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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 powder preparation method to solve the defects of low temperature resistance of radar absorbing coatings and absorbing coatings in the prior art

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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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preparation example Construction

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

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

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

[0042] Preferably, step 3 may also be included: after the above-mentioned step 2 is completed, the powder is treated by a flame spray gun or a plasma spray gun to form a molten skeleton structure for the glass bond material, and at the same time f...

Embodiment 1

[0052] Example 1: Low melting point glass and nickel-coated SiC absorber system material and coating preparation

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

[0054] After fully mixing the above raw material powders, add pure water and diluted polyvinyl alcohol solution (dilution ratio is about 10:1), stir well, and fully dry the obtained slurry in a vacuum drying oven to form a dry green body , put the green body into a vacuum sintering furnace, control the furnace temperature to 600°C, control the heating rate to 100°C / 15min during the sintering process, and keep it at 600°C for 5 hours at the same time to ensure that the glass material is completely sintered. Crushing, pulverizing, and sieving to obtain thermal spraying powder materials with a particle size ranging from 45 μm to 98 μm. Oxygen-acetylene flame spraying system is used to prepare the coating, and the flame temperature of the flam...

Embodiment 2

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

[0057] Fully mix the above raw materials, add a small amount of pure water to ensure that the solid content of the slurry is 50-65%, add 1-1.5% polyvinyl alcohol (PVA) as a binder during the stirring process, and use centrifugal spray drying and granulation equipment to carry out Granulation treatment to obtain spherical powder, the powder is vacuum-dried at low temperature (100-150° C.), and the dried powder is sieved to finally obtain spherical powder with a particle size between 25 μm and 53 μm. The supersonic flame spraying equipment was used for spraying to prepare a coating with a thickness of 1.2mm, and the peak reflectivity of the coating was (9.76GHz, -9.29dB). The bonding strength of the coating is 18MPa, and when the coating thickness is 0.5mm, the surface density is 1.78Kg / m 2 . The frequency-reflectivity curve results of the coating performanc...

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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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