ISSN 0004-881X

The Dependence of Particle Alignment on Processing Parameter in Alumina Tape

by N. Chantaramee*, S. Tanaka and K. Uematsu

Department of Materials Science and Technology, Nagaoka University of Technology
1603-1, Kamitomioka, Nagaoka, Niigata 940-2188 Japan

Abstract

Flow-induced particle orientation in tape casting process has been studied using aqueous slurry containing anisometric alumina particles ( á-Al₂O₃). Tape caster equipped with stationary double blades unit was carried out. The varied process parameter focused mainly on the blade length (L) and the slurry height between blades (H_slurry). Detail of aligned particle structure was examined and clarified using the polarized light microscopy. The results of particle orientation in term of long-axes alignment showed either a non-uniform structure (Type-I) or a relatively uniform structure (Type-II) depending on ratio. The process of higher number of ratio were likely to produce Type-I structure (long-axes gradually deviated from the casting direction as approaching to carrier surface), whereas process of lower number were responsible for Type-II structure (long-axes dominated in the casting direction).

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