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High-temperature-resistant wave absorption coating and preparation method thereof

A wave-absorbing coating and high-temperature-resistant technology, which is applied to radiation-absorbing coatings, fire-resistant coatings, coatings, etc., can solve problems such as low adhesion, poor high-temperature resistance, and high surface density, and overcome poor high-temperature resistance, Improved absorbing performance and easy operation

Active Publication Date: 2019-08-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, microwave absorbers are mainly used for dielectric loss or magnetic loss absorbing materials such as ferrite, magnetic metal powder, and barium titanate. Adhesives are mainly organic resins such as butane rubber, epoxy resin, etc. Resin, phenolic resin, etc. However, the biggest disadvantage of choosing organic glue as an adhesive is its poor high temperature resistance, which further makes the prepared coating not have high temperature resistance
Although the preparation process of coated wave-absorbing materials is not complicated, to prepare a light and strong wave-absorbing coating, it is necessary to overcome problems such as high surface density, poor heat resistance and wear resistance, low adhesion, coating coating, etc. The selection of wave absorbing agent and adhesive will also affect the wave absorbing performance of the final prepared coating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the preparation method of the wave-absorbing coating is implemented according to the following steps:

[0023] Weigh 36g of carbon powder, 45g of silica powder, 21g of silicon powder, and 17.7g of cobalt powder and mix them in a ball mill jar; ball mill for 1 hour at a speed of 240r / min; take out the obtained powder and place it in a graphite crucible, and place it in a high-temperature furnace Sintering at 1600°C for 4 hours in an inner argon atmosphere, the temperature rise rate is 5°C / min to 1000°C, 2.5°C / min to 1600°C, keep warm for 4 hours and then cool to room temperature; after cooling, grind the powder taken out, and grind 80g of powder The solid content was added to 227g of silicate with a solid content of 40%, and after mixing and dispersing evenly, a high-temperature-resistant wave-absorbing coating was obtained.

Embodiment 2

[0025] In this embodiment, the preparation method of the wave-absorbing coating is implemented according to the following steps:

[0026] Weigh 36g of carbon powder, 45g of silica powder, 21g of silicon powder, and 17.7g of cobalt powder and mix them in a ball mill jar; ball mill for 1 hour at a speed of 240r / min; take out the obtained powder and place it in a graphite crucible, and place it in a high-temperature furnace Sintering at 1600°C for 4 hours in an inner helium atmosphere, the temperature rise rate is 5°C / min to 1000°C, 2.5°C / min to 1600°C, keep warm for 4 hours and then cool to room temperature; after cooling, grind the powder taken out, and grind 100g of powder The solid content was added to 227g aluminum sol with a solid content of 40%, and after mixing and dispersing evenly, a high-temperature resistant wave-absorbing coating was obtained.

Embodiment 3

[0028] In this embodiment, the preparation method of the wave-absorbing coating is implemented according to the following steps:

[0029] Weigh 36g of carbon powder, 45g of silica powder, 21g of silicon powder, and 8.85g of cobalt powder and mix them in a ball mill jar; ball mill for 1 hour at a speed of 240r / min; take out the obtained powder and place it in a graphite crucible, and place it in a high-temperature furnace Sintering at 1600°C for 4 hours in an inner argon atmosphere, the temperature rise rate is 5°C / min to 1000°C, 2.5°C / min to 1600°C, keep warm for 4 hours and then cool to room temperature; after cooling, grind the powder taken out, and grind 80g of powder The body was added to 227g of silica sol with a solid content of 40%, and after mixing and dispersing evenly, a high-temperature-resistant wave-absorbing coating was obtained.

[0030] from figure 1 It can be seen from the figure that the main component of the wave absorbing agent powder material prepared in ...

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Abstract

The invention discloses a high-temperature-resistant wave absorption coating and a preparation method thereof. The wave absorption coating is prepared from a wave absorption agent and an inorganic glue, wherein the inorganic glue is one of a silicate, a phosphate, alumina sol and silica sol; the wave absorption agent is prepared from silicon powder, silica powder, carbon powder and cobalt powder as raw materials. The preparation method comprises the following steps: firstly, carrying out one-step solid-phase sintering so as to obtain the wave absorption agent with good wave absorption properties, and secondly, dispersing the wave absorption agent into the high-temperature-resistant inorganic glue, thereby obtaining the high-temperature-resistant wave absorption coating which is excellent in property. The high-temperature-resistant wave absorption coating has the advantages that after cobalt powder is introduced and sintering is carried out, the prepared wave absorption agent has excellent wave absorption properties, compared with a conventional coating with a glue agent such as an organic glue or a resin, the coating with the inorganic glue as an adhesive has remarkable advantagesin high-temperature resistance, and the process that the wave absorption agent is stirred, dispersed and mixed with the inorganic glue to form the wave absorption coating is simple.

Description

technical field [0001] The invention belongs to the technical fields of wave-absorbing, environmental protection, energy and protective materials, and relates to a wave-absorbing coating and a preparation method thereof, in particular to a high-temperature-resistant wave-absorbing coating and a preparation method thereof. Background technique [0002] Silicon carbide was discovered in meteorites for the first time. Due to its high temperature resistance, corrosion resistance, good chemical stability, light weight and excellent microwave absorption performance, it is considered to be one of the most promising high-temperature absorbing materials for practical applications. one. The current methods of preparing silicon carbide generally include chemical vapor deposition, sol-gel method, template method, carbothermal reduction method, etc. The particle size of the prepared silicon carbide powder is also different, and the industrially prepared carbonized Silicon is mainly blac...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D5/32
CPCC09D1/00C09D5/18C09D5/32
Inventor 王志江吴建廷
Owner HARBIN INST OF TECH