Patent US5376427A successfully refreshed from Google Patents.
US5376427A
Expired / Lapsed
US
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Ceramic composite containing coated fibrous material
Assignee: General Electric Co
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Filing: 1990-09-04
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Granted: 1994-12-27
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Expires: 2010-09-04
Abstract
Abstract A composite is produced by depositing a slurry of infiltration-promoting material and organic binding material on a layer of boron nitride coated fibrous material forming a tape therewith on drying, firing the tape to burn out organic binding material and infiltrating the resulting porous body with silicon.
Inventors
- 👤 Raj N. Singh
- 👤 Achuta R. Gaddipati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:51
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; C04B35/71; C04B35/78; C04B35/80; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/24124; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249955; Y10T428/249956; Y10T428/249957; Y10T428/249967; Y10T428/24997; Y10T428/249986; Y10T428/249987; Y10T428/24999; Y10T428/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A composite comprised of a matrix and a plurality of layers of coated filaments, each layer being comprised of a plurality of boron nitride coated filaments spaced from each other and substantially parallel to each other, said layers of coated filaments being separated from each other by said matrix, said matrix containing elemental silicon in an amount ranging from a detectable amount to about 50 volume percent, said coated filaments comprising at least about 10% by volume of said composite, said matrix having a thermal expansion coefficient which is lower than that of said coated filaments, said matrix being continuous and interconnecting, said composite having a porosity of less than about 10% by volume.
Claim 2
Dependent Claim
114 words
A composite comprised of a matrix and a plurality of layers of coated filaments, each layer being comprised of a plurality of boron nitride coated filaments spaced from each other and substantially parallel to each other, said layers of coated filaments being separated from each other by said matrix, said matrix containing elemental silicon in an amount ranging from a detectable amount to about 50 volume percent, said coated filaments comprising at least about 10% by volume of said composite, said matrix having a thermal expansion coefficient which is lower than that of said coated filaments, said matrix being continuous and interconnecting, said composite having a porosity of less than about 10% by volume.
Claim 3
Dependent Claim
90 words
A composite having a porosity of less than about 20% by volume, comprising at least about 10% by volume of boron nitride coated fibrous material and a continuous interconnecting ceramic matrix comprising elemental silicon in an amount ranging from a detectable amount to about 50 volume percent and having a thermal expansion coefficient ranging from lower than to about 15% higher than the thermal expansion coefficient of the coated fibrous material, said matrix being in direct contact with more than 70% of the surface area of the coated fibrous material.
Claim 4
Dependent Claim
90 words
A composite having a porosity of less than about 20% by volume, comprising at least about 10% by volume of boron nitride coated fibrous material and a continuous interconnecting ceramic matrix comprising elemental silicon in an amount ranging from a detectable amount to about 50 volume percent and having a thermal expansion coefficient ranging from lower than to about 15% higher than the thermal expansion coefficient of the coated fibrous material, said matrix being in direct contact with more than 70% of the surface area of the coated fibrous material.
Claim 5
Dependent Claim
25 words
The composite according to claim 2, having a form selected from the group consisting of tape, sheet, bent tape, bent sheet and any combination thereof.
Claim 6
Dependent Claim
39 words
The composite according to claim 2, wherein said fibrous material is selected from the group consisting of aluminum oxide, mullite, a carbon-containing material, elemental carbon, a SiC-containing material, silicon carbide, a silicon nitride-containing material, silicon nitride, and mixtures thereof.
Claim 7
Dependent Claim
15 words
The composite according to claim 2, wherein said fibrous material is comprised of elemental carbon.
Claim 8
Dependent Claim
14 words
The composite according to claim 2, wherein said fibrous material is a SiC-containing material.
Claim 9
Dependent Claim
85 words
A composite having a porosity of less than about 20% by volume, comprising at least about 10% by volume of separated boron nitride coated fibers and a continuous interconnecting ceramic matrix comprising elemental silicon in an amount ranging from a detectable amount to about 50 volume percent and having a thermal expansion coefficient ranging from lower than to about 15% higher than that of the coated fibers, said matrix being in direct contact with more than 70% of the surface area of the coated fibers.
Claim 10
Dependent Claim
85 words
A composite having a porosity of less than about 20% by volume, comprising at least about 10% by volume of separated boron nitride coated fibers and a continuous interconnecting ceramic matrix comprising elemental silicon in an amount ranging from a detectable amount to about 50 volume percent and having a thermal expansion coefficient ranging from lower than to about 15% higher than that of the coated fibers, said matrix being in direct contact with more than 70% of the surface area of the coated fibers.
Claim 11
Dependent Claim
46 words
The composite according to claim 7, wherein said coated fibrous material is comprised of a plurality of boron nitride coated continuous filaments, substantially all of said coated filaments in each said layer being spaced from each other and being at least substantially parallel to each other.
Claim 12
Dependent Claim
39 words
The composite according to claim 7, wherein said fibrous material is selected from the group consisting of aluminum oxide, mullite, a carbon-containing material, elemental carbon, a SiC-containing material, silicon carbide, a silicon nitride-containing material, silicon nitride, and mixtures thereof.
Claim 13
Dependent Claim
15 words
The composite according to claim 7, wherein said fibrous material is comprised of elemental carbon.
Claim 14
Dependent Claim
15 words
The composite according to claim 7, wherein said fibrous material is comprised of SiC-containing material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |