Preparation method of high-volume-fraction carbon-nanotube-enhanced metal-based composite material

A high volume fraction, carbon nanotube technology, applied in the field of composite material preparation, can solve the problems of inability to precisely control the volume fraction of carbon nanotubes, difficult to prepare large-scale composite materials, and macroscopically inhomogeneous materials, and achieve grain refinement. , Large aspect ratio, small damage effect

Active Publication Date: 2013-05-08
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, the volume fraction of carbon nanotubes cannot be precisely controlled by this preparation method, and it is difficult to prepare large-scale composite materials. In additi

Method used

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  • Preparation method of high-volume-fraction carbon-nanotube-enhanced metal-based composite material
  • Preparation method of high-volume-fraction carbon-nanotube-enhanced metal-based composite material
  • Preparation method of high-volume-fraction carbon-nanotube-enhanced metal-based composite material

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Effect test

Embodiment 1

[0030] A carbon nanotube reinforced 2009Al composite material with a volume fraction of carbon nanotubes of 1.5 vol.% was prepared. According to the volume ratio of aluminum alloy: carbon nanotube = 98.5: 1.5, weigh the aluminum alloy powder and carbon nanotube powder with purity of 99.5% and 98%, particle size of 13μm and Φ20nm×5μm, and mix them in a mixer 2 After hours, the mixed powder was put into a mold and cold pressed at room temperature with a pressure of 20 MPa. Put the cold-pressed billet together with the mold into a vacuum hot-pressing furnace to raise the temperature to 560°C, keep it for 30 minutes and then perform hot-pressing, and the hot-pressing pressure is 80MPa. FSW-5LM-020 friction stir welding machine is used to perform friction stir processing on the hot pressed ingot. The processing technology is: the tool speed is 1000 revolutions, and the travel speed is 100 mm / min. Using sequential lap processing followed by in-situ repeated processing, first lap 5 t...

Embodiment 2

[0034] A carbon nanotube reinforced 2024Al composite material with a volume fraction of carbon nanotubes of 4.5 vol.% was prepared. According to the volume ratio of aluminum alloy: carbon nanotube = 95.5: 4.5, weigh the aluminum alloy powder and carbon nanotube powder with purity of 99.5% and 98%, particle size of 13μm and Φ15nm×2.5μm, and mix them in a mixer Evenly, put the mixed powder into a mold and cold press at room temperature with a pressure of 40 MPa. Put the cold-pressed billet together with the mold into a vacuum hot-pressing furnace to raise the temperature to 580°C, hold for 30 minutes and then perform hot-pressing, and the hot-pressing pressure is 60MPa. The hot-pressed ingot is subjected to friction stir processing, the processing technology is: the tool speed is 800 rpm, and the traveling speed is 100 mm / min. Using in-situ repeated processing and then overlapping processing method, first in-situ repeated processing 3 times to form a processing area, and then us...

Embodiment 3

[0038] A carbon nanotube reinforced pure copper-based composite material with a volume fraction of carbon nanotubes of 1.5 vol.% was prepared. According to the volume ratio of copper: carbon nanotube = 98.5: 1.5, weigh copper powder and carbon nanotube powder with purity of 99.5% and 98%, particle size of 8μm and Φ20nm×5μm respectively, and mix them in a mixer for 3 hours. The mixed powder is put into a mold and cold pressed at room temperature with a pressure of 20 MPa. Put the cold-pressed billet together with the mold into a vacuum hot-pressing furnace to raise the temperature to 1000° C., hold for 60 minutes and then hot-press, and the hot-pressing pressure is 10 MPa. The hot-pressed ingot is processed by friction stir, the processing technology is: the tool speed is 1500 rpm, and the traveling speed is 80 mm / min. Using sequential lap processing followed by in-situ repetition, 10 processing areas are formed by sequential lap in a single pass, with an overlap rate of 50%. A...

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Abstract

The invention discloses a preparation method of a high-volume-fraction carbon-nanotube-enhanced metal-based composite material. The invention belongs to the technical field of composite material preparation. According to the invention, metal powder and carbon nanotube are adopted as raw materials; a carbon-nanotube-enhanced metal-based composite material billet is prepared with a powder metallurgy method; and the obtained powder metallurgy billet is subjected to friction stir processing, such that the carbon-nanotube-enhanced metal-based composite material is obtained. The method provided by the invention has the advantages that: (1) the morphology and size of the carbon nanotube are not restricted; the carbon nanotube does not need other preprocessing processes (such as acid treatment, pre-dispersion, and the like); the dose of carbon nanotube is high, and the content can be accurately controlled; (2) in the prepared composite material, carbon nanotube dispersion is uniform, aspect ratio is high, and damage is low; (3) the gains of the prepared composite material is substantially refined (smaller than 5mum); and (4) the prepared composite material has excellent mechanical properties.

Description

Technical field [0001] The invention belongs to the technical field of composite material preparation, and specifically relates to a method for preparing a carbon nanotube reinforced metal matrix composite material with a high volume fraction. The method can achieve good dispersion of high volume fraction of carbon nanotubes in the metal matrix, and at the same time can refine the matrix crystal grains. Background technique [0002] Carbon nanotubes have extremely high mechanical properties (tensile strength>30GPa, elastic modulus>1GPa), good thermal and electrical properties, and are considered as ideal reinforcements for composite materials. Carbon nanotube-reinforced metal matrix composites have high specific strength, high specific stiffness, and potentially excellent electrical and thermal conductivity. They have broad application prospects in aerospace, automobile manufacturing, microelectronics and other fields. Carbon nanotubes do not infiltrate most metals and the...

Claims

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Application Information

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IPC IPC(8): C22C47/14C22C47/00C22C101/10
Inventor 马宗义刘振宇肖伯律
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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