Metallization and Diffusion Bonding of CoSb3 -Based Thermoelectric Materials

Materials
Hangbin FengJicai Feng

Abstract

CoSb3-based skutterudite alloy is one of the most promising thermoelectric materials in the middle temperature range (room temperature-550 °C). However, the realization of an appropriate metallization layer directly on the sintered skutterudite pellet is indispensable for the real thermoelectric generation application. Here, we report an approach to prepare the metallization layer and the subsequent diffusion bonding method for the high-performance multi-filled n-type skutterudite alloys. Using the electroplating followed by low-temperature annealing approaches, we successfully fabricated a Co-Mo metallization layer on the surface of the skutterudite alloy. The coefficient of thermal expansion of the electroplated layer was optimized by changing its chemical composition, which can be controlled by the electroplating temperature, current and the concentration of the Mo ions in the solution. We then joined the metallized skutterudite leg to the Cu-Mo electrode using a diffusion bonding method performed at 600 °C and 1 MPa for 10 min. The Co-Mo/skutterudite interfaces exhibit extremely low specific contact resistivity of 1.41 μΩ cm2. The metallization layer inhibited the elemental inter-diffusion to less than 11 µm after annealing...Continue Reading

References

Jan 26, 2008·Nature Materials·G Jeffrey Snyder, Eric S Toberer
Mar 28, 2013·Physical Chemistry Chemical Physics : PCCP·Shien-Ping FengGang Chen
May 17, 2014·Physical Chemistry Chemical Physics : PCCP·James R SalvadorAndrew A Wereszczak

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Citations

Dec 18, 2020·Materials·Yuanhao QinFuhua Yang

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