Journal
JOURNAL OF MATERIALS RESEARCH
Volume 33, Issue 23, Pages 4031-4039Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2018.390
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Funding
- Oak Ridge National Laboratory Manufacturing Demonstration Facility RAMP-UP [4000145175]
- Virginia Center for Innovative Technology (CRCF Award) [MF16-020-En]
- GWU University Facilitating Fund
- National Science Foundation [DMR-1748188]
- II-VI Foundation Block-Gift Program
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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 degrees 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.
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