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Carbon nano tube-aluminium oxide composite material and preparation method thereof

A technology of carbon nanotubes and composite materials, which is applied in the field of materials, can solve the problems of poor toughness and restrict the expansion of application fields, and achieve the effects of continuous performance, improved fracture toughness, and simple process

Inactive Publication Date: 2014-08-13
XUCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, as a ceramic material, alumina material is very brittle and has poor toughness, which seriously restricts the expansion of its application field.

Method used

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  • Carbon nano tube-aluminium oxide composite material and preparation method thereof
  • Carbon nano tube-aluminium oxide composite material and preparation method thereof
  • Carbon nano tube-aluminium oxide composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The carbon nanotube-alumina composite material of the present invention is composed of carbon nanotubes and alumina; wherein the weight percentage of the carbon nanotubes is 1%.

[0029] The specific steps of the method for preparing the carbon nanotube-alumina composite material of the present invention are as follows:

[0030] (1) First, prepare carbon nanotube-alumina composite powder by shearing method according to the ratio; add carbon nanotube and alumina powder to the molten polyethylene melt and stir and mix; add the mixture to the twin-screw extruder Or extrude and disperse in a single-screw extruder until it is stable; degrease the extruded material at high temperature, and remove the polymer material to obtain a carbon nanotube-alumina composite powder.

[0031] (2) Then add the PVA solution that the mass concentration is 5% to the carbon nanotube-alumina composite powder, then stir evenly, the PVA solution addition is 6% of composite powder weight, then dry;...

Embodiment 2

[0035] The carbon nanotube-alumina composite material of the invention is composed of carbon nanotubes and alumina; wherein the weight percentage of the carbon nanotubes is 0.1%.

[0036] The specific steps of the method for preparing the carbon nanotube-alumina composite material of the present invention are as follows:

[0037] (1) First, prepare carbon nanotube-alumina composite powder by shearing method according to the ratio; add carbon nanotube and alumina powder into molten polyvinyl chloride and polyoxymethylene melt and stir and mix; add the mixture to double Extrude and disperse in a screw extruder or a single-screw extruder until it is stable; degrease the extruded material at high temperature, and remove the polymer material to obtain a carbon nanotube-alumina composite powder.

[0038] (2) Then add the PVA solution that the mass concentration is 5% to the carbon nanotube-alumina composite powder, then stir evenly, the PVA solution addition is 2% of composite powde...

Embodiment 3

[0042] The carbon nanotube-alumina composite material of the present invention is composed of carbon nanotubes and alumina; wherein the weight percentage of the carbon nanotubes is 6%.

[0043] The specific steps of the method for preparing the carbon nanotube-alumina composite material of the present invention are as follows:

[0044] (1) First, prepare carbon nanotube-alumina composite powder by shearing method according to the proportion; add carbon nanotube and alumina powder into the molten paraffin melt and stir and mix according to the proportion; add the mixture to the twin-screw extruder extruder or single-screw extruder until the dispersion is stable; degrease the extruded material at high temperature, and remove the polymer material to obtain carbon nanotube-alumina composite powder.

[0045] (2) Then add the PVA solution that the mass concentration is 5% to the carbon nanotube-alumina composite powder, then stir evenly, the PVA solution addition is 10% of composite...

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Abstract

The invention discloses a carbon nano tube-aluminium oxide composite material. The composite material consists of carbon nano tubes and aluminium oxide, wherein the content of the carbon nano tubes in weight percent is 0.1%-6%. The composite material is prepared by virtue of a hot-pressing sintering technology and the carbon nano tubes are uniformly dispersed in an aluminium oxide matrix material. By hot-pressing sintering, the problem about the compacting sintering of the composite material can be solved; besides, the sintering temperature is lowered remarkably and the sintering time is prolonged. The compactness of the composite material reaches 98.8%, and the fracture toughness of the composite material reaches 6.32MPam1 / 2 which is improved by about 99.2% compared with that of the aluminium oxide material. XRD (X Ray Diffraction) and SEM (Scanning Electron Microscope) results show that under the hot-pressing sintering condition, the composite material forms an intact sintered phase and is high in compactness, transgranular fractures are interlaced with intergranular fractures on the matrix, the carbon nano tubes are uniformly dispersed in the aluminium oxide matrix and no agglomeration phenomenon happen.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a carbon nanotube-alumina composite material and a preparation method thereof. Background technique [0002] Alumina ceramic materials have excellent strength and hardness, and the Mohs hardness reaches 9. It is an inorganic structural material with great application prospects. At the same time, as a ceramic material, alumina material is very brittle and has poor toughness, which seriously restricts the expansion of its application field. How to improve the toughness of alumina materials is one of the key technologies for the application of alumina structural materials. At present, the methods of toughening and modifying alumina include: zirconia phase transformation toughened alumina, nanocrystalline toughened alumina, alumina fiber toughened alumina and other methods. Carbon nanotubes have very good mechanical properties, with a tensile strength of 50-200GPa, 100 times that...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/63C04B35/622
Inventor 武玺旺朱聪旭索江飞符俊杰李森林吴国栋邹伟
Owner XUCHANG UNIV
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