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A kind of alumina-doped modified carbon-based composite material and preparation method thereof

A composite material and alumina technology, which is applied in the field of alumina doped modified carbon-based composite materials and its preparation, can solve the problems of high equipment requirements, low introduction amount, fiber damage, etc., and achieve high doping amount and non-destructive fiber , low cost effect

Active Publication Date: 2022-02-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the commonly used doping methods mainly include in-situ growth method and electrophoresis method. Although the uniform dispersion of alumina can be achieved, the process is complex, the equipment requirements are high, the amount of introduction is small, and there is also some damage to the fiber.

Method used

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  • A kind of alumina-doped modified carbon-based composite material and preparation method thereof
  • A kind of alumina-doped modified carbon-based composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0045] Take aluminum oxide powder with a particle size of 8 μm and mix it with absolute ethanol. The solid-to-liquid mass volume ratio of the aluminum oxide powder and absolute ethanol is 1g:20mL, vibrate, stir and disperse in an ultrasonic instrument for 2.5h, and wait until fully mixed, Disperse, after there is no agglomeration, immediately spray the prepared aluminum oxide dispersion evenly on the double surface of the corresponding full-net tire single-layer fiber, and the surface density of the full-net tire single-layer fiber is 25g / cm 3 , the single-layer fiber is dried and laminated and needle-punched to obtain an alumina-doped carbon fiber preform. The prepared alumina-doped carbon fiber preform has a hole in the middle, with an inner diameter of 25 mm, an outer diameter of 60 mm, and a height of 40 mm. The density of the obtained alumina-doped carbon fiber preform is 0.2g / cm 3 , the mass fraction of alumina powder in the alumina-doped carbon fiber preform is 5%,

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Embodiment 2

[0053] Take alumina powder with a particle size of 8 μm and mix it with absolute ethanol. The solid-to-liquid mass volume ratio of the alumina powder and absolute ethanol is 1g:25mL, vibrate, stir and disperse in an ultrasonic instrument for 2.5h, and wait until fully mixed, Disperse, after there is no agglomeration, immediately spray the configured alumina dispersion evenly on the surface of the corresponding full-net single-layer fiber, and the surface density of the full-net single-layer fiber is 25g / cm 3 , the single-layer fiber is dried and then stacked and needle-punched. The needle-punched fiber can not only bring alumina into the inner layer of the mesh tire, but also increase the interlayer bonding force; obtain an alumina-doped carbon fiber preform, and the prepared alumina There is a hole in the middle of the doped carbon fiber preform, with an inner diameter of 25mm, an outer diameter of 60mm, and a height of 40mm. The density of the obtained alumina-doped carbon f...

Embodiment 3

[0058] Take alumina powder with a particle size of 8 μm and mix it with absolute ethanol, the solid-to-liquid mass volume ratio of the alumina powder and absolute ethanol is 1g:30mL, vibrate, stir and disperse in an ultrasonic instrument for 2.5h, and wait until fully mixed, Disperse, after there is no agglomeration, immediately spray the configured alumina dispersion evenly on the surface of the corresponding full-net single-layer fiber, and the surface density of the full-net single-layer fiber is 25g / cm 3 , the single-layer fiber is dried and then stacked and needle-punched, which can not only bring alumina into the inside of the mesh layer, but also increase the interlayer bonding force; obtain an alumina-doped carbon fiber preform, and the prepared alumina-doped carbon fiber There is a hole in the middle of the preform, with an inner diameter of 25mm, an outer diameter of 60mm, and a height of 40mm. The density of the obtained alumina-doped carbon fiber preform is 0.2g / cm...

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Abstract

The invention discloses an alumina-doped modified carbon-based composite material and a preparation method thereof. The preparation method is to spray a mixed solution dispersed with alumina powder on both surfaces of a single-layer full-network fiber, and then Alumina-doped carbon fiber preforms are obtained by needle-punching a single layer of full mesh fiber lamination containing alumina powder, and then the alumina-doped carbon fiber preforms are densified by chemical vapor deposition to obtain alumina-doped modified carbon matrix composites . The prepared alumina-doped modified carbon-based composite material is a cylinder with a hole in the center. In the vapor phase deposition process, the rapid densification of the preform is realized through the rapid densification process of the differential pressure method. The invention innovatively adds alumina in the weaving process, and at the same time combines the pressure difference rapid densification process. The inventive method is simple and controllable, and the alumina particles in the composite material are evenly distributed. At the same time, it has the advantages of low cost, easy to obtain raw materials, and no damage to the fiber. And other characteristics, suitable for large-scale production and application.

Description

technical field [0001] The invention belongs to the technical field of carbon-based composite material preparation, and in particular relates to an aluminum oxide-doped modified carbon-based composite material and a preparation method thereof. Background technique [0002] When applying carbon-carbon materials, they are often modified. For example, modifying carbon / carbon materials by adding a second-phase medium can play two roles: 1. Adding a second-phase medium to improve carbon / carbon The organizational structure of composite materials improves its mechanical properties, anti-ablation and friction and wear properties, and better meets the needs of original fields for materials. 2. By adding the second phase medium to modify the carbon / carbon composite material to give it new functionality, and explore its application value in new fields. [0003] When used in the field of electron emission, the material needs to have the properties of high temperature resistance, ablati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/52C04B35/622
CPCC04B35/83C04B35/52C04B35/622C04B2235/77C04B2235/3217C04B2235/5248C04B2235/9607
Inventor 张福勤王化中吕波夏莉红杨宇
Owner CENT SOUTH UNIV