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An in situ growth of Si inside 2D carbon felt 3 no 4 nanowire approach

An in-situ growth, nanowire technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem of inability to grow uniform carbon felt, achieve controllable distribution density, overcome poor permeability, and improve the enhancement effect. Effect

Active Publication Date: 2017-04-05
无锡博智复合材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Document 2 "Li K, Zhao K, Wang Y. In-situ synthesis and growth mechanism of silicon nitride nanowires on carbon fiber fabrics [J]. Ceramics International, 2014, 40:15381–15389." In situ synthesis of Si on the outer surface 3 N 4 nanowire method, but using the process parameters and methods provided in the literature, it is impossible to grow uniform Si inside the carbon felt 3 N 4 Nanowires

Method used

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  • An in situ growth of Si inside 2D carbon felt <sub>3</sub> no <sub>4</sub> nanowire approach
  • An in situ growth of Si inside 2D carbon felt <sub>3</sub> no <sub>4</sub> nanowire approach
  • An in situ growth of Si inside 2D carbon felt <sub>3</sub> no <sub>4</sub> nanowire approach

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Experimental program
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Effect test

Embodiment 1

[0026] 1) Set the density to 0.2g / cm 3 The 2D carbon felt is processed into a cuboid with a size of 40mm×30mm×10mm, and ultrasonically cleaned twice in alcohol solution, each time for 15min;

[0027] 2) Load ferrocene catalyst in 2D carbon felt: impregnate the carbon felt with xylene supersaturated solution of ferrocene (mass fraction of ferrocene is about 15%) for 1 h, take it out and dry it in a drying oven;

[0028] 3) Dilute polysilazane with xylene: prepare a mixed solution of polysilazane and xylene with a volume fraction of polysilazane of 10%, and stir it magnetically for 1 hour;

[0029] 4) Immerse the carbon felt prepared in step 2 in the mixed solution of step 3, and quickly put it into a vacuum impregnation box for immersion until the xylene in the mixed solution is blotted dry;

[0030] 5) Put the carbon felt in step 4 into a horizontal tube furnace for heat treatment: raise the temperature from room temperature to 1450°C at a rate of 6°C / min, keep it warm for 4 ...

Embodiment 2

[0032] 1) Set the density to 0.48g / cm 3 The 2D carbon felt is processed into a cuboid with a size of 40mm×30mm×10mm, and ultrasonically cleaned twice in alcohol solution, each time for 15min;

[0033] 2) Load ferrocene catalyst in 2D carbon felt: impregnate the carbon felt with xylene supersaturated solution of ferrocene (mass fraction of ferrocene is about 15%) for 1 h, take it out and dry it in a drying oven;

[0034] 3) Diluting polysilazane with xylene: prepare a mixed solution of polysilazane and xylene with a volume fraction of polysilazane of 15%, and magnetically stir for 1 hour;

[0035] 4) Immerse the carbon felt prepared in step 2 in the mixed solution of step 3, and quickly put it into a vacuum impregnation box for immersion until the xylene in the mixed solution is blotted dry;

[0036]5) Put the carbon felt in step 4 into a horizontal tube furnace for heat treatment: raise the temperature from room temperature to 1550°C at a rate of 6°C / min, keep it warm for 5 h...

Embodiment 3

[0038] 1) Set the density to 0.45g / cm 3 The 2D carbon felt is processed into a cuboid with a size of 40mm×30mm×10mm, and ultrasonically cleaned twice in alcohol solution, each time for 15min;

[0039] 2) Loading the ferrocene catalyst in the 2D carbon felt: impregnate the carbon felt with a xylene supersaturated solution of ferrocene (the mass fraction of ferrocene is about 15%) for 1 hour, take it out and dry it in a drying oven;

[0040] 3) Dilute polysilazane with xylene: prepare a mixed solution of polysilazane and xylene with a volume fraction of polysilazane of 18%, and magnetically stir for 1 hour;

[0041] 4) Immerse the carbon felt prepared in step 2 in the mixed solution of step 3, and quickly put it into a vacuum impregnation box for immersion until the xylene in the mixed solution is blotted dry;

[0042] Put the carbon felt in step 4 into a horizontal tube furnace for heat treatment: raise the temperature from room temperature to 1650°C at a rate of 6°C / min, keep...

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Abstract

The invention relates to a method of in-situ growth of Si3N4 nanowires in a 2D carbon felt. By adopting the precursor steeping-pyrolysis method, Si3N4 nanowires grow in situ in the carbon felt, so that the problem that conventional CVD method is poor in permeability in a porous preform with large thickness and high density is solved, and the situation that Si3N4 nanowires uniformly grow in the overall preform from inside to surface is achieved; in the method, the compositional ratio of a precursor, the steeping method and the heat treatment process have great influences on test results; through adjusting experiment parameters, uniformly distributed Si3N4 nanowires can be obtained in the carbon felt, and enhancement effect improvement of the 2D carbon felt in multidimensional scaling is facilitated; according to the method, the distribution density of the Si3N4 nanowires in the carbon felt can be controlled, and the defect that the conventional CVD method is poor in permeability in the nanowires growing in the carbon felt is overcome; the method has the advantages of being low in cost, short in circle and easy to achieve large-scale and efficient production.

Description

technical field [0001] The present invention belongs to in-situ growth Si 3 N 4 Nanowire method, specifically involving an in situ growth of Si inside 2D carbon felt 3 N 4 nanowire method. Background technique [0002] In recent years, the rapid development of my country's aerospace and national defense technology, such as a new generation of aero-engines, aerospace vehicles, etc., has put forward increasingly stringent requirements for the structure and performance of C / C composite materials, especially for thin-walled, sharp The need for sharp and complex integral components is more urgent. However, since the commonly used 2D C / C composite material is a typical layered composite material, its tensile properties in the Z direction (stack direction), compression resistance in the layer direction, and shear resistance between layers are not ideal. During the forming process of multi-directional braided C / C composites, because the fibers at the edges and surfaces are cut, ...

Claims

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Application Information

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IPC IPC(8): C01B21/068C04B35/83B82Y30/00
Inventor 卢锦花郭科兵宋强李伟李贺军
Owner 无锡博智复合材料有限公司
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