Broadband silicon carbide high temperature resistant wave-absorbing coating and preparation method thereof

A wave-absorbing coating and silicon carbide technology, applied in the coating field, can solve the problems that the absorption frequency band cannot meet the actual needs, poor high-temperature resistance of the wave-absorbing coating, complex process, etc., and achieve good thermal shock resistance, coating Good binding force and high temperature resistance

Active Publication Date: 2014-06-25
LIAONING SILICATE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problems that the existing wave-absorbing coating has poor high-temperature resistance, complex process and absorption frequency band cannot meet actual needs, and provides a broadband silicon carbide high-temperature-resistant wave-absorbing coating and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 10 parts of spherical granular silicon carbide, 12 parts of silicon carbide nanowires, 12 parts of rod-shaped silicon carbide with an aspect ratio of 15, 10 parts of titanium dioxide, 3 parts of aluminum oxide, and 3 parts of magnesium oxide, and add 27 parts of the above raw materials Add 2 parts of surfactant glycerin and 21 parts of deionized water to the sodium silicate. After mixing in a ball mill for 4 hours, a wave-absorbing coating was obtained.

[0019] The GH3030 superalloy plate is sandblasted, and a transition layer containing NiCr AlY is sprayed on the alloy plate by plasma spraying, with a thickness of 0.15mm; a layer of wave-absorbing coating is sprayed on the transition layer, and the thickness is controlled at 0.5mm. Air-dry at room temperature for 12 hours, and heat-treat at 700°C for 8 hours to obtain a wave-absorbing coating.

Embodiment 2

[0021] Weigh 2 parts of spherical granular silicon carbide, 10 parts of silicon carbide nanowires, 8 parts of rod-shaped silicon carbide with an aspect ratio of 15, 4 parts of crystal silicon carbide, 6 parts of titanium dioxide, 4 parts of aluminum oxide, and 4 parts of magnesium oxide , adding the above raw materials into 22 parts of potassium silicate, and then adding 3 parts of surfactant glycerin and 37 parts of deionized water. After mixing in a ball mill for 4 hours, a wave-absorbing coating was obtained.

[0022] The GH3030 superalloy plate is sandblasted, and a transition layer containing NiCr AlY is sprayed on the alloy plate by plasma spraying, with a thickness of 0.15mm; a layer of wave-absorbing coating is sprayed on the transition layer, and the thickness is controlled at 1.5mm. Air-dry at room temperature for 24 hours, heat-treat at 900°C for 2 hours, and obtain a wave-absorbing coating.

Embodiment 3

[0024] Weigh 5 parts of spherical granular silicon carbide, 8 parts of silicon carbide nanowires, 9 parts of rod-shaped silicon carbide with an aspect ratio of 15, 8 parts of titanium dioxide, 6 parts of aluminum oxide, and 6 parts of magnesium oxide, and add 22 parts of the above raw materials In the sodium silicate, add 2 parts of surfactant glycerin and 1 part of ethylene glycol and 34 parts of deionized water again. After mixing in a ball mill for 4 hours, a wave-absorbing coating was obtained.

[0025] Sand blast the GH3030 high-temperature alloy plate, spray a transition layer containing NiCr AlY on the alloy plate by plasma spraying, the thickness is 0.15mm; spray a layer of wave-absorbing coating on the transition layer, the thickness is controlled at 1mm, and the temperature is normal Air-dried for 16 hours, and heat-treated at 900°C for 2 hours to obtain a wave-absorbing coating.

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Abstract

The invention relates to a broadband silicon carbide high temperature resistant wave-absorbing coating and a preparation method thereof, and mainly overcomes the problems of poor high temperature performance and complex process of conventional wave-absorbing coatings. The wave-absorbing coating takes silicon carbide micro powder as a main wave-absorbing agent; and wave-absorbing band is adjusted by controlling the proportions of silicon carbide in different morphologies. The preparation method comprises the steps of (1) preparation of a coating material: weighing the silicon carbide micro powder, oxide, a silicate binder, a surfactant and deionized water according to amounts, mixing the above raw materials and ball milling for 4 h to obtain the wave-absorbing coating material; (2) preparation of the coating: subjecting an alloy as a substrate to sand blasting treatment, then spraying a transition layer containing NiCr AlY on the substrate by a hot spraying method, spraying the prepared wave-absorbing coating material on the transition layer, drying the coating at a normal temperature, putting the coating into an oven for drying after the surface of the coating is dried, a drying temperature being 50-180 DEG C, subjecting the dried coating to heat treatment for 1-12 h at a temperature of 600-1,200 DEG C, and cooling the coating along with the oven to obtain the high temperature resistant wave-absorbing coating. The wave-absorbing band of the prepared wave-absorbing coating is mainly between 2 GHz and 20 GHz.

Description

technical field [0001] The invention relates to a broadband silicon carbide high-temperature resistant wave-absorbing coating and a preparation method thereof, in particular to a high-temperature resistant wave-absorbing coating with silicon carbide as the main wave-absorbing agent, belonging to the technical field of coatings. 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. At present, the absorbing agent used in the absorbing coating can be divided into two types: electric loss and magnetic loss. Magnetic loss materials mainly include ferrite, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 周岩韩绍娟许壮志薛健张明杨殿来
Owner LIAONING SILICATE RES INST
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