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Title: Ceramic fiber reinforced filter

A filter for removing particulate matter from high temperature flowing fluids, and in particular gases, that is reinforced with ceramic fibers. The filter has a ceramic base fiber material in the form of a fabric, felt, paper of the like, with the refractory fibers thereof coated with a thin layer of a protective and bonding refractory applied by chemical vapor deposition techniques. This coating causes each fiber to be physically joined to adjoining fibers so as to prevent movement of the fibers during use and to increase the strength and toughness of the composite filter. Further, the coating can be selected to minimize any reactions between the constituents of the fluids and the fibers. A description is given of the formation of a composite filter using a felt preform of commercial silicon carbide fibers together with the coating of these fibers with pure silicon carbide. Filter efficiency approaching 100% has been demonstrated with these filters. The fiber base material is alternately made from aluminosilicate fibers, zirconia fibers and alumina fibers. Coating with Al.sub.2 O.sub.3 is also described. Advanced configurations for the composite filter are suggested.
Authors:
 [1] ;  [2] ;  [3]
  1. (Knoxville, TN)
  2. (Oak Ridge, TN)
  3. (Powell, TN)
Publication Date:
OSTI Identifier:
868101
Report Number(s):
US 5075160
DOE Contract Number:
AC05-84OR21400
Resource Type:
Patent
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
ceramic; fiber; reinforced; filter; filter; removing; particulate; matter; temperature; flowing; fluids; particular; gases; reinforced; ceramic; fibers; filter; ceramic; base; fiber; material; form; fabric; paper; refractory; fibers; coated; layer; protective; bonding; refractory; applied; chemical; vapor; deposition; techniques; coating; causes; fiber; physically; joined; adjoining; fibers; prevent; movement; fibers; increase; strength; toughness; composite; filter; coating; selected; minimize; reactions; constituents; fluids; fibers; formation; composite; filter; preform; commercial; silicon; carbide; fibers; coating; fibers; pure; silicon; carbide; filter; efficiency; approaching; 100; demonstrated; filters; fiber; base; material; alternately; aluminosilicate; fibers; zirconia; fibers; alumina; fibers; coating; described; advanced; configurations; composite; filter; suggested; removing particulate; zirconia fibers; ceramic fibers; flowing fluid; carbide fibers; composite filter; composite filter; composite filter; particulate matter; chemical vapor; silicon carbide; silicon carbide; vapor deposition; base material; ceramic fiber; ceramic fiber; deposition techniques; base mat; refractory fibers; physically joined; pure silicon; deposition technique; particular gases; fiber reinforced; temperature flow; fiber base; zirconia fiber /442/210/423/427/428/