A Rheological Study of Ceramic Suspensions at Very Low Shearing Stresses.
Technical rept. Aug 69-Dec 71,
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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The rheological behavior of aqueous suspensions of ceramic materials was investigated at very low shearing stresses. A sensitive coaxial cylinder viscometer of original design was used. A sanitaryware slip was studied in this investigation. Flow behavior was studied at various stages during the coagulation process and again after the slip was fully gelled. The results of this study revealed that coagulation occurred even in slips carried to the lowest point on their deflocculation curve. With regard to low-shear slip rheology, this study indicated that the flow of the gelled suspensions at low stresses was viscoelastic in nature. Several flow regions were found to exist. At extremely low stresses, no measureable response was observed. At somewhat higher stresses, purely elastic behavior was noted for the under-deflocculated slips. At still higher stresses, in addition to elasticity, a region of creep was observed which was Newtonian up to stress levels at which breakdown occurred. Above these stress levels, the gel network was destroyed and accelerated flow began. Author
- Ceramics, Refractories and Glass