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

Issue Date:: 1997-02-18

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

OSTI Identifier:: 441870

Patent Number(s):: 5603819

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

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                    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.

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                    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.

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                    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.

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@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}

}

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