US4010884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating a filament-reinforced composite article
Assignee: RTX Corp
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Filing: 1974-11-20
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Granted: 1977-03-08
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Expires: 1994-11-20
Abstract
Abstract A filament-reinforced composite article is fabricated from monolayer boron fiber tapes and laminates of titanium. The tapes which have the boron fibers attached to an aluminum foil are positioned in a multi-ply layup with interleaved titanium laminates in the form of foils or screening. The layup is subjected to heat and pressure in a diffusion bonding process to compact the layup materials and bond the fibers in the matrix of aluminum and titanium. The titanium in the matrix improves the impact load resistance of the article by improving ductility and impact strength.
Inventors
- 👤 Edward A. Rothman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:52
CPC Classifications
C; C22; C22C; C22C47/00; C22C47/02; C22C47/06; C22C47/062; C22C47/068; C22C47/20; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/1234; Y10T428/12431; Y10T428/12438; Y10T428/12444; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12632; Y10T428/12736; Y10T428/12743; Y10T428/24; Y10T428/24752; Y10T428/249921; Y10T428/249924; Y10T428/249928; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
An improved method of fabricating an impact-resistant filament-reinforced composite article having a plurality of high stiffness, high tensile strength, low density filaments in a lower strength matrix comprising: positioning a plurality of filament-reinforced foils comprising parallel boron filaments supported on a foil and attached thereto by a fused binder in a multi-ply layup, said foil and said binder consisting essentially of aluminum or alloys thereof; placing at last one laminate of titanium or an alloy thereof between the filament-reinforced foils; and subjecting the multi-ply layup to heat and pressure in a diffusion bonding process to join the titanium and the reinforced foils together in a matrix containing the reinforcing filaments.
Claim 2
Dependent Claim
110 words
An improved method of fabricating an impact-resistant filament-reinforced composite article having a plurality of high stiffness, high tensile strength, low density filaments in a lower strength matrix comprising: positioning a plurality of filament-reinforced foils comprising parallel boron filaments supported on a foil and attached thereto by a fused binder in a multi-ply layup, said foil and said binder consisting essentially of aluminum or alloys thereof; placing at last one laminate of titanium or an alloy thereof between the filament-reinforced foils; and subjecting the multi-ply layup to heat and pressure in a diffusion bonding process to join the titanium and the reinforced foils together in a matrix containing the reinforcing filaments.
Claim 3
Dependent Claim
20 words
An improved method of fabricating as defined in claim 1 wherein the boron filaments are silicon carbide coated boron filaments.
Claim 4
Dependent Claim
37 words
A method of fabricating a filament reinforced composite article as defined in claim 1 wherein: the titanium laminate placed between the filament reinforced foils is a titanium foil not less than 0.004 inch (0.1 mm) in thickness.
Claim 5
Dependent Claim
36 words
A method of fabricating a filament-reinforced composite article as in claim 1 wherein the step of subjecting the multi-ply layup to hat and pressure includes heating the layup to a temperature not greater than 1050° F.
Claim 6
Dependent Claim
26 words
The method of fabricating as in claim 4 wherein the step of subjecting includes pressing the plies together at a pressure not less than 5000 psi.
Claim 7
Dependent Claim
34 words
The method of fabricating a filament reinforced composite article as defined in claim 1 wherein the step of positioning comprises positioning all of the filament-reinforced foils with the filaments extending in the same direction.
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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |