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Preparation method of high-thermal-conductivity CNTs directed modification ceramic-based composite material

A composite material and ceramic-based technology, which is applied in the field of preparation of high-thermal-conductivity CNTs directional modified ceramic-based composite materials, can solve problems such as poor thermal conductivity, and achieve the effects of improving thermal conductivity, improving thermal conductivity, and increasing the amount of introduction

Active Publication Date: 2019-04-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a method for preparing high thermal conductivity CNTs directional modified ceramic matrix composites, which solves the technical problem of poor thermal conductivity of ceramic matrix composites, and provides a method that can realize mass production of engineering applications The high thermal conductivity CNTs directionally modified ceramic matrix composite and its preparation method significantly improve the thermal conductivity of the ceramic matrix composite

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  • Preparation method of high-thermal-conductivity CNTs directed modification ceramic-based composite material

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preparation example Construction

[0031] The preparation method proposed by the invention is CNTs directionally modified ceramic matrix composite material. The technical scheme of the method is: using a laser processing-assisted chemical vapor infiltration method to prepare a ceramic matrix composite material prefabricated body, and using CNTs as a second phase to seal and fill the directional holes processed in the thickness direction of the prefabricated body by vacuum impregnation. High thermal conductivity CNTs directional modified ceramic matrix composites have two major features: on the one hand, periodic CNTs directional packing columns are formed in the thickness direction of the ceramic matrix composites, increasing the amount of CNTs introduced and improving thermal conductivity; on the other hand, CNTs disperse and infiltrate The surface of the fiber bundle or fiber filament of the ceramic matrix composite forms a continuous heat conduction network in the direction of the interlayer and the inner lay...

Embodiment 1

[0041] CNTs modified density is 1.40g / cm 3 C / SiC composite materials, the specific process is:

[0042] (1) The preparation density is 1.40g / cm 3 The prefabricated body: T300-1K carbon fiber is used to weave two-dimensional plain weave cloth, and after superimposing 24 layers of stitching, the volume density is 0.74g / cm 3 1. A carbon fiber prefabricated body with a carbon fiber volume fraction of 33.0%. The preform was placed in a CVI vacuum furnace with a deposition temperature of 900°C, an atmosphere pressure of 0.2KPa, a propylene flow rate of 30ml / min, and an Ar flow rate of 300ml / min to prepare a pyrolytic carbon interface layer (PyC) with a pyrolysis thickness of about 200nm. Place the preform in a CVI vacuum furnace with a deposition temperature of 1100°C and an atmosphere pressure of 2KPa, H 2 The flow rate is 200ml / min, the Ar flow rate is 300ml / min, the temperature is naturally lowered after 200-230 hours of deposition, and the density of the prepared shape is 1.4...

Embodiment 2

[0049] CNTs modified density is 1.80g / cm 3 C / SiC composite materials, the specific process is:

[0050] (1) The preparation density is 1.80g / cm 3 The prefabricated body: T300-1K carbon fiber is used to weave two-dimensional plain weave cloth, and after superimposing 24 layers of stitching, the volume density is 0.74g / cm 3 1. A carbon fiber prefabricated body with a carbon fiber volume fraction of 33.0%. The preform was placed in a CVI vacuum furnace with a deposition temperature of 900°C, an atmosphere pressure of 0.2KPa, a propylene flow rate of 30ml / min, and an Ar flow rate of 300ml / min to prepare a pyrolytic carbon interface layer (PyC) with a pyrolysis thickness of about 200nm. Place the preform in a CVI vacuum furnace with a deposition temperature of 1100°C and an atmosphere pressure of 2KPa, H 2 The flow rate is 200ml / min, the Ar flow rate is 300ml / min, the temperature is naturally lowered after 300-400 hours of deposition, and the density of the prepared shape is 1.8...

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Abstract

The invention relates to a preparation method of a high-thermal-conductivity CNTs directed modification ceramic-based composite material. A prefab is subjected to interface layer and matrix preparation in a high-temperature furnace so that the relative density of the prefab can reach 30%-70%; ultra-short pulse lasers are adopted to prepare ceramic-based composite material thickness-direction directed holes; ultrasonic dispersion is adopted to prepare a CNTs solution, and in combination with a vacuum soaking method, filling and sealing are conducted to form CNTs directed columns; a CVI method is adopted to further compact the prefab, and the high-thermal-conductivity CNTs directed modification ceramic-based composite material is finally obtained. The technology has the advantages that through the high-thermal-conductivity CNTs directed columns, the heat conductivity of the composite material in the thickness direction is greatly improved; a CNTs interlayer dispersion structure and the CNTs directed columns form a strong heat conduction network, and the overall heat conductivity of the composite material is improved; the directed holes have designability, the size, interval and distribution of the directed holes can be designed according to engineering requirements, and operation is simple.

Description

technical field [0001] The invention belongs to a preparation method of a ceramic matrix composite material, and relates to a preparation method of a high thermal conductivity CNTs directionally modified ceramic matrix composite material. Specifically, the ultra-short pulse laser is used to design and process directional holes in the thickness direction of the preform, and the ceramic matrix composite material is modified by vacuum impregnation with CNTs solution process, and the CNTs directional packing column and CNTs interlayer dispersion are formed inside the ceramic matrix composite material. structure, and finally constructed the CNTs heat conduction network, the prepared modified ceramic matrix composite has excellent compactness and thermal conductivity, the relative density is increased by 10-33%, and the thermal conductivity is increased by 10-40 times. Background technique [0002] Ceramic matrix composite material is a kind of thermal structure / functional integra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/84
CPCC04B35/806C04B35/80C04B2235/386C04B2235/422C04B2235/522C04B2235/524C04B2235/5244C04B2235/5248C04B2235/77C04B2235/9607
Inventor 王晶刘永胜李精鑫曹立阳成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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