Powder extrusion moulding of 430L stainless steel thin tubes for porous metal supported SOFCs

• Published in: Powder metallurgy Vol. 54; no. 2; pp. 103 - 107
• Main Authors: Sotomayor, M E, Levenfeld, B, Várez, A
• Format: Journal Article
• Language: English
• Published: London, England Taylor & Francis 01.04.2011; SAGE Publications; Maney
• Subjects: 430L stainless steel; Applied sciences; Exact sciences and technology; Extrusion; Extrusion molding; Ferritic stainless steels; Metal supported SOFC; Metals. Metallurgy; Molding (process); Moulding; Porous metals; Powder extrusion moulding; Powder metallurgy. Composite materials; Production techniques; Stainless steels; Technology; Tubes; Wall thickness; Metal supported SOFC; 430L stainless steel; Powder extrusion moulding; Tube; Stainless steel; Forming; Spinning; Powder metallurgy; Porous metal
• ISSN: 0032-5899; 1743-2901
• DOI: 10.1179/003258909X12502679013693

Thin and thick walled tubes made of 430L stainless steel for porous metal supported solid oxide fuel cells (SOFCs) were prepared by powder extrusion moulding (PEM). A gas atomised metal powder and a binder composed by 50 vol.-% high density polyethylene and 50 vol.-% paraffin wax were chosen. The most suitable powder loading for feedstock (68 vol.-%) was determined by means of torque experiments and rheological measurements. Mixing temperature was selected taking into account the results from differential scanning calorimetry. The extrusion of tubes was carried out in a single screw extruder and two kinds of tubes with two different wall thicknesses were obtained. In order to investigate the homogeneity of feedstock, microstructure of green tubes was evaluated by SEM. Thermal debinding was performed on the basis of thermogravimetric analysis results. After sintering, tubes with good dimensional stability and without defects were obtained. Different wall thicknesses extruded were 150 and 500 μm.