Development of laser-based joining technology for the fabrication of ceramic thermoelectric modules. Issue 16 (28th August 2014)

• Record Type: Journal Article
• Authors: Börner, Floriana-Dana; Schreier, Max; Feng, Bing; Lippmann, Wolfgang; Martin, Hans-Peter; Michaelis, Alexander; Hurtado, Antonio
• Is Part Of: Journal of materials research. Volume 29:Issue 16(2014)
• Page Start: 1771
• Page End: 1780
• Publication Date: 2014-08-28
• Subjects: Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2014.216
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : 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, TiO x and B x C 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.