US4589900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength thermally stable magnesium aluminosilicate glass-ceramic matrix sic fiber composite
Assignee: RTX Corp
•
Filing: 1985-09-27
•
Granted: 1986-05-20
•
Expires: 2005-09-27
Abstract
Abstract A silicon carbide fiber reinforced barium modified magnesium aluminosilicate matrix composite is described having high strength and thermal stability at temperatures in excess of 1200° C. The matrix material contains about 5% to about 14% magnesium oxide and about 5% to about 25% barium oxide. While any suitable ratios of fiber to matrix can be used, the composite for most applications for example, in the heat engine area, will contain approximately 20% to 50% by volume silicon carbide fibers.
Inventors
- 👤 John J. Brennan
- 👤 Kenneth Chyung
- 👤 Mark P. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:12
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036; C03C10/0045; C03C14/00; C03C14/002; C03C2214/00; C03C2214/02; C03C2214/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
A method of forming silicon carbide fiber reinforced glass-ceramic matrix composites comprising hot pressing a mixture of about 15% to about 70% by volume of silicon carbide fibers in a glass powder matrix consisting essentially of: ______________________________________
MgO 5-15% As.sub.2 O.sub.3
0.5-3%
Al.sub.2 O.sub.3
20-40% Nb.sub.2 O.sub.5
0-10%
SiO.sub.2
40-60% Ta.sub.2 O.sub.5
0-10%
BaO 5-15%
______________________________________ at about 1200° C. to about 1500° C., followed by heating the hot pressed composite at about 1100° C. to about 1200° C. for about 24 hours to about 60 hours resulting in a composite with high strength and thermal stability at temperatures in excess of 1200° C.
Claim 2
Independent Claim
104 words
A method of forming silicon carbide fiber reinforced glass-ceramic matrix composites comprising hot pressing a mixture of about 15% to about 70% by volume of silicon carbide fibers in a glass powder matrix consisting essentially of: ______________________________________
MgO 5-15% As.sub.2 O.sub.3
0.5-3%
Al.sub.2 O.sub.3
20-40% Nb.sub.2 O.sub.5
0-10%
SiO.sub.2
40-60% Ta.sub.2 O.sub.5
0-10%
BaO 5-15%
______________________________________ at about 1200° C. to about 1500° C., followed by heating the hot pressed composite at about 1100° C. to about 1200° C. for about 24 hours to about 60 hours resulting in a composite with high strength and thermal stability at temperatures in excess of 1200° C.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein the glass powder matrix consists essentially of about 7.4% MgO, about 28.1% Al 2 O 3 , about 49.7% SiO 2 , about 14.1% BaO, and about 0.7% As 2 O 3 .
References Cited (Backward Citations)
US3480452A
Cited
GB1459178A
Cited
GB1535202A
Cited
US4324843A
Cited
US4314852A
Cited
US4410635A
Cited
US4415672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |