Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1993-07-09
1994-12-27
Thomas, Alexander S.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
428 76, 428 68, 428 69, 423335, B32B 516
Patent
active
053764498
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 tetraakyl 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.
REFERENCES:
patent: 4636415 (1987-01-01), Barito et al.
patent: 4681788 (1987-07-01), Barito et al.
"Controlled Growth of Monodisperse Silica Spheres in the Micron Size Range", W. Stober et al., Journal of Colloid and Interface Science, vol. 26, Dec. 1968, pp. 62-69.
Basaran Osman A.
Harris Michael T.
Kollie Thomas G.
Weaver Fred J.
Adams Harold W.
Larcher Earl
Martin Marietta Energy Systems Inc.
Stafford Shelley L.
Thomas Alexander S.
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