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Impregnation method of carbon fiber preform and preparation method of ceramic-based composite material

A carbon fiber prefabricated body and composite material technology, which is applied in the impregnation of carbon fiber prefabricated bodies, the preparation of composite materials, and the preparation of ceramic matrix composite materials. It can solve the problems of long time, large volume shrinkage, and high energy consumption.

Active Publication Date: 2020-10-30
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can better penetrate into the interior of the composite material, a large number of small molecules will overflow when the organic matter is cracked, resulting in low density, high porosity, large volume shrinkage, and low material performance of the prepared ceramic matrix composite material. Cyclic impregnation cracking takes a long time, high energy consumption, and high cost; in addition, if impregnated with this method, if you want to obtain ultra-high temperature resistant ceramic matrix composites, you need to introduce ultra-high temperature ceramic precursors into the organic solution, but there is still no better solution. Ultra-high temperature ceramic precursor

Method used

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  • Impregnation method of carbon fiber preform and preparation method of ceramic-based composite material
  • Impregnation method of carbon fiber preform and preparation method of ceramic-based composite material
  • Impregnation method of carbon fiber preform and preparation method of ceramic-based composite material

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Embodiment 1

[0049] A method for impregnating a carbon fiber prefabricated body, comprising the following steps:

[0050] Step 1: Fill the powder slurry into the carbon fiber preform. The powder in the powder slurry includes SiC powder and ultra-high temperature ceramic powder. In order to make the content of ultra-high temperature ceramic powder in the carbon fiber preform within a reasonable range Inside, the bulk density of the carbon fiber preform is 0.6-0.9g / cm 3 , the open porosity is 55vol%-65vol%; the particle size of SiC powder and ultra-high temperature ceramic powder is not less than 0.5 μm, and does not exceed the pore size of the holes in the carbon fiber prefabricated body; the powder slurry also includes a stabilizer, The stabilizer is polyacrylamine, polyacrylamide or polyethyleneimine, the mass fraction of the stabilizer in the powder slurry is 0.4%wt-1%wt, and the volume content of the powder is 20vol%-40vol%.

[0051] As a preferred solution, polyacrylamide is selected ...

Embodiment 2

[0065] In this embodiment, ZrB2 is used as ultra-high temperature ceramics, polyacrylamine is used as a stabilizer, polycarbosilane is used as a ceramic precursor, divinyl is used as an organic solvent, and acrylate is used as a binder as a specific implementation mode, and the present invention is made Further explanation.

[0066] A preparation method of the ceramic matrix composite material of the present invention, comprising the following steps:

[0067] (1) ZrB 2 Powder, SiC powder, polyacrylic acid amine, ammonia water, grinding balls, and water are mixed in a certain proportion, and powder slurry A with a particle size of 0.5 μm is obtained after being ground by a stirring mill, wherein ZrB 2 The volume ratio of powder to SiC powder is 4:1, the volume content of powder is 20vol%, the mass fraction of polyacrylamide is 0.4%wt, the ball-to-material ratio is 1:4, and the pH is adjusted to 9-11. Under this condition, the entanglement of polyacrylamide with polycarbosilan...

Embodiment 3

[0077] In this embodiment, ZrB2 is used as ultra-high temperature ceramics, polyacrylamine is used as a stabilizer, polycarbosilane is used as a ceramic precursor, divinyl is used as an organic solvent, and acrylate is used as a binder as a specific implementation mode, and the present invention is made Further explanation.

[0078] A preparation method of the ceramic matrix composite material of the present invention, comprising the following steps:

[0079] (1) ZrB 2 Powder, SiC powder, polyacrylic acid amine, ammonia water, grinding balls, and water are mixed in a certain proportion, and powder slurry A with a particle size of 2 μm is obtained after being ground by a stirring mill, wherein ZrB 2 The volume ratio of powder to SiC powder is 4:1, the volume content of powder is 35vol%, the mass fraction of polyacrylamide is 0.5%wt, the ball-to-material ratio is 1:1, and the pH is adjusted to 10;

[0080] Dissolving polycarbosilane and divinylbenzene in a ratio of 1:1 to obta...

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Abstract

The invention discloses an impregnation method of a carbon fiber preform, which comprises the following steps of: 1, filling a carbon fiber preform with a powder slurry, the powder in the powder slurry comprising SiC powder, ultra-high temperature ceramic powder and SiC powder, and the particle size of the ultra-high temperature ceramic powder being not less than 0.5 [mu]m; 2, pre-curing the carbon fiber preform filled with the powder slurry in the step 1, so as to enable the powder slurry to be attached to the carbon fiber preform; and 3, impregnating the pre-cured carbon fiber preform in thestep 2 with an organic solution containing a ceramic precursor. The invention also discloses a method for preparing a ceramic-based composite material. The method solves the problem of long preparation time of the ceramic-based composite material.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a method for preparing a composite material, in particular to a method for impregnating a carbon fiber prefabricated body and a method for preparing a ceramic matrix composite material. Background technique [0002] C / SiC composites are one of the ideal materials for the preparation of supersonic aircraft, but they cannot be used at high temperatures (greater than 1800°C). Recent studies have found that introducing ultra-high temperature ceramic phases into C / SiC ceramic composites can further improve its use. The so-called ultra-high temperature ceramics refer to carbides, borides (such as ZrB2) and nitrides with a melting point exceeding 3000 °C. [0003] Impregnation is one of the commonly used processes for preparing C / SiC composite materials. The impregnation raw materials mainly include powder slurry and organic solution. [0004] The former is to introduce the c...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/80C04B35/622
CPCC04B35/58078C04B35/622C04B2235/616C04B2235/614C04B2235/5248C04B2235/3826C04B2235/48C04B2235/483C04B2235/5445C04B2235/658C04B2235/656
Inventor 姜凯周长灵徐鸿照杨芳红李涵张家路
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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