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WITHDRAWN - EN10.13.40 : Inorganic Binders for the Fabrication of a BiTe Based Thermopile

5:00 PM–7:00 PM Apr 5, 2018

PCC North, 300 Level, Exhibit Hall C-E

Description
Aaron Melad1 Marcus Glazebrook1 June Stanley1 Chowdary Koripella1

1, Sandia National Labs, Albuquerque, New Mexico, United States

The voltage generated by a thermoelectric device depends on the Seebeck coefficient, temperature gradient and the number of couples. The fabrication of a thermoelectric generator requires joining several thermoelectric elements or couples into a thermopile to generate sufficient voltage. Depending on the aspect ratio of the thermoelectric elements, if the cross-sectional area of the individual elements is considerably small, then a binder is required to provide structural rigidity to hold together all the thermoelectric elements into a thermopile. The binder should have low thermal conductivity to reduce heat losses and it should not react adversely with the thermoelectric elements which would degrade thermoelectric properties and its figure of merit (zT). Depending on the hot end temperature of operation of the thermopile, polymer binders may not be suitable and high temperature inorganic binders are needed. Several ceramic cements and low temperature glasses were evaluated as a possible binder for the fabrication of a BiTe thermopile. A simple P-N thermocouple test device was fabricated with different binders, and the Seebeck coefficient, electrical resistivity and zT were measured. Cross-section examinations were performed to study the material interactions between the thermoelectric elements and the binder. Performance of the BiTe based P-N couple with different binders and the influence of processing conditions on the thermoelectric properties were presented.

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