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A preparation method of wave-transparent closed-cell silicon carbide foam ceramics containing beryllium

A foamed ceramic and silicon carbide technology, which is applied in the field of preparation of wave-transmitting closed-cell beryllium-containing silicon carbide foamed ceramics, can solve the problems affecting the high-temperature properties of materials, high sintering temperature, and restrict the application of foamed ceramic materials, and achieves a closed-cell ratio. High, low sintering temperature, excellent wave transmittance

Active Publication Date: 2017-10-13
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, beryllium-containing polycarbosilane: polyol = 1:2; prepare beryllium-containing polycarbosilane and polyol, and add the prepared beryllium-containing polycarbosilane powder to the prepared polyol in a stirring state Stir until the beryllium-containing polycarbosilane and polyalcohol are fully mixed to obtain a mixed solution; the particle diameter of the beryllium-containing polycarbosilane is about 0.06 mm, and in the beryllium-containing polycarbosilane, the mass percentage of beryllium is 0.2 %; the polyol is polyoxypropylene diol (its molecular weight is 1500-2000); the catalyst is methylene dichloride;

[0042] step two

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

[0044] step three

[0045] Inject the iso...

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; , adding the beryllium-containing polycarbosilane powder into it, until the beryllium-containing polycarbosilane, polyhydric alcohol, and catalyst are fully mixed to obtain a mixed solution; the particle diameter of the beryllium-containing polycarbosilane is about 0.05 mm, and the In polycarbosilane containing beryllium, the mass percentage of beryllium is 0.1%; the polyol is polytetrahydrofuran (its molecular weight is 1500-2000), and the catalyst is dichloromethane;

[0058] step two

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

[0060] step three

[0061] Inject the mixed...

Embodiment 3

[0067] step one

[0068] According to the mass ratio, polycarbosilane containing beryllium: polyol: catalyst = 1:2:0.5; prepare polycarbosilane containing beryllium, polyol and catalyst; , adding the beryllium-containing polycarbosilane powder into it, until the beryllium-containing polycarbosilane, polyhydric alcohol, and catalyst are fully mixed to obtain a mixed solution; the particle diameter of the beryllium-containing polycarbosilane is about 0.05 mm, and the In polycarbosilane containing beryllium, the mass percentage of beryllium is 0.15%; the polyol is polycaprolactone diol (its molecular weight is 1500-2000), and the catalyst is methylene chloride;

[0069] step two

[0070] According to the mass ratio, isocyanate: beryllium-containing polycarbosilane=2:1; isocyanate is added to the mixed solution obtained in step 1, and stirred evenly to obtain a mixed solution containing isocyanate; the isocyanate is toluene diisocyanate;

[0071] step three

[0072] Inject the ...

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Abstract

The invention relates to a preparation method of a wave-transmitting closed-cell beryllium-containing silicon carbide foam ceramic, which belongs to the field of preparation of special functional materials. In the present invention, the beryllium-containing polycarbosilane powder is used as the beryllium-containing silicon carbide foam ceramic precursor, and the polyol, catalyst, etc. are mixed uniformly in a certain proportion, and then isocyanate is added. After fully stirring, it is injected into the mold. After foaming and curing, the finished product is obtained by pre-oxidation treatment and ceramicization treatment. The preparation process of the invention is simple, and the obtained product has good wave transmission, high heat insulation and excellent mechanical properties.

Description

technical field [0001] The invention relates to a method for preparing wave-transparent closed-cell silicon carbide foam ceramics containing beryllium, which belongs to the field of preparation of special functional materials. Background technique [0002] Silicon carbide foam ceramics has comprehensive properties such as wave penetration, heat insulation, and excellent mechanical properties, and has been widely used in the aerospace field, while 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 ceramics has an important impact on its properties, and beryllium-containing polycarbosilane can be prepared by pyrolysis of silicon carbide foam ceramics. [0003] The preparation method of existing silicon carbide foam ceramics has: [0004] (1) Adding pore-forming agent process. The disadva...

Claims

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Application Information

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Patent Type & Authority Patents(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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