EP0126017A1
Expired / Lapsed
EP
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High strength, thermally stable magnesium aluminosilicate glass-ceramic matrix-silicon carbide fibre composites
Assignee: RTX Corp
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Filing: 1984-03-16
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Granted: —
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Expires: 2004-03-16
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
EP
Data Source
google_patents
Last Synchronized
2026-11-03 15:10
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: 6
Claim 1
Independent Claim
53 words
A silicon carbide fiber reinforced glass-ceramic composite comprising silicon carbide fibers implanted within a glass-ceramic matrix consisting essentially of magnesium aluminosilicate containing by weight about 5% to about 15% magnesium oxide, and about 5% to about 25% barium oxide, the composite having high strength and thermal stability at temperatures in excess of 1200°C.
Claim 2
Dependent Claim
53 words
A silicon carbide fiber reinforced glass-ceramic composite comprising silicon carbide fibers implanted within a glass-ceramic matrix consisting essentially of magnesium aluminosilicate containing by weight about 5% to about 15% magnesium oxide, and about 5% to about 25% barium oxide, the composite having high strength and thermal stability at temperatures in excess of 1200°C.
Claim 3
Dependent Claim
13 words
The composite of claim 1 wherein the glass-ceramic matrix is constituted as follows:
Claim 4
Dependent Claim
53 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% Si0 2 , about 14.1% BaO, and about 0.7% As 2 O 3 , and when fully crystallized is predominantly barium osumilite (BaMg 2 Al 6 Si 9 O 30 ).
Claim 5
Independent Claim
89 words
A method of forming silicon carbide fiber reinforced glass-ceramic matrix composites comprising hot pressing a mixture of silicon carbide fibers in a glass-ceramic matrix consisting essentially of magnesium aluminosilicate containing by weight about 5% to about 15% magnesium oxide, and about 5% to about 25% barium oxide, at about 1200°C to about 1500°C, followed by heating the hot pressed composite at about 1100°C to about 1200°C to substantially completely form the ceramic phase, resulting in a composite with high strength and thermal stability at temperatures in excess of 1200°C.
Claim 6
Independent Claim
89 words
A method of forming silicon carbide fiber reinforced glass-ceramic matrix composites comprising hot pressing a mixture of silicon carbide fibers in a glass-ceramic matrix consisting essentially of magnesium aluminosilicate containing by weight about 5% to about 15% magnesium oxide, and about 5% to about 25% barium oxide, at about 1200°C to about 1500°C, followed by heating the hot pressed composite at about 1100°C to about 1200°C to substantially completely form the ceramic phase, resulting in a composite with high strength and thermal stability at temperatures in excess of 1200°C.
References Cited (Backward Citations)
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