Fabrication of multilayer-type Mn-Si thermoelectric device

T. Kajitani, T. Ueno, Y. Miyazaki, K. Hayashi, T. Fujiwara, R. Ihara, T. Nakamura, M. Takakura

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

This research aims to develop a direct-contact manganese silicon p/n multilayer-type thermoelectric power generation block. p-type MnSi 1.74 and n-type Mn0.7Fe0.3Si1.68 ball-milled powders with diameter of about 10 μm or less were mixed with polyvinyl butyl alcohol diluted with methylbenzene at pigment volume concentration of approximately 70%. The doctor-blade method produced 45-μm-thick p- and n-type pigment plates. The insulator, i.e., powdered glass, was mixed with cellulose to form insulator slurry. Lamination of manganese silicide pigment layers and screen-printed insulator layers was carried out to fabricate multilayer direct-contact thermoelectric devices. Hot pressing and spark plasma sintering were carried out at 450°C and 900°C, respectively. Four to 30 thermoelectric (TE) p/n pairs were fabricated in a 10 mm × 10 mm × 10 mm sintered TE block. The maximum output was 11.7 mW/cm2 at a temperature difference between 20°C and 700°C, which was about 1/85 of the ideal power generation estimated from the thermoelectric data of the bulk MnSi1.74 and Mn0.7Fe 0.3Si1.68 materials. A power generation test using an engine test bench was also carried out.

Original languageEnglish
Pages (from-to)1993-1999
Number of pages7
JournalJournal of Electronic Materials
Volume43
Issue number6
DOIs
Publication statusPublished - 2014 Jun
Externally publishedYes

Keywords

  • SPS
  • Seebeck coefficient
  • Thermoelectric device
  • sintering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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