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

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...

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Bibliographic Details
Published in:Journal of materials research 2014-08, Vol.29 (16), p.1771-1780
Main Authors: Börner, Floriana-Dana, Schreier, Max, Feng, Bing, Lippmann, Wolfgang, Martin, Hans-Peter, Michaelis, Alexander, Hurtado, Antonio
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Bars
Biomaterials
Bond strength
Boron
Brazing
Ceramics
Chemical bonds
Conductivity
Efficiency
Electric currents
Energy
Furnace brazing
Graphite
Heat conductivity
Hot pressing
Inorganic Chemistry
Joining
Lasers
Materials Engineering
Materials research
Materials Science
Metals
Modules
Nanotechnology
Silver
Studies
Temperature
Thermoelectricity
Titanium
Titanium dioxide
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Summary: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.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2014.216