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US 5,358,695 AGranted
Process for producing nanoscale ceramic powders
AssigneePhysical Sciences, Inc.
InventorsJoseph J. Helble, Gary A. Moniz, Joseph R. Morency
Life of this patent
Estimating the term…
Abstract
Submicron sized ceramic particles are produced by combining a ceramic precursor with an organic or carbonaceous carrier material, and exposing droplets of the mixture to a temperature sufficient to cause combustion of the organic material and subsequent vaporization and nucleation, or diffusion and oxidation, of the ceramic precursor to form pure, crystalline, uniform nanophase ceramic particles.
Claims12
A process for producing nanometer sized ceramic particles comprising the steps of:
- combining a ceramic precursor with a carbohydrate carrier material forming a combination in which the precursor is associated with the carrier material;
- atomizing the combination thereby forming an aerosol;
- exposing the aerosol to a temperature above about 1000 K. thereby causing combustion of the carrier material and vaporization and nucleation, or diffusion and oxidation, of the ceramic precursor thereby forming substantially non-agglomerated ceramic particles having a diameter of less than 100 nm.
A process for producing crystalline, nanophase ceramic particles comprising the steps of
- combining a carbohydrate carrier material and an inorganic ceramic precursor to form a mixture thereof;
- atomizing or grinding the mixture to form a powder;
- introducing an aerosol of the powder into a reactor having a temperature above about 1000 K and an oxygen concentration in the range of about 20 to about 100%, thereby causing combustion of the carbohydrate material and vaporization and nucleation or diffusion and oxidation of the ceramic precursor resulting in formation of substantially non-agglomerated crystalline ceramic particles having a diameter of less than 100 mn.
Dependencies are inferred from the claim text.