US4568014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding of metallic glass to crystalline metal
Assignee: United States, INTERIOR THE, Secretary of
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Filing: 1983-09-29
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Granted: 1986-02-04
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Expires: 2003-09-29
Abstract
Abstract A method of bonding a first thin crystalline metal to a second thin metal such as metallic glass is disclosed. Initially, the metallic glass is coated with a thin thermal barrier layer. Next, the first metal is heated to a temperature sufficient for diffusion bonding. Finally, the metallic glass is maintained at ambient temperature as the metallic glass is diffusion bonded to the crystalline metal. The thermal barrier layer prevents the metallic glass from reaching a phase transition temperature during the diffusion bonding. Consequently, a composite product having a base layer of crystalline metal and an outer layer of metallic glass is produced. Preferably, the diffusion bonding is produced by evacuated roll-bonding and the coating is attached to the metallic glass by electroplating. A plurality of metallic glass layers and crystalline metal layers can be bonded together to produce a sandwiched composite product.
Inventors
- 👤 Brent W. Madsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:07
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/04; B23K35/00; B23K35/001
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
122 words
A method of bonding a first thin metal having a high diffusion bonding temperature to a second thin metal having a low phase transition temperature substantially below the high diffusion bonding temperature of the first metal, comprising the steps of: coating a surface of the second metal with a thin thermal barrier layer; heating the first metal separately to a high temperature sufficient for diffusion bonding of the first metal; bringing together a heated surface of the first metal and the ambient temperature coated surface of the second metal; and diffusion bonding the surface of the heated first metal to the coated surface of the second metal such that the second metal does not exceed the phase transition temperature at any time.
Claim 2
Independent Claim
122 words
A method of bonding a first thin metal having a high diffusion bonding temperature to a second thin metal having a low phase transition temperature substantially below the high diffusion bonding temperature of the first metal, comprising the steps of: coating a surface of the second metal with a thin thermal barrier layer; heating the first metal separately to a high temperature sufficient for diffusion bonding of the first metal; bringing together a heated surface of the first metal and the ambient temperature coated surface of the second metal; and diffusion bonding the surface of the heated first metal to the coated surface of the second metal such that the second metal does not exceed the phase transition temperature at any time.
Claim 3
Dependent Claim
25 words
A method of bonding as claimed in claim 1 wherein the first metal is a crystalline metal and the second metal is a metallic glass.
Claim 4
Dependent Claim
25 words
A method of bonding as claimed in claim 2 wherein the diffusion bonding is produced by rolling the two metals between rollers at ambient temperature.
Claim 5
Dependent Claim
16 words
A method of bonding as claimed in claim 3 wherein the coating is produced by electroplating.
Claim 6
Dependent Claim
30 words
A method of bonding as claimed in claim 4 wherein the roll-bonding occurs in a chamber, and further including the steps of evacuating the chamber before roll-bonding the two metals.
Claim 7
Dependent Claim
25 words
A method of bonding as claimed in claim 5 and further including the step of removing any impurities from the two metals prior to roll-bonding.
Claim 8
Dependent Claim
36 words
A method of bonding as claimed in claim 6 wherein the removing of impurities from the two metals includes the steps of cleaning in an ultrasonic bath, washing with alcohol, and blow drying with warm air.
Claim 9
Dependent Claim
15 words
A method of bonding as claimed in claim 6 wherein the barrier layer is nickel.
Claim 10
Dependent Claim
23 words
A method of bonding as claimed in claim 8 wherein the first metal is steel and the second metal is iron with boron.
Claim 11
Dependent Claim
64 words
A method of bonding as claimed in claim 5 wherein two second thin metals are coated on a surface with a thin thermal barrier layer, and wherein the heated first metal is roll bonded between opposed layers of the two second metals so at ambient temperature that two sides of the first metal are covered by the second metal to produce a sandwiched product.
Claim 12
Dependent Claim
50 words
A method of bonding as claimed in claim 10 wherein the two second metals are each coated on opposed sides, wherein two such layered products are produced, and wherein the two layered products at ambient temperature are roll bonded to another heated first metal to produce a multiply sandwiched product.
Claim 13
Dependent Claim
77 words
A composite product by the process of claim 1 having high strength and corrosion resistance comprising: a thin outer layer of metallic glass; a thin intermediate layer of a thermal barrier material which is plated to said outer layer; and a thin base layer of crystalline metal to which said outer layer is attached by diffusion bonding as said intermediate layer is at ambient temperature and said base layer is at a temperature sufficient for diffusion bonding.
Claim 14
Dependent Claim
19 words
A composite product by process as claimed in claim 12 wherein the diffusion bonding is achieved by vacuum roll-bonding.
Claim 15
Dependent Claim
74 words
A composite product by process as claimed in claim 13 and further including a further outer layer of metallic glass to which a further intermediate layer of a thermal barrier material has been attached by plating, said further intermediate layer also being simultaneously roll-bonded at ambient temperature to the opposite side of said base layer of crystalline metal such that the composite product has a crystalline metal layer sandwiched between two metallic glass layers.
Claim 16
Dependent Claim
110 words
A composite product by process as claimed in claim 14 and further including two sandwiched composite products: another intermediate layer of a thermal-barrier material which is attached to a respective outer surface of each said sandwiched composite product; and a further base layer of crystalline metal on each side of which said respective sandwiched products are attached by heating said further base to a temperature sufficient for diffusion bonding and subsequently roll-bonding both of said another intermediate layers which are both at ambient temperature to opposite sides of said further base layer of crystalline metal such that the composite product has three crystalline metal layers sandwiched between metallic glass layers.
Claim 17
Dependent Claim
86 words
A composite product by process as claimed in claim 13 and further including a plurality of outer layers; a plurality of intermediate layers attached to a respective outer layer; and a plurality of base layers, each of said base layers being sandwiched between respective said outer layers which are attached to respective said base layers by heating said respective base layer to a temperature sufficient for diffusion bonding and subsequently roll-bonding a respective said intermediate layer at ambient temperature to a respective said heated base layer.
References Cited (Backward Citations)
US2390452A
Cited
US2484118A
Cited
US3164897A
Cited
US3173202A
Cited
US3350773A
Cited
US3276103A
Cited
US3300838A
Cited
US3970237A
Cited
US4046304A
Cited
US3997099A
Cited
US4011982A
Cited
DE2805233A1
Cited
US4257549A
Cited
US4423120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |