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

Patent · Wed Jan 01 00:00:00 EST 1997

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: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• 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

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