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1 results

  • Development of laser-based joining technology for the fabrication of ceramic thermoelectric modules

  • Floriana-Dana Börner, Max Schreier, Bing Feng, Wolfgang Lippmann, Hans-Peter Martin, Alexander Michaelis, Antonio Hurtado
  • Journal:
    Journal of Materials Research / Volume 29 / Issue 16 / 28 August 2014
    Published online by Cambridge University Press:
    12 September 2014, pp. 1771-1780
    Print publication:
    28 August 2014

  • The process of laser-induced brazing constitutes a potential option for connecting several ceramic components (n- and p-type ceramic bars and ceramic substrate) of a thermoelectric generator (TEG) unit. For the construction of the TEGs, TiOx and BxC were used as thermoelectric bars and AlN was used as substrate material. The required process time for joining is well below that of conventional furnace brazing processes and, furthermore, establishes the possibility of using a uniform filler system for all contacting points within the thermoelectric unit. In the work reported here, the application-specific optimization of the laser-joining process is presented as well as the adapted design of the thermoelectric modules. The properties of the produced bonding were characterized by using fatigue strength and microstructural investigations. Furthermore, the operational reliability of the modules was verified.