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Application of powder injection moulding and extrusion process to manufacturing of Ni-YSZ anodes

Matula G., Jardiel T., Levenfeld B., Várez A.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 36, nr 1

87-94

Purpose: Investigation of the Ni-YSZ cermets for anode supported solid oxide fuel cells (SOFC) prepared by extrusion or powder injection moulding process, sintered and reduced of NiO-YSZ. Design/methodology/approach: Density examination, shrinkage examination, transverse rupture strength tests, microstructure examination. Findings: Results of the rheological and torque investigations have essential importance for further search of the optimum feedstock to injection moulding machines and extruders making forming possible of shapes for fuel cells anodes, which require in addition debinding of the binder, sintering, and reduction. Practical implications: The proposed technological solutions for fabricating anodes as tubes or flat shapes will make connecting the cells into packets possible which will allow increasing the cell power. Originality/value: The presented investigation results confirm purposefulness of employing injection moulding or extrusion for fabrication of fuel cells anodes. These two methods are used for manufacturing elements of devices in a mass scale. Significant interest in fuel cells and rapid development of their production which should take place in the close future may be the reason for searching the inexpensive technological solutions in the manufacturing process of the cells.

Microstructure, mechanical and electrical properties of Ni-YSZ anode supported solid oxide fuel cells

Matula G., Jardiel T., Jimenez R., Várez A.

Archives of Materials Science and Engineering

2008

Vol. 32, nr 1

21-24

Purpose: Investigation of the Ni-YSZ cermets for anode supported solid oxide fuel cells (SOFC) prepared by uniaxial pressure, sintered and reduced pellets of NiO-YSZ. Design/methodology/approach: Density examination, shrinkage examination, transverse rupture strength tests, microstructure examination. Findings: Basing on the investigations of the anode Ni-YSZ type fabricated with powder metallurgy it was found of that density of sintered samples depends on NiO portion, temperature of sintering and reducing. Increase of sintering temperature causes increase of density. Moreover increase of NiO portion and reducing temperature causes decrease of density and linear contraction of anode. Practical implications: The Ni-YSZ cermets fabricated using of powder metallurgy are characterized by very good properties and can be used as SOFC anode. Powder metallurgy gives the possibility to manufacturing cermet used as an anode for SOFC on the basis of Ni-YSZ. Originality/value: Investigations of compacted, sintered and reduced samples with different amount of NiO gives information about optimal manufacturing conditions and volume fraction of NiO/YSZ components. This information is especially important at production process of extruded tubes.