Laser cladding coating for improving water erosion resistance of brazed stellite and preparation method

A laser cladding and coating technology, applied in the direction of metal material coating process and coating, to prevent carbonization and hardening, improve water corrosion resistance, and eliminate stress concentration.

Active Publication Date: 2019-11-08
HAINAN NUCLEAR POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the key problem of water erosion resistance of steam turbine blades of nuclear power units and thermal power units, the purpose of the present invention is to provide a laser cladding coating and a preparation method to improve the water erosion resistance of brazed Stellite alloys, and further solve the problems in the laser cladding process. Improve the ability of Stellite alloy to resist water erosion, thereby greatly improving the service performance of steam turbine blades and prolonging the service life

Method used

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  • Laser cladding coating for improving water erosion resistance of brazed stellite and preparation method
  • Laser cladding coating for improving water erosion resistance of brazed stellite and preparation method
  • Laser cladding coating for improving water erosion resistance of brazed stellite and preparation method

Examples

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Effect test

Embodiment 1

[0028] (1) Select Ni625 powder with a particle size of 5m~30m and spherical WC particles with a particle size of 5m~125m, mix them uniformly and dry them at 120°C for 0.5h. Degree 1-1.5, WC particles account for 30wt% of the total mass of Ni625 powder and WC particles;

[0029] (2) Utilize acetone solution to clean the pollutants on the surface of the Stellite alloy substrate, and carry out sandblasting treatment on the surface of the Stellite alloy substrate. Clean and dry, clamp the Stellite alloy substrate on the mobile platform;

[0030] (3) Laser cladding uses Trumpf Trulaser 4006 laser for cladding. During the laser cladding process, the light output power is 1000W, the spot diameter is 5mm, the overlap is 4mm, and the laser scanning speed is 800mm / min;

[0031] (4) The powder spreading speed is 800mm / min, the powder spreading amount is 2g / min, the cooling gas flow rate is 10L / min, and the cleaning gas flow rate is 5L / min;

[0032] (5) The mixed powder is sent into the...

Embodiment 2

[0035] (1) Select 25% NiCr-Cr with a particle size of 30m ~ 80m 2 C 3 The powder and spherical WC particles with a particle size of 5m~125m are evenly mixed and dried at 100°C for 1h. Among them, the thickness of tungsten oxide on the surface of WC particles is 0.05m~1m, the ellipticity is 1~1.5, and the mass of WC particles accounts for the mass of Ni625 powder and WC 45% by weight of the total mass of the particles;

[0036] (2) Utilize acetone solution to clean the pollutants on the surface of the Stellite alloy substrate, and carry out sandblasting treatment on the surface of the Stellite alloy substrate. Clean and dry, clamp the Stellite alloy substrate on the mobile platform;

[0037] (3) Laser cladding adopts Trumpf Trulaser 4006 laser for cladding. During the laser cladding process, the light output power is 2500W, the spot diameter is 3mm, the overlapping amount is 2mm, and the laser scanning speed is 500mm / min;

[0038](4) The powder spreading speed is 500mm / min, ...

Embodiment 3

[0042] (1) Select NiCrBSi powder with a particle size of 80m~125m and spherical WC particles with a particle size of 5m~125m, mix them uniformly and dry them at 80°C for 2 hours, wherein the thickness of tungsten oxide on the surface of WC particles is 0.05m~1m, 1~1.5, the mass of WC particles accounts for 60wt% of the total mass of Ni625 powder and WC particles;

[0043] (2) Utilize acetone solution to clean the pollutants on the surface of the Stellite alloy substrate, and carry out sandblasting treatment on the surface of the Stellite alloy substrate. After sandblasting, the roughness of the Stellite alloy substrate is 10 μm. Clean and dry, clamp the Stellite alloy substrate on the mobile platform;

[0044] (3) Laser cladding adopts Trumpf Trulaser 4006 laser for cladding. During the laser cladding process, the light output power is 5000W, the spot diameter is 1mm, the overlapping amount is 1mm, and the laser scanning speed is 100mm / min;

[0045] (4) The powder spreading s...

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Abstract

The invention discloses a laser cladding coating for improving the water erosion resistance of brazed stellite and a preparation method. A coating is laser-cladded on the surface of a stellite substrate brazed on a steam turbine blade, the coating is composed of a continuous phase nickel-based alloy material and dispersion strengthening phase wolfram carbide particles, the WC particles are spherical, stress concentration caused by sharp corners is effectively eliminated, the coating cannot crack, wolfram oxide with certain thickness is arranged on the surfaces of the WC particles, excessive dissolution of a WC melted nickel-based alloy is avoided, optimum dispersion strengthening of a nickel-based alloy phase is achieved, the coating is prepared through the laser cladding technology, the efficiency is high, the operation is easy, and the prepared coating is dense, free of cracks and low in porosity. The laser cladding coating for improving the water erosion resistance of the brazed stellite and the preparation method of the laser cladding coating can be used for water-erosion-resistant coatings on the surfaces of blades of large nuclear steam turbines and thermal power steam turbines and manufacturing, repairing and re-manufacturing, the service performance of parts is effectively improved, and the service life of the parts is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of water-corrosion-resistant coatings, in particular to a laser cladding coating and a preparation method for improving the water-corrosion resistance of brazed Stellite alloys. Background technique [0002] The steam turbine blades of nuclear power units and thermal power units work under wet steam for a long time, and are extremely vulnerable to water erosion. The working temperature of each stage of steam turbine blades is different. The temperature of the first stage blades is the highest, up to about 580 ° C. , the temperature gradually decreases. When the temperature is lower than 100°C, water droplets will be generated in the steam, which will cause water erosion damage to the air intake side of the high-speed blade. As more and more units in our country carry out deep peak shaving, the units that have undergone flexible transformation have higher steam humidity during the deep peak shaving process, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C19/05C22C32/00
CPCC22C19/05C22C32/0005C23C24/103
Inventor 薛强王建军吴小亮刘福广李勇刘刚杨二娟
Owner HAINAN NUCLEAR POWER
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