Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for removing AlSiY coating of turbine blade of engine

A technology for turbine blades and engines, applied in the field of aero-engine turbine blade repair and treatment, can solve the problems of large damage to the coating, easy damage to the substrate, and high cost, and achieve the effects of thorough coating removal, improved qualification rate, and high removal efficiency.

Active Publication Date: 2017-05-31
CHENGDU ENGINE GROUP
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex shape of the turbine blade, it is not only difficult to remove the damaged coating remaining on the surface by mechanical means, but also easily cause mechanical damage to the alloy matrix of the blade; the use of high-temperature chloride gas to remove the coating will cause great damage to the inner and outer cavity coatings, and there is no Coated tenons exposed to high-temperature halide gas environment will cause loss of alloying elements, and require the use of expensive equipment, which is expensive; using high-pressure water removal equipment to remove the residual damaged coating on the surface is also expensive, and the operation is difficult to control and easy to damage Matrix and other issues

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for removing AlSiY coating of turbine blade of engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The removal method of engine turbine blade AlSiY coating, process step is as follows:

[0027] (1) Sand blowing: Use a sand blower to blow sand on the turbine blades to remove the dirt on the coating surface of the turbine blades. Use 40-mesh alumina sand grains, the wind pressure is 0.2 MPa, and the sand blowing time is 1.5 minutes.

[0028] (2) Degreasing: Soak the turbine blades after sand blowing in a degreasing solution with a temperature of 75°C for 15 minutes to fully remove the oil stains; the components and component concentrations of the degreasing solution are: NaOH 75g / L, NaOH 2 CO 3 40g / L, Na 3 PO 4 12H 2 O 30g / L, Na 2 SiO 4 10g / L;

[0029] (3) Tenon protection: use pressure-sensitive tape to seal the diversion hole on the tenon, and then evenly brush a layer of insulating wax on the surface of the tenon. The insulating wax is a molten composition of paraffin wax, microcrystalline wax, and turpentine wax.

[0030] (4) Coating removal: Soak the tur...

Embodiment 2

[0034] The removal method of engine turbine blade AlSiY coating, process step is as follows:

[0035] (1) Sand blowing: Use a sand blower to blow sand on the turbine blades to remove the dirt on the coating surface of the turbine blades. Use 35-mesh alumina sand grains, the wind pressure is 0.25 MPa, and the sand blowing time is 1.5 minutes.

[0036] (2) Degreasing: Soak the turbine blades after sand blowing in a degreasing solution with a temperature of 70°C for 18 minutes to fully remove the oil stains; the components and component concentrations of the degreasing solution are: NaOH 50g / L, NaOH 2 CO 3 35g / L, Na 3 PO 4 12H 2 O 20g / L, Na 2 SiO 4 7g / L;

[0037] (3) Tenon protection: use electrical tape to seal the diversion holes on the tenon, and then evenly brush a layer of chemical milling protective glue on the surface of the tenon;

[0038] (4) Coating removal: Soak the turbine blade after tenon protection treatment in the pickling solution for 120 minutes, and inc...

Embodiment 3

[0041] The removal method of engine turbine blade AlSiY coating, process step is as follows:

[0042] (1) Sand blowing: Use a sand blower to blow sand on the turbine blades to remove the dirt on the coating surface of the turbine blades. Use 25 mesh alumina sand grains, the wind pressure is 0.25MPa, and the sand blowing time is 2 minutes.

[0043] (2) Degreasing: Soak the turbine blades after sand blowing in a degreasing solution with a temperature of 60°C for 10 minutes to fully remove the oil stains; the components and component concentrations of the degreasing solution are: NaOH 30g / L, NaOH 2 CO 3 30g / L, Na 3 PO 4 12H 2 O 10g / L, Na 2 SiO 4 4g / L;

[0044] (3) Tenon protection: Use pressure-sensitive tape to seal the diversion hole on the tenon, and then evenly brush a layer of molten insulating wax on the surface of the tenon. The insulating wax is a molten composition of paraffin wax, microcrystalline wax, and turpentine wax.

[0045] (4) Coating removal: Soak the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for removing an AlSiY coating of a turbine blade of an engine. The method comprises the following process steps that (1) sand blasting is conducted; (2) oil is removed, specifically, the turbine blade after sand blasting treatment is immersed in an oil removing solution, oil stains are fully cleaned out, and the components of the oil removing solution comprise, 25-75 g / L of NaOH, 30-40 g / L of Na2CO3, 10-30 g / L of Na3PO4.12H2O and 3-10 g / L of Na2SiO4; (3) a tenon is protected; and (4) the coating is removed, specifically, the turbine blade after the tenon is subjected to protective treatment is immersed in acid pickling liquid, acid pickling is conducted till the surface of the turbine blade shows uniform crystal particles and is changed in grey color, and the components of the acid pickling liquid comprise, 100-140g / L of nitric acid, 9-12 g / L of hydrofluoric acid and 5-10 g / L of chromic anhydride; and (5) a protective layer of the tenon is removed. The method can efficiently remove the AlSiY coating on the surface of the turbine blade, and meanwhile the processing difficulty is reduced.

Description

technical field [0001] The invention belongs to the technical field of aeroengine turbine blade repair treatment, and in particular relates to a method for removing an AlSiY coating on the surface of an engine turbine blade. Background technique [0002] As the engine develops towards a high thrust-to-weight ratio, the operating temperature of its core component, the turbine blade, continues to increase. In order to improve the service life of the blades, the engine turbine blades are coated with AlSiY by vacuum arc plating to enhance the resistance to high temperature oxidation and thermal corrosion. However, during the thousands of hours of service or test run of the aero-engine, the coating on the surface of the turbine components will be partially peeled off due to erosion and wear. When repairing the blade surface coating, the remaining damaged coating on the surface must be removed first. Due to the complex shape of the turbine blade, it is not only difficult to remo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/04C23F1/44
CPCC23F1/04C23F1/44
Inventor 田敏柳卫张书黎红英夏至程定春尹湘蓉曹江
Owner CHENGDU ENGINE GROUP