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Closed-pore ceramic microsphere filled gradient ceramic coating and preparation method thereof

A technology of ceramic coating and ceramic microspheres, which is applied in the field of ceramic coating, can solve the problem of unstable closed pores of porous ceramics, achieve low thermal conductivity, good high temperature chemical stability, and avoid the effect of connecting pores

Pending Publication Date: 2022-02-25
ZHAOSHAN TECH BEIJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the closed pores of porous ceramics with this type of structure are unstable and easy to communicate with each other to form a connected pore structure.

Method used

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  • Closed-pore ceramic microsphere filled gradient ceramic coating and preparation method thereof

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preparation example Construction

[0027] The present invention designs a kind of preparation method of gradient ceramic coating filled with closed-cell ceramic microspheres, and the specific steps are as follows:

[0028] S1. Preparation of solid microspheres

[0029] A Use aluminum salt as the precursor, add solvent, and prepare alumina sol by heating and hydrolyzing; the mass ratio of alumina sol to silica sol is (2-5):1, add silica sol and mix evenly, at 35-60°C Treat under the same conditions for 2-5 hours to obtain a silicon-aluminum composite sol with a viscosity of 16.8-45.0mPa·s;

[0030] B. Immerse organic resin microspheres with a particle size of 10-30 μm in the composite sol for 10-30 minutes, take them out and keep them in an oven at 100-120°C for 12-24 hours, then impregnate the microspheres in the composite sol, heat-preserve and dry, according to The thickness of the microspheres is repeated 2 to 5 times to obtain solid microspheres with a particle size of 40-80 μm;

[0031] S2, preparation o...

Embodiment 1

[0039] S1. Preparation of solid microspheres

[0040] A Take an appropriate amount of aluminum isopropoxide, add it to a three-necked bottle, add distilled water with a molar ratio of 110:1 to aluminum isopropoxide, stir it magnetically, and slowly add nitric acid dropwise after reflux at a constant temperature of 85°C for 4 hours to control the pH value of the solution. Between 3.5 and 5.5, reflux at constant temperature for 24 hours to obtain alumina sol;

[0041] According to the mass ratio of alumina sol to silica sol is 3:1, add silica sol and mix evenly, and treat at 55°C for 3 hours to obtain a silica-alumina composite sol with a viscosity of 28.0-33.0mPa·s;

[0042] B. Immerse polystyrene microspheres with a particle size of 20 μm in the composite sol for 30 minutes, take them out and keep them in an oven at 105 ° C for 12 hours, then soak the microspheres in the composite sol, heat and dry them, and repeat the operation 3 times to obtain the particle size Solid micro...

Embodiment 2

[0050] S1. Preparation of solid microspheres

[0051] A Take an appropriate amount of aluminum isopropoxide, add it to a three-necked bottle, add distilled water with a molar ratio of 110:1 to aluminum isopropoxide, stir it magnetically, and slowly add nitric acid dropwise after reflux at a constant temperature of 85°C for 4 hours to control the pH value of the solution. Between 3.5 and 5.5, reflux at constant temperature for 24 hours to obtain alumina sol;

[0052] According to the mass ratio of alumina sol to silica sol is 3:1, add silica sol and mix evenly, and treat at 55°C for 3 hours to obtain a silica-alumina composite sol with a viscosity of 28.0-33.0mPa·s;

[0053] B. Immerse silicone resin microspheres with a particle size of 20 μm in the composite sol for 30 minutes, take them out and keep them in an oven at 105 ° C for 12 hours, then soak the microspheres in the composite sol, heat and dry them, and repeat the operation 4 times to obtain the particle size Solid mi...

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Abstract

The invention discloses a preparation method of a closed-pore ceramic microsphere filled gradient ceramic coating. The method comprises the following steps: taking an organic resin microsphere as a core, attaching a ceramic precursor on the surface of the core to obtain a solid microsphere, performing calcining at high temperature to obtain a hollow ceramic microsphere, and mixing the hollow ceramic microsphere with a ceramic aggregate to form a ceramic coating on the surface of a matrix. According to the invention, the ceramic microspheres of the mullite (3Al2O3.2SiO2) crystalline phase are used for constructing closed pore channels in the coating, and in the spraying process, the gaps among the hollow microspheres are filled with the ceramic aggregate with small particle size, so that the compactness of the coating is effectively improved, the formation of communicated pore channels is avoided, and the ceramic coating can have lower heat conductivity and provide a better heat insulation effect.

Description

technical field [0001] The invention relates to the technical field of ceramic coatings, in particular to a gradient ceramic coating filled with closed-cell ceramic microspheres and a preparation method thereof. Background technique [0002] With the development of science and technology, many industrial equipment require metal substrates to serve in harsh environments for a long time, such as high temperature, humidity, high pressure and acid-base environments, which greatly shorten the service life of metal materials, which cannot meet the actual requirements. Production requirements. Ceramic coating has the advantages of good high temperature resistance, oxidation resistance, wear resistance, corrosion resistance, etc., and has also received extensive attention from more and more researchers and enterprises. [0003] In the case of a certain coating thickness, the thermal insulation effect of the ceramic coating is closely related to the material properties and structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B38/08C04B35/185C04B35/622C04B35/10
CPCC04B38/067C04B35/10C04B35/185C04B35/62222C04B38/08C04B2235/9607C04B2235/96C04B2235/9684
Inventor 邰召山
Owner ZHAOSHAN TECH BEIJING CO LTD
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