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Multiple low-temperature aluminizing technology for steel blade of aircraft engine

An aero-engine and aluminizing technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of reducing the fatigue strength of the blade, the decrease of fatigue strength, and the failure of the fatigue strength blade to continue to use, etc., to achieve The effect of saving money

Inactive Publication Date: 2003-06-04
中国人民解放军第5719工厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because low-temperature aluminizing will reduce the fatigue strength of the blade, it is concluded that after the first low-temperature aluminizing, the fatigue strength of the blade will decrease by about 8%.
This is a large decline. Calculated according to any kind of increasing law, the blade needs to undergo low-temperature aluminizing for many times, and the decrease of its fatigue strength will make the blade no longer usable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] 1. Use a chemical cleaning solution to remove the aluminized composite coating from the engine steel blades that have undergone low-temperature aluminized once.

[0038] (1) Preparation of chemical cleaning solution:

[0039] Inject 250kg of tap water into a large enough stainless steel container, add 2.0kg of sodium oxalate into the stainless steel container, after it dissolves, add 15kg of sodium hydroxide to stir, wait until it dissolves and stir evenly, add 10kg of sodium nitrate while it is hot, wait After the solution was cooled to room temperature, 5 kg of potassium permanganate was added, stirred evenly, and then 218 kg of water was added to obtain 500 kg of aluminized composite layer cleaning solution.

[0040] (2) Put the cleaning solution with the above weight and composition in an A3 steel tank heated by a steam pipe and equipped with a draft system, and put the steel working blades to be cleaned of the aluminized layer into a stainless steel basket and subm...

example 2

[0055] 1. Remove the engine steel blades that have been aluminized three times with chemical cleaning solution.

[0056] (1) Preparation of chemical cleaning solution:

[0057] Inject 250kg of tap water into a large enough stainless steel container, add 8kg of sodium citrate into the stainless steel container, after it dissolves, add 100kg of potassium hydroxide and stir, wait for it to dissolve and stir evenly, then add 50kg of potassium nitrate while it is hot, After the solution was cooled to room temperature, 20 kg of potassium permanganate was added, stirred evenly, and then 72 kg of tap water was added to obtain 500 kg of aluminized composite layer cleaning solution.

[0058] (2) Put the cleaning solution with the above weight and composition in an A3 steel tank heated by an electric heating tube and equipped with a ventilation system, and put the steel working blades to be cleaned of aluminized steel into a stainless steel basket, and submerge them in the cleaning solut...

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PUM

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Abstract

Scavenger liquid is prepared based on the provided formula and the blade with aluminizing layer eliminated is low temperature aluminized again. The low temperature aluminizing process has the technological measures of vacuum pumping and stepped temperature maintenance,the steel blade has less fatigue strength reduction during low temperature aluminizing, so that the technological steps of repeated elimination and aluminizing may be adopted.

Description

Technical field: [0001] The invention relates to a multiple low-temperature aluminizing process for steel blades of aero-engines. Background technique: [0002] In order to improve the anti-corrosion performance of aero-engine steel blades and prolong the interval between the first overhaul of the engine, a low-temperature aluminizing + silicate surface composite coating process for steel blades has been adopted. This measure only solves the anti-corrosion problem of the blade in the first turning period. The engine can only be used for one overhaul time limit without overhaul, and it must be overhauled several times if it is to be reliably used to the specified total life. However, because low-temperature aluminizing will reduce the fatigue strength of the blade, it is concluded that after the first low-temperature aluminizing, the fatigue strength of the blade decreases by about 8%. This is a very large decline. Calculated according to any kind of increasing law, the bla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/02C23C10/08C23C10/50C23F1/32
Inventor 向巧张铀幸泽宽李银光陶洪兵于希平黄耀祖徐志怀
Owner 中国人民解放军第5719工厂