TiSi-based nano-composite multilayer water-erosion-resistant film of turbine blade and application of TiSi-based nano-composite multilayer water-erosion-resistant film

Abstract

The invention discloses a TiSi-based nano-composite multilayer water-erosion-resistant film of a turbine blade and application of the TiSi-based nano-composite multilayer water-erosion-resistant film. The TiSi-based nano-composite multilayer water-erosion-resistant film comprises a metal Cr bottom layer, a TiSi transition layer, a TiSiN oxidation-resistant transition layer and a TiCrSiCN water-erosion-resistant film layer which are sequentially deposited on the surface of the turbine blade. The TiCrSiCN water-erosion-resistant film layer is of a nano-composite structure of Ti(CN), CrN nanocrystals, Si3N4 and C amorphous phases. The surface of the turbine blade is cleaned, then the turbine blade is placed on a rotating device in a vacuum chamber to rotate, plasma cleaning is conducted, then the metal Cr bottom layer, the TiSi transition layer, the TiSiN oxidation-resistant transition layer and the TiCrSiCN water-erosion-resistant film layer are sequentially deposited on the surface of the turbine blade through a multi-arc ion plating physical vapor deposition method, and thus the TiSi-based nano-composite multilayer water-erosion-resistant film of the turbine blade is prepared. The TiSi-based nano-composite multilayer water-erosion-resistant film is simple to operate, low in cost and environmentally friendly.

Description

technical field [0001] The invention relates to the fields of material surface strengthening, anti-corrosion and anti-wear, in particular to a TiSi-based nanocomposite multi-layer water erosion-resistant film for steam turbine blades and an application thereof. Background technique [0002] As a key component of a steam turbine, blades are subject to severe corrosion and wear under service conditions. The blades are prone to water erosion, erosion wear, and then induce cracks and fatigue damage. The commonly used surface protection (or modification) technologies of steam turbine components mainly include diffusion treatment and surface coating technology. Diffusion treatment is to modify the surface by changing the chemical composition of the component surface, infiltrating or injecting certain elements, and can also add heat treatment at the same time to achieve resistance to water erosion, cavitation, and erosion wear, such as carburizing, nitriding, and nitriding. boron...

AI Technical Summary

Problems solved by technology

The spraying process of arc spraying, supersonic flame spraying and plasma spraying involves many steps and many control links. Especially in the field of anti-corrosion, it is also necessary to spray sealing agent, which significantly increases the amount of construction; especially the equipment for plasma spraying is more expensive and more flexible. Poor, and the cost of high-alloy powder materials is also high, which limits the application of the process

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