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Technique for removing alumina-titanium dioxide coating of engine labyrinth disc type part

The technology of disc parts and titanium dioxide is applied in the field of removing aluminum oxide-titanium dioxide coating of engine grate disc parts, which can solve the problems of non-destructive inspection of grate teeth by technicians, damage of grate teeth coating, and scrapping of parts, etc. Achieving the effect of avoiding the risk of scrap parts, extending the service life and high work efficiency

Active Publication Date: 2017-05-31
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two problems in the maintenance process of the engine: one is that the existence of the coating will affect the non-destructive inspection of the grate teeth by technicians; the other is that the partial coating of individual grate teeth is damaged to varying degrees. The coating needs to be removed and re-sprayed
Conventionally, mechanical turning is used to remove the coating. Due to the dimensional accuracy and shape characteristics of the grate teeth, it is easy to damage the grate teeth during lathing and cause the parts to be scrapped. There is a great risk

Method used

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  • Technique for removing alumina-titanium dioxide coating of engine labyrinth disc type part
  • Technique for removing alumina-titanium dioxide coating of engine labyrinth disc type part
  • Technique for removing alumina-titanium dioxide coating of engine labyrinth disc type part

Examples

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Effect test

Embodiment 1

[0024] A technology for removing aluminum oxide-titania coatings on titanium alloy grate discs for engines, including using hanging tooling to immerse titanium alloy grate discs for engines in a strong alkaline solution for 20 minutes for chemical degreasing. The solution contains sodium hydroxide at a concentration of 10g / L, sodium carbonate at 22g / L, trisodium phosphate at 50g / L and water glass at 15g / L, and the temperature of the solution is controlled at 80°C; parts after chemical degreasing Rinse with warm water and cold water at 45°C in turn, and the water film on the surface of the washed parts will remain continuous within 10 to 30 seconds; use a hanging tool to immerse the washed parts in concentrated nitric acid with a concentration of 500g / L for 20 hours, The temperature of concentrated nitric acid was controlled at 50°C, during which the parts were taken out every 2 hours to brush off the surface of the alumina-titania coating; the surface of the parts after picklin...

Embodiment 2

[0029] A technology for removing the alumina-titanium dioxide coating on engine solid-melt superalloy (GH4169) grate tooth disc parts, including using hanging tooling to immerse the solid-melt high-temperature grate tooth disc parts of the engine in a strong alkaline solution for 30 minutes for chemical Degreasing, containing the sodium hydroxide that concentration is 15g / L, the sodium carbonate of 25g / L, the trisodium phosphate of 70g / L and the water glass of 20g / L in the strong alkaline solution, the temperature of solution is controlled at 90 ℃ ; Rinse the parts after chemical degreasing with warm water and cold water at 45°C in sequence, and the water film on the surface of the washed parts will remain continuous within the time range of 10~30S; 433g / L concentrated nitric acid for 15 hours, the temperature of the concentrated nitric acid was controlled at 58°C, during which the parts were taken out every 2 hours to brush the surface of the alumina-titania coating; the surfa...

Embodiment 3

[0033]A technology for removing the alumina-titania coating on high-strength superalloy (GH4169) grate tooth disc parts of an engine, including using acetone to degrease the engine high-strength superalloy superalloy grate tooth disc parts with an organic solvent; Immerse the parts degreased by organic solvents in a strong alkaline solution for 30 minutes for chemical degreasing. Sodium and 10g / L water glass, the temperature of the solution is controlled at 70°C; the parts after chemical degreasing are washed with warm water and cold water at 40~50°C in sequence, and the water film on the surface of the washed parts is in the time range of 10~30S The interior is kept continuous; the washed parts are immersed in concentrated nitric acid with a concentration of 345g / L for 15 hours by hanging tooling, and the temperature of the concentrated nitric acid is controlled at 65°C. Surface brushing; use a pressure water gun to rinse the surface of the pickled part until the alumina-tita...

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Abstract

The invention provides a technique for removing an alumina-titanium dioxide coating of an engine labyrinth disc type part. The technique includes the steps that the engine labyrinth disc type part is immersed in a strong alkaline solution for 20-30 minutes by a hanging tool for chemical oil removal; the part which is subjected to chemical oil removal is sequentially washed with warm water at 40-50 DEG C and cold water; the washed part is immersed into concentrated nitric acid with the concentration of 345-520 g / L by the hanging tool for 6-24 hours, and the part is taken out every two hours to remove the alumina-titanium dioxide coating on the surface in a brushing mode; and the surface of the acid-immersed part is flushed till the alumina-titanium dioxide coating is completely removed. The technique can be widely applied to coating repair of the engine labyrinth disc part, the repairing period of the part is greatly prolonged, and the percent of pass is up to 100%.

Description

technical field [0001] The invention relates to a coating removal technology for engine parts, in particular to an alumina-titania coating removal technology for engine grate disc parts. Background technique [0002] The first to ninth stage wheels of the engine and their welded components are all part of the grate tooth disc. In order to improve its wear resistance, the alumina-titanium dioxide wear-resistant protective coating is sprayed on the grate teeth. There are two problems in the maintenance process of the engine: one is that the existence of the coating will affect the non-destructive inspection of the grate teeth by technicians; the other is that the partial coating of individual grate teeth is damaged to varying degrees. The coating needs to be removed and re-sprayed. Conventionally, mechanical turning is used to remove the coating. Due to the dimensional accuracy and shape characteristics of the grate teeth, it is easy to damage the grate teeth during turning a...

Claims

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Application Information

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IPC IPC(8): C23G1/02
CPCC23G1/02
Inventor 王辉滕志强杨树林郭春光王博
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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