MODELING OF THE PRESSURE IN 1-D GREEN CERAMIC BODIES DURING DEPRESSURIZATION FROM CONDITIONS OF SUPERCRITICAL EXTRACTION OF BINDER

摘要

Supercritical extraction is an alternative to thermal decomposition for removing binder from green ceramic bodies. After depressurization from the conditions of supercritical extraction, defects are sometimes observed in the green ceramic components, and these are attributed to gradients in pressure in the green ceramic body that arise during depressurization. The pressure gradients are modeled with Darcy's Law for describing flow in porous media, and two types of depressurization modes are examined: step changes in pressure and linear changes in pressure with time.