No abstract

In recent years, ICE (Internal Combustion Engine)-Independent generators, so-called APUs (Auxiliary Power Units) based on SOFC-stack technologies, have attained high interest for the electrical power supply in heavy duty vehicles. Because of its specific advantages, the metalsupported fuel cell (MSC) type is one of the most focused cell technologies world-wide which are developed for such an application.Owing to its cooperation with the Forschungszentrum Jülich (FZJ) and their advanced expertise in sinter and thin-film technologies for planar anode-supported cells (ASC) Plansee pursues to develop and establish its own industrial pilot fabrication to offer customers high-performance MSCs and "ready to stack"-components.In the scope of the present work MSC cells were developed on the basis of a porous support made from a ferritic oxide dispersion strengthened Fe-Cr alloy (ITM). A sintered anode of nickel and 8 mol% yttria stabilized zirconia (8YSZ) and an adaptation layer (8YSZ) were applied to provide a smooth surface with a small pore size of approx. 100 nm which allowed the deposition a very thin gas-tight electrolyte layer. Very thin electrolytes of gadolinium doped ceria (GDC) were sputtered yielding a thickness of approx. 1.5 µm to form gas-tight half-cell. First cell and stack-tests with a lanthanum strontium cobalt ferrite (LSCF) cathode are presented. In the stack a current density of 1.2 A/cm² was reached at 800 °C and 0.7 V. This was the same power output as conventional anode supported cells under the same testing conditions. Therefore, it is shown that metal supported cells can deliver the same electrochemical performance as anode supported cells in a stack. Abstract #732, 219th ECS Meeting, © 2011 The Electrochemical Society ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.64.-35.42 Downloaded on 2014-12-02 to IP

A novel generation of a thin-film, metal supported solid oxide fuel cell (MSC) has been developed and demonstrated in the scope of the NextGen MSC project (funded by the German Federal Ministry of Economics and Technology) by Plansee, Forschungszentrum Jülich (FZ-J), and the Karlsruhe Institute of Technology (KIT), respectively. In the scope of this work, due to consequent electrolyte and electrode development, a novel cell configuration, based on Plansee's well-known porous FeCr alloy as mechanical cell support, could be established. Thus, first cell measurements at KIT indicate the feasibility and the reliability of the established cell manufacturing process. The tested cell has shown a current density of 1.52 A/cm² at 0.7 V and 820°C. This corresponds with an area specific cell performance of 1,064 mW/cm 2 . Furthermore, during a cell operation time of approx. 300 h, the cell degradation was relatively low.

The metal supported solid oxide fuel cell (MSC) technology has attained high interest for the electrical power supply of vehicles by auxiliary power units (APUs) which operate independently from the main engine. Its main advantages compared to other SOFC technologies are higher mechanical stability and better thermal and redox behaviour, which are indispensible for mobile applications. For many years, Plansee has developed and fabricated porous metallic substrates, interconnector plates and protective coatings for various types of SOFCs which are used in mobile as well as in stationary applications. Plansee has recently developed technologies for the production of MSCs in close cooperation with various partners from science and industry. This paper presents results of this development.

In the scope of this work, 2 mm thick TZM sheet metal is butt welded by electron beam welding (EBW) without filler material and a systematic investigation of the most relevant welding parameters to improve the weld quality is conducted. With the aid of design of experiment (DoE), it is shown that with careful selection of the welding parameters it is possible to considerably reduce the size of the fusion zone and the heat affected zone and the grain size of both. Furthermore, the influence of the parameters on the quality of the weld and the characterizing values ultimate tensile strength and hardness of fusion zone is presented. It is concluded, which parameters influence the quality of the weld and suppress pores and cracks.