Preparation method of silicon carbide/carbon hollow porous microsphere wave-absorbing material

A technology of porous microspheres and wave-absorbing materials, applied in the field of wave-absorbing materials, can solve the problems of large particle size and easy agglomeration of silicon carbide particles, and achieve the effects of small size, uniform dispersion and uniformity guarantee.

Active Publication Date: 2020-02-21
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problem of large silicon carbide particle size and easy agglomeration in the preparation of silicon carbide / carbon composite materials by the existing method, and provides a preparation method of silicon carbide / carbon hollow porous microsphere wave-absorbing material

Method used

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  • Preparation method of silicon carbide/carbon hollow porous microsphere wave-absorbing material
  • Preparation method of silicon carbide/carbon hollow porous microsphere wave-absorbing material
  • Preparation method of silicon carbide/carbon hollow porous microsphere wave-absorbing material

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specific Embodiment approach 1

[0031] Specific implementation mode 1: In this implementation mode, a method for preparing a silicon carbide / carbon hollow porous microsphere microwave-absorbing material is specifically carried out according to the following steps:

[0032] 1. Mix deionized water, absolute ethanol and ammonia water, then add surfactant, stir to dissolve, then add resorcinol and stir to dissolve, then add silicon source and formaldehyde solution and stir at room temperature, then add melamine, at room temperature Stir to obtain a mixture;

[0033] 2. Transfer the mixture obtained in step 1 to a high-temperature and high-pressure reactor for reaction, then centrifuge, wash, dry, and perform high-temperature calcination under a nitrogen atmosphere to obtain a silica / carbon composite powder;

[0034] 3. Mix and grind the silicon dioxide / carbon composite powder and magnesium powder obtained in step 2 evenly, transfer to a tube furnace, perform high-temperature calcination under nitrogen atmosphere...

specific Embodiment approach 2

[0035] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the volume ratio of deionized water, absolute ethanol and ammonia water in step 1 is 500:200:3. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass fraction of ammonia water in step 1 is 25%. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to the technical field of wave-absorbing materials, in particular to a preparation method of a silicon carbide / carbon hollow porous microsphere wave-absorbing material. The invention aims to solve the technical problems of large particle size and easy agglomeration of silicon carbide particles in the silicon carbide / carbon composite material prepared by the existing method. The method includes: mixing deionized water, anhydrous ethanol and ammonia water, adding a surfactant, resorcinol, a silicon source and a formaldehyde solution, stirring the substances uniformly at room temperature, then adding melamine, performing stirring, transferring the mixture into a high-temperature and high-pressure reactor for reaction, and conducting high temperature calcination; and thenperforming mixing with magnesium powder, conducting high temperature calcination in a nitrogen atmosphere, washing off redundant magnesium powder with hydrochloric acid, and carrying out washing anddrying. The silicon carbide / carbon hollow porous microsphere obtained by the method has good chemical homogeneity and large specific surface area, and can effectively avoid agglomeration and sinteringof silicon carbide particles. The material prepared by the method provided by the invention is used for making light and efficient wave-absorbing coatings.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a method for preparing a silicon carbide / carbon hollow porous microsphere wave-absorbing material. Background technique [0002] The development of information technology, especially the use of some new multi-band and high-power electronic instruments, has produced excessive electromagnetic radiation and caused serious electromagnetic pollution. Electromagnetic pollution not only interferes with the operation of some precision instruments, but also causes harm to biological systems. In order to protect instruments and organisms from electromagnetic pollution, electromagnetic shielding materials are often used. Although electromagnetic shielding materials can play a protective role to a certain extent, electromagnetic shielding cannot eliminate electromagnetic waves, and it is easy to cause secondary pollution. . Unlike electromagnetic shielding materials, wave-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00Y02E60/10
Inventor 杜耘辰王亚辉韩喜江
Owner HARBIN INST OF TECH
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