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Preparing method for wave-transparent closed-cell beryllium-containing silicon carbide foamed ceramic

A foamed ceramic and silicon carbide technology is applied in the field of preparation of wave-transmitting closed-cell beryllium-containing silicon carbide foamed ceramics, which can solve the problems of limiting the application of foamed ceramic materials, affecting the high-temperature performance of materials, high sintering temperature, etc., and achieving wave-transmitting performance. Excellent, high closed porosity, low sintering temperature

Active Publication Date: 2016-01-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires a high sintering temperature (above 2000°C) and the addition of sintering aids, which affects the high temperature performance of the material and limits the application of foam ceramic materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] step one

[0041] According to the mass ratio, polycarbosilane containing beryllium: polyol = 1:2; prepare polycarbosilane containing beryllium and polyol, and add the polycarbosilane powder prepared to the prepared polycarbosilane powder while stirring. Stir until the beryllium-containing polycarbosilane and polyol are fully mixed and uniform to obtain a mixed solution; the particle size of the beryllium-containing polycarbosilane is about 0.06 mm, and the beryllium-containing polycarbosilane has a mass percentage of 0.2 %; the polyol is polyoxypropylene glycol (its molecular weight is 1500-2000); the catalyst is methylene chloride;

[0042] Step two

[0043] According to the mass ratio, isocyanate: polycarbosilane containing beryllium = 1:1; add isocyanate to the mixed solution obtained in step 1, and stir uniformly to obtain a mixed solution containing isocyanate; the isocyanate is toluene diisocyanate;

[0044] Step three

[0045] Inject the isocyanate-containing mixed solu...

Embodiment 2

[0056] step one

[0057] According to the mass ratio, polycarbosilane containing beryllium: polyol: catalyst = 1:2:1; prepare polycarbosilane containing beryllium, polyol, and catalyst; mix the polyol and catalyst uniformly, and then stir , Adding the prepared beryllium-containing polycarbosilane powder to it until the beryllium-containing polycarbosilane, polyol, and catalyst are fully mixed uniformly to obtain a mixed solution; the particle size of the beryllium-containing polycarbosilane is about 0.05 mm, In the beryllium-containing polycarbosilane, the mass percentage of beryllium is 0.1%; the polyol is polytetrahydrofuran (its molecular weight is 1500-2000), and the catalyst is methylene chloride;

[0058] Step two

[0059] According to the mass ratio, isocyanate: polycarbosilane containing beryllium = 1:2; add isocyanate to the mixed solution obtained in step 1, and stir uniformly to obtain a mixed solution containing isocyanate; the isocyanate is toluene diisocyanate;

[0060]...

Embodiment 3

[0067] step one

[0068] According to the mass ratio, beryllium-containing polycarbosilane: polyol: catalyst = 1:2:0.5; prepare beryllium-containing polycarbosilane, polyol, and catalyst; mix the polyol and catalyst uniformly, and then stir , Adding the prepared beryllium-containing polycarbosilane powder to it until the beryllium-containing polycarbosilane, polyol, and catalyst are fully mixed uniformly to obtain a mixed solution; the particle size of the beryllium-containing polycarbosilane is about 0.05 mm, In the beryllium-containing polycarbosilane, the mass percentage of beryllium is 0.15%; the polyol is polycaprolactone glycol (its molecular weight is 1500-2000), and the catalyst is methylene chloride;

[0069] Step two

[0070] According to the mass ratio, isocyanate: polycarbosilane containing beryllium = 2:1; add isocyanate to the mixed solution obtained in step 1, and stir uniformly to obtain a mixed solution containing isocyanate; the isocyanate is toluene diisocyanate; ...

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PUM

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Abstract

The invention relates to a preparing method for wave-transparent closed-cell beryllium-containing silicon carbide foamed ceramic, and belongs to the field of preparing special functional materials. The preparing method includes the steps that beryllium-containing polycarbosilane powder is used as a precursor of the beryllium-containing silicon carbide foamed ceramic and is evenly mixed with polyalcohol, a catalyst and the like at a certain ratio, then isocyanate is added, the mixture is fully stirred, injected into a mold, foamed and cured at the room temperature, and a finished product is obtained through pre-oxidation and ceramization treatment. The preparing method is simple in process, and the obtained product is high in wave-transparent performance and heat insulation performance and excellent in mechanical property.

Description

Technical field [0001] The invention relates to a preparation method of wave-transmitting closed-cell beryllium-containing silicon carbide foam ceramics, which belongs to the field of preparation of special functional materials. Background technique [0002] Silicon carbide foam ceramics have comprehensive properties such as wave transmission, heat insulation, and excellent mechanical properties. They have been widely used in the aerospace field. Beryllium-containing silicon carbide ceramics doped with beryllium elements have better performance than silicon carbide. The military industry has also received attention. The preparation method of beryllium-containing silicon carbide foam ceramic has an important influence on its performance, and beryllium-containing polycarbosilane can be prepared by high temperature cracking of silicon carbide foam ceramic. [0003] The existing preparation methods of silicon carbide foam ceramics include: [0004] (1) Process of adding pore former. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B38/00
Inventor 黄小忠肖路军杜作娟许慎微
Owner CENT SOUTH UNIV
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