US5067998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous material-containing composite
Assignee: General Electric Co
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Filing: 1989-12-11
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Granted: 1991-11-26
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Expires: 2009-12-11
Abstract
Abstract A composite is produced by admixing a matrix-forming material with organic binding material, forming the resulting mixture into a tape, disposing a layer of boron nitride coated fibrous material between at least two of the tapes to form a layered structure, laminating the layered structure, heating the layered structure to remove organic binding material and hot pressing the resulting porous structure to form a composite.
Inventors
- 👤 Raj N. Singh
- 👤 Achuta R. Gaddipati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:12
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; B; B32; B32B; B32B18/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/16; C04B35/18; C04B35/185; C04B35/48; C04B35/481; C04B35/515; C04B35/56; C04B35/565; C04B35/58; C04B35/584; C04B35/622; C04B35/626; C04B35/62605; C04B35/62625; C04B35/6263; C04B35/6264; C04B35/628; C04B35/62844; C04B35/62857; C04B35/62865; C04B35/62868; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/6342; C04B35/638; C04B35/64; C04B35/645; C04B37/00; C04B37/008; C04B2235/00; C04B2235/02; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5224; C04B2235/524; C04B2235/5244; C04B2235/5248; C04B2235/5276; C04B2235/60; C04B2235/604; C04B2235/612; C04B2235/65; C04B2235/656; C04B2235/6562; C04B2235/6565; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/78; C04B2235/786; C04B2235/96; C04B2235/9607; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/345; C04B2237/348; C04B2237/38; C04B2237/50; C04B2237/70; C04B2237/704; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/24124; Y10T428/24132; Y10T428/249921; Y10T428/249924; Y10T428/249928; Y10T428/249929
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
133 words
A process for making a composite containing boron nitride coated fibrous material embedded in a ceramic matrix which comprises the following steps: (a) forming a laminated structure comprising at least one layer of boron nitride coated fibrous material disposed between two layers of tape comprising a ceramic matrix material said matrix having a thermal expansion coefficient which is less than about 15% higher than that of the coated fibrous material, and an organic binder material; (b) heating the laminated structure to remove the organic binding material; and (c) hot pressing the resulting laminated structure at a temperature and pressure to consolidate said structure to produce a composite having a porosity of less than about 5% by volume, at least about 10% by volume of said composite being said boron nitride coated fibrous material.
Claim 2
Dependent Claim
133 words
A process for making a composite containing boron nitride coated fibrous material embedded in a ceramic matrix which comprises the following steps: (a) forming a laminated structure comprising at least one layer of boron nitride coated fibrous material disposed between two layers of tape comprising a ceramic matrix material said matrix having a thermal expansion coefficient which is less than about 15% higher than that of the coated fibrous material, and an organic binder material; (b) heating the laminated structure to remove the organic binding material; and (c) hot pressing the resulting laminated structure at a temperature and pressure to consolidate said structure to produce a composite having a porosity of less than about 5% by volume, at least about 10% by volume of said composite being said boron nitride coated fibrous material.
Claim 3
Dependent Claim
27 words
The process according to claim 1, wherein said fibrous material is selected from the group consisting of fibers, filaments, strands, bundles, whiskers, cloth, felt, and combinations thereof.
Claim 4
Dependent Claim
25 words
The process according to claim 1, wherein in step (e) said layer of coated fibrous material is comprised of a plurality of spaced continuous filaments.
Claim 5
Dependent Claim
13 words
The process according to claim 1, wherein said fibrous material is elemental carbon.
Claim 6
Dependent Claim
86 words
The process according to claim 1, wherein said fibrous material is selected from the group consisting of aluminum oxide, elemental carbon, a silicon carbide-containing material containing at least about 50% by weight of silicon and at least about 25% by weight of carbon based on the weight of said silicon carbide-containing material, a silicon nitride-containing material containing at least about 50% by weight of silicon and at least about 25% by weight of nitrogen based on the weight of said silicon nitride-containing material, and combinations thereof.
Claim 7
Dependent Claim
16 words
The process according to claim 1, wherein said matrix-forming material is comprised of an oxide-based ceramic.
Claim 8
Dependent Claim
31 words
The process according to claim 1, wherein said matrix-forming material is comprised of particulates selected from the group consisting of aluminum oxide, mullite, zircon, silicon carbide, silicon nitride, and combinations thereof.
Claim 9
Dependent Claim
32 words
The process according to claim 1, wherein said matrix-forming material is comprised of crystalline ceramic particulates and whiskers wherein said whiskers range up to about 30% by volume of said matrix-forming material.
Claim 10
Dependent Claim
35 words
The process according to claim 1, wherein said matrix has a thermal expansion coefficient ranging from lower than that of said coated fibrous material to about the same as that of said coated fibrous material.
Claim 11
Dependent Claim
152 words
A process for making a composite containing a plurality of spaced layers of boron nitride coated fibrous material embedded in a ceramic matrix which comprises the following steps: (a) forming a layered strucutre comprising a plurality of layers of boron nitride coated fibrous material and a plurality of tapes comprising a ceramic matrix material and an organic binder material wherein each layer of coated fibrous material is disposed between the faces of said tapes; (b) heating the laminated structure to remove the organic binding material; and (c) hot pressing the resulting laminated structure at a temperature and pressure to consolidate said structure to produce a composite having a porosity of less than about 5% by volume, the matrix having a thermal expansion coefficient which is less than about 15% higher than that of the coated fibrous material, at least about 10% by volume of said composite being boron nitride coated fibrous material.
Claim 12
Dependent Claim
152 words
A process for making a composite containing a plurality of spaced layers of boron nitride coated fibrous material embedded in a ceramic matrix which comprises the following steps: (a) forming a layered strucutre comprising a plurality of layers of boron nitride coated fibrous material and a plurality of tapes comprising a ceramic matrix material and an organic binder material wherein each layer of coated fibrous material is disposed between the faces of said tapes; (b) heating the laminated structure to remove the organic binding material; and (c) hot pressing the resulting laminated structure at a temperature and pressure to consolidate said structure to produce a composite having a porosity of less than about 5% by volume, the matrix having a thermal expansion coefficient which is less than about 15% higher than that of the coated fibrous material, at least about 10% by volume of said composite being boron nitride coated fibrous material.
Claim 13
Dependent Claim
27 words
The process according to claim 10, wherein said fibrous material is selected from the group consisting of fibers, filaments, strands, bundles, whiskers, cloth, felt, and combinations thereof.
Claim 14
Dependent Claim
25 words
The process according to claim 10, wherein in step (e) said layers of coated fibrous material are comprised of a plurality of spaced continuous filaments.
Claim 15
Dependent Claim
21 words
The process according to claim 10, wherein said fibrous material is comprised of a combination of elemental carbon and silicon carbide.
Claim 16
Dependent Claim
86 words
The process according to claim 10, wherein said fibrous material is selected from the group consisting of aluminum oxide, elemental carbon, a silicon carbidecontaining material containing at least about 50% by weight of silicon and at least about 25% by weight of carbon based on the weight of said silicon carbide-containing material, a silicon nitride-containing material containing at least about 50% by weight of silicon and at least about 25% by weight of nitrogen based on the weight of said silicon nitride-containing material, and combinations thereof.
Claim 17
Dependent Claim
14 words
The process according to claim 10, wherein said fibrous material is a carbon-containing material.
Claim 18
Dependent Claim
16 words
The process according to claim 10, wherein said matrix-forming material is comprised of an oxide-based ceramic.
Claim 19
Dependent Claim
31 words
The process according to claim 10, wherein said matrix-forming material is comprised of particulates selected from the group consisting of aluminum oxide, mullite, zircon, silicon carbide, silicon nitride, and combinations thereof.
Claim 20
Dependent Claim
32 words
The process according to claim 10, wherein said matrix-forming material is comprised of crystalline ceramic particulates and whiskers wherein said whiskers range up to about 30% by volume of said matrix-forming material.
Claim 21
Dependent Claim
35 words
The process according to claim 10 wherein said matrix has a thermal expansion coefficient ranging from lower than that of said coated fibrous material to about the same as that of said coated fibrous 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) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |