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1. WO2000024676 - A MOLECULAR DECOMPOSITION PROCESS FOR THE SYNTHESIS OF NANOSIZE CERAMIC AND METALLIC POWDERS

Publication Number WO/2000/024676
Publication Date 04.05.2000
International Application No. PCT/US1999/024052
International Filing Date 26.10.1999
Chapter 2 Demand Filed 26.05.2000
IPC
B22F 1/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
1Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition
B22F 9/16 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
9Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor
16using chemical processes
C01B 13/14 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
13Oxygen; Ozone; Oxides or hydroxides in general
14Methods for preparing oxides or hydroxides in general
C01F 7/02 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE EARTH METALS
7Compounds of aluminium
02Aluminium oxide; Aluminium hydroxide; Aluminates
C01F 17/00 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE EARTH METALS
17Compounds of rare earth metals
C01G 23/047 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F94
23Compounds of titanium
04Oxides; Hydroxides
047Titanium dioxide
CPC
B22F 1/0018
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
1Special treatment of metallic powder, e.g. to facilitate working, to improve properties
0003Metallic powders per se; Mixtures of metallic powders; Metallic powders mixed with a lubricating or binding agent
0007Metallic powder characterised by its shape or structure, e.g. fibre structure
0011Metallic powder characterised by size or surface area only
0018Nanometer sized particles
B22F 9/16
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
9Making metallic powder or suspensions thereof
16using chemical processes
B82Y 30/00
BPERFORMING OPERATIONS; TRANSPORTING
82NANOTECHNOLOGY
YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
30Nanotechnology for materials or surface science, e.g. nanocomposites
C01B 13/14
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
13Oxygen; Ozone; Oxides or hydroxides in general
14Methods for preparing oxides or hydroxides in general
C01F 17/206
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
17Compounds of rare earth metals
20Compounds containing only rare earth metals as the metal element
206oxide or hydroxide being the only anion
C01F 7/02
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
7Compounds of aluminium
02Aluminium oxide; Aluminium hydroxide; Aluminates
Applicants
  • UNIVERSITY OF UTAH [US]/[US] (AllExceptUS)
  • VIRKAR, Anil, Vasudeo [US]/[US] (UsOnly)
  • BHIDE, Sanjeevani, Vidyadhar [IN]/[US] (UsOnly)
Inventors
  • VIRKAR, Anil, Vasudeo
  • BHIDE, Sanjeevani, Vidyadhar
Agents
  • SONNTAG, James, L.
Priority Data
60/105,69726.10.1998US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A MOLECULAR DECOMPOSITION PROCESS FOR THE SYNTHESIS OF NANOSIZE CERAMIC AND METALLIC POWDERS
(FR) PROCEDE DE DECOMPOSITION MOLECULAIRE POUR LA SYNTHESE DE POUDRES CERAMIQUES ET METALLIQUES DE GROSSEUR NANOMETRIQUE
Abstract
(EN)
A process is disclosed for forming a nanosize ceramic powder. A precursor ceramic material is formed of a fugitive constituent and a non-soluble constituent in a single phase. The precursor is contacted with a selective solvent (water, acid, etc.) to form a solution of the fugitive constituent in the solvent and a residue of the non-soluble constituent. The precursor is sufficiently reactive with the solvent to form the solution of the fugitive constituent in the solvent and form the nondissolved residue of the non-soluble constituent. The precursor material and the non-soluble residue are sufficiently insoluble in the solvent such that there is insufficient precursor material and non-soluble residue in solution to deposit and precipitate upon the residue of the non-soluble-constituent. The fugitive constituent is sufficiently soluble in the solvent such that the precursor reacts with the solvent to form the solution of the fugitive constituent without precipitation and deposition of fugitive constituent upon the residue of the non-soluble constituent in the form of nanosize particles. After the fugitive constituent is dissolved the selective solvent containing the fugitive constituent is removed from the residue. The residue remains in the form of a nanosize powder of the non-soluble constituent.
(FR)
L'invention concerne un procédé de formation d'une poudre céramique de grosseur nanométrique. Un matériau céramique précurseur est composé d'un constituant fugitif et d'un constituant non soluble en une seule phase. On met le précurseur en contact avec un solvant sélectif (eau, acide, etc) pour former une solution du constituant fugitif dans le solvant et un résidu du constituant non soluble. Le précurseur est suffisamment réactif avec le solvant pour former la solution du constituant fugitif dans le solvant et pour former le résidu non dissous du constituant non soluble. Le matériau précurseur et le résidu non soluble sont suffisamment non insolubles dans le solvant de manière qu'il n'y ait pas assez de matériau précurseur et de résidu non soluble en solution pour former un dépôt et un précipité sur le résidu du constituant non soluble. Le constituant fugitif est suffisamment soluble dans le solvant de manière que le précurseur réagisse avec le solvant pour former la solution du constituant fugitif sans précipitation ni dépôt du constituant fugitif sur le résidu du constituant non soluble sous la forme de particules de grosseur nanométrique. Une fois le constituant fugitif dissous, le solvant sélectif contenant le constituant fugitif est extrait du résidu. Le résidu reste sous la forme d'une poudre de grosseur nanométrique du constituant non soluble.
Also published as
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