US4628002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon carbide monofilament for transverse composite properties
Assignee: Specialty Materials Inc
•
Filing: 1985-05-28
•
Granted: 1986-12-09
•
Expires: 2005-05-28
Abstract
Abstract This invention is directed to a surface treatment for SiC monofilament developed for the purpose of increasing the transverse strain-to-failure of composites, particularly aluminum composites. The surface treatment includes a fine grain SiC region adjacent to the bulk or stoichiometric SiC region and a transition region which interacts with the matrix material.
Inventors
- 👤 Raymond J. Suplinskas
- 👤 Thomas W. Henze
- 👤 James V. Marzik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:31
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C23; C23C; C23C16/00; C23C16/02; C23C16/0272; C23C16/029; C23C16/22; C23C16/30; C23C16/32; C23C16/325; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/292; Y10T428/2933
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
An SiC monofilament for use in combination with a matrix material to form a composite material comprising: an SiC monofilament having a bulk SiC layer; a layer of fine grain SiC having a finer grain size than the grain size of the bulk SiC deposited on the bulk SiC; and a surface transition zone deposited on the fine grain SiC layer for interacting with the matrix.
Claim 2
Dependent Claim
66 words
An SiC monofilament for use in combination with a matrix material to form a composite material comprising: an SiC monofilament having a bulk SiC layer; a layer of fine grain SiC having a finer grain size than the grain size of the bulk SiC deposited on the bulk SiC; and a surface transition zone deposited on the fine grain SiC layer for interacting with the matrix.
Claim 3
Dependent Claim
33 words
A monofilament as described in claim 1 wherein the bulk SiC has a definitive crystal size, and said fine grain crystal size is one tenth of the crystal size of the bulk SiC.
Claim 4
Dependent Claim
35 words
A monofilament as described in claim 1 wherein the matrix material is aluminum, the surface transition zone comprises a carbon-rich region abutting the fine grain SiC layer, and an outermost region of pure silicon deposit.
Claim 5
Dependent Claim
18 words
A monofilament as described in claim 3 wherein the minimum silicon to carbon ratio is 0.2 to 0.5.
Claim 6
Dependent Claim
15 words
A monofilament as described in claim 1 wherein the surface transition zone is boron carbide.
Claim 7
Dependent Claim
19 words
A monofilament as describedin claim 5 wherein the thickness of the boron carbide surface transition zone is 7-10 microns.
Claim 8
Dependent Claim
30 words
A monofilament as described in claim 1 wherein the grain size of the bulk SiC is 500-1,000 nanometers, and the grain size of the fine grain SiC is 50-100 nanometers.
Claim 9
Dependent Claim
18 words
A monofilament as described in claim 1 wherein the-thickness of the carbon-rich region is less than 1 micron.
Claim 10
Dependent Claim
19 words
A monofilament as described in claim 8 wherein the thickness of the carbon-rich region is 0.4 to 0.5 micron.
Claim 11
Dependent Claim
18 words
A monofilament as described in claim 9 wherein the depth of pure silicon outermost region is 1 micron.
References Cited (Backward Citations)
US3622369A
Cited
US3658680A
Cited
US4131697A
Cited
US4068037A
Cited
US4315968A
Cited
US4340636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |