Fabrication and characterization of YSZ/Ni-YSZ bi-layered composites using thermoplastic coextrusion

Jong Jae Sun, Won Young Choi, Hyoun Ee Kim, Young Hag Koh

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The thermoplastic coextrusion process was used to fabricate YSZ/Ni-YSZ bi-layered composites. In this method, an initial feedrod was prepared by assembling YSZ and NiO-YSZ thermoplastic compounds to produce a monolithic body with a cross-section of 24 mm × 24 mm and then coextruded through various orifices having dimensions of 24 × 2, 1 and 0.6 mm at 120 °C. This simple process produced thin plates with a remarkable reduction in thickness, while preserving the YSZ:NiO-YSZ thickness ratio of 1:39. After binder removal, the samples were co-fired at 1350 °C for 3 h in air, followed by reduction at temperatures ranging from 700 to 900 °C for 5 h in an Ar-5% H2 atmosphere. Using this method, it was possible to fabricate a YSZ/Ni-YSZ bi-layered composite without any noticeable defects, in which a 11-μm thick dense YSZ layer was coated onto a 400-μm thick Ni-YSZ cermet. Furthermore, the fabricated samples showed reasonable electrical conductivities, thus rendering them suitable for use as the basic components of planar solid oxide fuel cells (SOFCs).

Original languageEnglish
Pages (from-to)288-292
Number of pages5
JournalMaterials Chemistry and Physics
Volume104
Issue number2-3
DOIs
Publication statusPublished - 2007 Aug 15
Externally publishedYes

Keywords

  • Fuel Cells
  • Ni-YSZ cermet
  • Thermoplastic coextrusion
  • YSZ electrolyte

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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