The Role of Rheology on the Shaping Technology of Ceramic Materials

Abstract

The role of rheology on the shaping technology of ceramic materials has been investigated. It was found that the following classification is adequate to describe the rheological characteristics of relevant systems:
(I) the powder system is described as elastico-plastico-viscous solid,
(II) the slurry system, as elastico-plastico-viscous liquid, and
(III) the mud system, as elastico-plastico-viscous solid and liquid, having intermediate character between plastic solid and plastic liquid.
The extended Ostwald flow pattern was studied over a very wide range of shearing rate, in slurry stage. In order to describe a compaction character in powder stage, relaxation properties were studied. And, in mud stage, de-airing process was analysed on the standpoint of rheological phenomenon.