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

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

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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. 3 figs.

Inventors:: Harris, M.T.; Basaran, O.A.; Sisson, W.G.; Brunson, R.R.

Issue Date:: 1997-02-18

OSTI Identifier:: 441870

Assignee:: Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; SCA: 360201; PA: EDB-97:041587; SN: 97001739252

Patent Number(s):: US 5,603,819/A/

Application Number:: PAN: 8-257,423

Contract Number:: AC05-84OR21400

Resource Relation:: Other Information: PBD: 18 Feb 1997

Research Org:: Lockheed Martin Energy Syst Inc

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; OXIDES; SILICON OXIDES; ELECTROREFINING; CHEMICAL PREPARATION; ELECTRIC FIELDS; MORPHOLOGY; PRECURSOR; MICROSTRUCTURE; CERAMICS

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