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Journal of Materials Engineering and Performance

, Volume 28, Issue 4, pp 1909–1913 | Cite as

The Effect of Brazing on Microstructure of Honeycomb Liner Material Hastelloy X

  • Sonun Ulan kyzyEmail author
  • Rainer Völkl
  • Oliver Munz
  • Tim Fischer
  • Uwe Glatzel
Article
  • 143 Downloads

Abstract

Labyrinth seals with abradable metallic honeycomb structures are common in gas turbines to ensure a tight sealing between rotor and stator. These seals have a big impact on the turbine efficiency. The honeycombs made from nickel-based superalloys are brazed onto backing segments in order to form liners. In this work, the microstructure of Hastelloy X honeycombs after brazing with a nickel-chromium-silicon braze filler alloy is investigated. It was found that the braze filler can wet the honeycomb foils over their entire height up to the contact surface with the rotor. After solidification, the braze filler alloy forms γ and silicides (NiSi and Niy(Mo, Cr)xSi). The intermetallic silicides give high hardness to the honeycomb liners. Between the braze filler alloy and the honeycomb foils, interdiffusion zones are observed. For the rub-in behavior of the honeycomb liners, not only the foil material but also the comportment of the composite made up of the foil material, the braze filler material and the interdiffusion zones has to be considered.

Keywords

brazing BNi-5 Hastelloy X honeycomb liner rub-in superalloy turbine 

Notes

Acknowledgments

The Deutsche Forschungsgemeinschaft (DFG) financially supported the research, and it is a part of the research Project GL181/40-1.

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Sonun Ulan kyzy
    • 1
    Email author
  • Rainer Völkl
    • 1
  • Oliver Munz
    • 2
  • Tim Fischer
    • 3
  • Uwe Glatzel
    • 1
  1. 1.Metals and AlloysUniversity BayreuthBayreuthGermany
  2. 2.Institute of Thermal TurbomachineryKarlsruhe Institute of TechnologyKarlsruheGermany
  3. 3.Institute of Materials Science and Mechanics of MaterialsTechnical University of MunichMunichGermany

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