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Method of Laser Cladding Cemented Carbide Coating on Turbine Blade Shroud

A laser cladding and cemented carbide technology, which is applied in the coating process and coating of metal materials, can solve the problems affecting the quality of cemented carbide coating, easy to generate pores, and low cladding efficiency, so as to improve the cladding efficiency. Efficiency, avoiding porosity, improving quality effect

Active Publication Date: 2015-12-02
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: first, many procedures, long operation time and low cladding efficiency
Third, due to the use of binder, it is easy to produce pores during the cladding process, which affects the quality of the cemented carbide coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Blade cleaning: DZ125 high-temperature alloy turbine blade parallelogram blade crown meshing surface cladding hard alloy, use absorbent cotton dipped in acetone to wipe the blade to be laser cladding, remove the dirt on the laser cladding position

[0017] 2. Blade clamping: Fix the fixture on the working turntable in the protection room of the laser three-dimensional forming equipment, and then install the blade on the fixture. Cover the surface with a protective plate, the protective plate is a copper plate with a thickness of 0.4mm, use aluminum foil tape to fix the protective plate, and close the protective room;

[0018] 3. Vacuum drying of cemented carbide powder: Put CoCrMo cemented carbide powder in a vacuum oven, vacuum to ≤0.1Pa, then heat to 120°C, keep warm for 1h, and cool to room temperature with the furnace, the particle size of cemented carbide powder 100 mesh to 200 mesh;

[0019] 4. Laser cladding: CoCrMo hard alloy layer is clad on the meshing sur...

Embodiment 2

[0021] 1. Blade cleaning: DZ125 superalloy turbine blade serrated blade crown meshing surface cladding carbide, use absorbent cotton dipped in acetone to wipe the part of the blade to be laser cladding, remove the dirt on the part to be laser cladding

[0022] 2. Blade clamping: Fix the fixture on the working turntable in the protection room of the laser three-dimensional forming equipment, and then install the blade on the fixture. Cover the surface with a protective plate, the protective plate is a copper plate with a thickness of 0.8mm, use aluminum foil tape to fix the protective plate, and close the protective room;

[0023] 3. Vacuum drying of cemented carbide powder: Put CoCrMo cemented carbide powder in a vacuum oven, vacuum to ≤0.1Pa, then heat to 120°C, keep warm for 1h, and cool to room temperature with the furnace, the particle size of cemented carbide powder 100 mesh to 200 mesh;

[0024] 4. Laser cladding: CoCrMo hard alloy layer is clad on the meshing surface o...

Embodiment 3

[0026] 1. Blade cleaning: DZ125 superalloy turbine blade serrated blade crown meshing surface cladding carbide, use absorbent cotton dipped in absolute ethanol to wipe the part of the blade to be laser cladding, remove the dirt on the part to be laser cladding

[0027] 2. Blade clamping: Fix the fixture on the working turntable in the protection room of the laser three-dimensional forming equipment, and then install the blade on the fixture. Cover the surface with a protective plate, the protective plate is a copper plate with a thickness of 0.8mm, use aluminum foil tape to fix the protective plate, and close the protective room;

[0028] 3. Vacuum drying of cemented carbide powder: put CoCrW cemented carbide powder in a vacuum oven, vacuumize to ≤0.1Pa, then heat to 120°C, keep warm for 1h, and cool to room temperature with the furnace, the particle size of cemented carbide powder 100 mesh to 200 mesh;

[0029] 4. Laser cladding: CoCrW hard alloy layer is clad on the meshing...

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Abstract

The invention belongs to the technology of metal surface treatment and particularly relates to an improved method for laser cladding of a hard alloy coating on a crown of a turbine blade. Laser three-dimensional forming equipment is adopted for carrying out laser cladding on the hard alloy coating. The method comprises the following steps: cleaning the blade; clamping the blade; vacuum-drying the hard alloy powder; and carrying out laser cladding. The invention provides an improved method for laser cladding of the hard alloy coating on the crown of the turbine blade, so that the steps are simplified, the operating time is shortened and the cladding efficiency is improved. Meanwhile, the defect of pores generated in the cladding process and the like is avoided, and the quality of the hard alloy coating is improved.

Description

technical field [0001] The invention belongs to the metal surface treatment technology, and relates to the improvement of the laser cladding hard alloy coating method for the blade crown of the turbine blade. Background technique [0002] There is a shroud on the top of the turbine blade of the gas turbine, and its function is to use the friction between the shrouds to absorb vibration energy and play a role in vibration reduction. The common leaf shroud shapes are parallelogram and zigzag, and the zigzag shroud is more conducive to suppressing vibration and reducing wear between the shrouds. In order to improve the wear resistance between the working faces of the blade shroud, it is necessary to clad the hard alloy on the working face of the blade shroud. For a current coating method of laser cladding cemented carbide on turbine blade crowns, see "Application Research on Laser Cladding of Turbine Blade Sawtooth Crowns", "Gas Turbine Test and Research", Volume 15, Issue 2, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
Inventor 王辉明朱红钢耿军儒李文涛尉秧魏颖张立辉丰雷明
Owner AECC AVIATION POWER CO LTD
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