Bingham plastic fluid flow model for ceramic tape casting

Abstract

Multilayer ceramic substrates with conductor traces are attracting a great deal of attention for their ability to increase packaging density for large-scale integration circuits. Currently one of the main methods used for the manufacture of flat ceramic packages with precise thickness control and consistency is the tape casting technique. It is crucial that the green tape thickness is controlled precisely and consistently. The fluid mechanics associated with the flow of a ceramic slurry during the tape casting process is analyzed. The flow of the slurry onto the casting surface can be modeled as a two-dimensional fluid flow through a parallel channel. The material of this study is an organic-bonded glass–alumina slurry and is modeled as a Bingham plastic fluid with a yield stress. The proposed model accurately described the fluid flow characteristics of the process, and has good agreement with experimental results.