Thixotropy
Thixotropy refers to the way a slurry's viscosity changes with time and motion. In technical terms it refers to a decrease in the viscosity of a slurry when it is subjected to shearing following by a gradual recovery to the viscous state. For example, a good casting slip remains fluid after being agitated and while in use, but when allowed to stand without disturbance it gels, thus preventing settling of the materials. The tendency to gel is inherent in many ceramic minerals when they are suspended in water (generally because they contain solubles), but this tendency can be imparted to any slurry. It is the product of choice of deflocculant type and of maintaining the specific gravity and viscosity such that the slurry is not deflocculated to its most fluid state. Ceramic slurries are sometimes flocculated, or made much more viscous and less fluid for practical reasons (decorating slips stay put on vertical surfaces when flocculated).
Plastic clay is also sometimes called thixotropic. This usually refers to material that is very elastic, can be pulled and twisted like taffy, and does not set until left still for a time. Out Bound Links
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