Improvement of thermoelectric power of n-type earth-abundant iron rich alloy by microstructure engineering

Jun Wang, Yan Li, Xinba Yaer, Aodun Qiqige, Chao Fang, Lei Miao, Chengyan Liu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Due to the exhaustion of rare metal resources and the hazard of toxic material to the environment, development of cost-effective, nontoxic, and earth-abundant thermoelectric materials has become more urgent. This study introduces a nontoxic, earth abundant n-type iron-based cost-effective Fe-2.3C-Si-5Mn-7V-8Cr thermoelectric material that is prepared by a simple melting method. Significant increase in both electrical conductivity and Seebeck coefficient are achieved by several heat treatment processes to optimize the distribution and grain size of VC, Cr23-xFexC6 typed chromium carbide as well as base matrix. As a result, the power factor of the sample that is normalized at 1150 °C is about 0.75 mWm-1K -2 in maximum value, which is 2.6 times larger than that (0.29 mWm-1K-2) of as-cast sample. The highest ZT value of the sample that is normalized at 1150 °C is 0.028 at 868 K, which is 4.3 times larger than that of as-cast sample (0.0065 at 964 K) in present study, indicating that a proper heat treatment process would remarkably enhance ZT value. This research provides extremely valuable data for the future researches on thermoelectric alloys.

Original languageEnglish
Pages (from-to)7-12
Number of pages6
JournalJournal of Alloys and Compounds
Volume665
DOIs
Publication statusPublished - 2016 Apr 25
Externally publishedYes

Keywords

  • Chromium carbide
  • Iron rich alloy
  • Microstructure
  • Thermoelectric power
  • Vanadium carbide

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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