A series of fine-grade alumina powders has been used in combination with maize
starch granules to produce porous structures for porous hydrostatic journal-
bearing applications. A comprehensive series of tests was conducted to
characterize porosity in terms of density, pore size, and permeability.
Successful processing of quality journal-bearing components has been
demonstrated for preferred combinations of alumina size and starch content,
using fixed-processing parameters. The new porous ceramic bearings showed
consistent and reproducible properties and are suitable for a wide range of
higher precision engineering applications. The porous ceramic-bearing processing
route has also proved to be low cost and environmentally sound
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