High temperature-resistant electromagnetic wave-absorbing coating and use thereof

A wave-absorbing coating, high-temperature resistant technology, applied in coatings, radiation-absorbing coatings, fire-retardant coatings, etc., can solve the problems of maintaining wave-absorbing performance, but cannot completely solve the problem of anti-oxidation and large specific surface area of ​​wave-absorbing coatings , to achieve the effect of ensuring temperature stability

Active Publication Date: 2017-03-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the absorber occupies a sufficient proportion in the wave-absorbing coating to have a certain wave-absorbing performance, and the absorber particles are small, the specific surface area is large, and the coating thickness is not enough, the single high-temperature-resistant wave-absorbing coating coated on the substrate can only It can improve the anti-oxidation performance of the absorber to a certain extent, but it cannot completely solve the anti-oxidation problem of the wave-absorbing coating, or this kind of coating can only withstand instantaneous high temperature and cannot maintain the wave-absorbing performance in a long-term high-temperature environment

Method used

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  • High temperature-resistant electromagnetic wave-absorbing coating and use thereof
  • High temperature-resistant electromagnetic wave-absorbing coating and use thereof
  • High temperature-resistant electromagnetic wave-absorbing coating and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Preparation of high temperature resistant wave-absorbing coating

[0021] Using ammonia water and tetraethyl orthosilicate as raw materials, the surface-coated SiO 2 Membrane of carbonyl iron powder absorbent.

[0022] Silicone modified epoxy resin was prepared according to the method described in patent CN201010233875.8.

[0023] In terms of mass, according to the surface coated SiO 2 Film carbonyl iron powder absorbent 10-60 parts; pigments and fillers 2-40 parts; silicone modified epoxy resin 15-45 parts; high temperature resistant phenolic resin curing agent 1-10 parts; coupling agent (KH560) 0.5- 5 parts; the proportion range of 10-50 parts of the mixed solvent, weighing each raw material, fully mixing the above raw materials, and ball milling in a ball mill for 4 hours to obtain a wave-absorbing coating.

[0024] In terms of mass, 6-60 parts of pigments and fillers; 15-45 parts of silicone modified epoxy resin; 1-10 parts of high temperature resistan...

Embodiment 2

[0029] Example 2: Test of reflectivity curve of high temperature resistant wave-absorbing coating

[0030] Taking coated plates 1, 2, 3, and 4 as objects, the reflectivity curve of the coating at 8-18 GHz was tested. attached figure 2 is the real-time reflectance of coating plate 1 tested at 350°C high temperature, attached image 3 is the real-time reflectance of coating plate 2 tested at 300°C high temperature, attached Figure 4 is the real-time reflectance of coating plate 3 tested at 300°C high temperature, attached Figure 5 is the real-time test reflectance of the coated plate 4 at room temperature and 350°C high temperature respectively. The test method adopts the bow frame method described in GJB 5022-2011; the high temperature real-time test adopts the flat furnace heating, and reaches the bow frame method test.

Embodiment 3

[0031] Example 3: Reflectivity test of high temperature resistant wave-absorbing coating

[0032] Taking coated panels 1, 2, 3, and 4 as objects, test the adhesion, flexibility, and impact strength of the coating. See Table 2 for the test content, achieved indicators and reference test methods.

[0033] Table 2 Conventional performance tests of high temperature resistant wave-absorbing coatings

[0034]

[0035] Note: High temperature (300°C) adhesion is the coating adhesion measured after the coated plate is kept in a muffle furnace at 300°C for 2 hours and cooled to room temperature.

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Abstract

The invention belongs to the technical field of electronic materials and relates to a high temperature-resistant electromagnetic wave-absorbing coating and its use in aircraft stealth. The high temperature-resistant electromagnetic wave-absorbing coating comprises at least one wave absorbing layer (1) coating a substrate and two thermal insulation oxygen barrier layers (2). The two thermal insulation oxygen barrier layers (2) are respectively located on the upper and lower surfaces of the wave absorbing layer (1). The wave absorbing layer (1) comprises a high temperature resistant absorbent and a high temperature resistant resin as main components, and has functions of absorbing electromagnetic wave and resisting oxidation. The thermal insulation oxygen barrier layer (2) mainly comprises a high temperature resistant resin and a filler, reduces the temperature of the wave absorbing layer (1) at a high temperature and blocks direct contact between the wave absorbing layer (1) and air. The high temperature-resistant electromagnetic wave-absorbing coating can be applied to the outer surface of an aircraft and realize radar stealth of a target in a high temperature environment.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, in particular to a high-temperature resistant electromagnetic wave absorbing coating and its application in aircraft stealth. Background technique [0002] Absorbing materials refer to a class of materials that can attenuate incident electromagnetic waves and convert their electromagnetic energy into thermal energy to dissipate or make electromagnetic waves disappear due to interference. The wave-absorbing coating refers to a functional coating in which the wave-absorbing material is coated on the surface of the substrate through a certain structural design to make it have wave-absorbing capabilities. [0003] When the aircraft is flying at high speed, it is accompanied by strong airflow and the surface temperature is relatively high. This requires that the wave-absorbing coating used not only needs to have a wide absorption frequency band, but also has properties such as high tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/32C09D7/12C09D161/06B64C1/00
CPCB64C1/00C08K3/08C08K3/22C08K3/36C08K9/10C08K2003/0856C08K2003/2227C08K2003/2296C09D5/18C09D5/32C09D7/61C09D7/63C09D7/70C09D161/06C09D163/00
Inventor 邢欣周永江程海峰王楠楠李俊生
Owner NAT UNIV OF DEFENSE TECH
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