Hollow ceramic fibers, precursors for manufacture thereof utilizing pore formers, methods of making the same, and methods of using the same
US8741031B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2011 |
| Grant date | Jun 3, 2014 |
| Priority date | — |
| Expiry date | Jun 19, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02C20/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A composite hollow ceramic fiber includes a porous hollow core supporting a thin, dense sheath. The non-gas-tight core comprises a first ceramic material and an interconnecting network of pores. The gas-tight sheath comprises a second ceramic material. The fiber is made by extruding core and sheath suspensions from a spinnerette. The core suspension includes particles of the first ceramic material, a polymeric binder, a solvent, and a pore former material insoluble in the solvent. The sheath suspension includes particles of the second ceramic material, a polymeric binder and a solvent. The nascent hollow fiber is coagulated in a coagulant bath to effect phase inversion of the polymeric binders. The resultant green fiber is sintered in a two step process. First, the binders and pore former material are burned off. Second, the sheath is densified and the second ceramic material is sintered without fully sintering the core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.