Fabrication of 8-YSZ thin-wall tubes by powder extrusion moulding for SOFC electrolytes Articles uri icon

publication date

  • August 2009

start page

  • 2329

end page

  • 2335

issue

  • 6

volume

  • 35

International Standard Serial Number (ISSN)

  • 0272-8842

Electronic International Standard Serial Number (EISSN)

  • 1873-3956

abstract

  • In this work the processing steps for producing YSZ thin tubes by means of powder extrusion moulding (PEM) technique are investigated. Different feedstocks were prepared from a commercial YSZ powder and a multicomponent thermoplastic binder system based in polypropylene and paraffin wax. The surface coating of YSZ powder with stearic acid in a high-performance dispersing instrument reduces the viscosity of the feedstock one order of magnitude respect to a feedstock with a same composition and un-coated powder. This fact allows increasing the solid loading up to 58 vol.% to obtain sintering tubes with densities higher than 97% and with wall thickness lower than 200 mum.

keywords

  • extrusion; electrical conductivity; zro2; fuel cells; tubular electrolyte