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Binder Burnout from Layers of Alumina Ceramics Under Centrifugal Force
Author(s) -
Kinemuchi Y.,
Tsugoshi T.,
Watari K.,
Ishiguro H.
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00796.x
Subject(s) - materials science , composite material , internal pressure , plasticizer , porosity , ceramic , compressive strength , delamination (geology) , porous medium , paleontology , biology , subduction , tectonics
The effect of centrifugal force on the delamination of layered green body during binder burnout has been studied in terms of internal gas pressure resulting from gas flow kinetics in porous media. Here, a sheet of nano‐particle of γ‐alumina was prepared by tape casting using polyvinyl butyral (PVB, binder) and dibutyl phthalate (DBP, plasticizer). Because of the fine pore structure (average pore size of 25 nm), molecular flow kinetics was applied to estimate internal pressure arising from evolved gases. Assuming that delamination is related to internal pressure, the interfacial strength of the layer was estimated. This strength was modified by applying a compressive pressure controlled by a centrifugal force. Because of the increased interfacial strength, delamination was suppressed, even during rapid heating. The compressive pressure required increased proportionally with increasing heating rate, a tendency that agreed with the expectation based on the gas flow kinetics in porous media.