US4764488A
Expired / Lapsed
US
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High toughness ceramic composites consisting of ceramic body reinforced with metal fiber
Assignee: Kobe Steel Ltd
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Filing: 1986-09-24
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Granted: 1988-08-16
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Expires: 2006-09-24
Abstract
Abstract Described herein is a high toughness ceramic composite of the fiber reinforced type, comprising: metal fiber integrally anchored in a ceramic matrix and having a shape of triangular waves forming bent portions alternately on the opposite sides thereof with an angle θ of the bent portions in a range between 60° and 165°, a ratio of d/H (a ratio of the amplitude H of the waves to the diameter d of the fiber) in a range between 0.025 and 0.6, and a ratio of ρ/d (a ratio of the radius of curvature ρ at the apex of the bent portion to the fiber diameter d) greater than 1, inclusive.
Inventors
- 👤 Makoto Saito
- 👤 Takao Mizoguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:58
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/74; C04B35/76; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
A high toughness ceramic composite of the fiber reinforced type, comprising: metal fiber integrally and substantially undirectionally anchored in a ceramic matrix and having a shape of triangular waves forming bent portions alternately on the opposite sides thereof with an angle θ of said bent portions in a range between 60° and 165°, a ratio of d/H (a ratio of the amplitude H of said waves to the diameter d of said fiber) in a range between 0.025 and 0.6, and a ratio of ρ/d (a ratio of the radius of curvature ρ at the apex of said bent portion to the fiber diameter d) greater than 1, inclusive.
Claim 2
Dependent Claim
109 words
A high toughness ceramic composite of the fiber reinforced type, comprising: metal fiber integrally and substantially undirectionally anchored in a ceramic matrix and having a shape of triangular waves forming bent portions alternately on the opposite sides thereof with an angle θ of said bent portions in a range between 60° and 165°, a ratio of d/H (a ratio of the amplitude H of said waves to the diameter d of said fiber) in a range between 0.025 and 0.6, and a ratio of ρ/d (a ratio of the radius of curvature ρ at the apex of said bent portion to the fiber diameter d) greater than 1, inclusive.
Claim 3
Dependent Claim
20 words
The high toughness ceramic composite of claim 1, wherein said angle θ is in a range between 75° and 150°.
Claim 4
Dependent Claim
21 words
The high toughness ceramic composite of claim 2, wherein the ratio of d/H is in a range between 0.05 and 0.4.
Claim 5
Dependent Claim
26 words
The high toughness ceramic composite of any one of claims 1 to 3, wherein the ratio of ρ/d is in a range between 1.5 and 3.
Claim 6
Dependent Claim
21 words
The high toughness ceramic composite of claim 2, wherein said open angle θ is in a range between 90° and 135°.
Claim 7
Dependent Claim
21 words
The high toughness ceramic composite of claim 3, wherein said ratio of d/H is in a range between 0.1 and 0.3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |