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

United States Patent

5,603,819
February 18, 1997
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
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.
Harris; Michael T. (Knoxville, TN), Basaran; Osman A. (Oak Ridge, TN), Sisson; Warren G. (Oak Ridge, TN), Brunson; Ronald R. (Lenoir City, TN)
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
08/ 257,423
June 9, 1994
The United States Government has rights in this invention pursuant to contract no. DE-AC05-840R21400 between the United States Department of Energy and Martin Marietta Energy Systems, Inc., and funded by the Office of Basic Energy Sciences.