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Preparing method of BCN ceramic fiber

A nano-ceramic fiber and nano-fiber technology, which is applied to the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of complex process and difficulty in direct spinning and forming, and achieve the effect of simple process and easy operation

Active Publication Date: 2019-05-31
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a preparation method of BCN nano-ceramic fiber, which is used to overcome defects such as complicated process and difficulty in direct spinning and forming in the prior art, and realize the preparation of BCN nano-ceramic fiber by template method with simple process, and the prepared BCN nano-ceramic fiber Ceramic fibers can be used as excellent heat insulating materials and absorbing materials

Method used

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  • Preparing method of BCN ceramic fiber
  • Preparing method of BCN ceramic fiber
  • Preparing method of BCN ceramic fiber

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preparation example Construction

[0021] The present invention proposes a preparation method of BCN nano ceramic fiber, please refer to figure 1 , including the following steps:

[0022] S1: Using polyacrylonitrile fibers as nanofiber templates, placing polyacrylonitrile nanofibers in a container, and then replacing the air in the container with an inert atmosphere;

[0023] S2: Using lithium aluminum hydride to reduce the nitrile group to amino group, injecting a tetrahydrofuran solution of lithium aluminum hydride into the container in step S1, after reacting at room temperature, adding ethanol aqueous solution, and removing the liquid in the container;

[0024] S3: Boron nitride is produced by reacting trichloroborazine with amino groups, then injecting trichloroborazine and pyridine into the container in step S2, and reacting at room temperature;

[0025] S4: Obtain the final BCN nano-ceramic fiber through high-temperature treatment, take out the product fiber of step S3, place it in a tube furnace, raise...

Embodiment 1

[0040] The present embodiment provides a kind of preparation method of BCN nano-ceramic fiber, comprises the following steps:

[0041] S1: 30g polyacrylonitrile nanofibers are placed in a sealed glass Erlenmeyer flask, and then the air in the glass container is replaced with nitrogen;

[0042] S2: Inject 120 mL of lithium aluminum hydride tetrahydrofuran solution with a concentration of 0.5 mol / L into the glass container in step S1. The liquid surface is covered with polyacrylonitrile nanofibers. After reacting at room temperature for 3 hours, add 300 mL of 95% ethanol aqueous solution to remove the liquid in the container;

[0043] S3: Inject 0.018mol of trichloroborazine and 300mL of pyridine into the glass container in step S2, and let it stand at room temperature for 3 hours;

[0044] S4: Take out the product fiber of step S3, place it in a tube furnace, maintain a nitrogen flow rate of 50mL / min, raise the temperature to 1300°C at 2°C / min, and then cool down to room tempe...

Embodiment 2

[0049] The present embodiment provides a kind of preparation method of BCN nano-ceramic fiber, comprises the following steps:

[0050] S1: Place 10 g of polyacrylonitrile nanofibers in a sealed glass Erlenmeyer flask, and then replace the air in the glass container with argon;

[0051] S2: Inject 100 mL of lithium aluminum hydride tetrahydrofuran solution with a concentration of 0.5 mol / L into the glass container in step S1, and the liquid surface is covered with polyacrylonitrile nanofibers. After 3 hours of reaction at room temperature, add 100 mL of 95% ethanol aqueous solution to remove the liquid in the container;

[0052] S3: Inject 0.015mol of trichloroborazine and 100mL of pyridine into the glass container in step S2, and let it stand at room temperature for 3 hours;

[0053] S4: Take out the product fiber of step S3, place it in a tube furnace, keep the nitrogen flow rate at 50mL / min, raise the temperature to 1500°C at 5°C / min, and then cool down to room temperature ...

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Abstract

The invention discloses a preparing method of a BCN ceramic fiber. The method includes the steps of firstly, preparing a nanofiber template from polyacrylonitrile fiber; secondly, reducing a nitrile group into an amino group through lithium aluminium hydride; thirdly, making trichloroborazine react with the amino group to produce boron nitride; fourthly, obtaining the final BCN nanometer ceramic fiber through high-temperature processing. Compared with an existing nanofiber ceramic fiber, the preparing method is simple in technological process, no spinning and forming device is needed, and thestrict requirements of synthesizing and spinning of sensitive BCN ceramic precursors for the environment are avoided; meanwhile, the BCN nanometer ceramic fiber has the monofilament diameter of 50-500nm, the density of 0.1-0.2 mg / cm<3>, the heat conductivity of 20-30 W / m K and the dielectric constant of 8-12 and can be used as an excellent heat insulation material and wave absorption material.

Description

technical field [0001] The invention relates to the technical field of nano ceramic fibers, in particular to a preparation method of BCN nano ceramic fibers. Background technique [0002] Ceramic materials are very stable inorganic non-metallic materials, and special properties or functions can be obtained through structural design. Ternary boron carbon nitrogen (BCN) ceramics are mainly composed of three elements: B, C, and N, and usually have a hexagonal and cubic structure similar to BN. Hexagonal BCN has special electrical and thermal conductivity, and generally has semiconductor properties; cubic BCN has High hardness and wear resistance, it is a new type of superhard material. The composition of BCN can be regulated by synthesis method or process, so as to endow this ceramic material with special electrical, optical, thermal and mechanical properties, which can be applied to new high-temperature semiconductors, laser diodes and detectors, photocatalysts, electrode mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10C04B35/58
Inventor 邵长伟纪小宇张帅
Owner NAT UNIV OF DEFENSE TECH
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