Ultrahigh-temperature thermal barrier coating hollow-structured powder, preparation and application methods thereof and ultrahigh-temperature thermal barrier coating

A heating and coating technology, applied in the field of materials, can solve the problems of easy adsorption and poor fluidity, and achieve the effects of good powder fluidity, good dispersion effect and high production efficiency

Active Publication Date: 2018-09-14
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanoscale gadolinium zirconate fine powder can improve the overall performance of thermal barrier coatings, but it cannot be directly used for thermal spraying to prepare coatings due to the disadvantages of poor fluidity and easy adsorption.

Method used

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  • Ultrahigh-temperature thermal barrier coating hollow-structured powder, preparation and application methods thereof and ultrahigh-temperature thermal barrier coating
  • Ultrahigh-temperature thermal barrier coating hollow-structured powder, preparation and application methods thereof and ultrahigh-temperature thermal barrier coating
  • Ultrahigh-temperature thermal barrier coating hollow-structured powder, preparation and application methods thereof and ultrahigh-temperature thermal barrier coating

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preparation example Construction

[0032] The preparation method of the hollow structure powder for ultra-high temperature thermal barrier coating provided by the embodiment of the present invention includes the following steps: mixing gadolinium zirconate raw materials, dispersant and binder to obtain gadolinium zirconate slurry, and spraying the gadolinium zirconate slurry Granulated into micron-sized agglomerated powder. Among them, spray granulation is the use of temperature-assisted evaporation treatment of spray granulation equipment to obtain micron-sized agglomerated powder.

[0033] For reference, the raw material of gadolinium zirconate in the embodiment of the present invention uses nano-grade gadolinium zirconate powder. Compared with micron-scale gadolinium zirconate powder, nano-scale gadolinium zirconate powder can effectively improve the preparation efficiency and uniformity of the thermal barrier coating. In addition, compared with conventional coatings, coatings prepared by nano-powders have hig...

Embodiment 1

[0055] Gadolinium zirconate powder of different particle sizes with a particle size of 5-15 nm is mixed with deionized water in a mass ratio of 7:13, and then added to a planetary ball mill for ball milling.

[0056] Then it was mixed with polyacrylic acid and ball milling medium, and rotated forward for 0.8h at a speed of 200r / min, then paused for 0.4h, and then reversed for 0.8h to obtain the first slurry. Among them, the ball milling medium also includes zirconia balls with a number ratio of 8:4:1 and particle sizes of 6mm, 10mm, and 20mm. The mass ratio of polyacrylic acid to gadolinium zirconate powder is 3:100, and the mass ratio of ball milling medium to gadolinium zirconate powder is 1:1.

[0057] Mix the first slurry with polyvinylpyrrolidone, rotate forward for 0.8h at a speed of 200r / min, then pause for 0.4h, and then reverse for 0.8h to obtain the second slurry. The mass ratio of polyvinylpyrrolidone to gadolinium zirconate powder is 3:100.

[0058] The second slurry wa...

Embodiment 2

[0061] Gadolinium zirconate powder with a particle size of 15 nm is mixed with deionized water in a mass ratio of 9:11, and then added to a planetary ball mill for ball milling.

[0062] Then it was mixed with polyacrylic acid and ball milling medium, and rotated forward for 1.5 hours at a speed of 400r / min, then paused for 1 hour, and then reversed for 1.5 hours to obtain the first slurry. Among them, the ball milling medium also includes zirconia balls with a number ratio of 8:4:1 and particle sizes of 6mm, 10mm, and 20mm. The mass ratio of polyacrylic acid to gadolinium zirconate powder is 10:100, and the mass ratio of ball milling medium to gadolinium zirconate powder is 4:1.

[0063] Mix the first slurry with polyvinylpyrrolidone, rotate forward for 1.5h at a speed of 400r / min, then pause for 1h, and then reverse for 1.5h to obtain the second slurry. The mass ratio of polyvinylpyrrolidone to gadolinium zirconate powder is 12:100.

[0064] The second slurry was spray dried and ...

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Abstract

The invention relates to an ultrahigh-temperature thermal barrier coating hollow-structured powder, preparation and application methods thereof and an ultrahigh-temperature thermal barrier coating andbelongs to the field of materials. The preparation method of the ultrahigh-temperature thermal barrier coating hollow-structured powder comprises mixing gadolinium zirconate materials, dispersant andbonder and performing spray pelletizing to obtain micron-sized agglomerated powder. The preparation method of the ultrahigh-temperature thermal barrier coating hollow-structured powder is rapid in drying process, high in production efficiency, capable of directly drying powder, simple in technological parameter adjustment, large in productivity and high in product quality. The prepared ultrahigh-temperature thermal barrier coating hollow-structured powder is uniform in granularity, controllable in granularity distribution range, good in fluidity, easy to enter the center of plasma flames to form stable jet flows and accordingly excellent in coating applicability. When the ultrahigh-temperature thermal barrier coating hollow-structured powder is applied to producing thermal barrier coatings of engine parts, the engine parts can better adapt to severe working environments with high temperature, high pressure and strong corrosion. The ultrahigh-temperature thermal barrier coating containing the ultrahigh-temperature thermal barrier coating hollow-structured powder is high in bonding strength, uniform in pore distribution and long in thermal resistance cycle life.

Description

Technical field [0001] The invention relates to the field of materials, and in particular to a hollow structure powder for an ultra-high temperature thermal barrier coating, a preparation method and application thereof, and an ultra-high temperature thermal barrier coating. Background technique [0002] With the development of aviation gas turbine engines in the direction of high flow ratio, high thrust-to-weight ratio, and high inlet temperature, the gas temperature and pressure in the combustion chamber continue to increase. However, the existing superalloy and cooling technology cannot meet the needs. Therefore, development Thermal barrier coating technology is an inevitable development trend. Thermal barrier coatings (TBCs), also known as thermal barrier coatings, are ceramic protective coatings that deposit ceramic materials on the surface of high-temperature alloy hot-end parts through a coating process (such as atmospheric plasma spraying) to isolate the parts from high-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622C04B35/626C04B35/634
CPCC04B35/48C04B35/62222C04B35/62695C04B35/63404C04B35/63444
Inventor 朱仁波毛杰邹俭鹏刘敏邓畅光邓春明邓子谦殷建安
Owner GUANGDONG INST OF NEW MATERIALS
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