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A high-temperature-resistant high-radiation thermal control coating and its preparation method

A technology of thermal control coating and high radiation, applied in the direction of coating, etc., can solve the problems of poor thermal expansion matching of substrates, poor mechanical shock resistance, and low service temperature, and achieve good bonding force, good thermal shock resistance, Effect of lowering substrate temperature

Active Publication Date: 2017-08-29
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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Problems solved by technology

Organic high-radiation coatings have the disadvantage of low operating temperature, and the operating temperature generally does not exceed 400°C. Although inorganic high-radiation coatings have good high temperature resistance, they have poor thermal expansion matching with the substrate, poor adhesion, and mechanical resistance. The problem of poor impact ability

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  • A high-temperature-resistant high-radiation thermal control coating and its preparation method

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preparation example Construction

[0031] Such as figure 1 Shown is the flow chart of the preparation of the high-temperature-resistant and high-radiation coating of the present invention. The preparation method of the high-temperature-resistant and high-radiation thermal control coating of the present invention specifically includes the following steps:

[0032] Mix fillers, film formers and organic solvents according to the proportion by high-speed stirring, ball milling or sand milling for 1-3 hours, use air spraying process to spray the uniformly mixed paint on the surface of the substrate to be sprayed, and then firstly cure at room temperature for 6-12 hours , and then cured at 150-200°C for 1-3 hours to complete the preparation, or directly cured at room temperature for 24-72 hours to complete the preparation. The organic solvent is butyl acetate. Wherein the mass percent content of the organic solvent in the evenly mixed paint is 40%-50%. Wherein the base material to be sprayed is metal or non-metal b...

Embodiment 1

[0034] First, a high-temperature-resistant high-radiation slurry is prepared, and its raw material ratio is (mass percentage content): 18.75wt% of cerium oxide, 18.75wt% of boron carbide, 12.5wt% of polyborosilazane, and 50.00wt% of butyl acetate. All raw materials were ball milled and mixed for 3 hours to form a homogeneous slurry.

[0035] Then, an air spraying process is used to spray and prepare coatings on substrates such as stainless steel substrates, nickel-based superalloys, carbon-carbon composite materials, or porous ceramic insulation materials.

[0036] Finally, the sprayed high radiation coating was placed at room temperature for 12 hours, and then cured at 150°C for 3 hours. The resulting coating thickness was 120 μm.

[0037] The emissivity of the high-temperature-resistant high-radiation coating is 0.85 at 1100K, and the maximum service temperature is 1300°C. After 10 times of thermal shock resistance tests at 1100K-room temperature, the coating does not peel ...

Embodiment 2

[0039] Firstly, a high-temperature-resistant and high-radiation slurry is prepared, and its raw material ratio is: 28.31wt% of cerium oxide, 9.44wt% of boron carbide, 12.25wt% of polyborosilazane, and 50.00wt% of butyl acetate. All raw materials were stirred and mixed at high speed for 3 hours to form a homogeneous slurry.

[0040] Then, an air spraying process is used to prepare coatings by spraying on substrates such as stainless steel substrates, nickel-based superalloys, carbon-carbon composite materials or porous ceramic insulation materials.

[0041] Finally, the sprayed high-radiation coating was placed at room temperature for 12 hours, and then cured at 170° C. for 3 hours, and the obtained coating thickness was 50 μm.

[0042] The high-temperature-resistant high-radiation coating has an emissivity of 0.88 at 1100K and a maximum service temperature of 1300°C. After 10 thermal shock resistance tests at 1100K-room temperature, the coating does not peel off or fall off.

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Abstract

The invention relates to a high-temperature-resistant and high-radiation-resistant thermal control coating and a preparation method thereof. A paint for forming the thermal control coating comprises a filler and a film forming matter, wherein the filler is a mixture composed of a rare earth oxide and boron carbide or a mixture composed of the rare earth oxide and silicon carbide; the film forming matter is polyborosilazane, polysiloxoazane or high-temperature-resistant organic silicon resin; and the mass ratio of the filler to the film forming matter is (3-9):1. The thermal control coating provided by the invention has the advantages of high-temperature resistance, high emission rate and strong thermal shock resistance, and meanwhile, the thermal control coating has the advantages of simple preparation method, convenient construction, wide base material adaptive surface and easy repair, and can meet requirements for high temperature radiation heat loss in military and civilian fields.

Description

technical field [0001] The invention relates to a coating, in particular to a high-temperature-resistant and high-radiation thermal control coating and a preparation method thereof. Background technique [0002] High-temperature-resistant and high-radiation coatings can enhance the radiative heat transfer capability of the substrate surface, and are widely used in drying and heating, aerospace, environmental protection building materials and other fields. [0003] Foreign high-temperature and high-radiation coatings have been used in the aerospace field for nearly 50 years, especially in space shuttles. They have also been used in civilian applications for more than 30 years. The results show that high-temperature and high-radiation coatings It plays a very important role in the fields of thermal control, thermal protection, energy saving and environmental protection. High-radiation materials are used on the surface of newly developed reusable aircraft (such as X-37B) and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/16C09D183/14C09D183/04C09D7/12
Inventor 李俊峰卢鹉罗正平
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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