Novel water erosion resistant composite coating structure

Abstract

The invention discloses a novel water erosion resistant composite coating structure. The novel water erosion resistant composite coating structure comprises a transition layer (3) disposed on a substrate (4) and a plurality of composite coating layers, wherein the composite coating layers are disposed on the transition layer (3) by physical vapor deposition. Each of the composite coating layers includes a metal Me soft layer (2) and a metal nitride MeN hard layer (1), wherein the metal Me soft layer (2) and the metal nitride MeN hard layer (1) are disposed in sequence from inside to outside. According to the novel water erosion resistant composite coating structure, due to the fact that a single-layer TiN and ZrN film layer has multiple inherent defects in the anti-erosion performance, thesingle-layer TiN and ZrN film layer is used as a ceramic hard film, the internal stress is generally larger in the preparation process, thicker deposition is difficult to achieve directly, and the single-layer TiN and ZrN film layer is arranged at the edge of a workpiece, so that the film layer is prone to cracking and falling off at a later time. When the thickness of the film layer is thinner,and the protection requirements of relevant components are difficult to meet by the anti-erosion performance of the film layer, so that a more effective measure is to adopt multilayer structure film layers in order to meet the engineering application requirements.

Description

technical field [0001] The invention belongs to the technical field of industrial equipment, and in particular relates to a novel anti-corrosion composite coating structure applied to slow down the water erosion rate of steam turbine blades. Background technique [0002] At the beginning of the 21st century, ultra-supercritical power generation technology was identified as a strategic key technology in my country's clean coal technology field. After more than ten years of public relations research and development and application, my country's ultra-supercritical power generation technology has quickly reached the world's advanced level. At present, supercritical, ultra-supercritical thermal power steam turbines and million-level nuclear power steam turbines are still the main generating units in my country. In the context of the rapid development of the global economy and the increasing demand for electric energy, steam turbines, as the main power generation of power plants,...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the water erosion problem, a complete and mature material water erosion model and theory have not been formed so far, and the water erosion of the last stage blade is still one of the most important problems affecting the thermal economy, safety and reliability of large-scale unit operation.

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