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US 5,780,126 AGranted
Filter material
AssigneesMinnesota Mining and Manufacturing Company, Hexcel Corporation
InventorsRobert G. Smith, Joseph H. Eaton, Edward M. Fischer, Larry R. Visser, Venecia M. Grobelny, Kevin D. McVicker
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Abstract
Fluid permeable filter material comprising a self supporting fluid permeable wall and a fluid permeable filter layer. The self supporting wall comprises ceramic oxide fibers, ceramic oxide particles, and silicate ceramic oxide bonding phase. The filter layer comprises non-woven ceramic oxide fibers and silicate ceramic oxide bonding phase.
Claims26
A filter material comprising:
- (a) a self supporting fluid permeable wall comprising:
- (i) first woven, braided, knitted, or filament wound ceramic oxide fibers;
- (ii) first ceramic oxide particles;
- and
- (iii) a first silicate ceramic oxide bonding phase, said first ceramic oxide particles being interspersed about said first ceramic oxide fibers, and said first ceramic oxide bonding phase bonding said first particles and said first fibers together;
- and
- (b) a fluid permeable filter layer on said wall, said filter layer being less permeable than said fluid permeable wall, and comprising:
- (i) non-woven second ceramic oxide fibers;
- and
- (ii) a second silicate ceramic oxide bonding phase bonding to said second fibers, said filter layer being arranged such that said filter material is permeable.
7 more elements
A method for making a filter material, said method comprising the steps of:
- (a) preparing filter material preform comprising:
- (A) a ceramic oxide fabric saturated with a first composition comprising:
- (i) first woven, braided, knitted, or filament wound ceramic oxide particles;
- (ii) silicon-containing polymer;
- and
- (iii) organic solvent;
- and
- (B) a non-woven mat of ceramic oxide fiber saturated with a second composition, said second composition comprising:
- (i) silicon-containing polymer;
- and
- (ii) organic solvent, said saturated non-woven mat and saturated braided ceramic oxide fabric each having juxtaposed major surfaces;
- (b) at least partially drying said first and second compositions;
- (c) curing said first and second compositions;
- and
- (d) firing said cured first and second compositions
- to provide a filter material comprising a self supporting fluid permeable wall and a fluid permeable filter layer on said wall, said filter layer being less permeable than said fluid permeable wall, and said filter layer being arranged such that said filter material is permeable.
13 more elements
Dependencies are inferred from the claim text.