A kind of fan blade and preparation method thereof

Abstract

The invention discloses a fan blade. The fan blade comprises a blade body. Composite coatings are arranged on a pressure surface and a force suction surface which are located on one side of the air inlet edge of the blade body. The width of the composite coating located on the pressure surface of the blade body is 1 / 5-1 / 3 of the width of pressure surface of the blade body, and the rest parts of pressure surface of the blade body are provided with a WC-10Co-4Cr coating. The width of the composite coating located on the force suction surface of the blade body is 1 / 5-1 / 3 of the width of force suction surface of the blade body, and the rest parts of force suction surface of the blade body are provided with a WC-10Co-4Cr coating. Each composite coating comprises a NiCrMoW coating and a WC-17Ni coating which are arranged from interior to exterior in sequence. The invention further discloses a preparation method of the fan blade. The preparation method comprises the following steps of a, fusion covering, b, sand blasting, c, spraying, and d, coating sealing. According to the blade prepared through the preparation method, the overall deformation of the blade is smaller than 0.5 mm and has good corrosion resistance and erosion-abrasion resistance, so that the service life is greatly prolonged.

Description

technical field [0001] The invention relates to the field of blades, in particular to a fan blade and a preparation method thereof. Background technique [0002] The fan is the main auxiliary machine of the boiler unit. The medium conveyed by the fan is flue gas, and the working temperature is usually in the range of 130-200°C. The harmful gas components in the flue gas mainly include sulfur dioxide, carbon monoxide, hydrocarbons, and nitrogen dioxide; among them, the corrosive medium includes SO2 and trace amounts of SO3 and NOx, and contains high-hardness dust particles such as SiO2, Al2O3, and Fe2O3; traditional The blades are only sprayed with a layer of nickel-based alloy powder near the air intake edge and then sprayed with WC-Ni wear-resistant coating. The coating has poor anti-erosion and corrosion effects. The above-mentioned corrosive medium and high-hardness dust particles will corrode the fan blades. And strong erosion and wear. After the blades are worn, the ef...

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Problems solved by technology

[0003] The purpose of the present invention is to address the above problems, to provide a fan blade and its preparation method, to solve the problem of poor anti-erosion and corrosion effects of the existing fan blades, and to prepare the coated fan blades by manual flame spraying and melting. layer, the heating temperature is high, the surface oxidation is serious, and it is easy to cause serious deformation of the blade

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