Invention Grant
- Patent Title: Hollow ceramic fibers, precursors for manufacture thereof utilizing pore formers, methods of making the same, and methods of using the same
- Patent Title (中): 中空陶瓷纤维，使用成孔剂制造的前体，其制造方法及其使用方法
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Application No.: US13194995Application Date: 2011-07-31
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Publication No.: US08741031B2Publication Date: 2014-06-03
- Inventor: Madhava R. Kosuri , Dean W. Kratzer
- Applicant: Madhava R. Kosuri , Dean W. Kratzer
- Applicant Address: FR Paris
- Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
- Current Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
- Current Assignee Address: FR Paris
- Agent Christopher J. Cronin
- Main IPC: B01D53/22
- IPC: B01D53/22 ; B01D69/08 ; B01D69/10 ; B29C47/06
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.
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