Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Influence of milling atmosphere on thermoelectric properties of p-type Bi-Sb-Te based alloys by mechanical alloying

  • Yoon, Suk-min (Division of Advanced Materials Engineering, Kongju National University) ;
  • Nagarjuna, Cheenepalli (Division of Advanced Materials Engineering, Kongju National University) ;
  • Shin, Dong-won (Division of Advanced Materials Engineering, Kongju National University) ;
  • Lee, Chul-hee (Division of Advanced Materials Engineering, Kongju National University) ;
  • Madavali, Babu (Division of Advanced Materials Engineering, Kongju National University) ;
  • Hong, Soon-jik (Division of Advanced Materials Engineering, Kongju National University) ;
  • Lee, Kap-ho (Department of Materials Science & Engineering, Chungnam National University)
  • Received : 2017.10.16
  • Accepted : 2017.10.24
  • Published : 2017.10.28
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Abstract

In this study, Bi-Sb-Te thermoelectric materials are produced by mechanical alloying (MA) and spark plasma sintering (SPS). To examine the influence of the milling atmosphere on the microstructure and thermo-electric (TE) properties, a p-type Bi-Sb-Te composite powder is mechanically alloyed in the presence of argon and air atmospheres. The oxygen content increases to 55% when the powder is milled in the air atmosphere, compared with argon. All grains are similar in size and uniformly, distributed in both atmospheric sintered samples. The Seebeck coefficient is higher, while the electrical conductivity is lower in the MA (Air) sample due to a low carrier concentration compared to the MA (Ar) sintered sample. The maximum figure of merit (ZT) is 0.91 and 0.82 at 350 K for the MA (Ar) and MA (Air) sintered samples, respectively. The slight enhancement in the ZT value is due to the decrease in the oxygen content during the MA (Ar) process. Moreover, the combination of mechanical alloying and SPS process shows a higher hardness and density values for the sintered samples.

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