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Pyramidal silicon carbide ceramic absorber and preparation method thereof

A technology of conical silicon carbide and absorber, applied in the field of functional materials, to achieve the effects of improved electrical performance, large economic value, and high absorption rate

Active Publication Date: 2017-01-04
NANJING LUOPU TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

General absorbers such as polyurethane will lose carbon powder and it is difficult to meet the requirements, while silicon carbide ceramic absorbers can meet the requirements

Method used

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  • Pyramidal silicon carbide ceramic absorber and preparation method thereof
  • Pyramidal silicon carbide ceramic absorber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation and performance test of a tapered silicon carbide ceramic absorber.

[0037] a) Weigh various components according to the following weight percentages: 55% SiC, 7% SiO 2 , 18% MgO, 3% BaCO 3 , 0.5% MnO 2 , 0.8% CoO, 1% V 2 O 5 , 1.2% Al 2 O 3 , 10% semi-refined paraffin, 3.5% low-density polyethylene particles, and mix the above components in a mixer at a temperature of 100°C, a rotation speed of 30 rpm, and a time of 3 hours. When the material is discharged, it is a block with uniform color;

[0038] b) placing the mixture obtained in step a) in a pulverizer to obtain pellets with a particle size of 2 to 4 mm;

[0039] c) Place the pellets obtained in step b) in the barrel of the injection molding machine for injection molding, the injection temperature is 150° C., the molding pressure is 10 MPa, and the green body is demolded and cooled to room temperature to obtain a ceramic green body;

[0040] d) Put the ceramic green body obtained in step c) in a ga...

Embodiment 2

[0044] Example 2: Preparation and performance test of a tapered silicon carbide ceramic absorber.

[0045] a) Weigh various components according to the following weight percentages: 60% SiC, 5% SiO 2 , 15% MgO, 3% BaCO 3 , 0.5% MnO 2 , 0.8% CoO, 1% V 2 O 5 , 1.2% Al 2 O 3 , 10% semi-refined paraffin, 3.5% low-density polyethylene particles, and mix the above components in a mixer at a temperature of 100°C, a rotation speed of 30 rpm, and a time of 2 hours. When the material is discharged, it is a block with uniform color;

[0046] b) Place the block obtained in step a) in a pulverizer to obtain granular material with a particle size of 2 to 4 mm;

[0047] c) placing the pellets obtained in step b) in the barrel of an injection molding machine for injection molding, the injection molding machine has an injection temperature of 150° C., a molding pressure of 10 MPa, and the green body is demolded and cooled to room temperature to obtain a ceramic green body;

[0048] d) Put the ceramic ...

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Abstract

The invention discloses a pyramidal silicon carbide ceramic absorber and a preparation method thereof. Particularly, the pyramidal silicon carbide ceramic absorber is prepared from the following components in percentage by weight: 40-60% of SiC, 5-15% of SiO2, 15-20% of MgO, 0-10% of BaCO3, 0-3% of MnO2, 0-2% of CoO, 0-2% of V2O5, 0-2% of Al2O3, 5-10% of semi-refined paraffin wax and 1-5% of PE (polyethylene) plasticizer. The preparation method comprises the following components: carrying out high-temperature compounding, carrying out injection molding to obtain pyramids, degreasing and sintering to obtain the final product. The pyramidal ceramic absorber with broadband absorption property prepared by the injection molding process has the characteristics of simple technique, stable properties, favorable heat conductivity coefficient, high hemispherical emittance, high vacuum applicability and the like.

Description

Technical field [0001] The invention belongs to the technical field of functional materials, and specifically relates to a tapered silicon carbide ceramic absorber and a preparation method thereof. Background technique [0002] As a high-temperature dielectric absorbent, silicon carbide material has been researched and applied for many years. It is mainly used in wave-absorbing coatings, regular-shaped loads, etc., but it is rarely used as a broadband absorption component (such as a quadrangular pyramid absorber) at home and abroad. the study. With the development of radar antenna technology and electronic measurement technology, the demand for absorbing components with large bandwidth and capable of withstanding high power is increasing day by day. [0003] The absorbing box is proposed based on modern antenna testing technology. It is a small microwave anechoic chamber, which also has the shielding and absorbing performance required by the anechoic chamber. The general absorbin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/64
CPCC04B35/565C04B35/64C04B2235/3206C04B2235/3215C04B2235/3217C04B2235/3239C04B2235/3267C04B2235/3275C04B2235/3418C04B2235/6562C04B2235/6567
Inventor 金宇龙董胜奎翁浙巍沈小兵
Owner NANJING LUOPU TECH CO LTD
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