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A preparation method of carbon nanotube multi-dimensional braided prefabricated ceramic matrix composite material

A composite material and carbon nanotube technology, which is applied in the field of preparation methods of ceramic matrix composite materials, can solve the problems of single form of CNTs preform and inability to obtain macro samples for engineering application, and achieves a simple and feasible method and avoids large flexibility. , adjustable wide range of effects

Active Publication Date: 2018-04-06
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to avoid the deficiencies of the prior art, the present invention proposes a method for preparing a carbon nanotube multi-dimensional braided prefabricated ceramic matrix composite material, which overcomes the fact that the existing CNTs composite material CNTs prefabricated body has a single form and cannot obtain macroscopic test materials for engineering applications. to fully explore the mechanical, functional and other characteristics of multi-dimensional CNTs ceramic matrix composites, so that it can gradually enter practical engineering applications from theoretical research

Method used

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  • A preparation method of carbon nanotube multi-dimensional braided prefabricated ceramic matrix composite material
  • A preparation method of carbon nanotube multi-dimensional braided prefabricated ceramic matrix composite material
  • A preparation method of carbon nanotube multi-dimensional braided prefabricated ceramic matrix composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Cut the CNTs film into 10mm narrow strips, and then twist them into fibers with a fiber diameter of 0.7mm.

[0036] (2) Wind the fiber in step (1) on the graphite frame.

[0037] (3) Using CVI process to deposit SiC substrate, process conditions: trichloromethylsilane as source material, argon as diluent gas, argon flow rate 300ml / min, hydrogen as carrier gas, hydrogen flow rate 200ml / min, hydrogen and trichloro The molar ratio of methylsilane is 10:1, the deposition temperature is 1050℃, and the deposition time is 80h to obtain a one-dimensional CNTs / SiC ceramic matrix composite. The tensile strength is tested to be 150Mpa, and the cross-sectional SEM image is shown figure 1 .

Embodiment 2

[0039] (1) Cut the CNTs film into 5mm narrow strips, and then twist them into fibers with a fiber diameter of 0.5mm.

[0040] (2) Wind the fiber in step (1) on the graphite frame.

[0041] (3) The PyC layer was deposited by the CVI process. The process conditions: deposition temperature 960°C, pressure 0.2kPa, propylene flow rate 500m1 / min, Ar gas flow rate 300m1 / min, and deposition time 6h.

[0042] (4) Use the CVI process to deposit the SiC matrix on the material obtained in (3). The process conditions: trichloromethylsilane as the source material, argon as the diluent gas, argon flow rate 350ml / min, hydrogen as carrier gas, hydrogen The flow rate is 250ml / min, the molar ratio of hydrogen to trichloromethylsilane is 10:1, the deposition temperature is 1060℃, and the deposition time is 40h to obtain a one-dimensional CNTs / PyC / SiC ceramic matrix composite. The tensile strength is tested to be 175Mpa , See the SEM picture figure 2 .

Embodiment 3

[0044] (1) Cut the CNTs film into a 5mm wide and narrow strip, wrap it on a graphite frame, and deposit the SiC matrix by the CVI process. The process conditions: trichloromethylsilane as the source material, argon as the dilution gas, and argon flow rate 310ml / min, Hydrogen is the carrier gas, the hydrogen flow rate is 250ml / min, the molar ratio of hydrogen to trichloromethylsilane is 10:1, the deposition temperature is 1000℃, and the deposition time is 30h to obtain the CNTs / SiC preform. The cross-sectional SEM image is shown image 3 .

[0045] (2) Dissolve 0.5 g of sodium carboxymethyl cellulose in 99.5 g of deionized water, and mechanically stir for 1.5 hours at a stirring speed of 600 r / min to obtain a colorless and transparent solution with a certain viscosity.

[0046] (3) Cut the CNTs / SiC composite material obtained in step 1 into a length of 40mm, dip a small amount of the binder solution in step 2, and then arrange them layer by layer, arranging 16 layers, using 1K carbon...

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Abstract

The invention relates to a preparing method for a carbon nano tube multi-dimensional woven preform and ceramic matrix composite.The preparing method includes the steps that CNTs fibers or CNTs paper is deposited to form a PyC interface layer or ceramic matrix of a certain thickness, a perform has certain rigidity and intensity and a low stretch rate, then the CNTs paper is folded, the CNTs fibers are arrayed and laid or woven, and then a CVI technical deposition ceramic matrix is adopted for densification, and preparation of the one-dimension, two-dimension and three-dimension ceramic matrix composites is completed.The method for the CNTs perform is simple and easy to implement, the volume fraction of CNTs is wide in adjustable range, and the prepared composite meets the requirement for practical application.

Description

Technical field [0001] The invention belongs to a method for preparing a ceramic matrix composite material, and specifically relates to a method for preparing a carbon nanotube multi-dimensional braided preform ceramic matrix composite material, in particular to a method for pre-weaving carbon nanotube (CNTs) fibers, films, etc., Then use the chemical vapor deposition (CVI) process to deposit a layer of pyrolytic carbon (PyC) interface layer, and finally use the CVI technology to infiltrate the ceramic matrix to a certain density of ceramic matrix composite materials. Background technique [0002] Advanced ceramic materials such as SiC, Si 3 N 4 , SiCN and other ceramics have the advantages of high temperature resistance, oxidation resistance, abrasion resistance, corrosion resistance, and low density. Therefore, they are often compounded with carbon fibers and silicon carbide fibers and are widely used in high-tech fields such as aerospace and defense equipment. [0003] Currently...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622
CPCC04B35/565C04B35/622C04B35/80C04B2235/422C04B2235/5252C04B2235/614
Inventor 梅辉韩道洋肖珊珊夏俊超成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV