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US4838474A
Expired / Lapsed
US
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Method of diffusion bonding of aluminum or alumina ceramics
Assignee: National Institute for Materials Science
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Filing: 1988-03-03
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Granted: 1989-06-13
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Expires: 2008-03-03
Abstract
Abstract A method of diffusion bonding of aluminum or an alumina ceramic to aluminum, an alumina ceramic or a metal other than aluminum, which comprises interposing an aluminum alloy prepared by including 0.2 to 3% by weight of magnesium and/or 0.1 to 1.5% by weight of lithium into aluminum or an aluminum alloy between the surfaces of materials to be bonded, and heating said surfaces to be bonded of these materials under pressure at a temperature at which magnesium or lithium diffuses.
Inventors
- 👤 Osamu Ohashi
- 👤 Ken Sasabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:06
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/16; B23K35/00; B23K35/001; B23K35/002
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
A method of diffusion bonding aluminum or an alumina ceramic to aluminum, an alumina ceramic or a metal other than aluminum which comprises the steps of interposing an aluminum alloy comprising 0.1 to 1.5% by weight of lithium between the surfaces to be bonded and heating said surfaces under pressure to a temperature at which said lithium diffuses.
Claim 2
Independent Claim
58 words
A method of diffusion bonding aluminum or an alumina ceramic to aluminum, an alumina ceramic or a metal other than aluminum which comprises the steps of interposing an aluminum alloy comprising 0.1 to 1.5% by weight of lithium between the surfaces to be bonded and heating said surfaces under pressure to a temperature at which said lithium diffuses.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein said interposed aluminum alloy further contains at least one metal selected from the group consisting of Cu, Mn, Si, Zn, Fe and Ti.
Claim 4
Dependent Claim
30 words
The method of claim 1 wherein said metal other than aluminum is a metal selected from the group consisting of iron, iron alloys, copper, copper alloys, titanium and titanium alloys.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein said interposed aluminum alloy is in the formm of a plate having a thickness of 0.02 to 5 mm.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the heating temperature is at least 400° C. but below the melting point of the interposed aluminum alloy.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the pressure is 0.1 to 3 kg/mm 2 .
Claim 8
Independent Claim
70 words
A method of diffusion bonding aluminum or an alumina ceramic to aluminum, an alumina ceramic or a metal other than aluminum which comprises the steps of interposing an aluminum alloy comprising 0.2 to 3 wt. % magnesium and 0.1 to 1.5 wt. % lithium between the surfaces to be bonded and heating said surfaces under pressure to a temperature at which at least one of said magnesium or lithium diffuses.
Claim 9
Independent Claim
70 words
A method of diffusion bonding aluminum or an alumina ceramic to aluminum, an alumina ceramic or a metal other than aluminum which comprises the steps of interposing an aluminum alloy comprising 0.2 to 3 wt. % magnesium and 0.1 to 1.5 wt. % lithium between the surfaces to be bonded and heating said surfaces under pressure to a temperature at which at least one of said magnesium or lithium diffuses.
Claim 10
Dependent Claim
29 words
The method of claim 7, wherein said interposed aluminum alloy further comprises at least one metal selected from the group consisting of Cu, Mn, Si, Zn, Fe and Ti.
Claim 11
Dependent Claim
30 words
The method of claim 7, wherein said metal other than aluminum is a metal selected from the group consisting of iron, iron alloys, copper, copper alloys, titanium and titanium alloys.
Claim 12
Dependent Claim
25 words
The method of claim 7, wherein said interposed aluminum alloy is in the form of a plate having the thickness of 0.02 to 5 mm.
Claim 13
Dependent Claim
24 words
The method of claim 7, wherein the heating temperature is at least 400° C. but below the melting point of the interposed aluminum alloy.
Claim 14
Dependent Claim
15 words
The method of claim 7, wherein the pressure is 0.1 to 3 kg/mm 2 .
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |