Mechanics of constant-rate filter pressing of highly flocculated slurries

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02842.x· OSTI ID:483663

Kellett, B J ^[1]; Lin, C Y ^[2]

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1. Univ. of Cincinnati, OH (United States). Dept. of Materials Science and Engineering
2. Synchrotron Radiation Research Center, Hsin Chu (Taiwan, Province of China)

The growth of a powder compact from a highly flocculated slurry has been simulated by a computer program that models non-steady-state Darcian flow. Computer simulations have been compared with filter-pressing experiments. Constant-rate filter-pressing experiments are divided into two regimes of piston stress-displacement behavior: an initial, almost-linear, but concave-up, regime during cake growth, followed by a second region of rapidly increasing piston stress when the piston comes into contact with the cake. Linear piston stress-displacement behavior is expected, from theory based on a uniform cake model. Highly flocculated slurries show highly nonlinear behavior. Nonlinear behavior is shown to be consistent with nonuniform growth of the cake. The permeability and consolidation behavior of the cake has been determined by a consolidometer experiment. Computer simulations indicate that the particle-packing density profiles during cake build-up are surprisingly similar during cake growth. Conditions for uniform consolidation can be determined from a general equation for non-steady-state Darcian flow. Results are directly applicable to constant-flow-rate pressure casting or slip casting.

• Sponsoring Organization: National Science Foundation, Washington, DC (United States); Petroleum Research Fund (United States)
• OSTI ID: 483663
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 2 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BULK DENSITY
COMPUTERIZED SIMULATION
DARCY LAW
FLUID FLOW
PERMEABILITY
POWDERS
PRESSING
SLURRIES
STRESSES