Global to push GA events into
skip to main content

Title: Silica powders for powder evacuated thermal insulating panel and method

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:
OSTI Identifier:
170444
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; SCA: 320107; PA: EDB-96:027213; SN: 96001517593
Patent Number(s):
US 5,480,696/A/
Application Number:
PAN: 8-298,719
Contract Number:
AC05-84OR21400
Resource Relation:
Other Information: PBD: 2 Jan 1996
Research Org:
Lockheed Martin Energy Syst Inc
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

Similar records in DOepatents and OSTI.GOV collections: