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Rheological Investigation of Suspensions and Ceramic Pastes: Characterization of Extrusion Properties
A large number of complicated catalyst geometries are produced by extrusion of plastic ceramic materials. The demands for high precision in the forming process and adequate formability of the materials are extremely stringent. As a first approximation, plastic ceramic materials can be treated as ordinary concentrated 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 wall slip, shear-thinning, shear hardening and high entrance pressure loss. As a result, apparent viscosity functions are not material functions. In spite of these difficulties, capillary rheometry, when critically applied, is an advantageous tool in the development of easily extrudable ceramic materials. The correlation of rheometrical test results with the extrusion process during production of honeycomb geometries is presented using aluminium oxide ceramics as an example.
Rheological Investigation of Suspensions and Ceramic Pastes: Characterization of Extrusion Properties
A large number of complicated catalyst geometries are produced by extrusion of plastic ceramic materials. The demands for high precision in the forming process and adequate formability of the materials are extremely stringent. As a first approximation, plastic ceramic materials can be treated as ordinary concentrated 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 wall slip, shear-thinning, shear hardening and high entrance pressure loss. As a result, apparent viscosity functions are not material functions. In spite of these difficulties, capillary rheometry, when critically applied, is an advantageous tool in the development of easily extrudable ceramic materials. The correlation of rheometrical test results with the extrusion process during production of honeycomb geometries is presented using aluminium oxide ceramics as an example.
Rheological Investigation of Suspensions and Ceramic Pastes: Characterization of Extrusion Properties
Wolfgang Gleißle (author) / Jan Graczyk (author) / Hans Buggisch (author)
2014
Article (Journal)
Electronic Resource
Unknown
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