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

Abstract

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:
; ; ;
Issue Date:
Research Org.:
Lockheed Martin Energy Syst Inc
OSTI Identifier:
441870
Patent Number(s):
5,603,819
Application Number:
PAN: 8-257,423
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States)
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 18 Feb 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; OXIDES; SILICON OXIDES; ELECTROREFINING; CHEMICAL PREPARATION; ELECTRIC FIELDS; MORPHOLOGY; PRECURSOR; MICROSTRUCTURE; CERAMICS

Citation Formats

Harris, M T, Basaran, O A, Sisson, W G, and Brunson, R R. Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation. United States: N. p., 1997. Web.
Harris, M T, Basaran, O A, Sisson, W G, & Brunson, R R. Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation. United States.
Harris, M T, Basaran, O A, Sisson, W G, and Brunson, R R. Tue . "Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation". United States.
@article{osti_441870,
title = {Variation of the shape and morphological properties of silica and metal oxide powders by electro homogeneous precipitation},
author = {Harris, M T and Basaran, O A and Sisson, W G and Brunson, R R},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {2}
}