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Micro-region in-situ reaction preparation method for high strength fiber-reinforced ceramic matrix composite material

A high-strength fiber and composite material technology, which is applied in the field of micro-region in-situ reaction preparation of high-strength fiber-reinforced ceramic matrix composite materials, can solve the problems of inability to achieve sintering, low strength of composite materials, and low mechanical properties of composite materials.

Active Publication Date: 2013-05-08
嘉兴睿创新材料有限公司
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Problems solved by technology

When the PIP process is used to densify the ceramic matrix composite, the ceramic products formed by the cracking of the precursor mainly fill the pores in the composite and cannot achieve the effect of sintering. A strong bond cannot be formed between the formed ceramic phases and between the matrix and the surface interface layer of the fiber reinforcement, resulting in lower strength of the composite material prepared by the PIP process than that of the CVI process
[0004] Therefore, there is an urgent need in this field to develop a method to improve the mechanical properties of ceramic matrix composites prepared by the PIP process, which can overcome the low mechanical properties of the composites due to the low bonding strength of the matrix in the preparation of fiber-reinforced ceramic matrix composites by the current PIP process. lack of

Method used

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  • Micro-region in-situ reaction preparation method for high strength fiber-reinforced ceramic matrix composite material
  • Micro-region in-situ reaction preparation method for high strength fiber-reinforced ceramic matrix composite material
  • Micro-region in-situ reaction preparation method for high strength fiber-reinforced ceramic matrix composite material

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preparation example Construction

[0032] The method for preparing high-strength fiber-reinforced ceramic matrix composites of the present invention comprises the following steps:

[0033] (i) Depositing an interface layer on the surface of the composite fiber preform to protect the fiber reinforcement;

[0034] (ii) introducing Si into the pores of the composite fiber preform 3 N 4 a ceramic phase to obtain a composite material preform;

[0035] (iii) Densifying the obtained preform to obtain a ceramic matrix composite material with high density.

[0036] In the present invention, the deposited interface layer includes a PyC interface, a BN interface, a SiC interface and a composite interface formed by the combination of the above interfaces; the thickness of the interface layer is 10-2000nm, preferably 50nm-400nm; in order to improve the composite material matrix With respect to the bonding strength of the interface layer on the surface of the fiber, the outermost layer of the preferred interface layer in ...

Embodiment 1

[0056] Mix polycarbosilane, silicon nitride, and divinylbenzene in a mass ratio (1:0.5:0.5), use xylene as a solvent, and form a uniformly dispersed slurry by wet ball milling for 24 hours. The three-dimensional needle-punched carbon fiber preform deposited with a PyC interface layer with a thickness of about 150 nm was vacuum impregnated in the above slurry to make the slurry penetrate into the pores of the fiber preform, and the impregnation time was 6 hours. The impregnated fiber preform was dried and cured in an Ar atmosphere at 120°C for 6 hours, then heated up to 900°C at a rate of 3°C / min for cracking to obtain a composite material preform, and the holding time was 1 hour. The composite fiber preform was kept at 1600 °C for 1 hour in an Ar atmosphere to make the Si 3 N 4 Microdomain in situ reactions occurred between PCS cracked carbon and PyC interface. Then PCS was used as the precursor, and the PIP process was used to densify the composite material until the weight...

Embodiment 2

[0058] According to Example 1, after forming the composite material preform, the xylene solution of polycarbosilane and divinylbenzene (mass ratio: 1:0.5) was used to carry out 2 PIP cycles, and then the high-temperature micro-region in-situ reaction was carried out. The composites were subsequently densified by the PIP process using PCS as a precursor. The three-point bending strength of the three-dimensional needle-punched C / SiC prepared by this process is 448 MPa. Due to the introduction of more carbon sources into the composite matrix after 2 PIP cycles, the interfacial layer and Si 3 N 4 The degree of reaction between the phases makes the bonding interface slightly weaker than that of the direct high temperature reaction, and the resulting composite material has a slightly lower strength, which makes the fiber pull out obvious and the pull out length longer.

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Abstract

The invention relates to a micro-region in-situ reaction preparation method for a high strength fiber-reinforced ceramic matrix composite material. The method comprises the following steps: (1) depositing an interface layer on the surface of a composite material fiber preform so as to protect fiber reinforcement body, wherein the interface layer comprises a PyC interface, a BN interface, a SiC interface, and a composite interface of the PyC interface, the BN interface and the SiC interface, and a thickness of the interface layer is 10-2000 nm; (2) introducing a Si3N4 ceramic phase to pores of the composite material fiber preform to obtain a composite material pre-molding body; and (3) carrying out a densification treatment on the composite material pre-molding body to obtain the high strength fiber-reinforced ceramic matrix composite material, wherein the densification treatment comprises a high temperature treatment with a temperature of 1200-2300 DEG C, such that the Si3N4 and a carbon-containing phase in the composite material are subjected to a micro-region in-situ reaction through mutual diffusion so as to form the SiC phase.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a method for preparing a high-strength fiber-reinforced ceramic matrix composite material by micro-region in-situ reaction. More specifically, the present invention relates to a method for improving the mechanical properties of fiber-reinforced ceramic matrix composites prepared by PIP (polymer infiltration and pyrolysis, impregnation and cracking of organic precursors). Background technique [0002] Due to a series of advantages such as low density, high strength, high toughness, high temperature resistance, oxidation resistance, and non-brittle fracture, fiber-reinforced ceramic matrix composites are widely used in important fields such as aerospace, national defense, new energy, and transportation. prospect. At present, the common fiber-reinforced ceramic matrix composites mainly include silicon carbide-based composites prepared with carbon fibers and silicon carbide fibers a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/584C04B35/622
CPCC04B2235/5445C04B2235/524C04B35/806C04B2235/3821C04B35/62868C04B2235/3873C04B2235/5252C04B2235/5454C04B2235/80C04B2235/616C04B2235/96C04B35/62873C04B2235/5244C04B35/62894C04B2235/3839C04B2235/614C04B2235/386C04B2235/5256C04B35/573C04B2235/5248C04B35/571C04B2235/3813C04B35/565C04B35/62897C04B2235/3826C04B2235/483C04B35/62863B82Y30/00C04B35/80
Inventor 董绍明吴斌王震张翔宇丁玉生周海军何平高乐
Owner 嘉兴睿创新材料有限公司
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