A kind of preparation method of carbon nanotube-magnesium aluminate composite material and prepared material

A carbon nanotube and composite material technology, which is applied in the field of preparation methods and prepared materials, can solve the problem of low electrical conductivity and the like, and achieves the effects of simple preparation process, increased Seebeck coefficient, and high thermal stability.

Active Publication Date: 2020-01-14
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its low electrical conductivity restricts its application in the field of thermoelectricity

Method used

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  • A kind of preparation method of carbon nanotube-magnesium aluminate composite material and prepared material

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[0028] The preparation method of the carbon nanotube-magnesium aluminate composite material of the embodiment of the present invention, the method comprises the following steps:

[0029] 1) Mix seaweed-like magnesium aluminate powder and carbon nanotubes, add them to the solvent, disperse them ultrasonically for 10-60 minutes, and stir them ultrasonically for 10-60 minutes to obtain a solution, heat the solution to 50-100°C, and evaporate the solvent to obtain a powder body, grinding the powder for 10 to 60 minutes;

[0030] 2) performing spark plasma sintering on the ground powder in step 1) to obtain the carbon nanotube-magnesium aluminate composite material;

[0031] Wherein, the spark plasma sintering includes: the heating rate is 10-100°C / min, the green body sintering pressure is 20-80MPa, the holding temperature is 1100-1300°C, and the holding time is 5-20min;

[0032] The seaweed-like magnesium aluminate powder includes flake-like magnesium aluminate nanocrystals bridg...

Embodiment 1

[0045] Embodiment 1 of the present invention The preparation method of carbon nanotube-magnesium aluminate composite material comprises the following steps:

[0046] 1) Mix seaweed-like magnesium aluminate powder and carbon nanotubes (the mass fraction of carbon nanotubes after mixing is 0.1wt%), add to 100mL isopropanol solvent, ultrasonically disperse for 10min, and then ultrasonically stir for 10min To obtain a solution, the solution was heated to 50° C., the solvent evaporated slowly, and the obtained powder was ball-milled for 10 min.

[0047] 2) The powder prepared in step 1) was subjected to spark plasma sintering, the heating rate of spark plasma sintering was 10°C / min, the sintering pressure of the ceramic green body was 20MPa, the holding temperature was 1100°C, and the holding time was 5min to obtain carbon nanotube-magnesium aluminate ceramic composites.

[0048] The preparation method of the seaweed-like magnesium aluminate powder comprises:

[0049] Dissolve 10...

Embodiment 2

[0053] The preparation method of embodiment 2 of the present invention carbon nanotube-magnesium aluminate composite material comprises the following steps:

[0054] 1) Mix seaweed-like magnesium aluminate powder and carbon nanotubes (the mass fraction of carbon nanotubes after mixing is 50wt%), add to 500mL isopropanol solvent, ultrasonically disperse for 60min, and then ultrasonically stir for 60min to obtain solution, the solution was heated to 100° C., the solvent evaporated slowly, and the obtained powder was ball-milled for 60 minutes.

[0055] 2) The powder prepared in step 1) was subjected to spark plasma sintering, the spark plasma sintering heating rate was 100°C / min, the sintering pressure of the ceramic green body was 80MPa, the holding temperature was 1300°C, and the holding time was 20min to obtain carbon nanotube-magnesium aluminate ceramic composites.

[0056] The preparation method of the seaweed-like magnesium aluminate powder comprises:

[0057] Dissolve 3...

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Abstract

The invention provides a preparation method of a silver nano-particle loaded magnesium aluminate material and prepared materials. The method includes steps: 1) mixing seaweed-shaped magnesium aluminate powder and soluble silver salt solution, ultrasonically dispersing mixture for 10-60min, stirring the mixture for 10-60min, and uniformly mixing the mixture to obtain mixed solution; 2) mixing the mixed solution of the step 1) and reducing agents, stirring mixture for 10-60min, uniformly mixing the mixture, and drying the uniformly-mixed mixture to remove moisture to obtain MgAl2O4 / Ag nano-powder; 3) performing spark plasma sintering on the MgAl2O4 / Ag nano-powder acquired in the step 2) to obtain the silver nano-particle loaded magnesium aluminate material. The weight percentage of soluble silver salt is 0.1-20%. The high-performance ceramic thermoelectric material is prepared by the aid of high conductivity of Ag and a seaweed-shaped one-dimensional transmission structure and a high Seebeck coefficient of magnesium aluminate.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of a carbon nanotube-magnesium aluminate composite material and the prepared material. Background technique [0002] With the increasing energy crisis and environmental pollution, the society's demand for environmental protection, energy saving and energy reuse is increasing. Thermoelectric material is a new type of energy conversion material that is conducive to environmental protection. It can realize the mutual conversion of heat energy and electric energy, and has great application prospects in the field of waste heat power generation. Traditional inorganic thermoelectric materials (Bi 2 Se 3 , Bi 2 Te 3 , PbTe, PbSe, etc.) have a thermoelectric figure of merit ZT of about 1, which has a certain range of applications. However, the elements contained in these materials are toxic, expensive, and rare, which limit thei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/44C04B35/64C04B35/78C04B35/626
CPCC04B35/44C04B35/62605C04B35/64C04B35/78C04B2235/3222C04B2235/5288C04B2235/5454C04B2235/666C04B2235/96C04B2235/9607
Inventor 付萍南雷王子颖李沁键
Owner WUHAN INSTITUTE OF TECHNOLOGY
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