alloyed 2009Al powder (composed of Al powder, Mg powder, Cu copper element powder) with an average size of 10 μm and multi-walled CNT with a content of 4vol.% was added to the stirring ball mill, and 2wt.% stearic acid was added as Process control agent, feed argon and cooling water, ball mill at 400rpm for 6 hours to obtain a uniformly dispersed CNT / 2009Al composite powder; add 33wt.% of 2009Al alloy powder with a size of about 10 μm to the composite powder , put into a blender and run at 50rpm for 4 hours to make it evenly mixed to obtain the final composite material powder. Subsequently, the composite ingot was obtained by cold pressing and vacuum hot pressing; the ingot was subjected to hot extrusion with an extrusion ratio of 16:1 to obtain the final hierarchical structure of 3vol.%CNT / 2009Al composite material, and its corresponding classification Structural microstructure see figure 2 , the width of the ductile zone is about 2 μm, and it is distributed ...

Embodiment 2

[0033] Add pre-alloyed 5083Al powder (composed of Al powder, Mg powder element powder) with an average size of 10 μm and multi-walled CNT with a content of 4.5vol.% into the stirring ball mill, and add 2wt.% stearic acid for process control agent, feed argon and cooling water and ball mill at 400rpm for 8 hours to obtain uniformly dispersed CNT / 5083Al composite material powder; add 50wt.% of 5083Al alloy powder with a size of about 10 μm in the composite material powder, put The blender was operated at 60 rpm for 5 hours to make it evenly mixed to obtain the final composite material powder. Subsequently, the composite billet was obtained by cold pressing and vacuum hot pressing; the billet was subjected to hot extrusion with an extrusion ratio of 25:1 to obtain the final uniformly dispersed 3vol.%CNT / 5083Al composite material. The yield strength of the composite material reaches 501MPa, the tensile strength is 610MPa, and the elongation is about 5%.

Embodiment 3

[0037] Add 6061Al alloy powder with an average size of 30μm and single-walled CNT with a content of 4vol.% to the stirring ball mill, add 2wt.% liquid paraffin as a process control agent, feed argon and cooling water, and ball mill at 350rpm Obtain uniformly dispersed CNT / 6061Al composite material powder in 6 hours; In this composite material powder, add the 6061Al alloy powder that content is 33wt.% and the size is about 10 μ m, put into the blender and run under 80rpm for 5 hours to make it mix Uniformly, the final composite material powder is obtained. Subsequently, the composite billet was obtained by cold pressing and vacuum hot pressing; the billet was subjected to hot forging with a forging ratio of 5:1 to obtain the final hierarchical structure 3vol.%CNT / 6061Al composite material. The yield strength of the composite material T4 after treatment reaches 400MPa, the tensile strength is 510MPa, and the elongation is about 5%.

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Abstract

The invention belongs to the technical field of composites, and particularly relates to a preparing method of a high-toughness carbon nanotube enhanced aluminum-based composite of a grading structure. Due to the fact that the small and fine toughness area is introduced in the carbon nanotube enhanced aluminum-based composite prepared through the method to form the grading structure, the more excellent toughness is shown compared with that of a homogeneous composite. Through high-energy ball milling, uniformly-dispersed carbon nanotube enhanced aluminum-based composite powder is prepared, micron aluminum powder is added in the composite powder secondarily, through mixing, final carbon nanotube enhanced aluminum-based composite powder is obtained, and through subsequent compactness and secondary processing, the final composite is obtained. The method has the beneficial effects that the process is simple and efficient, and large-scale production capacity is achieved; the prepared composite of the grading structure has the small and fine toughness area, and therefore the excellent strong toughness is shown.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and specifically provides a preparation method of a high-strength carbon nanotube-reinforced metal-based composite material with a hierarchical structure. The composite material prepared by the method can not only effectively exert the strengthening effect of the carbon nanotubes, but also maintain good toughness of the composite material due to the introduction of fine toughness zones. Background technique [0002] Carbon nanotubes (CNTs) have extremely high mechanical properties (tensile strength > 10GPa, elastic modulus ~ 1GPa), large aspect ratio, and are considered to be ideal reinforcements for composite materials. Adding a small amount of carbon nanotubes to the aluminum alloy matrix is ​​expected to prepare high-strength, high-modulus aluminum matrix composites, which have broad application prospects in the aerospace field. However, while the addition of carbon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C21/00
CPCC22C21/00C22C1/05C22C26/00C22C2026/002
Inventor 刘振宇马宗义肖伯律赵柯倪丁瑞王全兆王东张星星
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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