Preparation method of high heat-conducting and high electroconductive CNT interface modified ceramic matrix composite material

A technology of composite materials and high conductivity, which is applied in the field of composite materials to improve the thermal conductivity and electrical conductivity of ceramic matrix composite materials. It can solve the problems of poor dispersion, expensive CVD process equipment, and long time, so as to facilitate industrial production and process stability. Controllable, improved distribution uniformity effect

Active Publication Date: 2019-05-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method prepares CNTs with a special structure, but the CVD process has the disadvantages of expensive equipment, long time and difficult control of the CNT growth process
[0006] Patent No. CN103288466A discloses a method for preparing silicon carbonitride ceramics modified by self-generated carbon nanotubes, using chemical vapor deposition combined with chemical vapor infiltration to synthesize CNT and SiCN matrix at the same time, but this method cannot be used during the growth of CNT. Control its content and uniformity of distribution
[0007] In the prior art, there are defects in the process of preparing doped CNT fiber preforms in the field of composite materials, the current situation that CNT fiber preforms cannot be produced on a large scale, and there are still macroscopically disordered assembly states of CNTs in the existing material system, low mass fraction and dispersion. The disadvantage of poor performance hinders the full play of CNT performance and cannot fully improve the functional properties of composite materials.

Method used

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  • Preparation method of high heat-conducting and high electroconductive CNT interface modified ceramic matrix composite material
  • Preparation method of high heat-conducting and high electroconductive CNT interface modified ceramic matrix composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Step 1. Prepare CNT-nitric acid suspension with CNT and nitric acid at a mass ratio of 1:100, react at 100°C for 1 hour, let the suspension stand for 8 hours, filter off excess nitric acid, place CNT in a dialysis bag, and dialyze After 36 hours until the pH value of the dialysate was neutral, the CNTs were freeze-dried for 12 hours to obtain CNT powder.

[0046] Step 2. Preparation of CNT slurry: Pretreated CNT powder, polyvinyl alcohol, and deionized water in a mass ratio of 4:1:500 were boiled at 90°C for 40 minutes, ultrasonically dispersed to obtain CNT slurry, and the ultrasonic time was 20 minutes .

[0047] Step 3. Fiber sizing: set the sizing machine parameters such as the temperature of the sizing tank to 50°C, the drying temperature to 80°C, and the yarn speed to 20m / min, and use the fiber sizing process to evenly cover the fiber surface with CNT.

[0048] Step 4. Preparation of fiber prefabricated body: use plain weave fiber cloth, wherein the warp density ...

Embodiment 2

[0052] Step 1. CNT pre-oxidation treatment: prepare CNT-nitric acid suspension with CNT and nitric acid at a mass ratio of 1:100, react at 100°C for 1 hour, let the suspension stand for 10 hours, filter off excess nitric acid, and dialyze CNT The bag was dialyzed for 48 hours until the pH value of the dialysate was neutral, and the CNT was freeze-dried for 12 hours to obtain CNT powder.

[0053] Step 2. Preparation of CNT slurry: Pretreated CNT powder, polyvinyl alcohol, and deionized water in a mass ratio of 4:1:500 were boiled at 95°C for 45 minutes, and ultrasonically dispersed to obtain CNT slurry. The ultrasonic time was 25min.

[0054] Step 3. Fiber sizing: set the sizing machine parameters such as sizing tank temperature to 60°C, drying temperature to 90°C, yarn running speed to 30m / min, and use the fiber sizing process to evenly cover the fiber surface with CNT.

[0055] Step 4. Preparing the fiber prefabricated body: using plain weave fiber cloth, wherein the warp an...

Embodiment 3

[0059] Step 1. Prepare CNT-nitric acid suspension with CNT and nitric acid at a mass ratio of 1:135, react at 100°C for 1 hour, let the suspension stand for 8-12 hours, filter off excess nitric acid, and place CNT in a dialysis bag. Dialyze for 36-48 hours until the pH value of the dialysate is neutral, and freeze-dry the CNTs for 12 hours to obtain CNT powder.

[0060] Step 2. Cook the pretreated CNT powder, polyvinyl alcohol, and deionized water at a mass ratio of 4:1:500 at 90-100°C for 50 minutes, and ultrasonically disperse to obtain a CNT slurry. The ultrasonic time is 30 minutes.

[0061] Step 3. Set the sizing machine parameters such as the temperature of the sizing tank to 65°C, the drying temperature to 95°C, and the yarn running speed to 35m / min, and use the fiber sizing process to evenly cover the fiber surface with CNT.

[0062] Step 4. Weave the fiber cloth with a satin weave, wherein the warp and weft density are controlled to be 95 bundles / 10cm. The fiber clot...

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Abstract

The invention relates to a preparation method of a high heat-conducting and high electroconductive CNT interface modified ceramic matrix composite material. CNT is employed for uniform coating of thefiber surface by sizing process, knitting is combined to prepare a composite preform, and chemical vapor deposition is utilized to prepare the ceramic matrix composite material. The method increases the content of CNT in the preform, improves and the distribution uniformity of CNT, and is conducive to giving full play to the high heat conductivity, high electrical conductivity and other excellentproperties of CNT. The heat conductivity of the composite material is enhanced by 5-8 times and the electrical conductivity is enhanced by 5-10 times. Moreover, the method has simple and controllableproduction process, and is conducive to industrial production.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a preparation method of a CNT interface-modified ceramic matrix composite material with high thermal conductivity and high conductivity, which is mainly used in the field of improving the thermal conductivity and electrical conductivity of the ceramic matrix composite material. Background technique [0002] With the development of industrial production technology and aerospace technology, the demand for composite materials is more diverse, and the requirements for material performance are also getting higher and higher. In many fields, such as thermal protection systems of rocket engines and aerospace vehicles, ceramic matrix composites are not only required to have good mechanical properties, but also require materials to have excellent thermal conductivity, electrical conductivity and electromagnetic shielding properties. Therefore, the main development direction of ceramic mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/577C04B35/80C04B35/622
Inventor 刘永胜曹立阳王晶陈杰张运海成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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