Water turbine flow passage component wear-resistant coating spraying method
A technology for flow-passing parts and water turbines, applied in coating, metal material coating process, molten spraying, etc., can solve the problems of low bonding strength and shedding, and achieve the effects of low porosity, compact structure and flexible operation
Active Publication Date: 2015-04-08
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology
However, the bonding strength of this method is low, and after a period of service, it often falls off in a large area
[0006] 3) Superelastic soft anti-wear coating, the coating prepared by this method has high anti-wear performance, but the coating also has the problem of low bonding strength
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[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0029] The top cover of a hydro turbine in a power plant (the outer diameter of the spraying area is 3710mm, the inner diameter is 2655mm, and the area of the spraying area is 5.71m 2 ) spraying, first of all, the top cover of the water turbine is sandblasted with brown corundum, the particle size of brown corundum is 16 mesh, and the gas pressure is 0.4MPa. Such as figure 1 As shown, the flame gun with high energy density and the supersonic flame gun are installed on the robot together, and the robot is used for spraying. According to the shape of the top cover, the robot walking program is compiled. The walking speed of the robot carrying the spray gun and the flame gun is 700mm / s ; WC cermet powder with a particle size distribution of 10-45μm is used as the coating material. Before spraying, the powder is dried in an oven at 120...
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Abstract
The invention relates to a water turbine flow passage component wear-resistant coating spraying method. A method of utilizing a high-energy density flamer-assisted activate combustion-high velocity air fuel spray (AC-HVAF) is adopted to spray. The method comprises the following specific steps of: 1, drying coating material ceramic metal powder; 2, carrying out blasting treatment on a water turbine flow passage component which needs to be sprayed through adopting carborundum, brown aluminium oxide or white corundum; 3, adopting the high-energy density flamer to preheat the surface of the water turbine flow passage component after blasting treatment to be 80-100 DEG C; and 4, adopting the high-energy density flamer to preheat the surface of the preheated water turbine flow passage component again, meanwhile, adopting an activate combustion-high velocity air fuel spray gun to spray a wear-resistant coating material onto the surface of the preheated water turbine flow passage component, and thus forming a wear-resistant coating. The spraying method has the characteristics that the technology is simple, the prepared wear-resistant coating has high bonding strength, and the coating surface does not need to be polished.
Description
technical field [0001] The invention relates to the technical field of anti-corrosion coatings for water turbine flow parts, in particular to a spraying method of the anti-corrosion coating for water turbine flow parts. Background technique [0002] The flow-passing parts of the turbines in hydropower stations, such as guide vanes, top covers, bottom rings, paddles, runners, etc., are usually two-phase flow structures because the conveyed medium usually includes solid particles such as sediment in addition to liquid media. Surfaces are often subject to damage such as corrosion, cavitation, wear, and erosion. Especially when the content of solid particles in the water flow is high and the hardness is high, the damage to the flow-passing parts will be more serious, which will cause system safety failures and increase repair and maintenance costs. [0003] At present, there are usually the following methods for preparing anti-abrasion coatings for water turbines: traditional t...
Claims
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IPC IPC(8): C23C4/12C23C4/06C23C4/129
Inventor 李太江李巍李勇
Owner XIAN THERMAL POWER RES INST CO LTD