US4588699A
Expired / Lapsed
US
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High strength, thermally stable magnesium aluminosilicate glass-ceramic matrix-sic fiber composites
Assignee: RTX Corp
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Filing: 1983-03-17
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Granted: 1986-05-13
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Expires: 2003-03-17
Abstract
Abstract A silicon carbide fiber reinforced barium modified magnesium aluminosilicate matrix composite is described having high strength and thermal stability at temperature 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 08:39
CPC Classifications
C; C03; C03C; C03C14/00; C03C14/002; C03C10/00; C03C10/0036; C03C10/0045; C03C2214/00; C03C2214/02; C03C2214/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
A silicon carbide fiber reinforced glass-ceramic composite consisting essentially of about 15% to about 70% by volume of silicon carbide fibers implanted within a glass-ceramic matrix consisting essentially of: MgO--5-15%, As 2 O 3 --0.5-3%, Al 2 O 3 --20-40%, Nb 2 O 5 --0-10%, SiO 2 --40-60%, Ta 2 O 5 --0-10%, BaO--5-15%, and when fully crystallized is predominantly barium osumilite, the composite having high strength and thermal stability at temperatures in excess of 1200° C.
Claim 2
Dependent Claim
77 words
A silicon carbide fiber reinforced glass-ceramic composite consisting essentially of about 15% to about 70% by volume of silicon carbide fibers implanted within a glass-ceramic matrix consisting essentially of: MgO--5-15%, As 2 O 3 --0.5-3%, Al 2 O 3 --20-40%, Nb 2 O 5 --0-10%, SiO 2 --40-60%, Ta 2 O 5 --0-10%, BaO--5-15%, and when fully crystallized is predominantly barium osumilite, the composite having high strength and thermal stability at temperatures in excess of 1200° C.
Claim 3
Dependent Claim
36 words
The composite of claim 1 wherein the magnesium aluminosilicate contains 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 .
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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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |