US4828774A
Expired / Lapsed
US
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Porous ceramic bodies
Assignee: United States Department of the Air Force
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Filing: 1987-02-05
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Granted: 1989-05-09
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Expires: 2007-02-05
Abstract
Abstract A porous body consisting of a felted fibrous skeleton covered with and bonded together by a ceramic material is provided. Also provided are methods for making such a porous body which comprise the use of ceramic polymer solutions.
Inventors
- 👤 Clarence A. Andersson
- 👤 Deborah P. Partlow
- 👤 Bulent E. Yoldas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B14/00; C04B14/38; C04B14/46; C04B30/00; C04B30/02; C04B35/01; C04B35/14; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956; Y10T428/249957; Y10T428/249962; Y10T428/249964; Y10T428/249967; Y10T428/24997; Y10T428/30
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
89 words
A method for making a porous body consisting of a felted fibrous skeleton covered with and bonded together by a ceramic material which comprises the steps of: (a) providing a first ceramic polymer solution; (b) blending high strength fibers with said solution to provide a mixture; (c) felting said mixture; (d) drying the resulting felt; and (e) firing the dried felt; wherein said ceramic polymer solution is an alcoholic solution containing an inorganic oxide network of at least one glass-forming element formed by controlled hydrolysis of an organo-metallic compound.
Claim 2
Independent Claim
89 words
A method for making a porous body consisting of a felted fibrous skeleton covered with and bonded together by a ceramic material which comprises the steps of: (a) providing a first ceramic polymer solution; (b) blending high strength fibers with said solution to provide a mixture; (c) felting said mixture; (d) drying the resulting felt; and (e) firing the dried felt; wherein said ceramic polymer solution is an alcoholic solution containing an inorganic oxide network of at least one glass-forming element formed by controlled hydrolysis of an organo-metallic compound.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said polymer solution has an equivalent oxide concentration between about 1.0 percent and the concentration of gellation.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein said polymer solution contains about 10.0 weight percent equivalent silicon dioxide.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein said mixture contains about 0.25 to 2.5 g of said fibers per 100 g of said solution.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein said felting step comprises vacuum filtration of said mixture.
Claim 7
Dependent Claim
26 words
The method of claim 5 wherein said mixture is vacuum filtered using an apparatus having a configuration complementary to the desired shape of the felted material.
Claim 8
Dependent Claim
51 words
The method of claim 1 further comprising the steps of: (f) impregnating the resulting fired body with a second ceramic polymer solution; (g) drying the resulting impregnated body; (h) firing the dried body; and (i) repeating steps (f) to and including (h) to provide a porous body having a desired density.
Claim 9
Dependent Claim
21 words
The method of claim 7 wherein said polymer solution has an equivalent oxide concentration of about one-half of said first solution.
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein said glass-forming element is selected from the group consisting of Si, Al, Ti and Zr.
Claim 11
Dependent Claim
16 words
The method of claim 9 wherein said ceramic polymer solution is modified with Mg or B.
Claim 12
Independent Claim
91 words
A method for making a porous body consisting of a felted fibrous skeleton covered with and bonded together by a ceramic material which comprises the steps of: (a) felting a plurality of high-strength fibers; (b) providing a ceramic polymer solution; (c) impregnating the felt resulting from step (a) with said solution; (d) drying the resulting impregnated felt; and (e) firing the dried felt; wherein said ceramic polymer solution is an alcoholic solution containing an inorganic oxide network of at least one glass-forming element formed by controlled hydrolysis of an organo-metallic compound.
Claim 13
Independent Claim
91 words
A method for making a porous body consisting of a felted fibrous skeleton covered with and bonded together by a ceramic material which comprises the steps of: (a) felting a plurality of high-strength fibers; (b) providing a ceramic polymer solution; (c) impregnating the felt resulting from step (a) with said solution; (d) drying the resulting impregnated felt; and (e) firing the dried felt; wherein said ceramic polymer solution is an alcoholic solution containing an inorganic oxide network of at least one glass-forming element formed by controlled hydrolysis of an organo-metallic compound.
Claim 14
Dependent Claim
23 words
The method of claim 11 wherein said polymer solution has an equivalent oxide concentration between about 1.0 percent and the concentration of gellation.
Claim 15
Dependent Claim
14 words
The method of claim 12 wherein said polymer solution contains about 5.0 equivalent oxide.
Claim 16
Dependent Claim
36 words
The method of claim 13 wherein said fibers are selected from the group consisting of carbon, graphite, silica, silicon carbide, silicon nitride, silicon carbide-coated boron, boron carbide-coated boron, silicon-coated silicon carbide, alumina, Be-Ti composites and boron-aluminosilicate.
Claim 17
Dependent Claim
47 words
The method of claim 11 further comprising the steps of: (f) impregnating the resulting fired body with said polymer solution; (g) drying the resulting impregnated body; (h) firing the dried body; and (i) repeating steps (f) through (h) to provide a porous body having an desired density.
Claim 18
Dependent Claim
21 words
The method of claim 11 wherein said glass-forming element is selected from the group consisting of Si, Al, Ti and Zr.
Claim 19
Dependent Claim
16 words
The method of claim 16 wherein said ceramic polymer solution is modified with Mg or B.
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| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
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