Title of article :
Thermoelectric and mechanical properties of melt spun and spark plasma sintered n-type Yb- and Ba-filled skutterudites
Author/Authors :
Salvador، نويسنده , , James R. and Waldo، نويسنده , , Richard A. and Wong، نويسنده , , Curtis A. and Tessema، نويسنده , , Misle and Brown، نويسنده , , David N. and Miller، نويسنده , , David J. and Wang، نويسنده , , Hsin and Wereszczak، نويسنده , , Andrew A. and Cai، نويسنده , , Wei، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
10
From page :
1087
To page :
1096
Abstract :
Here we present thermoelectric and mechanical properties of n-type filled-skutterudites produced by a combination of melt spinning of pre-melted charges with subsequent consolidation by spark plasma sintering, a process we refer to as MS-SPS. This combination of processing steps leads to phase-pure n-type filled-skutterudites and obviates more energy and time intensive annealing steps. We show that both the thermoelectric properties and the tensile fracture strength compare favorably to materials made by traditional methods. The process is scalable to at least 80 g billets, such that the transport properties measured on test bars harvested from these larger billets compare favorably to those measured on lab-scale billets (5 g total billet mass). ZT values approaching 1.1 at 750 K were observed in materials made by MS-SPS. In addition, the tensile fracture strength of test bars cut from an 80 g billet is ∼128 MPa at room temperature and decreases with increasing temperature. Fractography of the test bars reveals that the majority failed due to surface and edge flaws with few failures due to volume type flaws. This indicates that the powder metallurgical methods employed to produce these samples is mature.
Keywords :
Elastic modulus , Thermoelectrics , skutterudites , melt spinning
Journal title :
MATERIALS SCIENCE & ENGINEERING: B
Serial Year :
2013
Journal title :
MATERIALS SCIENCE & ENGINEERING: B
Record number :
2150897
Link To Document :
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