Preparation of Ceramic Composite Pipes Through Paste Extrusion

摘要

An experimental investigation was carried out in order to prepare ceramic composite pipes used for tubular solid oxide fuel cells by using a multi-billet extrusion technique. Particular emphasis was given to the forming possibility and extrusion behavior of a two-layer pipe consisting of NiO-YSZ(PSZ) (anode) and YSZ (electrolyte). It is shown that the extrusion pressure and binder content required decrease with increasing the fraction of nickel oxide in the anode layers. The porosity in the anode layers depends on the binder content in pastes. It is feasible to prepare anode/electrolyte composite pipes by means of co-extrusion of different pastes.Furthermore, it is possible to obtain sound sintered pipes even under pressureless sintering conditions.