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Title: 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.:
Lockheed Martin Energy Syst Inc
OSTI Identifier:
170444
Patent Number(s):
5,480,696
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 = {1996},
month = {1}
}