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A thermal insulation coating slurry for aerospace engine components and a coating method for the slurry

A technology of aerospace engine and thermal insulation coating, which is applied in coating, device for coating liquid on surface, surface pretreatment, etc., can solve the problems of easy peeling off sintering, high solid content, complex shape, etc. Feasible, simple preparation process and good bonding performance

Active Publication Date: 2019-09-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the heat-insulating coating dedicated to the engine has the characteristics of high solid content (generally 40-70%) and high viscosity. At the same time, the inner surface of the turbine spherical shell, the turbine disk and other components have complex shapes, resulting in uneven sintering stress. Therefore, the existing The dip coating process also has problems such as uneven coating and easy peeling off after sintering.

Method used

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  • A thermal insulation coating slurry for aerospace engine components and a coating method for the slurry
  • A thermal insulation coating slurry for aerospace engine components and a coating method for the slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] First soak the workpiece in the mixed acidic solution for 6 minutes, the composition of the acidic solution is 5wt% hydrochloric acid, 3wt% nitric acid, 1wt% oxalic acid, and the rest is water. Soak in 2% sodium hydroxide solution for 3 minutes after pickling. Check for oil removal after soaking.

[0049] After degreasing, sand blasting, choose mixed new quartz sand with a particle size of 0.2-1mm; after sand blasting, clean the surface burrs, and blow off the dust attached to the blasting surface with compressed air. According to the mass ratio of the mixed new quartz sand, A particle size quartz sand: B particle size quartz sand=80%: 20%, the particle size of the A particle size quartz sand is 0.25 mm; the B particle size quartz sand The particle size is 0.5 mm.

[0050]Put the part on the hanger, completely immerse it in the water-based slurry tank at a speed of 0.1m / s through the transmission chain, and keep it for 1min, then lift the part out of the dip coating t...

Embodiment 2

[0054] First soak the workpiece in the mixed acidic solution for 10 minutes, the composition of the acidic solution is 4wt% hydrochloric acid, 5wt% nitric acid, 2wt% oxalic acid, and the rest is water. Soak in 1% sodium hydroxide solution for 5 minutes after pickling. Check for oil removal after soaking.

[0055] After degreasing, sand blasting, choose mixed new quartz sand with a particle size of 0.5-1mm; after sand blasting, clean the surface burrs, and blow off the dust attached to the sand blowing surface with compressed air. According to the mass ratio of the mixed new quartz sand, A particle size quartz sand: B particle size quartz sand=70%: 30%, the particle size of the A particle size quartz sand is 0.21 mm; the B particle size quartz sand The particle size is 0.425 mm.

[0056] Put the part on the hanger, completely immerse it in the water-based slurry tank at a speed of 0.05m / s through the transmission chain, and keep it for about 2min, then lift the part out of th...

Embodiment 3

[0060] First soak the workpiece in the mixed acidic solution for 20 minutes, the composition of the acidic solution is 6wt% hydrochloric acid, 2wt% nitric acid, 1wt% oxalic acid, and the rest is water. Soak in 1% sodium hydroxide solution for 1 min after pickling. Check for oil removal after soaking.

[0061] After degreasing, sand blasting, choose mixed new quartz sand with a particle size of 0.3-1mm; after sand blasting, clean the surface burrs, and use compressed air to blow off the dust attached to the sand blowing surface. According to the mass ratio of the mixed new quartz sand, A particle size quartz sand: B particle size quartz sand=60%: 40%, the particle size of the A particle size quartz sand is 0.25 mm; the B particle size quartz sand The particle size is 0.5 mm.

[0062] Put the part on the hanger, completely immerse it in the water-based slurry tank at a speed of 0.2m / s through the transmission chain, and keep it for about 3 minutes, then lift the part out of th...

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Abstract

The invention relates to heat insulation coating slurry of an airspace engine component and a coating method of the slurry. The slurry is prepared by uniformly mixing a solid part and a liquid part. The solid part is prepared from the following ingredients in percentage by mass: 10 to 25 percent of Al2O3, 25 to 40 percent of BaO, 13 to 30 percent of B2O3, 20 to 40 percent of CeO2, 1 to 5 percent of ZrO2 and 1 to 5 percent of Cr2O3. The viscosity of the slurry detected by using a coating-4 viscometer according to a GB1723-79 international detection method is 10 to 25 seconds. The coating method comprises the steps of firstly performing oil coating activation and sandblasting treatment on a pre-plated element; then, performing soaking coating, rotation leveling, sintering curing and the like. The high-temperature-resistant uniform and stable coating is obtained on the surface of the engine part. The bonding intensity between the high-temperature coating and the part is not lower than 10MPa; a peeling phenomenon cannot occur in the high-temperature airflow erosion application environment.

Description

technical field [0001] The invention relates to a thermal insulation coating slurry for aerospace engine components and a coating method for the slurry, belonging to the technical field of high-temperature oxidation-resistant coatings. Background technique [0002] Engine components work in high temperature and high pressure gas erosion environment, and must be protected by heat insulation coating. There are two main methods of coating application: spray coating and dip coating. For components with complex shapes, such as spherical turbine shells and turbine disks, it is difficult to apply a uniform coating when the surface is coated with a thermal insulation coating by spraying. The specific manifestations are: the heat insulation coating of the engine has high requirements on the process operation, and the precise control of the spray gun is very difficult. During the use of the spray gun, it is easy to cause poor leveling of the coating, obvious graininess, and the dead ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D7/61B05D3/02B05D3/08B05D3/10B05D3/12B05D5/00
Inventor 古一曾凡浩夏长清
Owner CENT SOUTH UNIV