Abstract
Mechanical alloying was carried out to produce CrSi2 thermoelectric compound using a mixture of elemental Cr33Si67 powders. An optimal milling and heat treatment conditions to obtain the single phase of CrSi2 compound with fine microstructure were investigated by X-ray diffraction and differential scanning calorimetry measurement. CrSi2 intermetallic compound with a grain size of 70 nm could be obtained by MA of Cr33Si67 powders for 70 hours and subsequently annealed at 650 o C. Consolidation of the MA powders was performed in a spark plasma sintering (SPS) machine using graphite dies at 600~1000 o C under 60 MPa. The shrinkage of MA samples during SPS consolidation process increased gradually with increasing temperature up to 1000 o C and relatively significant at about 600 o C. We tend to believe that these behaviors are deeply related to form a CrSi2 compound during heating process, as can be realized from the DSC measurement. Electrical conductivity and Seebeck coefficient of sintered bodies were measured up to 900 o C. Seebeck coefficient and power factor of Cr33Si67 compact prepared by MA and SPS at 1000 o C showed the maximum value of 125 µV/K at 400 o C and 4.3 × 10 −4 W/mK 2 at 350 o C, respectively.
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