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Modeling polymeric binder degradation for transport through porous green bodies
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Prati, Joseph Louis. Modeling polymeric binder degradation for transport through porous green bodies. Retrieved from https://doi.org/doi:10.7282/T3CJ8HNS

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TitleModeling polymeric binder degradation for transport through porous green bodies
NamePrati, Joseph Louis (author); Matthewson, M. John (chair); Haber, Richard A. (internal member); Birnie, Dunbar P. (internal member); Martin, Jay Ronald (outside member); Rutgers University; School of Graduate Studies
Date Created2017
Other Date2017-10 (degree)
SubjectMaterials Science and Engineering, Polymers, Binders (Materials)
Extent1 online resource (xvi, 147 p. : ill.)
DescriptionPolymers are regularly incorporated in ceramic and metallic powder processing as a binding agent that provides temporary strength to a green body prior to more permanent bonding through sintering. This allows for further processing (i.e. machining) while the material is still in its green state. However, this binder, if not removed prior to final densification, becomes an impurity and can compromise the structural integrity of the resulting product. In addition, if the binder is removed too quickly, an internal pressure buildup is generated that can cause mechanical failure. For these reasons, it becomes important to understand the binder removal process, where modeling can provide insight necessary to optimize the process. This work focused primarily on understanding the first part of binder removal: the degradation and volatilization of the binder. Numerical methods of quantifying the kinetic reaction parameters from thermogravimetic data were implemented through use of kinetic theory free of corrective fit parameters obtained empirically as used in some methods. One of the more distinguished improvements over previous studies is the generation of confidence bands on the kinetic parameters while accounting for autocorrelation of the raw data. Autocorrelation is an important artifact in thermogravimetric data were data points are influenced and correlated with prior points in a time series. This must be accounted for otherwise the fits result in tight, unrealistic confidence bands and potentially inaccurate parameters values. Kinetic parameters obtained from isothermal thermogravimetric data were used as inputs into a predictive model that approximates the degradation behavior of a test binder species under any specified heating profile fed to it. In this work, the results from the model were validated with empirical thermogravimetric data for the same binder species and heating profile. With the binder degradation and volatilization accurately being predicted, the only thing not addressed in binder removal is the mass transport when a powder species is introduced. The mathematical modeling of this task is further explained in this work as the groundwork for future studies where validation studies can be conducted.
NotePh.D.
NoteIncludes bibliographical references
Noteby Joseph Louis Prati
Genretheses, ETD doctoral
Persistent URLhttps://doi.org/doi:10.7282/T3CJ8HNS
Languageeng
CollectionSchool of Graduate Studies Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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