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US 4,857,485 AGranted
Oxidation resistant fiber reinforced composite article
AssigneeUnited Technologies Corporation
InventorsJohn J. Brennan, George K. Layden, Karl M. Prewo
Life of this patent
Estimating the term…
Abstract
A silicon carbide fiber reinforced glass-ceramic matrix composite article is disclosed. The matrix is a lithium alumino silicate glass-ceramic composition which may include from 1 to 5 weight percent B.sub.2 O.sub.3. The fiber reinforced glass-ceramic matrix composite article exhibits both high flexural strength at elevated temperatures and oxidative stability at elevated temperatures in an oxidizing environment.
Claims2
A fiber reinforced composite article, comprising:
- from about 20 volume percent to about 60 volume percent silicon carbide fibers, and
- from about 40 volume percent to about 80 volume percent glass-ceramic matrix,
- said glass-ceramic matrix having
- from about 60 weight percent to about 75 weight percent SiO.sub.2,
- from about 15 weight percent to about 25 weight percent Al.sub.2 O.sub.3,
- from about 1.5 weight percent to about 5 weight percent Li.sub.2 O,
- from about 1 weight percent to about 5 weight percent MgO,
- up to about 3 weight percent ZnO.sub.2,
- up to about 3 weight percent As.sub.2 O.sub.3, and
- from about 2 weight percent to about 5 weight percent B.sub.2 O.sub.3
- said composite article exhibiting both high flexural strength at temperatures of up to about 1000.degree. C. and oxidative stability at temperatures above about 450.degree. C. in an oxidizing environment.
8 more elements
A fiber reinforced composite article, comprising:
- from about 20 volume percent to about 60 volume percent silicon carbide fibers, and
- from about 40 volume percent to about 80 volume percent glass-ceramic matrix,
- said glass-ceramic matrix comprising
- from about 60 weight percent to about 75 weight percent SiO.sub.2,
- from about 15 weight percent to about 25 weight percent Al.sub.2 O.sub.3,
- from about 1.5 weight percent to about 5 weight percent Li.sub.2 O,
- from about 1 weight percent to about 5 weight percent MgO,
- from about 1 weight percent to about 3 weight percent ZrO.sub.2,
- from about 0.4 weight percent to about 2 weight percent Na.sub.2 O,
- from about 0.05 weight percent to about 0.5 weight percent K.sub.2 O,
- from about 0.5 weight percent to about 3 weight percent As.sub.2 O.sub.3,
- up to about 2 weight percent ZnO,
- up to about 2 weight percent BaO,
- up to about 1 weight percent Nd.sub.2 O.sub.3, and
- from about 1 weight percent to about 5 weight percent B.sub.2 O.sub.3
- where the combined amount of ZnO, BaO, Na.sub.2 O, K.sub.2 O and As.sub.2 O.sub.3 is between about 0.2 weight percent and about 3 weight percent, and said composite article exhibits both high flexural strength at temperatures of up to about 1000.degree. C. and oxidative stability at temperatures of above about 450.degree. C. in an oxidizing environment.
13 more elements
Dependencies are inferred from the claim text.