Continuous process for production of fine particulate ceramics
AssigneeAllied-Signal Inc.
InventorJean Yamanis
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Abstract
A process is comprised of continuously producing a fine ceramic powder by drying at supercritical conditions. The feed is a sol of ceramic oxides or hydrous oxides which is continuously pressurized and heated to in excess of the critical temperature and pressure of the sol solvent. The solvent transforms to a gas and separates from the fine particulate ceramic oxide powder, which remains in a highly divided state.
Claims21
A process for the continuous production of an extremely fine particle ceramic powder comprising forming a sol of a ceramic oxide or hydrous oxide having a liquid phase, pressurizing said sol above the critical pressure of the liquid phase, continuously feeding said pressurized sol into a heating zone, heating said pressurized sol in said heating zone to a temperature above its critical temperature wherein said liquid transforms to a gaseous phase and forms a fine particulate ceramic powder suspended in the gaseous phase, discharging said ceramic powder and gaseous phase from said heated zone while undergoing substantially adiabatical expansion and removing the ceramic powder from said gaseous phase.
The process of claim 21 wherein said hydrocarbon chain has 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.