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

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.
Inventors:
 [1];  [2];  [2];  [3]
  1. (Knoxville, TN)
  2. (Oak Ridge, TN)
  3. (Lenoir City, TN)
Issue Date:
OSTI Identifier:
870836
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5603819
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
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; /205/

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