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 coati

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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Example Embodiment

[0023] Example 1

[0024] An alumina-titanium dioxide coating removal technology for engine titanium alloy grate disc parts includes immersing the engine titanium alloy grate disc parts in a strong alkaline solution for 20 minutes by using a hanging tool for chemical degreasing. The solution contains 10g / L sodium hydroxide, 22g / L sodium carbonate, 50g / L trisodium phosphate and 15g / L water glass. The temperature of the solution is controlled at 80℃; the parts after chemical degreasing Wash the parts with warm water and cold water at 45°C in turn. The water film on the surface of the parts after washing is kept continuous within the time range of 10~30S; the washed parts are immersed in concentrated nitric acid with a concentration of 500g / L for 20h using a hanging tool. The temperature of the concentrated nitric acid is controlled at 50°C, during which the parts are taken out every 2 hours to brush off the surface of the alumina-titania coating; the surface of the parts after acid...

Example Embodiment

[0028] Example 2

[0029] A technology for removing aluminum oxide-titanium dioxide coatings on engine solid-melted high-temperature alloy (GH4169) grate disc parts, including immersing the engine solid-melted high-temperature grate disc parts in a strong alkaline solution for 30 minutes by using a hanging tool Degreasing, the strong alkaline solution contains 15g / L sodium hydroxide, 25g / L sodium carbonate, 70g / L trisodium phosphate and 20g / L water glass, and the temperature of the solution is controlled at 90°C ;Wash the parts after chemical degreasing with warm water and cold water at 45℃ in turn, and the water film on the surface of the parts after washing will keep continuous within the time range of 10~30S; use hanging tooling to immerse the washed parts into the part immersion concentration In 433g / L concentrated nitric acid for 15h, the temperature of the concentrated nitric acid is controlled at 58℃, during which the parts are taken out every 2h to brush off the surface o...

Example Embodiment

[0032] Example 3

[0033] An alumina-titanium dioxide coating removal technology for engine high-strength superalloy (GH4169) sprocket disc parts, including organic solvent degreasing on the engine's high-strength superalloy sprocket disc parts with acetone; using hanging tooling The organic solvent degreasing parts are immersed in a strong alkaline solution for 30 minutes for chemical degreasing. The strong alkaline solution contains sodium hydroxide at a concentration of 5g / L, sodium carbonate at 20g / L, and triphosphate of 30g / L. Sodium and 10g / L water glass, the temperature of the solution is controlled at 70℃; the parts after chemical degreasing are washed with warm water and cold water at 40~50℃ in sequence, and the water film on the surface of the washed parts is in the time range of 10~30S Keep the inside continuous; use hanging tooling to immerse the washed parts in concentrated nitric acid with a concentration of 345g / L for 15h. The temperature of the concentrated nitric...

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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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