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Submicron ZrC-SiC composite ceramic microsphere and preparation method thereof

A multi-phase ceramic and sub-micron technology, which is applied in the field of sub-micron ZrC-SiC multi-phase ceramic microspheres and preparation, achieves the effects of good fluidity, favorable for mass production and stable preparation process

Active Publication Date: 2022-04-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of submicron ZrC-SiC composite ceramic microspheres with controllable size, good fluidity and uniform phase distribution.

Method used

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  • Submicron ZrC-SiC composite ceramic microsphere and preparation method thereof
  • Submicron ZrC-SiC composite ceramic microsphere and preparation method thereof
  • Submicron ZrC-SiC composite ceramic microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1. Preparation of core-shell structure RF@SiO by template method 2 @ZrO 2 powder

[0041] Step 1.1, prepare phenolic resin (Resorcinol-formaldehyde, RF) microsphere by polycondensation reaction of resorcinol and formaldehyde: 3g resorcinol is dissolved in the mixing that contains 20ml deionized water, 250ml absolute ethanol and 10ml concentrated ammonia water In the solution, after stirring evenly, 4ml of formaldehyde solution was added dropwise, stirred in a water bath at 30°C for 12 hours, centrifuged and dried to obtain monodisperse RF microspheres.

[0042] Step 1.2, preparing silica-coated phenolic resin core-shell structure powder RF@SiO by the Stober method 2 : Put 0.3g of RF microspheres prepared in step 1.1 into a mixed solution containing 20ml of deionized water, 75ml of absolute ethanol, 3ml of ammonia water and 0.6g of cetyltrimethylammonium bromide, ultrasonically disperse, and then drop Add 1 ml of ethyl orthosilicate. Stir in a water bath at 30°C...

Embodiment 2

[0047] Step 1.1, prepare phenolic resin (Resorcinol-formaldehyde, RF) microsphere by polycondensation reaction of resorcinol and formaldehyde: 3g resorcinol is dissolved in the mixing that contains 20ml deionized water, 250ml absolute ethanol and 10ml concentrated ammonia water In the solution, after stirring evenly, 4ml of formaldehyde solution was added dropwise, stirred in a water bath at 30°C for 12 hours, centrifuged and dried to obtain monodisperse RF microspheres.

[0048] Step 1.2, prepare silica-coated phenolic resin core-shell structure powder RF@SiO2 by the Stober method: put 0.3g of RF microspheres prepared in step 1.1 into a solution containing 20ml of deionized water, 75ml of absolute ethanol, and 3ml of ammonia water And in the mixed solution of 0.6g cetyltrimethylammonium bromide, after ultrasonic dispersion, 1ml tetraethyl orthosilicate was added dropwise. Stir in a water bath at 30°C for 20 hours, centrifuge and dry to obtain RF@SiO 2 Powder.

[0049] Step ...

Embodiment 3

[0053] Step 1.1, prepare phenolic resin (Resorcinol-formaldehyde, RF) microsphere by polycondensation reaction of resorcinol and formaldehyde: 4g resorcinol is dissolved in the mixing that contains 20ml deionized water, 250ml absolute ethanol and 10ml concentrated ammonia water In the solution, after stirring evenly, 6ml of formaldehyde solution was added dropwise, stirred in a water bath at 30°C for 12 hours, centrifuged and dried to obtain monodisperse RF microspheres.

[0054] Step 1.2, preparing silica-coated phenolic resin core-shell structure powder RF@SiO by the Stober method 2 : Put 0.3g of RF microspheres prepared in step 1.1 into a mixed solution containing 20ml of deionized water, 75ml of absolute ethanol, 3ml of ammonia water and 0.6g of cetyltrimethylammonium bromide, ultrasonically disperse, and then drop Add 1 ml of ethyl orthosilicate. Stir in a water bath at 30°C for 24 hours, centrifuge and dry to obtain RF@SiO 2 Powder.

[0055] Step 1.3, 0.20g of RF@SiO ...

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Abstract

The invention relates to a submicron ZrC-SiC composite ceramic microsphere and a preparation method thereof. The preparation method adopts a template method combined with a carbon thermal reduction reaction. The preparation method is technically characterized by comprising the following steps: taking phenolic resin (RF) microspheres synthesized by polycondensation of resorcinol and formaldehyde as a template; synthesizing RF (at) SiO2 (at) ZrO2 core-shell structure powder by taking the submicron resin microspheres synthesized in the step 1 as a core, taking silicon dioxide (SiO2) synthesized by a stober method as a first layer shell and taking zirconium oxide (ZrO2) prepared by hydrolyzing zirconium n-butoxide as a second layer shell; the powder prepared in the step 2 is subjected to a carbon thermal reduction reaction at a certain temperature, and the ZrC-SiC composite ceramic microspheres are obtained. According to the technical scheme provided by the invention, the submicron ZrC-SiC composite ceramic microspheres with controllable and uniform particle size, good fluidity and uniform microstructure and morphology can be prepared. The developed preparation process is stable, high in repeatability and low in cost, and batch production of the ZrC-SiC composite ceramic microspheres is facilitated.

Description

technical field [0001] The invention belongs to the technical field of preparation of new materials, and relates to a submicron ZrC-SiC composite ceramic microsphere and a preparation method thereof. Background technique [0002] With the continuous innovation of science and technology, the aircraft is developing towards high speed and long endurance, and the radar detection technology is also constantly updated. This makes the aircraft face two severe challenges: one is that the aircraft is in an extremely harsh aerodynamic heating environment under high Mach number flight conditions, and the service conditions of the thermal protection materials on the outer wall of the aircraft are very harsh. Among them, the temperature of key thermal components such as the nose cone and wing leading edge of the aircraft will exceed 2000°C, and traditional thermal protection materials will hardly meet the needs of use; the second is that the aircraft must have electromagnetic stealth fun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/565C04B35/626C04B35/66
CPCC04B35/5622C04B35/565C04B35/62695C04B35/66C04B2235/5445C04B2235/5454
Inventor 成来飞叶昉赵凯崔雪峰张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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