Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation

Patent · Tue Dec 31 23:00:00 EST 1996

OSTI ID:870836

Harris, Michael T ^[1]; Basaran, Osman A ^[2]; Sisson, Warren G ^[2]; Brunson, Ronald R ^[3]

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1. Knoxville, TN
2. Oak Ridge, TN
3. Lenoir City, TN

The present invention provides a method for preparing irreversible linear aggregates (fibrils) of metal oxide powders by utilizing static or pulsed DC electrical fields across a relatively non-conducting liquid solvent in which organometal compounds or silicon alkoxides have been dissolved. The electric field is applied to the relatively non-conducting solution throughout the particle formation and growth process promoting the formation of either linear aggregates (fibrils) or spherical shaped particles as desired. Thus the present invention provides a physical method for altering the size, shape and porosity of precursor hydrous metal oxide or hydrous silicon oxide powders for the development of advanced ceramics with improved strength and insulating capacity.

• Research Organization: LOCKHEED MARTIN ENRGY SYST INC
• DOE Contract Number: AC05-84OR21400
• Assignee: Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
• Patent Number(s): US 5603819
• OSTI ID: 870836
• Country of Publication: United States
• Language: English

Related Subjects

/205/
advanced
advanced ceramics
aggregates
alkoxides
altering
applied
capacity
ceramics
compounds
conducting liquid
dc
dc electric
desired
dissolved
electric
electric field
electrical
electrical field
electrical fields
electro
fibrils
field
fields
formation
growth
growth process
homogeneous
homogeneous precipitation
hydrous
hydrous metal
improved
improved strength
insulating
insulating capacity
irreversible
linear
liquid
liquid solvent
metal
metal compound
metal compounds
metal oxide
method
morphological
non-conducting
organometal
oxide
oxide powder
oxide powders
particle
particle form
particle formation
particles
physical
porosity
powders
precipitation
precursor
preparing
process
promoting
properties
provides
pulsed
relatively
shape
shaped
shaped particles
silica
silicon
silicon oxide
size
solution
solvent
spherical
spherical shape
spherical shaped
static
strength
throughout
utilizing
variation