Method for rear wall protection in laser processing of turbine blade by using water and silicon dioxide

Abstract

The invention discloses a method for rear wall protection in laser processing of a turbine blade by using water and silicon dioxide, comprising the following steps: grinding the silicon dioxide first; then mixing the silicon dioxide with water to form paste; the paste is injected into a blade runner by virtue of a hole in the top of the turbine blade; punching by adopting pulsed laser; after punching, silicon dioxide particles in the runner are flushed out with flowing water by virtue of the hole in the top of the turbine blade; after the silicon dioxide particles are dried with hot air after being totally flushed out, the laser is scattered, reflected and diffracted by the silicon dioxide particles in front of the rear wall after penetrating through the front wall, and laser spots radiated on the rear wall become large, and the energy is reduced, thus, the power density of the laser radiated on the rear wall becomes small, and accordingly the damage of the laser to the rear wall is weakened or eliminated. The method disclosed by the invention is simple in process and low in cost.

Description

technical field [0001] The invention relates to the technical field of gas turbine blades, in particular to a method for using water-silicon dioxide as a back wall protection in laser processing of turbine blades. Background technique [0002] Used as a gas turbine rotor 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....

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 the lens, not to the turbine blades; based on the nonlinear optical limit The materials used in laser protection technology based on the principle of amplitude 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.

[0004] In addition, there is also a laser protection technology that is ablated after absorbing laser energy. After ablation, the residual carbon or silicon bond is formed. 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.

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