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A high-temperature electromagnetic wave absorber, wave-absorbing coating and preparation method thereof

A wave-absorbing coating and electromagnetic wave technology, applied in the field of materials, can solve the problems of low absorption efficiency, low thickness, low Curie temperature, inability to effectively absorb electromagnetic waves, etc., and achieve the effect of excellent magnetoelectric properties

Active Publication Date: 2019-10-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the Curie temperature of most magnetic absorbers is low, the effective absorption of electromagnetic waves cannot be achieved at high temperatures
However, the electric loss type absorber with a higher working temperature only relies on the electric loss of the material to absorb electromagnetic waves. Due to the low absorption efficiency, the high temperature absorbing material is required to have a larger thickness.

Method used

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  • A high-temperature electromagnetic wave absorber, wave-absorbing coating and preparation method thereof
  • A high-temperature electromagnetic wave absorber, wave-absorbing coating and preparation method thereof
  • A high-temperature electromagnetic wave absorber, wave-absorbing coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1Y2

[0039] Example 1Y 2 co 17 Metal powder 1, wave-absorbing coating compounded with high temperature resistant silicone resin 1

[0040] Weigh Y and Co elements according to the alloy ratio, and obtain metal powder 1 with a powder particle size of less than 5 microns through smelting, rapid quenching, and ball milling processes, which is the high-temperature electromagnetic wave absorber, and its composition is Y 2 co 17 , the particle size is about 3.5 microns.

[0041] Prepare xylene, isobutanol, and methoxypropyl acetate as a mixed solvent at a volume ratio of 1:1:15, dissolve polyurethane-modified silicone resin in the above-mentioned mixed solvent, and mix polyurethane-modified silicone resin and metal powder The weight ratio of body 1 is 2:3 and mixed into a wave-absorbing slurry, and the uniformly mixed slurry is transferred to a spray gun with a capacity of 500ml, and the spraying time and rate are controlled to spray a coating with a thickness of 1.43mm on the copper ...

Embodiment 2Y2

[0045] Example 2Y 2 co 9 Fe 8 Metal powder 2, wave-absorbing coating compounded with high temperature resistant silicone 2

[0046] Weigh Y, Fe and Co elements according to the alloy ratio, and obtain metal powder 2 with a powder particle size of less than 5 microns through smelting, rapid quenching, and ball milling processes, which is the high-temperature electromagnetic wave absorber, and its composition is Y 2 co 9 Fe 8 , the particle size is about 3.5 microns.

[0047] Prepare a mixed solvent of xylene, isobutanol, and methoxypropyl acetate at a volume ratio of 1:1:15, dissolve the silicone epoxy hybrid resin in the above solvent, and mix the silicone epoxy hybrid resin and metal powder The weight ratio of body 2 is 1:1.8 and mixed into a wave-absorbing slurry, and the uniformly mixed slurry is transferred to a spray gun with a capacity of 500ml, and the spraying time and rate are controlled to spray a coating with a thickness of 1.84mm on the copper plate substrate. ...

Embodiment 3

[0051] Example 3 Nd 2 co 17 Metal powder 3, wave-absorbing coating compounded with high temperature resistant silicone resin 3

[0052] Weigh Nd and Co elements according to the alloy ratio, and obtain metal powder 3 with a powder particle size of less than 5 microns through smelting, rapid quenching, and ball milling processes, which is the high-temperature electromagnetic wave absorber, and its composition is Nd 2 co 17 , with a particle size of about 3 microns.

[0053] Prepare a mixed solvent of xylene, isobutanol, and methoxypropyl acetate at a volume ratio of 1:1:15, dissolve the silicone epoxy hybrid resin in the above solvent, and mix the silicone epoxy hybrid resin and metal powder The weight ratio of body 3 is 1:2.3 and mixed into a wave-absorbing slurry, and the uniformly mixed slurry is transferred to a spray gun with a capacity of 500ml, and the spraying time and rate are controlled to spray a coating with a thickness of 1.75mm on the copper plate substrate. l...

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Abstract

The invention discloses high-temperature electromagnetic wave absorbent. The high-temperature electromagnetic wave absorbent has soft magnetic performance, and curie temperature is 700 DEG C or above. The invention also discloses a microwave absorbing coating which is obtained by compounding the high-temperature electromagnetic wave absorbent and a binding agent, wherein, working temperature of the microwave absorbing coating is 400 DEG C or above, and compared with a normal-temperature state, the reduced capacity of microwave absorbing performance is less than 20 percent; therefore, the microwave absorbing coating can completely meet application requirements on military and civilian high-temperature resistant microwave absorbing materials such as communication and radar detection, and has a wide market application prospect.

Description

technical field [0001] The invention relates to the field of materials, in particular to a high-temperature electromagnetic wave absorber, a wave-absorbing coating and a preparation method thereof. Background technique [0002] In order to solve the problems of electromagnetic wave radiation interference, electromagnetic pollution and aircraft stealth, it is of great significance to use wave-absorbing materials to convert electromagnetic wave energy into other forms of energy or to suppress electromagnetic wave radiation and interference through electromagnetic wave interference and cancellation. According to the working temperature, the absorbing materials can be divided into two types: normal temperature absorbing materials and high temperature absorbing materials. In engines, aircrafts and special working environments, high temperature resistant absorbing materials are required. Most of the absorbing materials at room temperature use magnetic loss absorbers such as ferri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/32C09D183/04C09D163/00
Inventor 顾习胜满其奎谭果果陈淑文杨振李润伟王新敏李发伸
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI