Preparation method of micro-nanofiber/ceramic matrix composite

A technology of micro-nano fibers and composite materials, applied in the field of preparation of micro-nano fibers/ceramic matrix composite materials, can solve the problems of poor dispersibility of micro-nano fibers, and achieve the effects of good dispersibility, wide adjustable range and low process temperature

Inactive Publication Date: 2015-07-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to avoid the deficiencies of the prior art, the present invention proposes a preparation method of micro-nano fiber / ceramic matrix composite material, which fully exerts the advantages of micro-nano fiber in improving the mechanical properties of ceramic matrix composite material, and avoids the use of micro-nano fiber in the traditional process. Disadvantages of poor dispersion in the ceramic matrix phase

Method used

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  • Preparation method of micro-nanofiber/ceramic matrix composite
  • Preparation method of micro-nanofiber/ceramic matrix composite
  • Preparation method of micro-nanofiber/ceramic matrix composite

Examples

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Embodiment 1

[0028] (1) Dissolve 1 g of sodium carboxymethyl cellulose in 99 g of deionized water, stir mechanically for 2 h at a stirring speed of 600 r / min, and obtain a colorless and transparent solution with a certain viscosity.

[0029] (2) Add 1.5 g of CNTs to the solution in step (1), and first mechanically disperse at a speed of 300 r / min for 30 min. , and then ultrasonically dispersed for 30 minutes. A suspension of CNTs is obtained.

[0030] (3) Put the CNTs suspension in step (2) into a freeze-drying device, freeze at -40°C for 7h, and then freeze-dry at -20°C and 30Pa vacuum for 35h to obtain an airgel preform of CNTs .

[0031] (4) The SiC substrate is deposited by the CVI process. The process conditions are as follows: trichloromethylsilane is the source material, argon is the dilution gas (flow rate 300m1 / min), hydrogen is the carrier gas (flow rate 200m1 / min), hydrogen and trichloro The molar ratio of methylsilane was 10:1, the deposition temperature was 1000 °C, and the...

Embodiment 2

[0033] (1) Dissolve 0.8 g of sodium carboxymethyl cellulose in 99.2 g of deionized water, stir mechanically for 2 h at a stirring speed of 500 r / min, and obtain a colorless and transparent solution with a certain viscosity.

[0034] (2) Add 2 g of SiC nanowires to the solution in step (1), and first mechanically disperse at a speed of 300 r / min for 45 min. , and then ultrasonically dispersed for 50 minutes. A suspension of SiC nanowires was obtained.

[0035] (3) Put the SiC nanowire suspension in step (2) into a freeze-drying device, freeze at -35°C for 5h, and then freeze-dry at -250°C and 15Pa vacuum for 30h to obtain SiC nanowire gas Gel preforms.

[0036] (4) The SiC substrate is deposited by the CVI process. The process conditions are as follows: trichloromethylsilane is the source material, argon is the dilution gas (flow rate 310m1 / min), hydrogen is the carrier gas (flow rate 220m1 / min), hydrogen and trichloro The molar ratio of methylsilane is 10:1, the deposition ...

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Abstract

The invention discloses a preparation method of micro-nanofiber/ceramic matrix composite. The preparation method comprises the following steps: micro-nanofiber is prepared into an aerogel preform and the preform adopts special microstructures of two-dimensional and three-dimensional micro-nanofiber frameworks, high specific surface area, micro-nano level holes, low density, good dispersity of micro-nanofiber, and the like; on the basis, a pyrolytic carbon interface layer is deposited on the preform by using chemical vapour infiltration (CVI); in the end, a ceramic matrix is deposited to be densified to finish the preparation of the micro-nanofiber/ceramic matrix composite. The micro-nanofiber introduced in the method is good in dispersity and wide in the adjustable range of volume fraction, can fully exert the functions of crack deflection, extraction and bridging of micro-nanofiber and can effectively improve the mechanical property of the composite.

Description

technical field [0001] The invention relates to a method for preparing a micro-nano fiber / ceramic matrix composite material, in particular to a method for preparing a ceramic matrix composite material by reversely infiltrating a ceramic matrix phase into a micro-nano fiber airgel prefabricated body through a CVI process. Background technique [0002] Advanced ceramic materials have the advantages of high temperature resistance, oxidation resistance, wear resistance, corrosion resistance, and low density, but their inherent brittleness greatly limits their applications. In order to overcome the brittleness of ceramic materials and improve the reliability of use, one or more second-phase materials can be added to single-phase ceramics to improve their brittleness and reliability, and various ceramic matrix composites have emerged. The second phase can be fibers (continuous fibers, short fibers, whiskers), particles (microparticles, platelets, nanoparticles), etc. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/565C04B35/622
Inventor 梅辉韩道洋肖珊珊唐健薛望祺成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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