Patent US4481257A successfully refreshed from Google Patents.
US4481257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boron coated silicon carbide filaments
Assignee: Avco Corp
•
Filing: 1983-06-17
•
Granted: 1984-11-06
•
Expires: 2003-06-17
Abstract
Abstract Silicon carbide filament is produced by overcoating a carbon monofilament core using continuous process vapor deposition. The deposition takes place by passing the carbon monofilament through a reactor into which gaseous sources of silicon and carbon are injected. At a deposition temperature of about 2370° F., a deposit of fine grained beta crystals of silicon carbide are formed. Application of a thin protective coating of boron-based refractory material on the surface of the silicon carbide filament both adds strength and provides a surface which is readily bonded to both metals and epoxy matrix materials during the casting of composite structures.
Inventors
- 👤 Raymond J. Suplinskas
- 👤 Albert W. Hauze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:19
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/126; D02; D02G; D02G3/00; D02G3/02; D02G3/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916; Y10T428/2933
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
39 words
A high-strength high-modulus filament comprising: a silicon carbide filament substrate having applied thereto a coating of boronic refractory material which has been deposited on said substrate heated to a temperature in the range of 1400° F. to 2550° F.
Claim 2
Dependent Claim
39 words
A high-strength high-modulus filament comprising: a silicon carbide filament substrate having applied thereto a coating of boronic refractory material which has been deposited on said substrate heated to a temperature in the range of 1400° F. to 2550° F.
Claim 3
Dependent Claim
31 words
The invention as described in claim 1 wherein the boron refractory material is boron deposited on said substrate heated to a temperature in the range of 1400° F. to 1500° F.
Claim 4
Dependent Claim
32 words
The invention as described in claim 1 wherein the boronic refractory material is boron carbide deposited on said substrate heated to a temperature in the range of 1800° F. to 2200° F.
Claim 5
Dependent Claim
16 words
The invention as described in claim 1 wherein the coating thickness is 9 microns or less.
Claim 6
Dependent Claim
20 words
The invention as described in claim 1 wherein the coating thickness for wetting the matrix is less than 1.0 micron.
Claim 7
Dependent Claim
26 words
The invention as described in claim 1 wherein the thickness of the coating for use in a cast aluminum matrix ranges from 0.2 to 1 micron.
Claim 8
Dependent Claim
24 words
The invention as described in claim 2 wherein the thickness of the coating for use in metal matrix ranges from 0.1 to 9 microns.
Claim 9
Dependent Claim
24 words
The invention as described in claim 3 wherein the thickness of the coating for use in metal matrix ranges from 0.1 to 9 microns.
Claim 10
Dependent Claim
21 words
The invention as described in claim 2 wherein the coating thickness for wetting a resin matrix is less than 0.1 microns.
Claim 11
Dependent Claim
25 words
The invention as described in claim 1 wherein the coating thickness for bonding to a diffusion-bonded or hot-molded metal matrix is 6 to 9 microns.
References Cited (Backward Citations)
US3811940A
Cited
US4068037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |