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Preparation method of wave-absorbing composite material used for isolator loading

A composite material and isolator technology, which is applied in the field of preparation of wave-absorbing composite materials for isolator loads, can solve the problem that absorption performance and withstand power cannot be both at the same time, and cannot meet the development requirements of isolator miniaturization and high power. Problems such as low heat distortion temperature, to achieve the effect of good microwave absorption performance

Inactive Publication Date: 2012-02-15
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The absorbing performance and the withstand power cannot have high indicators at the same time, and cannot meet the development requirements of the miniaturization and high power of the isolator;
[0004] 2) The thermal deformation temperature of the absorbing material is too low
If the absorber in the device softens and deforms below 150°C, the performance of the device will change after returning to normal temperature, which will bring great trouble to the debugging of the device

Method used

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  • Preparation method of wave-absorbing composite material used for isolator loading
  • Preparation method of wave-absorbing composite material used for isolator loading
  • Preparation method of wave-absorbing composite material used for isolator loading

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Main ingredients: mass ratio (carbonyl iron powder): (epoxy resin E51) = 7:1

[0045] Mix 70g of carbonyl iron powder and 14g of absolute ethanol in a three-necked flask, and stir at high speed for 30 minutes. After the carbonyl iron powder was mixed and dispersed in absolute ethanol, 10 g of epoxy resin and 3 g of curing agent (4,4-diaminophenyl sulfone) were put in, and stirred and degassed at 90° C. When the viscosity of the material in the three-necked flask is relatively high, vacuum stirring and degassing is carried out, and the temperature is gradually heated from 90°C to 120°C. When no air bubbles can be observed with the naked eye at 120°C, pouring is carried out, and the mold is preheated with a release agent and 150°C in advance. The cast bodies were cured at 120°C for 3 hours and post-cured at 170°C for 2 hours. The casting body is demoulded, and finally cut and polished to be processed into samples of required specifications.

[0046] Under 10GHz, the mi...

Embodiment 2

[0048] Main ingredients: mass ratio (modified carbonyl iron powder): (epoxy resin E51) = 7:1

[0049] Add 50ml of absolute ethanol, 0.69g of distilled water, and 3g of KH-560 silane coupling agent into a three-necked flask to prepare a silane coupling agent solution, adjust the pH value to 3.5-5.5 with glacial acetic acid, place it in a three-necked flask, and weigh 100g of carbonyl iron powder Put it into a three-necked flask, ultrasonically disperse the solution, and stir at the same time. After reacting for 30 minutes, let the reactant stand still, wash it with absolute ethanol until it is neutral, dry it naturally for 24 hours, and finally dry it at 110°C for 2 hours to obtain Silane modified carbonyl iron powder.

[0050] 70 g of the modified carbonyl iron powder and 14 g of absolute ethanol were mixed in a three-necked flask, and stirred at high speed for 30 minutes. After the carbonyl iron powder was mixed and dispersed in absolute ethanol, 10 g of epoxy resin and 3 g ...

Embodiment 3

[0053] Main ingredients: mass ratio (carbonyl iron powder): (carbonyl nickel powder): (epoxy resin E51) = 5:2:1

[0054]Mix 50 g of carbonyl iron powder, 20 g of carbonyl nickel powder and 14 g of absolute ethanol in a three-necked flask, and stir at high speed for 30 minutes. After the metal powder was mixed and dispersed in absolute ethanol, 10 g of epoxy resin and 3 g of curing agent (4,4-diaminophenyl sulfone) were put in, and stirred and degassed at 90° C. When the viscosity of the material in the three-necked flask is relatively high, vacuum stirring and degassing is carried out, and the temperature is gradually heated from 90°C to 120°C. When no air bubbles can be observed with the naked eye at 120°C, pouring is carried out, and the mold is preheated with a release agent and 150°C in advance. The cast bodies were cured at 150°C for 2.5 hours and post-cured at 200°C for 1.5 hours. The casting body is demoulded, and finally cut and polished to be processed into samples ...

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Abstract

Belonging to microwave absorbing material technologies, the invention relates to a preparation method of a wave-absorbing composite material used for isolator loading. The method comprises the steps of: 1) putting powder into a diluent, stirring and dispersing the mixture; (2) adding epoxy resin and a curing agent, conducting stirring and degassing at a temperature of 70-100DEG C; 3) carrying outstirring and degassing in vacuum, with the temperature raised gradually from 90 to 120DEG C; 4) while generating no bubble, performing casting so as to obtain a casting body; 5) subjecting the casting body to curing, demoulding, and finally to cutting and polishing so as to be processed into a sample of required specifications. The microwave-absorbing composite material prepared by the method of the invention has good microwave-absorbing properties of: an adsorption loss of 4.69-6.88dB / mm under the conditions of 8-12GHz and 25DEG C, breakdown strength up to 1000V / mm, and a softening temperature of 170DEG C. The microwave-absorbing composite material provided in the invention can be used as loading elements in x-band isolators.

Description

technical field [0001] The invention belongs to microwave absorbing material technology, in particular to a method for preparing a wave-absorbing composite material for an isolator load. The microwave absorbing material is suitable as an absorbing load element in various isolators. Background technique [0002] The isolator is an indispensable part of various microwave subsystems, such as microwave transponders, microwave transmitters, microwave receivers, transponders in satellite systems, transmitters and receivers in microwave relay communication repeaters. The matching load is a key component of the isolator, and the characteristics of the isolator, such as operating frequency, bandwidth, power capacity and volume, etc., largely depend on the characteristics of the matching load. For operating frequencies above the X-band, the matching load of the isolator usually uses a microwave absorber (microwave absorbing material). The main problems of the current isolator load a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/14
Inventor 徐光亮余洪滔马寒冰宫剑郝建伟
Owner SOUTHWEAT UNIV OF SCI & TECH
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