Silica powders for powder evacuated thermal insulating panel and method
Abstract
A powder evacuated thermal insulating panel using generally spherical and porous silica particles of a median size less than about 100 nanometers in diameter, a pour packing density of about 0.4 to 0.6 g/cm{sup 3} and an external surface area in the range of about 90 to 600 m{sup 2}/g is described. The silica powders are prepared by reacting a tetraalkyl silicate with ammonia and water in an alcohol solvent, distilling the solution after the reaction to remove the ammonia and recover the alcohol. The resulting aqueous slurry was dried, ball-milled, and dried again to provide the silica particles with defined internal and external porosity. The nanometer size and the large external surface area of the silica particles along with the internal and external porosity of the silica particles provide powder evacuated thermal insulating panels with significantly higher R-values than obtainable using previously known silica powders. 2 figs.
- Inventors:
- Issue Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- OSTI Identifier:
- 170444
- Patent Number(s):
- 5480696
- Application Number:
- PAN: 8-298,719
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 2 Jan 1996
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; THERMAL INSULATION; DESIGN; MATERIALS; SILICON OXIDES; CHEMICAL PREPARATION; BULK DENSITY; PARTICLE SIZE; SPHERICAL CONFIGURATION; R FACTORS; LOW PRESSURE
Citation Formats
Harris, M T, Basaran, O A, Kollie, T G, and Weaver, F J. Silica powders for powder evacuated thermal insulating panel and method. United States: N. p., 1996.
Web.
Harris, M T, Basaran, O A, Kollie, T G, & Weaver, F J. Silica powders for powder evacuated thermal insulating panel and method. United States.
Harris, M T, Basaran, O A, Kollie, T G, and Weaver, F J. Tue .
"Silica powders for powder evacuated thermal insulating panel and method". United States.
@article{osti_170444,
title = {Silica powders for powder evacuated thermal insulating panel and method},
author = {Harris, M T and Basaran, O A and Kollie, T G and Weaver, F J},
abstractNote = {A powder evacuated thermal insulating panel using generally spherical and porous silica particles of a median size less than about 100 nanometers in diameter, a pour packing density of about 0.4 to 0.6 g/cm{sup 3} and an external surface area in the range of about 90 to 600 m{sup 2}/g is described. The silica powders are prepared by reacting a tetraalkyl silicate with ammonia and water in an alcohol solvent, distilling the solution after the reaction to remove the ammonia and recover the alcohol. The resulting aqueous slurry was dried, ball-milled, and dried again to provide the silica particles with defined internal and external porosity. The nanometer size and the large external surface area of the silica particles along with the internal and external porosity of the silica particles provide powder evacuated thermal insulating panels with significantly higher R-values than obtainable using previously known silica powders. 2 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 02 00:00:00 EST 1996},
month = {Tue Jan 02 00:00:00 EST 1996}
}