阅读说明：本技术 一种碳纳米管复合材料的制备方法 (Preparation method of carbon nano tube composite material ) 是由 朱敏峰 李博 王兵 于缘宝 朱小琪 邹海平 李显信 于 2019-12-25 设计创作，主要内容包括：本发明公开了一种碳纳米管复合材料的制备方法,包括以下步骤：(1)将一定量的CNTs与纳米Si粉加入乙二醇中,然后加入一定量的两亲型表面活性剂,然后超声震荡1-3h,使CNTs与纳米Si粉在乙二醇中充分分散,然后在1200-1400℃下进行反应热处理,得到SiC包覆CNTs表面的CNTs-SiC复合粉末；(2)将CNTs-SiC复合材料和Al粉加入无水乙醇中,超声分散1-3h后加入胶体磨中研磨2-10min,然后置于40-50℃的真空烘箱中干燥2-4h,即得Al和CNTs-SiC复合粉末；(3)将制备的复合粉末置于石墨模具中,在600-650℃下30-40MPa的压力下烧结1-2h即得铝基CNTs-SiC复合材料。本发明制备的铝基CNTs-SiC复合材料具有高热学、高电学、高力学性能。(The invention discloses a preparation method of a carbon nano tube composite material, which comprises the following steps: (1) adding a certain amount of CNTs and nano Si powder into ethylene glycol, then adding a certain amount of amphiphilic surfactant, then carrying out ultrasonic oscillation for 1-3h to fully disperse the CNTs and the nano Si powder in the ethylene glycol, and then carrying out reaction heat treatment at the temperature of 1200-1400 ℃ to obtain CNTs-SiC composite powder with the surface of SiC coated CNTs; (2) adding the CNTs-SiC composite material and Al powder into absolute ethyl alcohol, ultrasonically dispersing for 1-3h, adding into a colloid mill, grinding for 2-10min, and then placing into a vacuum oven at 40-50 ℃ for drying for 2-4h to obtain Al and CNTs-SiC composite powder; (3) and placing the prepared composite powder in a graphite mold, and sintering for 1-2h at the temperature of 600-650 ℃ and under the pressure of 30-40MPa to obtain the aluminum-based CNTs-SiC composite material. The aluminum-based CNTs-SiC composite material prepared by the invention has high thermal, high electrical and high mechanical properties.)

1. A preparation method of a carbon nanotube composite material is characterized by comprising the following steps:

(1) adding a certain amount of CNTs and nano Si powder into ethylene glycol, then adding a certain amount of amphiphilic surfactant, then carrying out ultrasonic oscillation for 1-3h to fully disperse the CNTs and the nano Si powder in the ethylene glycol, and then carrying out reaction heat treatment at the temperature of 1200-1400 ℃ to obtain CNTs-SiC composite powder with the surface of SiC coated CNTs;

(2) adding the CNTs-SiC composite material and Al powder into absolute ethyl alcohol, ultrasonically dispersing for 1-3h, adding into a colloid mill, grinding for 2-10min, and then placing into a vacuum oven at 40-50 ℃ for drying for 2-4h to obtain Al and CNTs-SiC composite powder;

(3) and (3) placing the composite powder prepared in the step (2) in a graphite mold, and sintering for 1-2h at the temperature of 600-.

2. The method for preparing a carbon nanotube composite material according to claim 1, wherein the CNTs, the nano Si powder and the ethylene glycol are added in the step (1) in a mass ratio of 1 (0.6-1.5) to (30-50), and the amount of the amphiphilic surfactant is 0.02-0.1 times of the weight of the CNTs.

3. The method of claim 1, wherein the amphiphilic surfactant in step (1) is one of cetyltrimethyl ammonium bromide (CTAB) and cetyltrimethyl ammonium chloride (CTAC).

4. The method for preparing a carbon nanotube composite material as claimed in claim 1, wherein the CNTs-SiC composite material, the Al powder and the absolute ethyl alcohol are added in the step (2) in a mass ratio of 1 (0.1-0.2) to (10-20).

5. The method according to claim 1, wherein the carbon nanotubes are multi-walled carbon nanotubes having a tube diameter of 5-40nm and a tube length of 30 μm-100 μm.

6. The method of claim 1, wherein the Al powder has an average particle size of 20-40 μm and a purity of 99% or higher.

7. The method of claim 1, wherein the nano-Si powder has an average particle size of 20 to 40 μm and a purity of 99% or higher.

Technical Field

The invention belongs to the technical field of carbon nanotubes, and particularly relates to a preparation method of a carbon nanotube composite material.

Background

As a novel nano carbon material, Carbon Nanotubes (CNTs) are an allotrope of carbon as well as graphite and diamond, inherit the characteristics of high thermal conductivity and high electrical conductivity of graphite, have excellent mechanical properties, serve as an ideal reinforcing phase of a composite material, and have been widely studied. However, as a nano material, CNTs have a high specific surface area due to the nano-scale size and are easy to agglomerate under the action of van der Waals force; poor compatibility with metals, easy occurrence of poor interface reaction, and easy damage to the tubular structure of the CNTs in the preparation process of the composite material, thereby making it difficult to effectively exert the excellent performance of the CNTs.

Disclosure of Invention

The invention aims to provide a preparation method of a carbon nano tube composite material, which solves the problems of dispersion and wetting of CNTs and an Al matrix, and the prepared composite material has high thermal, electrical and mechanical properties.

In order to achieve the purpose, the invention provides the following technical scheme:

a preparation method of a carbon nanotube composite material comprises the following steps:

(1) adding a certain amount of CNTs and nano Si powder into ethylene glycol, then adding a certain amount of amphiphilic surfactant, then carrying out ultrasonic oscillation for 1-3h to fully disperse the CNTs and the nano Si powder in the ethylene glycol, and then carrying out reaction heat treatment at the temperature of 1200-1400 ℃ to obtain CNTs-SiC composite powder with the surface of SiC coated CNTs;

(2) adding the CNTs-SiC composite material and Al powder into absolute ethyl alcohol, ultrasonically dispersing for 1-3h, adding into a colloid mill, grinding for 2-10min, and then placing into a vacuum oven at 40-50 ℃ for drying for 2-4h to obtain Al and CNTs-SiC composite powder;

(3) and (3) placing the composite powder prepared in the step (2) in a graphite mold, and sintering for 1-2h at the temperature of 600-.

Furthermore, the adding mass ratio of the CNTs, the nano Si powder and the ethylene glycol in the step (1) is 1 (0.6-1.5) to (30-50), and the adding amount of the amphiphilic surfactant is 0.02-0.1 time of the weight of the CNTs.

Further, the amphiphilic surfactant in the step (1) is one of Cetyl Trimethyl Ammonium Bromide (CTAB) and Cetyl Trimethyl Ammonium Chloride (CTAC).

Further, the CNTs-SiC composite material, the Al powder and the absolute ethyl alcohol in the step (2) are added in a mass ratio of 1 (0.1-0.2) to (10-20).

Furthermore, the carbon nano tube is a multi-wall carbon nano tube, the tube diameter is 5-40nm, and the tube length is 30-100 μm.

Furthermore, the average grain diameter of the Al powder is 20-40 μm, and the purity is more than or equal to 99%; the average grain diameter of the nano Si powder is 20-40 mu m, and the purity is more than or equal to 99 percent.

Compared with the prior art, the invention has the following beneficial effects:

the invention selects ethylene glycol as dispersant, CNTs and nano Si powder can be well dispersed evenly in the system through ultrasonic oscillation, and the agglomerated CNTs are dispersed, and the addition of amphiphilic surfactant (CTAB/CTAC) provides a position for the adsorption of nano Si powder on the surface of CNTS, which is beneficial to the uniform dispersion of CNTS in a medium and the adsorption of nano Si powder; when the ball milling process is used for mixing the CNTs-SiC composite material and the Al powder, the Al powder is easy to generate plastic deformation; the aluminum-based CNTs-SiC composite material prepared by the invention has high thermal, high electrical and high mechanical properties.

Detailed Description

The present invention will be further described with reference to examples, but the present invention is not limited to these examples.