Temperature-resistant thermal-spray radar absorbing coating and preparation method of spraying powder thereof

A technology of wave absorbing coating and spraying powder, applied in the direction of coating, metal material coating process, melting spray plating, etc., can solve the problem of low temperature resistance of wave absorbing coating, and achieve good wave absorbing performance and mechanical performance. Excellent effect with simple preparation process

Active Publication Date: 2012-10-31
CHINESE ACAD OF AGRI MECHANIZATION SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a heat-resistant thermal spray radar absorbing coating and its

Method used

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  • Temperature-resistant thermal-spray radar absorbing coating and preparation method of spraying powder thereof
  • Temperature-resistant thermal-spray radar absorbing coating and preparation method of spraying powder thereof
  • Temperature-resistant thermal-spray radar absorbing coating and preparation method of spraying powder thereof

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Example Embodiment

[0039] Further, the preparation method of the above-mentioned spray powder for radar absorbing coating of the present invention includes the following steps:

[0040] Step 1: Mix the glass, glaze or enamel binder and the absorbent uniformly, add the organic binder, and stir thoroughly to form a slurry, so that the absorbent in the slurry is evenly dispersed;

[0041] Step 2: Vacuum drying the slurry obtained in step 1 to obtain a green body with lower strength, use smelting crushing or sintering crushing process to prepare thermal spray powder; also use agglomeration sintering process to prepare powder, and spray the slurry Dry granulation treatment to obtain spherical powder, which can be used for thermal spraying after drying and light sintering.

[0042] Preferably, it can also include step 3: After the above step 2 is completed, the powder is processed by a flame spray gun or a plasma spray gun flame flow to make the glass cement material form a molten skeleton structure, and at ...

Example Embodiment

[0052] Example 1: Preparation of low-melting glass and nickel-coated SiC absorbent system materials and coatings

[0053] Raw material: PbO 2 -SiO 2 Glass (average particle size <2μm) 400g, 30wt.% Ni-coated SiC powder (<14μm) 100g.

[0054] After the above-mentioned raw material powders are fully mixed, pure water and diluted polyvinyl alcohol solution (dilution ratio is about 10:1) are added, and the mixture is fully stirred, and the obtained slurry is fully dried in a vacuum drying box to form a dried body. , Put the green body into a vacuum sintering furnace, control the furnace temperature to 600℃, control the heating rate to 100℃ / 15min during the sintering process, and keep the temperature at 600℃ for 5h to ensure that the glass material is completely sintered. Crushing, pulverizing and sieving to obtain thermal spray powder materials with a particle size range of 45μm to 98μm. Use oxygen-acetylene flame spraying system to prepare the coating. Use flame spraying equipment wit...

Example Embodiment

[0055] Example 2:

[0056] Raw materials: 350g of phosphate glass powder (average particle size <3μm), 150g of FeNiCoAlSiRe alloy (~10μm).

[0057] Mix the above raw materials thoroughly, add a small amount of pure water to ensure that the solid content in the slurry is 50-65%, add 1-1.5% polyvinyl alcohol (PVA) as a binder during the stirring process, and use centrifugal spray drying granulation equipment Granulation process to obtain spherical powder, vacuum drying the powder at low temperature (100-150°C), sieving the dried powder, and finally obtaining spherical powder with a particle size between 25 μm and 53 μm. Using supersonic flame spraying equipment for spraying, a coating with a thickness of 1.2mm was prepared, and the peak reflectivity of the coating was (9.76GHz, -9.29dB). Coating bonding strength is 18MPa, when the coating thickness is 0.5mm, the areal density is 1.78Kg / m 2 . See the frequency-reflectance curve result of coating performance test Figure 4 , And its ...

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Abstract

The invention discloses a thermal spraying powder material used in a radar absorbing coating, a thermal-spray radar absorbing coating, and a preparation method thereof. The radar absorbing coating comprises an absorbing agent and an inorganic binder used for binding and dispersing the absorbing coating. The inorganic binder is selected from glass, glaze, or an enamel material. The forming process of the coating is a thermal spraying process. According to the invention, glass, glaze, or the enamel material is adopted as the binder; the temperature resistance of the prepared coating is substantially higher than those of traditional absorbing paints, and can be higher than 300 DEG C. The material has good absorbing performance. The coating has excellent mechanical properties, so that surface coating preparation requirements of different types of parts can be satisfied.

Description

technical field [0001] The invention relates to the technical field of radar absorbing coatings. Background technique [0002] In recent years, with the continuous development of stealth technology, for some medium and high temperature components in the fields of aviation and ground weapons, the demand for heat-resistant radar absorbing coatings has become increasingly obvious. Traditional absorbing coatings use absorbent materials and organic binders. The composition is limited by the binder material and the temperature resistance is limited. Traditional absorbing coatings are usually prepared by brushing or spraying. Since the use temperature of organic binders is difficult to exceed 300°C, after a long-term use temperature exceeds 150°C, problems such as carbonization of organic matter, decreased flexibility, and reduced impact resistance cannot be solved, and the materials cannot meet the use requirements. At the same time, under some harsh working conditions, such as a...

Claims

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Application Information

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IPC IPC(8): C23C4/04C23C4/12C23C4/129C23C4/134
Inventor 何箐汪瑞军武铁军王世兴
Owner CHINESE ACAD OF AGRI MECHANIZATION SCI
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