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Bonding and high-temperature reliability of NiFeMo alloy/n-type PbTe joints for thermoelectric module applications

Xia, Haiyang and Drymiotis, Fivos and Chen, Cheng-Lung and Wu, Aiping and Chen, Yang-Yuan and Snyder, G. Jeffrey (2015) Bonding and high-temperature reliability of NiFeMo alloy/n-type PbTe joints for thermoelectric module applications. Journal of Materials Science, 50 (7). pp. 2700-2708. ISSN 0022-2461.

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PbTe is an extremely important thermoelectric (TE) material, due to its high TE conversion efficiency. Consequently, our effort focuses on developing PbTe-based TE modules, which requires developing novel approaches for bonding metallic contacts to PbTe. In this study, Fe, Mo, and NiFeMo alloy foils were directly bonded to n-type PbTe using a rapid hot press at 600, 700, or 800 °C under a pressure of 40 MPa and for various holding times. We find that in the case of Fe and Mo, it is difficult to form a metallurgically bonded high strength joint with PbTe. However, we find that NiFeMo alloy does effectively bond to PbTe at 700 °C, but not at 600 °C. Significant liquid Pb, which might be due to the reaction of PbTe with Ni, is found that penetrates along the NiFeMo grain boundaries near NiFeMo/PbTe joints during bonding at 700 °C where the extent of liquid Pb penetration can be controlled with the time of bonding. Furthermore, the Seebeck coefficient of bulk PbTe with NiFeMo contacts is similar to that without NiFeMo contacts. Finally, the accelerated thermal aging of NiFeMo/PbTe elements at 600 °C for 240 h shows that the failure mechanism of NiFeMo/PbTe joints under operating conditions is the continued formation and penetration of eutectic liquid NiFeMo–PbTe and liquid Pb along the NiFeMo grain boundaries.

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Snyder, G. Jeffrey0000-0003-1414-8682
Additional Information:© 2015 Springer Science+Business Media New York. Received: 21 August 2014. Accepted: 3 January 2015. Published online: 24 January 2015. Haiyang Xia thanks for the support of Tsinghua Visiting Doctoral Students Foundation and the Opening Project of State Key Laboratory of Advanced Brazing Filler Metals & Technology (Zhengzhou Research Institute of Mechanical Engineering). This work was supported under the DOW bridge program at Caltech.
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Zhengzhou Research Institute of Mechanical EngineeringUNSPECIFIED
Caltech DOW Bridge ProgramUNSPECIFIED
Record Number:CaltechAUTHORS:20150203-102819422
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Official Citation:Xia, H., Drymiotis, F., Chen, CL. et al. J Mater Sci (2015) 50: 2700. doi:10.1007/s10853-015-8820-8
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54322
Deposited By: Ruth Sustaita
Deposited On:03 Feb 2015 20:45
Last Modified:14 Jun 2017 22:20

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