Fabrication of large-scale p-type 75%Sb2Te3-25%Bi2Te3 thermoelectric m…
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논문명 | Fabrication of large-scale p-type 75%Sb2Te3-25%Bi2Te3 thermoelectric materials by gas atomization and hot isostatic pressing |
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저자 | Sang Min Yoon, Babu Madavalia, Chul-Hee Lee, Olu Emmanuel Femi, Jong-Hyeon Lee, Sung Ho Song, Soon-Jik Hong |
저널명 | Materials Research Bulletin |
게재년월 | 2020/5/12 |
Vol. pp |
For economic viability of thermoelectric modules, issues of scalability and sturdiness to drive down production
and manufacturing cost must be adequately addressed. In this study, we report a large-scale production of 3 Kg/
batch of 75%Sb2Te3-25%Bi2Te3 powder by gas atomization. The as-produced large-scale atomized powder was
subsequently sintered by hot isostatic pressing (HIP) at two different temperatures. The microstructure of the
HIPed fracture surface reveals a transgranular mode of fracture in the basal plane of the grains perpendicular to
the contact surface. The texture analysis showed that grains were randomly distributed and indicating no preferred alignment in any direction. The sample HIPed at 450 °C shows the highest electrical conductivity of 1350
Ω−1 cm−1 at room temperature due to their high carrier mobility. The highest ZT of 1.15 at 375 K was observed
for the sample HIPed at 450 °C owing to their high electrical conductivity, and reasonable low thermal conductivity.