Multi-element composite microwave absorbent, microwave absorbing coating, microwave absorbing base material and preparation method

A multi-component composite and wave-absorbing coating technology, which is applied in radiation-absorbing coatings, coatings, textiles, and papermaking, can solve the problems of unsatisfactory absorption performance, achieve excellent reflection loss performance, excellent wave-absorbing performance, and reduce electrical conductivity. Effect

Active Publication Date: 2013-05-01
NANJING LUOPU TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for microwave anechoic chambers, the absorp

Method used

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  • Multi-element composite microwave absorbent, microwave absorbing coating, microwave absorbing base material and preparation method
  • Multi-element composite microwave absorbent, microwave absorbing coating, microwave absorbing base material and preparation method
  • Multi-element composite microwave absorbent, microwave absorbing coating, microwave absorbing base material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 Preparation of multi-component composite wave absorbing agent, wave-absorbing coating, and wave-absorbing substrate

[0052] 1. Preparation of multi-component composite wave absorbing agent

[0053] The first step, the raw materials ZnO, NiO, Fe 3 o 4 After adding deionized water, ball mill, dry, and grind to obtain a mixed powder; raw materials ZnO, NiO, Fe 3 o 4 The molar ratio is 2.1:0.9:2;

[0054] Among them, the raw materials ZnO, NiO, Fe 3 o 4 The purity of each is more than 99%; the ball milling speed is at least 200 rpm, and the ball milling time is at least 24 hours;

[0055] In the second step, the powder obtained in the first step is pre-calcined, ball milled, dried, and ground to obtain Ni 0.7 Zn 0.3 Fe 2 o 4 powder;

[0056] Wherein, the calcining temperature is at least 1200°C, and the calcining time is at least 3 hours; the ball milling speed is at least 200 rpm, and the ball milling time is at least 24 hours;

[0057] The third ste...

Embodiment 2

[0073] Example 2 Detection of resistivity of absorbing substrate

[0074] According to the method of Example 1, when the value of x is 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and the limit value 1.0, the wave-absorbing substrate is prepared, and its resistivity is detected, and the result is as follows image 3 As shown, it can be seen that with the increase of x value, the resistivity of the absorbing substrate decreases continuously.

[0075] Since the resistivity can represent the basic electrical parameters of the manufactured product, it can be quickly judged whether the basic performance of the product meets the requirements by checking the resistivity in actual production.

Embodiment 3

[0076] Example 3 Detection of Reflection Loss Performance of Absorbing Substrate

[0077] According to the method of Example 1, when x takes values ​​of 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and a limit value of 1.0, the absorbing substrate is prepared, and its reflection loss performance to 1-18GHz microwaves is detected, mainly The results are:

[0078] 1. Reflection loss performance for 1GHz, 3GHz, 6GHz, 10GHz, 15GHz, 18GHz microwave:

[0079]

1GHz

3GHz

6GHz

10GHz

15GHz

18GHz

x=0.2

-33dB

-42dB

-51dB

-50dB

-37dB

-28dB

x=0.3

-33dB

-43dB

-53dB

-52dB

-44dB

-40dB

x=0.4

-35dB

-47dB

-60dB

-62dB

-55dB

-55dB

x=0.5

-44dB

-58dB

-63dB

-67dB

-60dB

-60dB

x=0.6

-36dB

-45dB

-61dB

-65dB

-58dB

-57dB

x=0.7

-35dB

-45dB

-58dB

-60dB

-54dB

-50dB

x=0.8

-36dB

-47dB ...

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Abstract

The invention relates to a multi-element composite microwave absorbent, a microwave absorbing coating, a microwave absorbing base material and a preparation method. The multi-element composite microwave absorbent is composed of ACET (acetylene black), alpha-SiC and Ni0.7Zn0.3Fe2O4 based on a weight ratio, wherein the microwave absorbing coating is composed of the microwave absorbent, de-ionized water, a PVA (Polyvinyl Alcohol) solution, a wetting agent, a dispersing agent, a de-foaming agent and a water-based leveling agent based on a weight ratio; and the microwave absorbing base material comprises a plurality of pyramidal substrates of which both sides are coated with the microwave absorbing coating. According to the invention, the microwave absorbing base material has excellent reflection loss performance for 118 GHz microwaves, and can be used for manufacturing an anechoic chamber.

Description

technical field [0001] The invention relates to a multi-component composite wave absorbing agent, a wave absorbing paint using the wave absorbing agent, a wave absorbing substrate coated with the wave absorbing paint, and their preparation methods. Background technique [0002] As far as the applicant knows, a microwave anechoic chamber refers to the use of wave-absorbing materials (ie, microwave absorbing materials) to pave the inner wall to reduce electromagnetic wave reflection, thereby forming a limited space close to "free space" (ie, an open space without electromagnetic wave reflection). The microwave anechoic chamber can simulate the "open field" to carry out the measurement, debugging and comprehensive experiments of radar, radio and military and civilian electronic and electrical equipment. The performance of the microwave anechoic chamber mainly depends on the performance of the absorbing material. Absorbing materials are a class of materials that can absorb and ...

Claims

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Application Information

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IPC IPC(8): C09D129/04C09D5/32D06M11/73D06M11/77D06M11/49D06M15/327
Inventor 王磊金宇龙顾卫军朱俊阳
Owner NANJING LUOPU TECH CO LTD
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