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Interceram is SCOPUS-listed!
SCImago Journal & Country Rank

  Seffern, P. ; Klein, Gernot ; Engels, M. ; Miehling, M.
Novel Procedures for Determining the Static and Dynamic Flow Behavior of Suspensions Containing Clay Minerals
Interceram 66 (2017) [1] 10-18
Raw Materials Worldwide


Abstract:
The development towards increasing processing speeds and more complex procedures in molding and slip casting within the ceramic industry is leading to reject rates between 5 and 10 %. The influences of mineralogy, chemical composition, grain size and shape, and many other factors, are generally inadequately considered. Moreover, there is a general lack of rheological procedures and parameters for quantifying the flow behavior of raw materials containing clay minerals. Dynamic behavior is evaluated by recording structural conditions and the associated times. This approach generates comparative values that are adequate for quality control but it does not deliver information about the real behavior of the dispersion (slurry). A novel analytical method, which generates information on the rate of construction and destruction of structure, will be shown. Furthermore, combinations of thixotropic and rheopectic reactions are recorded and included in the method. As a result of there being several alternative procedures for measuring the static behavior of clay mineral slurries, large variations in measurement values are observed. A unified measurement procedure and factors relating to raw materials that influence flow behavior is presented.

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