Aerogel compositions for high temperature applications
Aerogel materials, aerogel composites, and the like may be improved by the addition of opacifiers to reduce the radiative component of heat transfer. Such aerogel materials, aerogel composites, and the like may also be treated to impart or improve hydrophobicity. Such aerogel materials and methods of manufacturing the same are described.
1. A method of insulating a surface comprising:
providing a composition comprising a silica aerogel matrix material embedding one or more fillers, the composition being conformable to the surface, the silica aerogel matrix material further comprising a hydrated filler comprising a carbonate embedded in the silica aerogel matrix material, an opacifying compound embedded within the silica aerogel matrix material, and hydrophobic materials attached to a surface of the silica aerogel matrix material, wherein the opacifying compound is embedded within the silica aerogel matrix material; and
applying the composition on the surface.
2. The method of claim 1 , wherein the composition further comprises a fibrous structure.
3. The method of claim 2 , wherein the fibrous structure is in a woven, nonwoven, mat, felt, batting, or a combination thereof.
4. The method of claim 1 , wherein the opacifying compound is selected from the group consisting of B 4 C, Diatomite, Manganese ferrite, MnO, NiO, SnO, Ag 2 O, Bi 2 O 3 , TiC, WC, carbon black, titanium oxide, iron titanium oxide, zirconium silicate, zirconium oxide, iron (I) oxide, iron (III) oxide, manganese dioxide, iron titanium oxide (ilmenite), chromium oxide, silicon carbide, and combinations thereof.
5. The method of claim 1 , wherein the opacifying compound comprises silicon carbide.
6. The method of claim 1 , wherein the hydrated filler further comprises at least one additional filler that includes hydroxides, borates, silicates, oxides, or combinations thereof.
7. The method of claim 6 , wherein the hydroxides comprise metal hydroxides.
8. The method of claim 7 , wherein the metal hydroxides comprise magnesium hydroxide.
9. The method of claim 7 , wherein the metal hydroxides comprise aluminum hydroxide.
10. The method of claim 7 , wherein the metal hydroxides are present at a level of 1 to 40 percent by weight of the composition.
11. The method of claim 6 , wherein the borates comprise zinc borate.
12. The method of claim 11 , wherein the zinc borate is present at a level of 1 to 40 percent by weight of the composition.
13. The method of claim 6 , wherein the silicates comprise aluminum silicate.
14. The method of claim 13 , wherein the aluminum silicate is present at a level of less than 50 percent by weight of the composition.
15. The method of claim 13 , wherein the aluminum silicate is present at a level of 5 to 50 percent by weight of the composition.
16. The method of claim 6 , wherein the oxides comprise aluminum oxide.
17. The method of claim 16 , wherein the aluminum oxide comprises aluminum oxide hydroxide.
18. The method of claim 1 , wherein the carbonate comprise a hydrated metal carbonate.
19. The method of claim 18 , wherein the hydrated metal carbonate is present at a level of 1 to 40 percent by weight of the composition.
20. A method of insulating a surface:
providing a conformable composition comprising a silica aerogel matrix material embedding one or more fillers, the conformable composition being conformable to the surface, the silica aerogel material further comprising a hydrated filler comprising a carbonate embedded in the silica aerogel matrix material, an opacifying compound embedded within the silica aerogel material, a smoke suppressing filler and hydrophobic materials attached to a surface of the silica aerogel material, wherein the smoke suppressing filler and the opacifying compound are embedded within the monolithic silica aerogel material;
applying the conformable composition to the surface; and
conforming the conformable composition to the surface.