Title:
Characterization of material behavior during the manufacturing process of a co-extruded solid oxide fuel cell

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dc.contributor.advisor McDowell, David L.
dc.contributor.author Eisele, Prescott L. (Prescott Lawrence) en_US
dc.contributor.committeeMember Cochran, Joe
dc.contributor.committeeMember Lee, Jim
dc.contributor.committeeMember Neu, Richard
dc.contributor.department Mechanical Engineering en_US
dc.date.accessioned 2005-03-03T21:52:51Z
dc.date.available 2005-03-03T21:52:51Z
dc.date.issued 2004-04-08 en_US
dc.description.abstract Recent developments in powder metal oxide processing have enabled co-extrusion of a honeycomb structure with alternating layers of metal and ceramic. Such a structure is envisioned for use as a Solid Oxide Fuel Cell (SOFC) if defects can be minimized during the manufacturing process. The two dissimilar materials tend to shrink at different rates during hydrogen reduction and sintering, inducing internal stresses that lead to structural defects such as cracks, or high residual stresses. The objective of this thesis is to characterize the shrinkage and relaxation mechanisms inherent in both the metal and ceramic so that internal stresses developed during manufacturing can be estimated and ultimately minimized. Constitutive models are adapted from the literature to simulate the sintering and viscoelastic behaviors of the ceramic. Likewise, existing models in the literature are used to characterize the viscoplastic relaxation of the porous powder metal phase and its sintering behavior. Empirical models are developed for the reduction behavior of the metal oxides, based on a series of experiments conducted that measure water vapor (hygrometry) and dimensional change (dilatometry) during reduction and sintering. Similarly, the necessary parameters for the sintering model and viscoplastic model were determined through a series of experiments. The constructed system of constitutive equations appears to have the essential elements for modeling dimensional change, porosity/strength and development of internal (residual) stresses in co-extruded SOFC structures. en_US
dc.description.degree M.S. en_US
dc.format.extent 8119941 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/5157
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Sintering en_US
dc.subject Reduction
dc.subject LCA
dc.subject LCM
dc.subject Powder process
dc.subject Fuel cell
dc.subject SOFC
dc.subject Shrinkage
dc.subject Laminates
dc.title Characterization of material behavior during the manufacturing process of a co-extruded solid oxide fuel cell en_US
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor McDowell, David L.
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication ce593c62-37f0-4d6f-a241-a83c373faa3e
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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