Properties and characterization of an oxide/oxide composite filter

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:504650

Lane, J E; Painter, C J; Su, W F.A.; Radford, K C ^[1]; LeCostaouec, J F ^[2]

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1. Westinghouse Electric Corp., Pittsburgh, PA (United States). Science and Technology Center
2. Techniweave, Inc., Rochester, NH (United States)

Westinghouse, with Techniweave as a major subcontractor, is conducting a three-phase program aimed at providing advanced candle filters for a 1997 pilot scale demonstration in one of the two hot gas filter system at Southern Company Service`s Wilsonville PSD Facility. This program`s objective is to develop an oxide CFCC (continuous fiber ceramic composite) candle filter that is cost competitive with prototype next generation filters through the development of a low cost sol-gel fabrication process and a 3D fiber architecture optimized for high volume filter manufacturing. Phase 1, Filter Material Development and Evaluation, results will be presented. Phase 1 activities included laboratory-scale development, characterization, and testing of a mullite matrix 3D fiber-reinforced (Nextel 550) ceramic composite filter material. Eleven 3D architectures were designed, preforms and ceramic matrix composite (CMC) filter materials were made, tested and evaluated. The CMC fabrication process was optimized for reduced cost and acceptable filter performance. Permeability, 4-pt bend and microstructural evaluation results, previously presented, were used to downselect to one 3D architecture and CMC processing method. The downselected filter material was fabricated and tested via permeability and 4-pt bend; Weibull modulus was determined. High-temperature flow-through corrosion tests and thermal aging tests in static air up to 5,000 h were conducted. SEM and XRD have been used to characterize microstructural and phase changes, if any, from high temperature exposure testing. Weaving feasibility studies for the flange and the closed end of a candle filter have been conducted in order to develop a low cost weaving method to make a single piece candle filter fiber preform. Results and conclusions for the evaluation of the downselected filter material above will be presented and discussed.

• OSTI ID: 504650
• Report Number(s): CONF-960954--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
CERAMICS
COAL GASIFICATION
COMPOSITE MATERIALS
FABRICATION
HOT GAS CLEANUP
MECHANICAL FILTERS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MULLITE
THERMODYNAMIC PROPERTIES