US3793700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reshaping metal matrix composite material
Assignee: General Dynamics Corp
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Filing: 1972-09-01
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Granted: 1974-02-26
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Expires: 1992-09-01
Abstract
Abstract A method of reshaping high strength fiber reinforced metal composite sheets is disclosed. The sheets, which typically comprise unidirectionally oriented boron fibers in an aluminum matrix are metallurgically bonded to a pair of thin ductile metal face sheets. The resulting composite is then reshaped as desired by bending the composite along lines parallel to the fiber direction. Finally, the face sheets are removed, such as by acid etching, except in those areas in which it is desired to retain portions of the overlayer. Among other advantages, this technique permits much sharper radius bends by much simpler techniques that those previously used with such composite materials.
Inventors
- 👤 C Maikish
- 👤 H Wiant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:12
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/14; B64; B64G; B64G1/00; B64G1/22; B32B1/00; B32B15/20; C; C22; C22C; C22C47/00; C22C47/20; B32B2262/00; B32B2262/10; B32B2311/00; B32B2311/24; B32B2605/00; B32B2605/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49801; Y10T428/00; Y10T428/12; Y10T428/12444; Y10T428/12486
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
The method according to claim 1 wherein said composite sheet comprises high strength fibers comprising boron embedded in an aluminum matrix.
Claim 2
Dependent Claim
21 words
The method according to claim 2 wherein said ductile metal sheets comprise mild steel sheets diffusion bonded to said composite sheet.
Claim 3
Dependent Claim
23 words
The method according to claim 3 wherein said ductile metal sheets are at least partially removed by treating selected areas with nitric acid.
Claim 4
Dependent Claim
52 words
The method according to claim 4 where said composite sheet has a thickness of from about 0.02 to 0.05 inch, said ductile metal sheets have thicknesses of from about 0.015 to 0.025 inch and said sheet is bent to a radius as narrow as three times the thickness of the composite sheet.
Claim 5
Independent Claim
85 words
A method of reshaping high strength fiber reinforced metal composite sheets which comprises: providing a composite sheet comprising high strength boron fibers substantially unidirectionally arrayed in an aluminum matrix; metallurigically bonding a thin mild steel cover sheet to each face of said composite sheet to form a unitary sandwich structure; reshaping said sheet by bending said sandwich as desired about lines which are substantially parallel to said fibers; and treating at least portions of said sandwich with nitric acid to dissolve away the treated portions.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |