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Optimization of the Processing of 8-YSZ Powder by Powder Injection Molding for SOFC Electrolytes

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The development of a new multicomponent thermoplastic binder system for injection molding of yttria-stabilized zirconia (8-YSZ) bars based in polypropylene and paraffin wax (PW) is presented in this paper. The surface coating of YSZ powder with stearic acid in a high-performance dispersing instrument reduced the viscosity of the feedstock by one order of magnitude with respect to a feedstock with the same composition and uncoated powder. This fact allowed us to obtain a feedstock with a viscosity curve more suitable for the injection process without requiring high proportions of PW in the binder composition. The density of the samples was >98% and the conductivity of sintered parts are comparable to those of samples uniaxially compacted, around 0.10 S/cm at 900°C.
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Document Type: Research Article

Affiliations: Materials Science and Engineering Department, Universidad Carlos III de Madrid 28911, Leganés, Spain

Publication date: 2008-11-01

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