Forschungszentrum Juelich Gmbh

Vdm Metals International Gmbh

Willem Quadakkers

Heike Hattendorf

Werner Theisen

Leszek Niewolak

Lorenz Singheiser

Tilmann Beck

Thomas Eckardt

Bernd Kuhn

Nilofar Nabiran

An iron-chromium-aluminum alloy with improved heat resistance, low chromium vaporization rate and good processability, comprising (in % by mass), 2.0 to 4.5% Al, 12 to 25% Cr, 1.0 to 4% W, 0.25 to 2.0% Nb, 0.05 to 1.2% Si, 0.001 to 0.70% Mn, 0.001 to 0.030% C, 0.0001 to 0.05% Mg, 0.0001 to 0.03% Ca, 0.001 to 0.030% P, max. 0.03% N, max. 0.01% S, remainder iron and the usual melting-related impurities.

Heat-resistant iron-chromium-aluminum alloy with low chromium vaporization rate and elevated thermal stability

An interconnector is made of ferritic chromium steel, on which a cupriferous layer is disposed. This layer prevents interdiffusion between the chromium steel and additional components with which the interconnector has direct contact. According to the state of the art, such diffusion occurs particularly if these additional components contain nickel. In addition, the interconnector may comprise a chromium-containing oxide layer as a barrier against interdiffusion. For this purpose, the interconnector steel can also be preoxidized before applying the cupriferous layer. The interconnector has a significantly longer service life than interconnectors according to the state of the art, and it has improved electrical conductivity because the electrical contact surface thereof is free of oxides and has high transverse conductivity.

Interconnector for a fuel cell stack and method for production

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EG Wijnandsrade, Netherlands

Willem Quadakkers