Sintering Behavior of Multimodal Ceria Powder Mixtures for Fuel Cell Applications
Sub-micrometer scaled CGO (Ce0,9Gd0,1O1,95) powder is used in order to manufacture Ni/CGO functionally graded green bodies with high green densities. Thereby the near-shape manufacturing of Ni/CGO cermets by gel casting of CGO and Ni powder mixtures and electrophoretic impregnation of sub-micro scaled ceria doped particles into a Ni/CGO mesoporous matrix is described. Solids content of dispersed suspensions is varied as well as the mixing ratio of sub-micro sized and micro sized particles. The influence on green density and sintering behavior is investigated in order to achieve maximum CGO densities in combination with maximum ionic conductivity for potential use in SOFC. Shrinkage rates from sintering experiments with constant rates of heating (CRH) are analyzed to determine most suitable co-sintering conditions of Ni-Ni/CGO composite anode materials.
Omer Van der Biest, Michael Gasik, Jozef Vleugels
G. Falk et al., "Sintering Behavior of Multimodal Ceria Powder Mixtures for Fuel Cell Applications", Materials Science Forum, Vols. 492-493, pp. 725-730, 2005