Laser additive manufacturing of powdered bismuth telluride

Haidong Zhang, Dean Hobbis, George S. Nolas, Saniya Leblanc

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Traditional manufacturing methods restrict the expansion of thermoelectric technology. Here, we demonstrate a new manufacturing approach for thermoelectric materials. Selective laser melting, an additive manufacturing technique, is performed on loose thermoelectric powders for the first time. Layer-by-layer construction is realized with bismuth telluride, Bi2Te3, and an 88% relative density was achieved. Scanning electron microscopy results suggest good fusion between each layer although multiple pores exist within the melted region. X-ray diffraction results confirm that the Bi2Te3 crystal structure is preserved after laser melting. Temperature-dependent absolute Seebeck coefficient, electrical conductivity, specific heat, thermal diffusivity, thermal conductivity, and dimensionless thermoelectric figure of merit ZT are characterized up to 500 °C, and the bulk thermoelectric material produced by this technique has comparable thermoelectric and electrical properties to those fabricated from traditional methods. The method shown here may be applicable to other thermoelectric materials and offers a novel manufacturing approach for thermoelectric devices.

Original languageEnglish
Pages (from-to)4031-4039
Number of pages9
JournalJournal of Materials Research
Volume33
Issue number23
DOIs
StatePublished - Dec 14 2018

Keywords

  • laser
  • powder processing
  • thermoelectric

Fingerprint

Dive into the research topics of 'Laser additive manufacturing of powdered bismuth telluride'. Together they form a unique fingerprint.

Cite this