Microwave absorbing composite material with silicon carbide-carbon and preparation process thereof

A composite material and microwave absorption technology, applied in the field of ceramic matrix composite materials, can solve problems such as complex process, high density, and limited application range, and achieve the effects of low preparation cost, good high temperature performance, and wide application range

Inactive Publication Date: 2006-06-28
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

The above-mentioned electrical loss materials have poor microwave absorption performance, and they all need to be controlled by composition and process to obtain better microwave absorption performance.
Taking silicon carbide materials as an example, as reported in the literature [Luo Fa, Zhou Wancheng, Jiao Heng, Zhao Donglin. "Research Status of High-temperature Absorbing Materials." Aerospace Materials Technology. 2000. (1). 8-11] Japan uses the method of purification , to obtain silicon carbide raw materials with extremely high purity and almost no impurities. This material has a wide absorbing frequency band and absorbing performance, but the method is extremely complicated and the manufacturing cost is high
For silicon carbide fibers, as reported in the literature [Song Yongcai, Lu Yi, Feng Chunxiang. "Res

Method used

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  • Microwave absorbing composite material with silicon carbide-carbon and preparation process thereof

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Experimental program
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Effect test

Embodiment 1

[0026] The process steps are:

[0027] (1) The matrix powder is selected as D 50 = 0.2-2μm β-SiC particle powder, its purity should be greater than 95wt%, and D 50 =0.5-5μm graphite C particle powder, and add 0.5-2wt% sintering aid. such as BAC or Al 2 o 3 , the addition amount is 0.5-2wt% of the silicon carbide-carbon matrix, that is, an additional row λ plus λ. Wherein the content of C or graphite is 1-20wt% of the total content of the composite powder.

[0028] (2) After mixing the prepared powder on a ball mill with alcohol as a solvent for 24 hours, add 5-15vol% phenolic resin solution as a binder, and after mixing for another 5 hours, take it out, dry it, grind it, and pass it through 60 mesh Sieve and set aside.

[0029] (3) The composite powder is pressed and formed on a flat vulcanizing machine, the forming pressure is about 20MPa, the pressure is kept for 20s, and sintered at 1800-2250°C under the protection of Ar in a high-temperature sintering furnace.

[00...

Embodiment 2

[0035] Adopt hot pressing mode to carry out sintering, and sintering temperature is 1700-2050 ℃, and pressure is 20-40MPa, and other is as embodiment 1, and its microwave performance is as follows: figure 1 shown.

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Abstract

The invention relates to a microwave absorbing compounding material that uses silicon carbide as basal material, and the manufacture method. The technology is that: adopting silicon carbide powder that has the diameter of 0.1-10um, graphite C power that has the diameter of 0.1-10um. After molding, the compounding material is sintered at 1700-2250 degree centigrade. The feature is that the density range is 1.6-3.2cm3, resistivity range is 100-104.cm, the real part of dielectric constant is 1-200. The material is machined to sectional area of 22.86*10.16mm2, and the thickness at 4, 8, 12mm, the microwave maximum of attenuation value of the X wave section at 8-12.4GHz is -40db, and the attenuation values in the whole X section are all above -20db.

Description

Technical field: [0001] The present invention relates to a silicon carbide-carbon microwave absorbing composite material and its preparation method, more precisely, it is a composite material with excellent microwave absorbing properties obtained through composition control and process change using silicon carbide and carbon as matrix materials. Materials and their preparation methods. It belongs to the field of ceramic matrix composite materials. Background technique: [0002] Due to its good semiconductor characteristics and other comprehensive properties, silicon carbide ceramics are regarded as a very promising absorbing material. At present, the research in this area is mainly focused on the structural absorbing material with silicon carbide fiber as the absorbent, but due to the expensive price of silicon carbide fiber and the complicated preparation process, the manufacturing cost of this kind of material is high, and it is difficult to obtain a wide range of materia...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
Inventor 谭寿洪周泽华江东亮
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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