Manufacturing of Tubular Dead‐End Membranes by Continuous Thermoplastic Extrusion

Abstract

Dense and gastight dead-end tubular Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-d (BSCF) membranes were fabricated by thermoplastic extrusion. Optimal feedstocks for the extrusion of dead-end tubular structures were obtained for a feedstock consisting of 89.83 wt% BSCF powder, 5.63 wt% ethylene vinyl acetate (EVA), 3.56 wt% paraffin wax (PW), and 0.98 wt% stearic acid (SA). Thermogravimetric analysis (TGA) was used to determine the thermal characteristics of the feedstock and to characterize the amount of binder removed during the wicking step. Straight and round dead-end tubular membranes with wall thickness of 0.5 mm could be achieved after sintering. The gastightness test showed that the membranes were leak-tight up to a pressure of 35 bar.

A review on dual-phase oxygen transport membranes: from fundamentals to commercial deployment

“…The term debinding refers to the removal of the binder(s) and the other organic additives (dispersant[s] and plasticiser[s]) from the green tapes. Several methods such as solvent debinding [349][350][351] or catalytic debinding 350 can be used. Nevertheless, thermal decomposition (thermal debinding) is by far the most used method for debinding.…”