Patent US4800180A successfully refreshed from Google Patents.
US4800180A
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US
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Ceramic articles containing silicon carbide
Assignee: 3M Co
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Filing: 1986-09-26
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Granted: 1989-01-24
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Expires: 2006-09-26
Abstract
Abstract A shaped article is described comprising a ceramic matrix and dispersed therein in the range of 5 to 30 weight percent mechanically added silicon carbide, said article having a modulus of elasticity (E) value of at least 10 percent greater than the inherent elastic modulus value of the fully dense host matrix. The articles are useful as high temperature stable reinforcement materials in composites requiring a high modulus of elasticity.
Inventors
- 👤 Jerome W. McAllister
- 👤 Lien-Huong T. Pham
- 👤 Harold G. Sowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:08
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/622; C04B35/62227; C04B35/62231; C04B35/78; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
73 words
A shaped article consisting essentially of a ceramic matrix and dispersed therein 5 to 30 weight percent silicon carbide, said silicon carbide having a primary particle size of less than 0.1 micrometer and a modulus of elasticity (E) value greater than 690 GPa, and said article having a modulus of elasticity (E) value of at least 10 percent greater than the inherent modulus of elasticity (E) value of the fully dense host matrix.
Claim 2
Dependent Claim
73 words
A shaped article consisting essentially of a ceramic matrix and dispersed therein 5 to 30 weight percent silicon carbide, said silicon carbide having a primary particle size of less than 0.1 micrometer and a modulus of elasticity (E) value greater than 690 GPa, and said article having a modulus of elasticity (E) value of at least 10 percent greater than the inherent modulus of elasticity (E) value of the fully dense host matrix.
Claim 3
Dependent Claim
24 words
The shaped article according to claim 1 wherein said ceramic matrix is alumina-silica, alumina chromia, alumina-boria, alumin-boria-silica, alumina-phosphorus oxide. titania, zirconia-silica, or combinations thereof.
Claim 4
Dependent Claim
18 words
The shaped article according to claim 1 wherein said ceramic matrix is alumina-boria-silica in a 3:1:2 mole ratio.
Claim 5
Dependent Claim
18 words
The shaped article according to claim 1 wherein said ceramic matrix is zirconia-silica in a 1:1 mole ratio.
Claim 6
Dependent Claim
20 words
The shaped article according to claim 1 having an average peak to valley surface roughness of less than 0.2 micrometer.
Claim 7
Dependent Claim
34 words
The shaped article according to claim 1 wherein said modulus of elasticity (E) value is at least 25 percent greater than the inherent modulus of elasticity (E) value of the fully dense host matrix.
Claim 8
Dependent Claim
34 words
The shaped article according to claim 2 wherein said modulus of elasticity (E) value is at least 50 percent greater than the inherent modulus of elasticity (E) value of the fully dense host matrix.
Claim 9
Dependent Claim
21 words
The shaped article according to claim 1 wherein said silicon carbide particles have an average diameter of less than 0.03 micrometer.
Claim 10
Dependent Claim
20 words
The shaped article according to claim 1 which is selected from the group consisting of a fiber, flake, and sphere.
Claim 11
Dependent Claim
11 words
The shaped article according to claim 1 which is a bubble.
Claim 12
Dependent Claim
91 words
A shaped article consisting essentially of a ceramic matrix and dispersed therein 5 to 30 weight percent silicon carbide, said silicon carbide having a primary article size of less than 0.1 micrometer and a modulus of elasticity (E) value greater than 690 GPa, and wherein said silicon carbide is derived from a carbothermal process or a radio frequency plasma synthesis process, and said article having a modulus of elasticity (E) value of as least 10 percent greater than the inherent modulus of elasticity (E) value of the fully dense host matrix.
Claim 13
Dependent Claim
91 words
A shaped article consisting essentially of a ceramic matrix and dispersed therein 5 to 30 weight percent silicon carbide, said silicon carbide having a primary article size of less than 0.1 micrometer and a modulus of elasticity (E) value greater than 690 GPa, and wherein said silicon carbide is derived from a carbothermal process or a radio frequency plasma synthesis process, and said article having a modulus of elasticity (E) value of as least 10 percent greater than the inherent modulus of elasticity (E) value of the fully dense host matrix.
Claim 14
Dependent Claim
14 words
The shaped article according to claim 11 wherein said silicon carbide is partially oxidized.
Claim 15
Dependent Claim
13 words
The shaped article according to claim 12 wherein said article is a fiber.
Claim 16
Dependent Claim
19 words
The shaped article according to claim 13 wherein said article is stable up to a temperature of 1300° C.
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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) | 1992-01-24 | 1992-07-25 | 1993-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-24 | 1996-07-25 | 1997-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-24 | 2000-07-25 | 2001-01-24 | $7700.00 | Window Closed / Lapsed |