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| Abstract No.: |
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Scheduled at:
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Thursday, June 08, 2017, Hall 12 4:20 PM
Aviation & Power Generation Industry IV
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| Title: |
Heat treatment of the thermally sprayed coating system NiCrSi-NiCoCrAlY-Al for repair brazing high pressure turbine blades
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| Authors: |
Martin Nicolaus* / Leibniz University Hannover, Germany
Kai Möhwald/ Leibniz University of Hannover, Inst. of materials science, Germany
Maier Hans Jürgen/ Leibniz University of Hannover, Inst. of materials science, Germany
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| Abstract: |
Depending on the size and type defects of nickel-based alloy turbine blades two procedures are used mainly: cladding and high temperature brazing. The focus of this work is the repair brazing of turbine blades, which is applied to regenerate micro cracks and surface defects. In this contribution a two stage hybrid repair brazing process is presented which allows reducing the current process chain for repair brazing turbine blades. In the first stage of this process the filler-metal (NiCrSi) then the hot gas corrosion protective coating (NiCoCrAlY) and finally the aluminium are applied in this order by means of atmospheric plasma spraying. In the second stage of this hybrid technology the applied coating system undergoes a heat treatment in which brazing and aluminizing is combined. The temperature-time regime has an influence on the microstructure of the coating which is investigated in this work.
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