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Preparation method for an inorganic ceramic coating with high heat resistance

An inorganic ceramic, high-temperature-resistant technology, applied in the chemical industry, can solve the problems of material damage, thinning, mechanical strength and wave transmission coefficient reduction, etc., and achieve good mechanical properties, dense and smooth surface, and good waterproof performance

Active Publication Date: 2011-10-26
ZHONGCAI HIGH NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the flight Mach number of the missile, the aerodynamic heating suffered by the missile during the flight is becoming more and more serious. In addition to the aerodynamic heating, the radome also has to bear the aerodynamic load of the missile and the erosion of harsh environments such as rain and sand during the flight. , leading to material damage, thinning, greatly reducing mechanical strength and wave transmission coefficient, and even causing scrapping of the radome in severe cases
The traditional radome coating is basically an organic coating. The biggest disadvantage of the organic coating is that when the missile is flying, the surface of the organic coating is easy to carbonize at high temperature, and it is easy to cause residual carbon and other components, which will affect the wave transmission performance of the radome. , thus affecting the performance of the cover

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Raw materials used:

[0025] Lithium carbonate, aluminum nitrate nonahydrate, barium chloride and aluminum chloride are all analytically pure, with a weight content of ≥99%; tetraethyl orthosilicate is analytically pure, with a weight content of ≥98%.

[0026] Dissolve 74g of lithium carbonate, 750g of aluminum nitrate nonahydrate, and 86g of yttrium oxide in 1500ml of water, and stir until a clear and transparent solution is used; weigh 840g of tetraethyl orthosilicate, then add 100ml of ethanol, 325ml of water, and 2ml of nitric acid, Adjust the pH to 3, fully stir to obtain a clear and transparent hydrolysis solution for use; fully mix the clear and transparent solution and the hydrolysis solution, stir with an electric stirrer for 2 hours to obtain a clear sol, and obtain a gel at a constant temperature of 70°C. Fully dry in a drying oven at 150°C, and calcinate in a muffle furnace at 1150°C for 2 hours to obtain ceramic powder 1.

[0027] Weigh 240g of barium chlo...

Embodiment 2

[0032] Raw materials used:

[0033] Lithium carbonate, aluminum nitrate nonahydrate, barium chloride and aluminum chloride are all analytically pure, with a weight content of ≥99%; tetraethyl orthosilicate is analytically pure, with a weight content of ≥98%.

[0034] Dissolve 75g of lithium carbonate and 1500g of aluminum nitrate nonahydrate in 3600ml of water, and stir until the clear solution is ready for use; weigh 500g of ethyl orthosilicate, then add 100ml of ethanol, 260ml of water, and 2ml of hydrochloric acid to adjust the pH to 1. Fully stir to obtain a clear and transparent hydrolysis solution for use; fully mix the clear and transparent solution with the hydrolysis solution, stir with an electric mixer for 3 hours to obtain a clear sol, and obtain a gel at a constant temperature of 90°C, and place the gel in a drying oven It was fully dried at 120°C, and calcined at 1100°C for 3 hours in a muffle furnace to obtain a ceramic powder.

[0035] Weigh 120g of barium chl...

Embodiment 3

[0040] Raw materials used:

[0041] Lithium carbonate, aluminum nitrate nonahydrate, barium chloride and aluminum chloride are all analytically pure, with a weight content of ≥99%; tetraethyl orthosilicate is analytically pure, with a weight content of ≥98%.

[0042]Dissolve 75g of lithium carbonate, 600g of aluminum nitrate nonahydrate, and 75g of lanthanum oxide in 750ml of water, and stir until a clear and transparent solution is used; weigh 500g of ethyl orthosilicate, then add 300ml of ethanol, 400ml of water, and 2ml of hydrochloric acid, Adjust the pH to 2, fully stir to obtain a clear and transparent hydrolysis solution for use; fully mix the clear and transparent solution and the hydrolysis solution, stir with an electric stirrer for 3 hours to obtain a clear sol, and obtain a gel at a constant temperature of 600°C. Fully dry in a drying oven at 200°C, and calcinate in a muffle furnace at 1300°C for 1 hour to obtain ceramic powder 1.

[0043] Weigh 120g of barium chl...

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Abstract

The invention relates to a preparation method for an inorganic ceramic coating with high heat resistance. The method is characterized by comprising the following steps: respectively dissolving lithium carbonate, aluminum nitrate nonahydrate and rare earth oxide in water, and carrying out stirring until a clear transparent solution a is obtained; dissolving barium chloride and aluminum chloride inwater, and carrying out stirring until a clear transparent solution b is obtained; adding ethyl orthosilicate and anhydrous ethanol into distilled water, adding an acid catalyst, and carrying out stirring until a clear solution c is obtained; respectively obtaining clear sol ac and sol bc, carrying out the process of gelation on sol ac and sol bc at a constant temperature being in a range of 60 to 90 DEG C so as to obtain gel ac and gel bc; calcining gel ac and gel bc to obtain ceramic powder ac and ceramic powder bc; calcining ceramic powder ac and ceramic powder bc into frits; preparing thefrits, a binder and distilled water into slurry, and spraying the slurry onto the surface of a substrate, and calcining the substrate so as to obtain the inorganic ceramic coating with high heat resistance. The obtained inorganic ceramic coating has a fine and smooth surface, good waterproof performance, excellent mechanical properties and high strength, well couples with the substrate, and produces an effect of expanding bandwidth.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature-resistant inorganic ceramic coating, which belongs to the field of chemical industry Background technique [0002] The missile radome is a facility to ensure the normal operation of the radar antenna system. It is not only a component of the missile body, but also a component of the radar guidance system. With the increase of the flight Mach number of the missile, the aerodynamic heating suffered by the missile during the flight is becoming more and more serious. In addition to the aerodynamic heating, the radome also has to bear the aerodynamic load of the missile and the erosion of harsh environments such as rain and sand during the flight. , leading to material damage, thinning, greatly reduced mechanical strength and wave transmission coefficient, and even the scrapping of the radome in severe cases. The traditional radome coating is basically an organic coating. The biggest disadv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/18C04B35/622
Inventor 韦其红王重海李伶王洪升李勇程之强陈达谦张晓丽翟萍
Owner ZHONGCAI HIGH NEW MATERIAL
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