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Title: Densification of alkoxide-derived fine silica powder compact by ultra-high-pressure cold isostatic pressing

Abstract

Powder compacts of alkoxide-derived fine silica powders were consolidated into a highly dense and uniform structure by ultra-high-pressure cold isostatic pressing of granules with controlled structure. The diameters of spherical and nearly monosized amorphous silica particles, prepared from metal alkoxide, were successfully controlled in the range of 9 to 760 nm by varying the concentration of ammonia. Close-packed granules of these powders were produced by spray drying. These powders were isostatically pressed up to 1 GPa at room temperature. Although the average particle diameter was less than 100 nm, the maximum relative density of the compacts was more than 78% of theoretical density. The optimum particle size to obtain highly dense compacts was in the range of 30 to 300 nm at 1 GPa. Furthermore, the ratio of mode pore diameter in these compacts to particle diameter was less than 0.155, which corresponded to the minimum ratio of calculated three-particle pore channel radii for hexagonal close packing. Viscous deformation of particles under ultra-high isostatic pressure played an important role in the densification of the compacts.

Authors:
 [1];  [2]; ;  [1]
  1. Nagoya Univ., Nagoya (Japan). Dept. of Chemical Engineering
  2. Toyota Technological Inst., Nagoya (Japan)
Publication Date:
OSTI Identifier:
6326510
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society; (United States)
Additional Journal Information:
Journal Volume: 76:1; Journal ID: ISSN 0002-7820
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SILICON OXIDES; COLD PRESSING; ALKOXIDES; AMMONIA; COMPACTS; DEFORMATION; DENSITY; HIGH PRESSURE; PARTICLE SIZE; POROSITY; POWDERS; SPRAY DRYING; SUSPENSIONS; CHALCOGENIDES; DISPERSIONS; DRYING; FABRICATION; HYDRIDES; HYDROGEN COMPOUNDS; MATERIALS WORKING; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; PRESSING; SILICON COMPOUNDS; SIZE; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Kamiya, Hidehiro, Suzuki, Hisao, Kato, Daisuke, and Jimbo, Genji. Densification of alkoxide-derived fine silica powder compact by ultra-high-pressure cold isostatic pressing. United States: N. p., 1993. Web. doi:10.1111/j.1151-2916.1993.tb03689.x.
Kamiya, Hidehiro, Suzuki, Hisao, Kato, Daisuke, & Jimbo, Genji. Densification of alkoxide-derived fine silica powder compact by ultra-high-pressure cold isostatic pressing. United States. https://doi.org/10.1111/j.1151-2916.1993.tb03689.x
Kamiya, Hidehiro, Suzuki, Hisao, Kato, Daisuke, and Jimbo, Genji. 1993. "Densification of alkoxide-derived fine silica powder compact by ultra-high-pressure cold isostatic pressing". United States. https://doi.org/10.1111/j.1151-2916.1993.tb03689.x.
@article{osti_6326510,
title = {Densification of alkoxide-derived fine silica powder compact by ultra-high-pressure cold isostatic pressing},
author = {Kamiya, Hidehiro and Suzuki, Hisao and Kato, Daisuke and Jimbo, Genji},
abstractNote = {Powder compacts of alkoxide-derived fine silica powders were consolidated into a highly dense and uniform structure by ultra-high-pressure cold isostatic pressing of granules with controlled structure. The diameters of spherical and nearly monosized amorphous silica particles, prepared from metal alkoxide, were successfully controlled in the range of 9 to 760 nm by varying the concentration of ammonia. Close-packed granules of these powders were produced by spray drying. These powders were isostatically pressed up to 1 GPa at room temperature. Although the average particle diameter was less than 100 nm, the maximum relative density of the compacts was more than 78% of theoretical density. The optimum particle size to obtain highly dense compacts was in the range of 30 to 300 nm at 1 GPa. Furthermore, the ratio of mode pore diameter in these compacts to particle diameter was less than 0.155, which corresponded to the minimum ratio of calculated three-particle pore channel radii for hexagonal close packing. Viscous deformation of particles under ultra-high isostatic pressure played an important role in the densification of the compacts.},
doi = {10.1111/j.1151-2916.1993.tb03689.x},
url = {https://www.osti.gov/biblio/6326510}, journal = {Journal of the American Ceramic Society; (United States)},
issn = {0002-7820},
number = ,
volume = 76:1,
place = {United States},
year = {1993},
month = {1}
}