Brazing is an established repair technology for turbine blades (air foils and vanes) in the industry and includes multiple process steps that may also require a high degree of manual work. In this study, the development of a near net shape joining and coating hybrid technology for the repair of turbine blades is presented. With this technology, it is possible to shorten the current state-of-the-art process chain for repairing turbine blades. The worn turbine blade receives a repair coating applied by thermal spraying consisting of a nickel based filler metal, a hot gas corrosion protective layer, a bond coat and finally a thermal barrier coating. Subsequently the coated turbine blade is heat treated and a simultaneous brazing and aluminizing process is carried out. The technology presented here brings about technical and economic advantages and allows to shorten the state-of-the-art process chain for repairing turbine blades.

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Near Net Shape Turbine Blade Repair Using a Joining and Coating Hybrid Process

  • Martin Nicolaus,
  • Kai Möhwald,
  • Hans Jürgen Maier

摘要

Brazing is an established repair technology for turbine blades (air foils and vanes) in the industry and includes multiple process steps that may also require a high degree of manual work. In this study, the development of a near net shape joining and coating hybrid technology for the repair of turbine blades is presented. With this technology, it is possible to shorten the current state-of-the-art process chain for repairing turbine blades. The worn turbine blade receives a repair coating applied by thermal spraying consisting of a nickel based filler metal, a hot gas corrosion protective layer, a bond coat and finally a thermal barrier coating. Subsequently the coated turbine blade is heat treated and a simultaneous brazing and aluminizing process is carried out. The technology presented here brings about technical and economic advantages and allows to shorten the state-of-the-art process chain for repairing turbine blades.