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A kind of boron carbide/silicon carbide ceramic hollow microsphere and preparation method thereof

A technology of silicon carbide ceramics and hollow microspheres, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of high cost, high preparation difficulty, poor controllability, etc., and achieves high density and simple and convenient preparation method. , the effect of improving compatibility

Active Publication Date: 2022-05-24
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides boron carbide / silicon carbide ceramic hollow microspheres and a preparation method thereof, which are used to overcome the high cost, complicated and lengthy process, high preparation difficulty, poor controllability, and the need to customize special instruments and equipment in the prior art, and prepare It is difficult for hollow microspheres to break through defects such as 20μm wall thickness

Method used

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  • A kind of boron carbide/silicon carbide ceramic hollow microsphere and preparation method thereof
  • A kind of boron carbide/silicon carbide ceramic hollow microsphere and preparation method thereof
  • A kind of boron carbide/silicon carbide ceramic hollow microsphere and preparation method thereof

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preparation example Construction

[0024] The present invention provides a method for preparing boron carbide / silicon carbide ceramic hollow microspheres, comprising:

[0025] S1: Disperse the boron carbide powder in an ethanol aqueous solution containing a vinyl silane coupling agent, adjust it to acidity with glacial acetic acid, stir at room temperature to fully hydrolyze the vinyl silane coupling agent, stand for stratification, and separate the solid phase Filter and wash with ethanol, dry, grind and sieve to obtain vinyl-modified boron carbide powder;

[0026] S2: Disperse the vinyl-modified boron carbide powder in a benzene solution of PCS, heat up to 50-80° C., add a platinum-containing catalyst, and react at a constant temperature for 12-36 hours, then filter, and the obtained solid phase is subjected to benzene-based solution. After flux washing, dry grinding and sieving to obtain PCS-grafted boron carbide powder;

[0027] S3: take the PCS-grafted boron carbide powder as a solid phase, take PCS (poly...

Embodiment 1

[0075] This embodiment provides a boron carbide / silicon carbide ceramic hollow microsphere with a diameter of about 1.7 mm and a wall thickness of about 30-40 μm.

[0076] This embodiment also provides a method for preparing boron carbide / silicon carbide ceramic hollow microspheres as described above, comprising the following steps:

[0077] The first step, vinyl modification of boron carbide powder:

[0078] 1. Disperse 20 grams of micron-grade high-purity boron carbide powder (particle size 1-3 microns) in 50 ml of 50vt% ethanol deionized aqueous solution, stir magnetically for 30 minutes, and then ultrasonically disperse for 30 minutes.

[0079] 2. Add 9 ml of trimethoxyvinylsilane, stir magnetically for 30 minutes, and then ultrasonically disperse for 30 minutes.

[0080] 3. Under the condition of magnetic stirring, add glacial acetic acid dropwise to the mixture until the pH value of the mixture reaches 2-4, and keep stirring at room temperature for 20h.

[0081] 4. Ful...

Embodiment 2

[0101] This embodiment provides a boron carbide / silicon carbide ceramic hollow microsphere with a diameter of about 2.1-2.2 mm and a wall thickness of about 60-120 μm.

[0102] This embodiment also provides a method for preparing boron carbide / silicon carbide ceramic hollow microspheres as described above, comprising the following steps:

[0103] The first step, vinyl modification of boron carbide powder: same as Example 1.

[0104] The second step, polycarbosilane graft modification of boron carbide powder: same as Example 1.

[0105] The third step, the preparation of modified boron carbide powder slurry:

[0106] 1. Take 1.5 grams of B 4 C-PCS, 3 mL xylene, 0.4 g PCS (softening point 230°C) in a small glass vial.

[0107] 2. Magnetic stirring for 30 minutes, and then ultrasonically dispersing for 30 minutes, keep stirring continuously at a stirring rate of 400 r / min to obtain boron carbide powder slurry (B 4 C-P0.4 slurry).

[0108] The fourth step, coating the modifie...

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Abstract

The invention discloses a boron carbide / silicon carbide ceramic hollow microsphere and a preparation method thereof. The preparation method utilizes a vinyl silane coupling agent to modify boron carbide, and then grafts PCS to B 4 on C‑V, then B 4 C-PCS is prepared into a slurry, and the polymer ball is used as a template to prepare a slurry coating ball, and finally the slurry on the polymer ball is cured in an air atmosphere, and then heat-treated in an air atmosphere to remove polymerization. Object spherical template, and finally fired at high temperature in an inert atmosphere to obtain boron carbide / silicon carbide ceramic hollow microspheres. The preparation method provided by the present invention can adjust the diameter of boron carbide / silicon carbide ceramic hollow microspheres by selecting polymer spheres with different diameters, and realize a wide range of diameter control, and the wall thickness of ceramic hollow microspheres can be changed by changing the slurry coating. The thickness of the wall can be adjusted in a wide range by adjusting the number of coating times. The preparation method is simple, convenient, fast and efficient, and the raw materials are cheap and easy to obtain, which has the potential for industrial production.

Description

technical field [0001] The invention relates to the technical field of ceramic hollow microspheres, in particular to a boron carbide / silicon carbide ceramic hollow microsphere and a preparation method thereof. Background technique [0002] Laser inertial confinement fusion (LICF) is an important way to achieve controllable nuclear fusion, and it is an emerging energy that is expected to completely solve the human energy crisis. LICF uses target pellets as a container for filling nuclear fusion fuel and an important structure for initiating thermonuclear fusion, and its development technology is an important key technology to realize the practical application of LICF. The theoretical models of LICF research institutions at home and abroad have undergone a lot of simulation and screening, and it is unanimously believed that boron carbide is one of the best materials for LICF target pellet shells. At present, the main methods for preparing boron carbide hollow microspheres are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/563C04B35/571C04B35/628
CPCC04B38/009C04B35/563C04B35/571C04B35/62834
Inventor 苟燕子闫德轩邵长伟王小宙龙鑫
Owner NAT UNIV OF DEFENSE TECH
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