US5094901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation resistant ceramic matrix composites
Assignee: Power Systems Composites LLC
•
Filing: 1990-07-19
•
Granted: 1992-03-10
•
Expires: 2010-07-19
Abstract
Abstract Ceramic matrix composites having a boron containing oxygen-scavenging sealant-forming region coextensive with the internal fibers and interface debonding layer and a ceramic matrix material provide superior resistance to oxidation.
Inventors
- 👤 Paul E. Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:39
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/515; C04B35/56; C04B35/565; C04B35/58; C04B35/584; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24942; Y10T428/2495; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/30
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
113 words
An oxidation resistant ceramic matrix composite structure comprising reinforcing fibers selected from the group consisting of carbon fibers and ceramic fibers; an interface debonding layer in intimate contact with said fibers said layer having a thickness of from 0.05 to 2 micrometers with the proviso that if the fibers are ceramic then the layer must be carbon; and oxygen-scavenging sealant-forming region consisting essentially of discontinuous particulate material containing a B 2 O 3 precursor, said region substantially coextensive with said fibers and said interface debonding layer wherein the weight ratio of said oxygen-scavenging sealant-forming region to said fibers plus said interface debonding layer is from 0.05 to 0.7; and a ceramic matrix material.
Claim 2
Dependent Claim
113 words
An oxidation resistant ceramic matrix composite structure comprising reinforcing fibers selected from the group consisting of carbon fibers and ceramic fibers; an interface debonding layer in intimate contact with said fibers said layer having a thickness of from 0.05 to 2 micrometers with the proviso that if the fibers are ceramic then the layer must be carbon; and oxygen-scavenging sealant-forming region consisting essentially of discontinuous particulate material containing a B 2 O 3 precursor, said region substantially coextensive with said fibers and said interface debonding layer wherein the weight ratio of said oxygen-scavenging sealant-forming region to said fibers plus said interface debonding layer is from 0.05 to 0.7; and a ceramic matrix material.
Claim 3
Dependent Claim
22 words
A composite structure of claim 1 wherein the fiber is selected from the group consisting of carbon, silicon nitride and silicon carbide.
Claim 4
Dependent Claim
32 words
A composite structure of claim 1 wherein the interface debonding layer is selected from the group consisting of carbon and boron nitride and has a thickness of from 0.05 to 2 micrometers.
Claim 5
Dependent Claim
32 words
A composite structure of claim 1 wherein the interface debonding layer is selected from the group consisting of carbon and boron nitride and has a thickness of from 0.2 to 1.2 micrometers.
Claim 6
Dependent Claim
17 words
A composite structure of claim 1 wherein the ceramic matrix material is substantially free of boron compounds.
Claim 7
Dependent Claim
16 words
A composite structure of claim 1 wherein the ceramic matrix material is a silicon containing ceramic.
Claim 8
Dependent Claim
16 words
A composite structure of claim 5 wherein the ceramic matrix material is a silicon containing ceramic.
Claim 9
Dependent Claim
11 words
A composite structure of claim 1 having an external refractory coating.
Claim 10
Dependent Claim
20 words
A composite structure of claim 1 having an external refractory coating of the same material as the ceramic matrix material.
Claim 11
Dependent Claim
30 words
A composite structure of claim 1 having an external coating of the same material as the ceramic matrix material separated from the ceramic matrix material by a glass forming layer.
Claim 12
Dependent Claim
26 words
A composite structure of claim 1 wherein the weight ratio of oxygen-scavenging sealant-forming region to the fibers plus the interface layer is from 0.35 to 0.45.
Claim 13
Dependent Claim
30 words
A composite structure of claim 1 wherein the oxygen-scavenging sealant-forming region contains a source of silicon such that the mole ratio of boron to silicon is from 1:1 to 10:1.
Claim 14
Dependent Claim
16 words
A composite structure of claim 12 wherein the source of silicon is a SiO 2 precursor.
Claim 15
Dependent Claim
23 words
A composite structure of claim 4 wherein the ceramic matrix material is substantially free of boron compounds and is a silicon containing ceramic.
Claim 16
Dependent Claim
11 words
A composite structure of claim 4 having an external refractory coating.
Claim 17
Dependent Claim
20 words
A composite structure of claim 4 having an external refractory coating of the same material as the ceramic matrix material.
Claim 18
Dependent Claim
30 words
A composite structure of claim 14 having an external coating of the same material as the ceramic matrix material separated from the ceramic matrix material by a glass forming layer.
Claim 19
Dependent Claim
26 words
A composite structure of claim 4 wherein the weight ratio of oxygen-scavenging sealant-forming region to the fibers plus the interface layer is from 0.35 to 0.45.
Claim 20
Dependent Claim
26 words
A composite structure of claim 17 wherein the weight ratio of oxygen-scavenging sealant-forming region to fibers plus the interface debonding layer is from 0.35 to 0.45.
Claim 21
Dependent Claim
30 words
A composite structure of claim 4 wherein the oxygen-scavenging sealant-forming region contains a SiO 2 precursor such that the mole ratio of boron to silicon is from 1:1 to 10:1.
Claim 22
Dependent Claim
17 words
A composite structure of claim 20 wherein the ceramic matrix material is substantially free of boron compounds.
Claim 23
Dependent Claim
33 words
A composite structure of claim 21 the composite structure has an external coating of the same material as the ceramic matrix material separated from the ceramic matrix material by a glass forming layer.
Claim 24
Dependent Claim
27 words
A composite structure of claim 22 wherein the weight ratio of oxygen-scavenging sealant-forming region to the fibers plus the interface debonding layer is from 0.35 to 0.45.
Claim 25
Dependent Claim
29 words
A composite structure of any one of claims 1 to 25 wherein the fiber is selected from the group consisting of carbon, SiC, and Si 3 N 4 .
Claim 26
Dependent Claim
30 words
A composite structure of any one of claims 1 to 25 wherein the ceramic matrix material is selected from the group consisting of SiC and Si 3 N 4 .
Claim 27
Dependent Claim
27 words
A composite structure of any one of claims 1 to 25 wherein the interface debonding layer is selected from the group consisting of carbon and boron nitride.
Claim 28
Dependent Claim
34 words
A composite structure of any one of claims 1 to 25 wherein the oxygen-scavenging sealant-forming region comprises a member selected from the group consisting of boron, B 4 C, SiB 6 and boron nitride.
Claim 29
Dependent Claim
59 words
A composite structure of any one of claims 1 to 25 wherein the fiber is selected from the group consisting of carbon and SiC, the ceramic matrix material is SiC, the interface debonding layer is carbon and the oxygen-scavenging sealant-forming region comprises a member selected from the group consisting of boron, B 4 C, SiB 6 and boron nitride.
Claim 30
Dependent Claim
66 words
A composite structure of any one of claims 1 to 25 wherein the fiber is selected from the group of carbon and Si 3 N 4 , the ceramic matrix material is Si 3 N 4 , the interface debonding layer is carbon and the oxygen-scavenging sealant-forming region comprises a member selected from the group consisting of boron, B 4 C, SiB 6 and boron nitride.
Claim 31
Dependent Claim
51 words
A composite structure of any one of claims 1 to 25 wherein the fiber is carbon, the ceramic matrix material is SiC, the interface debonding layer is carbon and the oxygen-scavenging sealant-forming region comprises a member selected from the group consisting of boron, B 4 C, SiB 6 and boron nitride.
References Cited (Backward Citations)
US3991248A
Cited
US3895084A
Cited
US4275095A
Cited
US4397901A
Cited
US4442165A
Cited
US4429003A
Cited
US4515860A
Cited
US4599256A
Cited
US4613522A
Cited
US4766013A
Cited
US4668579A
Cited
US4752503A
Cited
US4515847A
Cited
US4582751A
Cited
US4892790A
Cited
US4795677A
Cited
US4869943A
Cited
US4642271A
Cited
US4948662A
Cited
US4605588A
Cited
US4735850A
Cited
US4761323A
Cited
US4885199A
Cited
US4863773A
Cited
US4944904A
Cited
US4902563A
Cited
US4863798A
Cited
US4894286A
Cited
US4873353A
Cited
US4889686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |