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Joining and properties of electrode for CoSb3 thermoelectric materials prepared by a spark plasma sintering method

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2010, 20(1), pp.30~34
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Kyounghun Kim 1,  Park Joo-Soek 1,  안종필 2

1한국세라믹기술원
2요업(세라믹)기술원

Accredited

ABSTRACT

CoSb3-based skutterudite compounds are promising candidates as thermoelectric (TE) materials used in intermediate temperature region. In this study, sintering of CoSb3 powder and joining of CoSb3 to copper-molybdenum electrode have been simultaneously performed by spark plasma sintering technique. The Ti foil was used for preventing the diffusion of copper into CoSb3 and the Cu : Mo = 3 : 7 Vol. ratio composition was selected by the consideration of thermal expansion coefficients. The insertion of Ti interlayer between Cu-Mo and CoSb3 was effective to join CoSb3 to Cu-Mo by forming an intermediate layer of TiSb2 at the Ti-CoSb3 boundary. However, the formation of TiSb and TiCoSb intermediate layers deteriorated the joining properties by the generation of cracks in the interface of intermediate layer/CoSb3 and intermediate/intermediate layers.

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