Method for removing strained layer on surface of single crystal blade casting through chemical milling

A single crystal blade and strain layer technology is applied in the field of chemical milling to remove the surface strain layer of single crystal blade castings, which can solve the problems of low yield, reduce the probability of the existence of the surface strain layer, reduce the incidence of recrystallization, The effect of preventing recrystallization

Inactive Publication Date: 2012-01-25
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of low yield in the preparation process of existing single crystal blades, the present invention provides a method for removing the strain layer on the surface of single crystal blade castings by chemical milling. The strained layer on the surface reduces recrystallization during heat treatment and improves the yield of single crystal blades

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Dissolving sodium hydroxide, sodium carbonate and sodium phosphate in water is prepared into degreasing liquid, the concentration of sodium hydroxide in the degreasing liquid is 10g / L, the concentration of sodium carbonate is 32g / L, and the concentration of sodium phosphate is 18g / L;

[0016] Seal the blade window of the single crystal blade casting with wax, and then place it in a degreasing solution at a temperature of 50±2°C for degreasing, and the degreasing time is 6 minutes;

[0017] Dissolve hydrochloric acid, hydrofluoric acid, nitric acid, acetic acid, ferric chloride and chromic anhydride in water to prepare chemical milling solution. The concentration of hydrochloric acid in the chemical milling solution is 220ml / L, the concentration of hydrofluoric acid is 300ml / L, nitric acid The concentration of acetic acid is 110ml / L, the concentration of acetic acid is 45ml / L, the concentration of ferric chloride is 300g / L, and the concentration of chromic anhydride is 20...

Embodiment 2

[0023] Dissolving sodium hydroxide, sodium carbonate and sodium phosphate in water is prepared into degreasing liquid, the concentration of sodium hydroxide in the degreasing liquid is 11g / L, the concentration of sodium carbonate is 31g / L, and the concentration of sodium phosphate is 19g / L;

[0024] Seal the blade window of the single crystal blade casting with wax, and then place it in a degreasing solution at a temperature of 50±2°C for degreasing, and the degreasing time is 8 minutes;

[0025] Dissolve hydrochloric acid, hydrofluoric acid, nitric acid, acetic acid, ferric chloride and chromic anhydride in water to prepare chemical milling solution. The concentration of hydrochloric acid in the chemical milling solution is 240ml / L, the concentration of hydrofluoric acid is 280ml / L, nitric acid The concentration of acetic acid is 115ml / L, the concentration of acetic acid is 44ml / L, the concentration of ferric chloride is 320g / L, and the concentration of chromic anhydride is 21...

Embodiment 3

[0031] Dissolving sodium hydroxide, sodium carbonate and sodium phosphate in water is prepared into degreasing liquid, the concentration of sodium hydroxide in the degreasing liquid is 12g / L, the concentration of sodium carbonate is 30g / L, and the concentration of sodium phosphate is 20g / L;

[0032] Seal the blade window of the single crystal blade casting with wax, and then place it in a degreasing solution at a temperature of 50±2°C for degreasing, and the degreasing time is 7 minutes;

[0033] Dissolve hydrochloric acid, hydrofluoric acid, nitric acid, acetic acid, ferric chloride and chromic anhydride in water to prepare chemical milling solution. The concentration of hydrochloric acid in the chemical milling solution is 260ml / L, the concentration of hydrofluoric acid is 250ml / L, nitric acid The concentration of acetic acid is 120ml / L, the concentration of acetic acid is 42ml / L, the concentration of ferric chloride is 330g / L, and the concentration of chromic anhydride is 20...

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PUM

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Abstract

The invention discloses a method for removing a strained layer on the surface of a single crystal blade casting through chemical milling. The method comprises the following steps of: (1) tightly plugging a blade window of the single crystal blade casting by using paraffin; (2) removing degreasing fluid on the surface by washing, and putting into chemical milling fluid for corrosion; (3) after the chemical milling is finished, putting into neutralization solution for neutralization; and (4) removing the neutralization solution on the surface by washing, and removing the paraffin which is used for plugging the blade window. In the invention, the surface of the single crystal blade casting is corroded through chemical milling treatment, so that recrystallization can be effectively prevented, rejection rates are reduced, and the method is easy to operate.

Description

technical field [0001] The invention relates to a chemical milling treatment method for a single crystal blade, in particular to a method for removing a strain layer on the surface of a single crystal blade casting by chemical milling. Background technique [0002] The production of single crystal blades generally includes pouring single crystal blade castings and heat treatment process. Before heat treatment, single crystal blade castings have deformation storage energy inside the grain due to deformation, and the structure is in an unstable high-energy state. During heat treatment, deformation The stored energy is the driving force, recrystallization nucleation through the thermal activation process, and grows into a new grain structure, so that the structure changes from a high-energy state to a relatively stable low-energy state; due to the existence of the surface strain layer of the single crystal blade casting, the single crystal The scrap rate of blades is high (≥55%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/00C23F1/28
Inventor 宁英王铁军倪伟贾石张鸿
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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