Compatibility between co-metallized PbTe thermoelectric legs and an Ag-Cu-In brazing alloy

Dana Ben-Ayoun, Yatir Sadia, Yaniv Gelbstein

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

In thermoelectric (TE) generators, maximizing the efficiency of conversion of direct heat to electricity requires the reduction of any thermal and electrical contact resistances between the TE legs and the metallic contacts. This requirement is especially challenging in the development of intermediate to high-temperature TE generators. PbTe-based TE materials are known to be highly efficient up to temperatures of around 500°C; however, only a few practical TE generators based on these materials are currently commercially available. One reason for that is the insufficient bonding techniques between the TE legs and the hot-side metallic contacts. The current research is focused on the interaction between cobalt-metallized n-type 9.104 × 10-3 mol % PbI2-doped PbTe TE legs and the Ag0.32Cu0.43In0.25 brazing alloy, which is free of volatile species. Clear and fine interfaces without any noticeable formation of adverse brittle intermetallic compounds were observed following prolonged thermal treatment testing. Moreover, a reasonable electrical contact resistance of ~2.25 mΩmm2 was observed upon brazing at 600°C, highlighting the potential of such contacts while developing practical PbTe-based TE generators.

Original languageEnglish
Article number99
JournalMaterials
Volume11
Issue number1
DOIs
StatePublished - 10 Jan 2018

Keywords

  • Bonding
  • Brazing
  • Metallic contacts
  • PbTe
  • Thermoelectrics

ASJC Scopus subject areas

  • General Materials Science

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