Quasi-steady state power law model for flow of (La_0·85Sr_0·15)_0·9MnO₃ ceramic slurry in tape casting

摘要

One of the most common ways used to produce multilayer ceramics is tape casting. In thisprocess, the wet tape thickness is one of the single most determining parameters affecting thefinal properties of the product, and it is therefore of great interest to be able to control it. In thepresent work, the flow in the doctor blade region of a slurry containing (La0?85Sr0?15)0?9MnO3 (LSM)material is described with a simple quasi-steady momentum equation in combination with anOstwald–de Waele power law constitutive equation. Based on rheometer experiments, theconstants in the Ostwald–de Waele power law are identified for the considered LSM material andapplied in the analytical solution for the tape thickness. This solution is then used for differentvalues of substrate velocity and doctor blade height and compared with experimental findings ofthe wet tape thickness, and good agreement is found.