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US4883779A
Expired / Lapsed
US
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Ceramic articles containing silicon carbide
Assignee: 3M Co
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Filing: 1988-10-20
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Granted: 1989-11-28
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Expires: 2008-10-20
Abstract
Abstract A shaped article comprises 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
2026-11-06 15:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/71; C04B35/78
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
123 words
A method for preparing a ceramic shaped article having a ceramic matrix and dipersed therein silicon carbide, the method comprising the steps of: (a) preparing a mixture of viscous precursor liquids comprising at least one ceramic precursor sol and crystalline silicon carbide particles have an average diameter of at most 0.1 micrometer, (b) shaping said viscous concentrate into a shaped form, (c) means for providing a green shaped article from said shaped form, (d) heating and firing the green shaped article to remove moisture and fugitive constituents and provide a refractory shaped article, wherein said article has 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
Independent Claim
123 words
A method for preparing a ceramic shaped article having a ceramic matrix and dipersed therein silicon carbide, the method comprising the steps of: (a) preparing a mixture of viscous precursor liquids comprising at least one ceramic precursor sol and crystalline silicon carbide particles have an average diameter of at most 0.1 micrometer, (b) shaping said viscous concentrate into a shaped form, (c) means for providing a green shaped article from said shaped form, (d) heating and firing the green shaped article to remove moisture and fugitive constituents and provide a refractory shaped article, wherein said article has 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
22 words
The method according to claim 1 wherein said shaped article comprises in the range of 5 to 30 weight percent silicon carbide.
Claim 4
Dependent Claim
22 words
The method according to claim 1 wherein said ceramic matrix is alumina-silica, alumina-chromia, alumina-boria, alumina-boria-silica, alumina-phosphorus oxide, titania, zirconia-silica, or combinations thereof.
Claim 5
Dependent Claim
12 words
The method according to claim 1 wherein said SiC is partially oxidized.
Claim 6
Dependent Claim
27 words
The method according to claim 1 wherein said modulus of elasticity (E) value is at least 25 percent greater than that of the fully dense host matrix.
Claim 7
Dependent Claim
21 words
The method according to claim 1 wherein said green shaped article is provided by removing sufficient volatile solvent to cause gellation.
Claim 8
Dependent Claim
18 words
The method according to claim 1 wherein said green shaped article is provided by hydrolyzing said shaped form.
Claim 9
Independent Claim
134 words
A method for preparing a ceramic shaped article having a ceramic matrix and dispersed therein silicon carbide, the method comprising the steps of: (a) preparing a mixture of viscous precursor liquids comprising at least one ceramic precursor sol and crystalline silicon carbide particles have an average diameter of at most 0.1 micrometer and a modulus of elasticity (E) value greater than 690 GPa, (b) shaping said viscous concentrate into a shaped form, (c) means for providing a green shaped article from said shaped form, (d) heating and firing the green shaped article to remove moisture and fugitive constituents and provide a refractory shaped article, wherein said article has 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 10
Independent Claim
134 words
A method for preparing a ceramic shaped article having a ceramic matrix and dispersed therein silicon carbide, the method comprising the steps of: (a) preparing a mixture of viscous precursor liquids comprising at least one ceramic precursor sol and crystalline silicon carbide particles have an average diameter of at most 0.1 micrometer and a modulus of elasticity (E) value greater than 690 GPa, (b) shaping said viscous concentrate into a shaped form, (c) means for providing a green shaped article from said shaped form, (d) heating and firing the green shaped article to remove moisture and fugitive constituents and provide a refractory shaped article, wherein said article has 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 11
Dependent Claim
22 words
The method according to claim 8 wherein said shaped article comprises in the range of 5 to 30 weight percent silicon carbide.
Claim 12
Dependent Claim
22 words
The method according to claim 8 wherein said ceramic matrix is alumina-silica, alumina-chromia, alumina-boria, alumina-boria-silica, alumina-phosphorus oxide, titania, zirconia-silica, or combinations thereof.
Claim 13
Dependent Claim
12 words
The method according to claim 8 wherein said SiC is partially oxidized.
Claim 14
Dependent Claim
27 words
The method according to claim 8 wherein said modulus of elasticity (E) value is at least 25 percent greater than that of the fully dense host matrix.
Claim 15
Dependent Claim
21 words
The method according to claim 8 wherein said green shaped article is provided by removing sufficient volatile solvent to cause gellation.
Claim 16
Dependent Claim
18 words
The method according to claim 8 wherein said green shaped article is provided by hydrolyzing said shaped form.
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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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |