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A kind of preparation method of perovskite structure ceramic coating

A technology of perovskite structure and ceramic coating, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problem that thermal barrier coating cannot be used in high-temperature and high-speed gas scour environment, poor process controllability, Combined with the problems of low strength, it achieves the effects of excellent oxygen barrier performance, high erosion resistance and improved service life

Active Publication Date: 2017-09-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional method of preparing coatings is mainly brushing. Although this method is simple and feasible, and the cost is low, it has poor process controllability, low bonding strength, and a small range of application. It cannot be applied to thermal barrier coatings for high-temperature, high-speed gas Washing environment use

Method used

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  • A kind of preparation method of perovskite structure ceramic coating
  • A kind of preparation method of perovskite structure ceramic coating
  • A kind of preparation method of perovskite structure ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A method for preparing a perovskite-like structure ceramic coating, the specific steps of the method are as follows:

[0051] (1) Add 61.4g BaCO to the ball mill jar of planetary ball mill 3 , 7.94g Al 2 o 3 , 30.66g Yb 2 o 3 and 300g of absolute ethanol, with alumina ball milling beads as the ball milling medium, the ball to mass ratio is 4:1, the rotation speed of the ball mill is set to 400r / min, and the ball mill is 6h to obtain the mixed slurry a; after the mixed slurry a is vacuum-dried , using a 300-mesh standard inspection sieve to obtain a mixed powder with a particle size of less than 50 μm;

[0052] (2) Put the mixed powder in a crucible for a muffle furnace, set the temperature rise rate of the muffle furnace to 3°C / min, raise the temperature to 1000°C, keep it for 10h, then raise the temperature to 1500°C, keep it for 4h, and cool with the furnace to 18°C ​​to obtain powder a;

[0053] (3) Add powder a, absolute ethanol and polyvinylpyrrolidone into t...

Embodiment 2

[0063] A method for preparing a perovskite-like structure ceramic coating, the specific steps of the method are as follows:

[0064] (1) Add 62.43g BaCO to the ball mill jar of planetary ball mill 3 , 8.07g Al 2 o 3 , 29.5g Yb 2 o 3 and 300g of absolute ethanol, with alumina ball milling beads as the ball milling medium, the ball to mass ratio is 4:1, the rotation speed of the ball mill is set to 400r / min, and the ball mill is 6h to obtain the mixed slurry a; after the mixed slurry a is vacuum-dried , using a 300-mesh standard inspection sieve to obtain a mixed powder with a particle size of less than 50 μm;

[0065] (2) Place the mixed powder in a crucible for a muffle furnace, set the temperature rise rate of the muffle furnace to 6°C / min, raise the temperature to 1200°C, keep it for 8 hours, then raise the temperature to 1600°C, keep it for 3 hours, and cool with the furnace to 25°C to obtain powder a;

[0066] (3) Add powder a, absolute ethanol and polyvinylpyrrolido...

Embodiment 3

[0076] A method for preparing a perovskite-like structure ceramic coating, the specific steps of the method are as follows:

[0077] (1) Add 62.43g BaCO to the ball mill jar of planetary ball mill 3 , 8.07g Al 2 o 3 、29.50Dy 2 o 3 and 300g of absolute ethanol, with alumina ball milling beads as the ball milling medium, the ball to mass ratio is 4:1, the rotation speed of the ball mill is set to 400r / min, and the ball mill is 6h to obtain the mixed slurry a; after the mixed slurry a is vacuum-dried , using a 300-mesh standard inspection sieve to obtain a mixed powder with a particle size of less than 50 μm;

[0078] (2) Put the mixed powder in a crucible for a muffle furnace, set the temperature rise rate of the muffle furnace to 5°C / min, raise the temperature to 1300°C, keep it for 6h, then raise the temperature to 1560°C, keep it for 2.5h, Cool to 30°C to obtain powder a;

[0079] (3) Add powder a, absolute ethanol and polyvinylpyrrolidone into the ball milling tank, us...

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Abstract

The invention discloses a method for preparing a perovskite-like structure ceramic coating, which belongs to the technical field of thermal barrier coatings. According to the method, BaCO3, Al2O3, R2O3 and dispersant are added to a ball mill tank, ball milled, dried, and screened to obtain a mixed powder with a particle size of less than 50 μm; the mixed powder is pre-calcined at 1200 ° C for 8 hours, and the temperature is raised to 1560 ° C for high-temperature roasting After cooling for 2.5 hours, powder a was obtained; powder a, dispersant and binder were added to a ball milling tank, ball milled, dried, mechanically crushed, and screened to obtain powder b; acetone was used as a dispersant to obtain powder b Cleaning is carried out to remove the residual binder in the powder, dried and screened to obtain the powder c; the bonding layer is obtained on the stainless steel substrate by plasma spraying; the powder c is obtained by plasma spraying or oxyacetylene spraying process It is sprayed on the bonding layer to obtain the perovskite-like structure ceramic coating. The method has good controllability, high production efficiency and low cost, and the obtained coating has high bonding strength with the substrate.

Description

technical field [0001] The invention relates to a method for preparing a perovskite-like structure ceramic coating, which belongs to the technical field of thermal barrier coatings. Background technique [0002] Modern aero-engines are constantly developing towards high thrust, high efficiency, low fuel consumption and long life. Therefore, increasing the inlet temperature of the turbine is an important way to increase the thrust of the engine. At present, the inlet temperature of turbine engines in foreign countries has reached 1400-1500°C. With the increase of temperature, the accompanying difficulty is that the heat resistance of the metal materials of the high-temperature components at the hot end of the turbine engine cannot meet the requirements of long-term stable work at high temperatures. To overcome this problem, thermal spraying technology can be used to prepare thermal barrier coatings on the surface of high-temperature turbine components to reduce the operating ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/11C23C4/073C04B35/50C23C4/134C23C4/129
Inventor 刘玲马壮王富耻张周伟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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