High-temperature abrasive sealing coating material used for plasma spraying

A sealing coating and coating material technology, applied in coatings, powder coatings, blade support components, etc., can solve the problems of less research on sealing coatings, wearability defects of coatings, etc., and achieve grain size Small, good chemical stability and thermal shock resistance, the effect of stable performance

Inactive Publication Date: 2010-03-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature sealing coatings studied in the past are mostly based on micron ZrO 2 As the base phase, nano-ZrO 2 There are few studies on the sealing coating as the base phase
Domestically, the micron ZrO has been developed 2 High-temperature sealing coating as the base phase, but the abradability of the coating still has obvious defects under long-term service conditions

Method used

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  • High-temperature abrasive sealing coating material used for plasma spraying
  • High-temperature abrasive sealing coating material used for plasma spraying
  • High-temperature abrasive sealing coating material used for plasma spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Ingredients: Take 7.8Kg of Y-PSZ powder with a particle size of 20-60nm, and α-Al with a particle size of 15-30nm 2 o 3 1.5 Kg of powder, 0.2 Kg of hBN powder with a particle size of 0.5-2 μm, and 0.5 Kg of polyphenylene with a particle size of 6-10 μm, and mix them uniformly.

[0021] Mixing: Take 0.4kg of dextrin, add it to the raw material powder and mix thoroughly, then add 8.0Kg of distilled water, stir to form a uniformly dispersed and suspended slurry for use.

[0022] Spray granulation: Use centrifugal atomizing nozzle to atomize the slurry into fine droplets and spray them into the granulation tower. The atomizer speed is 18000-20000r / min. Drying in hot air, the temperature in the granulation tower is controlled within the range of 140-170°C, and the temperature can be adjusted so that the powder is fully dried. The dry agglomerated powder is then drawn into a cyclone separator by an aspirator for collection.

[0023] Sieving: Sieve the collected agglomerate...

Embodiment 2

[0026] Ingredients: Take 8.1Kg of Y-PSZ powder with a particle size of 20-60nm, and α-Al with a particle size of 15-30nm 2 o 3 1.0 Kg of powder, 0.3 Kg of hBN powder with a particle size of 0.5-2 μm, and 0.6 Kg of polyphenylene with a particle size of 6-10 μm, and mix them uniformly.

[0027] Mixing: Take 0.3kg of dextrin, add it to the raw material powder and mix thoroughly, then add 7.5Kg of distilled water, and stir to form a uniformly dispersed and suspended slurry for use.

[0028] Spray granulation: Use centrifugal atomizing nozzle to atomize the slurry into fine droplets and spray them into the granulation tower. The atomizer speed is 18000-20000r / min. Drying in hot air, the temperature in the granulation tower is controlled within the range of 140-170°C, and the temperature can be adjusted so that the powder is fully dried. The dry agglomerated powder is then drawn into a cyclone separator by an aspirator for collection.

[0029] Sieving: Sieve the collected agglome...

Embodiment 3

[0032] Ingredients: Take 7.5Kg of Y-PSZ powder with a particle size of 20-60nm, and α-Al with a particle size of 15-30nm 2 o 3 2.0 Kg of powder, 0.1 Kg of hBN powder with a particle size of 0.5-2 μm, and 0.4 Kg of polyphenylene with a particle size of 6-10 μm, and mix them uniformly.

[0033] Mixing: Take 0.4kg of dextrin, add it to the raw material powder and mix thoroughly, then add 8.0Kg of distilled water, stir to form a uniformly dispersed and suspended slurry for use.

[0034] Spray granulation: Use centrifugal atomizing nozzle to atomize the slurry into fine droplets and spray them into the granulation tower. The atomizer speed is 18000-20000r / min. Drying in hot air, the temperature in the granulation tower is controlled within the range of 140-170°C, and the temperature can be adjusted so that the powder is fully dried. The dry agglomerated powder is then drawn into a cyclone separator by an aspirator for collection.

[0035] Sieving: Sieve the collected agglomerate...

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Abstract

The invention relates to a high-temperature abrasive sealing coating material used for plasma spraying. According to mass percentage, the high-temperature abrasive sealing coating material is mainly prepared from the following raw materials by mass percent: 75 to 90 percent of nanometer zirconia, 5 to 20 percent of nanometer alpha-Al2O3, 1 to 3 percent of hBN and 4 to 7 percent of polybenzoate, wherein the nanometer zirconia and the nanometer alpha-Al2O3 are used as high-temperature resistant basal-phase materials, the hBN is used as a solid lubricator and the polybenzoate is used as a porecreating material. The high-temperature abrasive sealing coating material is prepared through the processing steps of blending, mixing, spraying granulation, sieving, and the like. The high-temperature abrasive sealing coating material provided by the invention has high depositing efficiency, and the coating prepared by the high-temperature abrasive sealing coating material has good high-temperaturestability, heat and shock resistance and abrasive performance, so that the coating material can be used as the coating material for sealing a turbine part, and has stable performance and good effect when used under the condition of 1000 DEG C.

Description

technical field [0001] The invention relates to a coating material, in particular to a high-temperature abradable sealing coating material which can be used for plasma thermal spraying. Background technique [0002] At present, there are more than 20 kinds of abradable sealing coatings suitable for engine sealing at home and abroad, including: low-temperature abradable sealing coatings represented by AlSi-polyester, AlSi-graphite, Ni-graphite, etc. Its operating temperature is generally below 500°C; there are medium-temperature abradable sealing coatings represented by Ni-diatomaceous earth, NiCrAl-bentonite, NiCrAl-hBN, etc., and its operating temperature is generally below 900°C. With the increase of the temperature of the compressed air of the turbine, the use temperature of the sealing coating used for the turbine part has reached 1000-1350 °C, and the thermal shock resistance, erosion resistance and chemical stability of the sealing coating have been raised. higher req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/12C09D5/03F01D5/28
Inventor 程旭东肖巍闵捷孟令娟张琦叶菲王珂李光磊
Owner WUHAN UNIV OF TECH
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