Highly porous ceramic and metal aerogels from xerogel powder precursors, and methods for their production and use
US10669212B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2018 |
| Grant date | Jun 2, 2020 |
| Priority date | — |
| Expiry date | Dec 19, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/663
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention discloses novel methods for producing highly porous ceramic and/or metal aerogel monolithic objects that are hard, sturdy, and resistant to high temperatures. These methods comprise preparing nanoparticulate oxides of metals and/or metalloids via a step of vigorous stirring to prevent gelation, preparing polymer-modified xerogel powder compositions by reacting said nanoparticulate oxides with one or more polyfunctional monomers, compressing said polymer-modified xerogel powder compositions into shaped compacts, and carbothermal conversion of the shaped xerogel compacts via pyrolysis to provide the highly porous ceramic and/or metal aerogel monolithic objects that have the same shapes as to their corresponding xerogel compact precursors. Representative of the highly porous ceramic and/or metal aerogel monolithic objects of the invention are ceramic and/or metal aerogels of Si, Zr, Hf, Ti, Cr, Fe, Co, Ni, Cu, Ru, Au, and the like. Examples include sturdy, shaped, highly porous silicon carbide (SiC), silicon nitride (Si3N4), zirconium carbide (ZrC), hafnium carbide (HfC), chromium carbide (Cr3C2), titanium carbide (TiC), zirconium boride (ZrB2), hafnium boride (H…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.