US4314852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon carbide fiber reinforced glass composites
Assignee: RTX Corp
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Filing: 1980-05-07
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Granted: 1982-02-09
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Expires: 2000-05-07
Abstract
Abstract Silicon carbide fiber reinforced glass composites are disclosed having high strength, fracture toughness, and oxidative stability, even in high temperature use environments. Disclosed composites include silicon carbide fiber reinforced borosilicate glass, high silica content glass, and aluminosilicate glass. Flexural strengths in excess of 40,000 psi up to temperatures as high as 1150° C. are attained with such composites.
Inventors
- 👤 John J. Brennan
- 👤 Karl M. Prewo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:09
CPC Classifications
C; C03; C03C; C03C14/00; C03C14/002; C03C2214/00; C03C2214/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
A silicon carbide fiber reinforced glass composite consisting essentially of about 30% to about 70% by volume silicon carbide fibers in a glass matrix selected from the group consisting of borosilicate glass, high silica content glass, aluminosilicate glass and mixtures thereof, the composite having a fracture toughness exemplified by a critical stress intensity factor above about 15,000 psi (inch) 1/2 .
Claim 2
Dependent Claim
61 words
A silicon carbide fiber reinforced glass composite consisting essentially of about 30% to about 70% by volume silicon carbide fibers in a glass matrix selected from the group consisting of borosilicate glass, high silica content glass, aluminosilicate glass and mixtures thereof, the composite having a fracture toughness exemplified by a critical stress intensity factor above about 15,000 psi (inch) 1/2 .
Claim 3
Dependent Claim
21 words
The composite of claim 1 having a flexural strength above about 60,000 psi up to a temperature of about 600° C.
Claim 4
Dependent Claim
16 words
The composite of claim 1 wherein the fibers have a substantially 0° orientation within the composite.
Claim 5
Dependent Claim
16 words
The composite of claim 1 wherein the fibers have a substantially 0°/90° orientation within the composite.
Claim 6
Dependent Claim
19 words
The composite of claim 1 wherein the silicon carbide fiber is present in an amount about 50% by volume.
Claim 7
Dependent Claim
30 words
The composite of claim 1 wherein the glass matrix is aluminosilicate glass and the composite has a flexural strength above about 150,000 psi at temperatures up to about 700° C.
Claim 8
Dependent Claim
16 words
The composite of claim 1 having a fracture toughness above about 25,000 psi (inch) 1/2 .
Claim 9
Dependent Claim
30 words
The composite of claim 1 wherein the glass matrix is borosilicate glass and the composite has a flexural strength above about 40,000 psi at temperatures up to about 600° C.
Claim 10
Dependent Claim
32 words
The composite of claim 1 wherein the glass matrix is high silica content glass and the composite has a flexural strength above about 60,000 psi at temperatures up to about 1150° C.
Claim 11
Dependent Claim
30 words
The composite of claim 1 wherein the glass matrix is aluminosilicate glass and the composite has a flexural strength above about 75,000 psi at temperatures up to about 700° C.
References Cited (Backward Citations)
US3161473A
Cited
US3386840A
Cited
US3653851A
Cited
US3509072A
Cited
US3892583A
Cited
US4158687A
Cited
US4060424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |