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An isotropic strain monitoring method for composite materials based on carbon nanotube film

A technology of carbon nanotube film and carbon nanotube film, which is applied in the field of preparation of carbon nanotube alignment film and its composite materials, and achieves the effects of wide application, increased effective length and high sensitivity

Active Publication Date: 2019-02-22
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, in the process of strain monitoring using the traditional whole carbon nanotube film, due to the piezoresistive effect, the resistance of the carbon tube film is affected by the comprehensive effect of deformation in multiple directions. It is urgent to develop a strain monitoring method to realize the strain in a certain direction. monitor

Method used

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  • An isotropic strain monitoring method for composite materials based on carbon nanotube film
  • An isotropic strain monitoring method for composite materials based on carbon nanotube film
  • An isotropic strain monitoring method for composite materials based on carbon nanotube film

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preparation example Construction

[0049] The invention provides a method for monitoring the isotropic strain of a composite material based on a carbon nanotube film, the preparation method comprising the following steps:

[0050] The first step is the preparation of random carbon nanotube films.

[0051] The film can be prepared by methods such as vapor deposition; the film is composed of tens to hundreds of thin layers of carbon nanotubes with a thickness not less than 0.1 μm. distributed along the thickness, see figure 1 . The preparation of the carbon nanotube film by the vapor deposition method comprises the following steps:

[0052] Under the protection of an inert gas (such as argon, hydrogen or a mixture of the two), inject the mixed system of carbon source ethanol, thiophene and catalyst ferrocene into a high-temperature tube furnace. At the other end of the high-temperature tube furnace, a winding device is used to collect the formed carbon nanotube airgel. The thickness of the single-layer airgel ...

Embodiment 1

[0067] Applying the preparation method provided by the present invention, by compounding the non-oriented carbon nanotube film / epoxy composite film with the glass fiber composite material, the glass fiber composite material capable of axial strain monitoring is prepared, and the specific steps are as follows:

[0068] The first step, the preparation of carbon nanotube film;

[0069] Under the protection of an inert gas, the mixture of ethanol, ferrocene and thiophene was injected into a high-temperature tube furnace at 1300° C. at a rate of 0.15 ml / min. The inert gas is a mixture of argon and hydrogen (volume ratio 1:1), and its flow rate is 4000 sccm. Continuous carbon nanotube airgel is formed at the other end of the high-temperature tube furnace, and the carbon nanotube airgel is collected by a winding device. The width of the drum is 3cm, the diameter is 0.5m, and the thickness of the single layer of carbon nanotube airgel is about 0.1μm. At the same time, the carbon nano...

Embodiment 2

[0077] Apply the preparation method provided by the present invention, carry out drawing orientation by rollers, prepare a carbon nanotube film with a draft rate of 30%, and further compound with carbon fiber epoxy prepreg to prepare a carbon fiber epoxy film capable of lateral strain monitoring composite material. Specific steps are as follows:

[0078] The first step, the preparation of carbon nanotube film;

[0079] Under the protection of an inert gas, the mixture of ethanol, ferrocene and thiophene was injected into a high-temperature tube furnace at 1300° C. at a rate of 0.15 ml / min. The inert gas is a mixture of argon and hydrogen (volume ratio 1:1), and its flow rate is 4000 sccm. Continuous carbon nanotube aerogels are formed at the other end of the high-temperature tube furnace, and the carbon nanotube aerogels are collected by a winding device with a width of 5 cm and a diameter of 0.5 m. After collection, the carbon nanotube airgel was sprayed with ethanol to ob...

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Abstract

The invention discloses an integrated stress monitoring method for a carbon nanotube film / composite material, and the method comprises the steps: preparing a carbon nanotube alignment film; cutting the carbon nanotube alignment film into U-shaped toothed sensors according to the demands; carrying out the recombination of the prepared carbon nanotube film stress sensors and resin, and forming a carbon nanotube alignment film prefabricated body through precuring; carrying out the laying of the composite material, enabling the carbon nanotube alignment film prefabricated body to be laid on the upper and lower surfaces of a composite material prepreg, and forming a carbon nanotube film composite material which can be used for stress monitoring; connecting an electrode material, carrying out the online monitoring of stress, applying the stress to the composite material in various types of loading modes, recording the change of a resistance instrument, and calculating the real-time change of the stress. According to the invention, the prepared carbon nanotube film composite material stress sensors can effectively monitor various types of stress on the composite material, are quick in response, are high in sensitivity, and avoid the impact from multidirectional stress caused by the Poisson effect of the sensors. Meanwhile, the piezoresistance characteristics of carbon nanotubes can be played in a better way through traction alignment.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanotube oriented film and a composite material thereof. Through reasonable structural design, the carbon nanotube film and the composite material can be integrated to monitor the strain in all directions of the material. Background technique [0002] Since the discovery of carbon nanotubes (CNTs) by Japanese electron microscope expert Iijima in 1991, experts in different fields have become interested in this unique one-dimensional graphite structure. Carbon nanotubes have extremely high tensile strength, elastic modulus, and elastic deformation, and their comprehensive properties are higher than any traditional materials that have been discovered. For example, the modulus of single-walled carbon nanotubes is as high as 1TPa (about 5 times that of steel), its tensile strength is generally distributed between 50-200GPa, and the density of single-walled carbon nanotubes is only 1.2g / cm 3 about. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 王绍凯李敏王印顾轶卓张佐光
Owner BEIHANG UNIV
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