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.
CN110424010AActive Publication Date: 2019-11-08HAINAN NUCLEAR POWER +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HAINAN NUCLEAR POWER
Publication Date
2019-11-08

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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.
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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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