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Formbarkeit keramischer Massen durch Extrusion
Author(s) -
Gleißle Wolfgang,
Graczyk Jan
Publication year - 1993
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.330651005
Subject(s) - extrusion , rheometry , materials science , ceramic , formability , composite material , rheology , extrusion moulding , metallurgy
Extrusion and Formability of Ceramic Pastes . Numerous complicated catalyst geometries are produced by extrusion of plastic ceramic materials. The demands on the precision of the forming process and the formability of the materials are extremely high. At a first glance, plastic ceramic materials seem to be concentrated solid‐liquid suspensions. Rheometric methods, in particular capillary rheometry, are especially suitable for testing of these materials. However, the flow processes occurring during extrusion are very complex, with many special effects such as slip, shear‐thinning, shear hardening, high entrance pressure loss. Viscosity functions are not material functions. However, in spite of these difficulties, capillary rheometry, when critically applied, is a most advantageous tool in the purposeful development of easily extrudable ceramic materials. Correlation of the rheometric test results with the extrusion process during the production of honeycomb geometries is presented using aluminium oxide ceramics as an example.