Surface wear-resisting layer of gas turbine compressor blade and blade root and manufacturing method thereof

Abstract

The invention provides a surface wear-resisting layer of gas turbine compressor blade and blade root and a manufacturing method thereof. The surface wear-resisting layer is positioned on the contact surface of blade bottom and an impeller, and is a coating which is made of copper-nickel indium alloy powder; the copper-nickel indium alloy powder comprises the following components: 50-60 wt% of copper powder, 30-40 wt% of nickel powder, 3-10 wt% of indium powder; and a supersonic speed flame spraying method is used to spray the copper-nickel indium alloy powder on the surface of the blade root. The thickness of the coating is 0.07-0.09 mm. The surface wear-resisting layer of the invention is a fretting wear-resisting layer, which enhances blade fretting fatigue resistance, and prolongs the service life of products. the supersonic speed flame spraying (AC-HVAF) process method is adopted to prepare the copper-nickel-indium coating with lower porosity and high bonding strength; the method simplifies process flow, reduces production cost, plays a positive social benefit for the improvement of gas turbine product quality and the popularization of new technology and new process of the products, and greatly facilitates localization progress of heavy gas turbine products in China.

Description

technical field [0001] The invention relates to the processing field of steam turbines, in particular to a surface wear-resistant layer of a gas turbine compressor motor blade root and a preparation method thereof. Background technique [0002] During the use of the gas turbine, due to the inevitable gap between the blade root and the impeller mating surface, when the rotor rotates at high speed, the blade root and the impeller will produce fretting wear, resulting in damage to the blade, especially the moving blade of the heavy-duty gas turbine compressor. The blade root is extremely prone to fretting wear during actual work. Therefore, the mating surface between the blade root and the impeller needs to be hardened to improve its anti-fretting fatigue performance. The traditional method is carburizing and nitriding on the surface, or spraying and welding the wear-resistant layer with wear-resistant materials. In modern times, foreign countries also spray coatings on the su...

AI Technical Summary

Problems solved by technology

At present, many large foreign companies use the atmospheric plasma spraying process (APS) to prepare the coating. The blade root surface coating prepared by the atmospheric plasma spraying process (APS) is poorly bonded to the substrate, and it is easy to cause coating during the long-term operation of the blade. Layer peeling; coating porosity is high, coating oxidation is serious

Moreover, the coating is prepared by the atmospheric plasma spraying process (APS), the process flow is complex, the requirements for the working environment and production equipment are very strict, the production cost is high, and it is not suitable for large-scale promotion.

Images