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Rear wall protection method for taking ice-carbon powder mixer as turbine blade for laser processing

A turbine blade and laser processing technology, which is applied to turbines, metal processing, laser welding equipment and other directions, can solve the problems of complex preparation process, high cost, easy agglomeration of nanoparticles, etc., and achieves easy filling process, low cost and simple preparation process. easy effect

Inactive Publication Date: 2015-07-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, laser protection technology is mainly aimed at anti-laser reinforcement of human eyes and optical sensors. The protection principles include laser protection technology based on the principle of linear optics, laser protection technology based on the principle of nonlinear optics, and laser protection technology based on the principle of phase change. The laser protection technology based on the principle of linear optics is to coat a layer of film on the lens to selectively increase the reflectivity of a certain wavelength of light. This method is only applicable to lenses, not to turbine blades; based on nonlinear light The materials used in laser protection technology based on the limiting principle mainly include noble metal nanoparticles (such as Ag, Au, Pt and other nanoparticles), graphene, carbon nanotubes, and organic nonlinear materials (such as phthalocyanine, porphyrin, thiophene, etc.). The common disadvantages are complex preparation process, high cost, easy aggregation of nanoparticles, poor thermal stability of organic matter, etc.
In addition, there is also a laser protection technology that is ablated after absorbing laser energy. After ablation, there are residual carbon or silicon bonds. However, the labyrinth structure of the turbine blade makes it difficult to remove the ablation residue, which affects the subsequent use of the turbine blade.

Method used

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  • Rear wall protection method for taking ice-carbon powder mixer as turbine blade for laser processing
  • Rear wall protection method for taking ice-carbon powder mixer as turbine blade for laser processing
  • Rear wall protection method for taking ice-carbon powder mixer as turbine blade for laser processing

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Effect test

Embodiment 1

[0022] Using ice-carbon powder mixture as a back wall protection method for laser machining of turbine blades includes the following steps:

[0023] 1) mixing carbon powder particles with a particle size range of 1-6 μm and water to prepare a carbon-water suspension with a mass fraction of carbon of 62%;

[0024] 2) Plug the hole at the bottom of the turbine blade with a rubber stopper, then pour the carbon-water suspension into the blade flow channel through the hole at the top of the turbine blade until it is full;

[0025] 3) Place the turbine blades filled with the carbon-water suspension in a freezer at a temperature of -12°C to freeze. After the water in the carbon-water suspension of the turbine blades freezes into ice, the filling of the protective material is completed;

[0026] 4) Place the turbine blade in an environment of -3°C, and use pulsed laser irradiation to drill holes. The process parameters of pulsed laser drilling are: frequency 70Hz, pulse width 0.2ms, p...

Embodiment 2

[0030] Using ice-carbon powder mixture as a back wall protection method for laser machining of turbine blades includes the following steps:

[0031] 1) mixing carbon powder particles with a particle size range of 9-17 μm and water to prepare a carbon-water suspension with a mass fraction of carbon of 3%;

[0032] 2) Plug the hole at the bottom of the turbine blade with a rubber stopper, then pour the carbon-water suspension into the blade flow channel through the hole at the top of the turbine blade until it is full;

[0033] 3) Place the turbine blades filled with the carbon-water suspension in a freezer at -3°C to freeze. After the water in the carbon-water suspension of the turbine blades freezes into ice, the filling of the protective material is completed;

[0034] 4) Place the turbine blade in an environment less than 0°C, and use pulsed laser irradiation to drill holes. The process parameters of pulsed laser drilling are: frequency 70Hz, pulse width 0.2ms, peak power 16...

Embodiment 3

[0038] Using ice-carbon powder mixture as a back wall protection method for laser machining of turbine blades includes the following steps:

[0039] 1) mixing carbon powder particles with a particle size range of 5-10 μm and water to prepare a carbon-water suspension with a mass fraction of carbon of 20%;

[0040] 2) Plug the hole at the bottom of the turbine blade with a rubber stopper, then pour the carbon-water suspension into the blade flow channel through the hole at the top of the turbine blade until it is full;

[0041] 3) Place the turbine blades filled with the carbon-water suspension in a freezer at -8°C to freeze. After the water in the carbon-water suspension of the turbine blades freezes into ice, the filling of the protective material is completed;

[0042] 4) Place the turbine blade in an environment of -4°C, and use pulsed laser irradiation to drill holes. The process parameters of pulsed laser drilling are: frequency 70Hz, pulse width 0.2ms, peak power 16KW; ...

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Abstract

The invention discloses a rear wall protection method for taking an ice-carbon powder mixer as a turbine blade for laser processing. The rear wall protection method comprises the following steps: carbon powder and water are mixed and stirred to prepare carbon water suspension; a hole in the bottom end of the turbine blade is plugged, and the carbon water suspension is poured into a blade runner through a hole in the top end of the turbine blade; the turbine blade filled with the carbon water suspension is arranged into a freezing chamber for freezing; after the water in the carbon water suspension of the turbine blade is condensed into ice, filling of a protection material is completed; the turbine blade is put into an environment with the temperature below 0 DEG C and is perforated by pulse type laser radiation; after perforation, a plug body is taken out, and the turbine blade is immersed into boiled water; after the ice is melted, residual carbon powder in the blade runner is flushed out by running water through the hole in the top end of the turbine blade; after the carbon powder is completely flushed away, the turbine blade is dried by hot air. The technology is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of gas turbine blades, in particular to an ice-carbon powder mixture used as a rear wall protection method for laser processing of turbine blades. Background technique [0002] Used as a gas turbine blade, it works in an environment of high-speed rotation and high-temperature gas action, and is subjected to huge centrifugal force, oxidation, and corrosion. Those rear wall positions damaged by laser are easy to be corroded or form stress centers and reduce the service life of the blade, so laser protection for the rear wall is required. [0003] At present, laser protection technology is mainly aimed at anti-laser reinforcement of human eyes and optical sensors. The protection principles include laser protection technology based on the principle of linear optics, laser protection technology based on the principle of nonlinear optics, and laser protection technology based on the principle of phase change. The...

Claims

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Application Information

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IPC IPC(8): B23K26/382
CPCB23K26/38B23K2101/001
Inventor 王恪典袁新董霞王文君吕静凡正杰段文强
Owner XI AN JIAOTONG UNIV
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