US3630694A
Expired / Lapsed
US
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Aluminum/ferritic stainless steel/steel composites
Assignee: ETI EXPLOSIVES TECHNOLOGIES INTE
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Filing: 1969-10-29
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Granted: 1971-12-28
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Expires: 1989-10-29
Abstract
Abstract Metal composites in which a layer of ferritic stainless steel having a yield strength of up to about 60,000 p.s.i. before bonding is metallurgically bonded to, and sandwiched between, a layer of aluminum and a layer of steel, have improved hightemperature stability, and afford electrical transition joints of better high-temperature capability than aluminum/steel transition joints heretofore known.
Inventors
- 👤 Thomas J Enright
- 👤 Sadun S Tor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:38
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/06; B23K20/08; B23K35/00; B23K35/001; B23K35/002; H; H01; H01R; H01R4/00; H01R4/58; H01R4/62; H01R4/625; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/94; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12639; Y10T428/12646; Y10T428/12653; Y10T428/12736; Y10T428/1275; Y10T428/12757; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12972; Y10T428/12979
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
36 words
A three-layered composite of claim 1 wherein the total electrical resistance provided by the aluminum/ferritic stainless steel and ferritic stainless steel/steel interfaces is less than about 1 micro-ohm after heating at 650* F. for 2,000 hours.
Claim 2
Dependent Claim
20 words
A composite of claim 2 which has shear and tensile strengths greater than those of the aluminum layer before bonding.
Claim 3
Dependent Claim
25 words
A composite of claim 2 wherein the auminum/ferritic stainless steel interface comprises by interfacial area at least about 90 percent direct aluminuM-to-ferritic stainless steel bond.
Claim 4
Dependent Claim
19 words
A composite of claim 2 wherein the aluminum layer contains less than 2.1 percent magnesium plus silicon by weight.
Claim 5
Dependent Claim
23 words
A composite of claim 5 wherein the layer of steel is low-carbon steel containing a maximum of about 0.3 percent carbon by weight.
Claim 6
Independent Claim
88 words
A method of producing aluminum/steel electrical transition joints having improved electrical stability after prolonged exposure to temperatures of about 650* F. which comprises metallurgically bonding a layer of said aluminum to a layer of said steel via an interlayer of ferritic stainless steel having a yield strength before bonding of up to about 60,000 p.s.i., the conditions under which the layer of aluminum is bonded to said interlayer being such that the bond therebetween comprises, by interfacial area, at least about 70 percent direct aluminum-to-ferritic stainless steel bond.
Claim 7
Dependent Claim
23 words
A method of claim 7 wherein said layer of steel is low-carbon steel containing a maximum of about 0.3 percent carbon by weight.
Claim 8
Dependent Claim
18 words
A method of claim 8 wherein the aluminum is bonded to the ferritic stainless steel by explosion bonding.
Claim 9
Dependent Claim
31 words
A method of claim 9 wherein the aluminum layer contains less than 2.1 percent magnesium plus silicon by weight, and the ferritic stainless steel is in the annealed condition before bonding.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |