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a kind of sic f Preparation method of @bn core-shell structure chopped fiber

A technology of chopped fiber and core-shell structure, which is applied in the field of preparation of SiCf@BN core-shell structure chopped fiber, can solve the problems of weak absorbing performance, achieve low cost, simple operation, and increase the effect of phase interface area

Active Publication Date: 2021-11-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a SiC f Preparation method of @BN core-shell structured chopped fibers

Method used

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  • a kind of sic <sub>f</sub> Preparation method of @bn core-shell structure chopped fiber
  • a kind of sic <sub>f</sub> Preparation method of @bn core-shell structure chopped fiber
  • a kind of sic <sub>f</sub> Preparation method of @bn core-shell structure chopped fiber

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specific Embodiment approach 1

[0018] Specific implementation mode 1: a SiC in this implementation mode f The preparation method of @BN core-shell structure chopped fibers is completed in the following steps:

[0019] 1. Pretreatment: Weigh silicon carbide chopped fibers, add them to alkaline solution, stir and wash at 20°C to 80°C, filter with suction, wash with distilled water until neutral, transfer to HF solution, stir and wash, and filter with suction 1. After washing with distilled water until neutral, then washing in HCl solution, then suction filtration, washing with distilled water until neutral, and then drying at 20°C to 160°C to obtain pretreated silicon carbide chopped fibers;

[0020] 2. Impregnation: Weigh the boron source and nitrogen source, add them to solvent A, ultrasonicate for 5min~60min to obtain the impregnating solution, immerse the pretreated silicon carbide chopped fibers into the impregnating solution, ultrasonicate for 3min~10min, and then let stand impregnation, suction filtra...

specific Embodiment approach 2

[0024] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the alkali solution in step one is the NaOH solution of concentration 3.75mol / L, the mass volume ratio of silicon carbide chopped fiber and alkali solution is 1g:(250~ 500) mL, the washing time of silicon carbide chopped fibers in alkaline solution is 0.5~3h. Others are the same as the first embodiment.

specific Embodiment approach 3

[0025] Specific embodiment three: what this embodiment is different from specific embodiment one or two is: the concentration of HF solution is 2.5mol / L in step one, the mass volume ratio of silicon carbide chopped fiber and HF solution is 1g:(250~ 500) mL, the washing time of silicon carbide chopped fibers in HF solution is 0.5~3h. Others are the same as those in Embodiment 1 or 2.

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Abstract

A SiC f The preparation method of @BN core-shell structure chopped fibers, specifically involving a kind of SiC f Preparation method of @BN core-shell structured chopped fibers. It belongs to the fields of aerospace, microwave absorption, environmental protection, catalysis, biosensing, semiconductor materials, energy and nuclear protection materials preparation. The purpose of the present invention is to solve the problem of weak microwave absorption of traditional silicon carbide chopped fibers. The preparation method: 1. pretreatment; 2. impregnation; 3. roasting; 4. repeated roasting to obtain SiC with a BN shell f @BN. Advantages: 1. Low cost and simple operation; 2. The thickness of the BN shell can be adjusted; 3. Excellent wave-absorbing performance. The invention is applied to SiC with core-shell structure f @BN's field of preparation.

Description

technical field [0001] The present invention relates to a SiC f Preparation method of @BN core-shell structured chopped fibers. Background technique [0002] As a material with great application potential in absorbing waves, silicon carbide chopped fibers (SiC f ) itself has a certain wave-absorbing performance, can absorb electromagnetic waves to a certain extent, and reduces the occurrence of problems such as electromagnetic radiation pollution and information leakage, and has broad application prospects in both civilian and military fields. At the same time, SiC f It has the characteristics of low density, stable chemical properties and excellent thermal stability, which can meet the application requirements under some extreme conditions. However, in the frequency range of 2GHz to 18GHz for SiC f The microwave absorption performance test was carried out, and the results showed that SiC f The achievable reflection loss value (RL) is only -16.433dB. Although it is less...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C09K3/00
CPCC04B35/565C04B35/62868C04B2235/5244C09K3/00
Inventor 王志江赵海瑞
Owner HARBIN INST OF TECH