Patent US4194672A successfully refreshed from Google Patents.
US4194672A
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US
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Process for the diffusion welding of copper and stainless steel
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1978-09-05
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Granted: 1980-03-25
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Expires: 1998-09-05
Abstract
Abstract A process for the diffusion welding of copper and stainless steel, which comprises sandwiching a thin layer of at least one metal selected from the group consisting of Ni, Ni-base alloys, Cr, Ni-Cr, and Cr-Ni with little gas contents, as an insert metal, between the surfaces of copper and stainless steel to be bonded, and then diffusion welding the sandwich.
Inventors
- 👤 Yoshimitsu Uto
- 👤 Takashi Omae
- 👤 Yasuhiro Fukaya
- 👤 Yasuyuki Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:41
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/004; B23K20/00; B23K20/16; B23K20/22; B23K20/227
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
134 words
A process for the diffusion welding of copper and stainless steel, which comprises the step of smoothening the surfaces of copper and stainless steel to be bonded together, cleaning the both surfaces until chemically active surfaces are exposed, and bringing either active surface into close contact with the mating stainless steel or copper surface smoothened and cleaned in advance, through a layer of insert metal which is at least one metal selected from the group consisting of Ni, Ni-base alloys, and Cr, said layer of insert metal containing not more than 140 ppm O 2 and ranging in thickness more than 5μ; and the step of bonding said copper, insert metal layer, and stainless steel altogether by diffusion welding in a vacuum or other non-oxidizing atmosphere at a temperature from 850° to 950° C.
Claim 2
Dependent Claim
134 words
A process for the diffusion welding of copper and stainless steel, which comprises the step of smoothening the surfaces of copper and stainless steel to be bonded together, cleaning the both surfaces until chemically active surfaces are exposed, and bringing either active surface into close contact with the mating stainless steel or copper surface smoothened and cleaned in advance, through a layer of insert metal which is at least one metal selected from the group consisting of Ni, Ni-base alloys, and Cr, said layer of insert metal containing not more than 140 ppm O 2 and ranging in thickness more than 5μ; and the step of bonding said copper, insert metal layer, and stainless steel altogether by diffusion welding in a vacuum or other non-oxidizing atmosphere at a temperature from 850° to 950° C.
Claim 3
Dependent Claim
20 words
A process as set forth in claim 1, wherein said copper is plated with Ni as said insert metal layer.
Claim 4
Dependent Claim
24 words
A process as set forth in claim 1, wherein a vacuum-melted Ni foil or Ni alloy foil is interposed as said insert metal layer.
Claim 5
Dependent Claim
20 words
A process as set forth in claim 1, wherein said copper is plated with Cr as said insert metal layer.
Claim 6
Dependent Claim
29 words
A process as set forth in claim 1, wherein said copper is plated with Cr and then with Ni to form a double plating as said insert metal layer.
Claim 7
Dependent Claim
29 words
A process as set forth in claim 1, wherein said copper is plated with Ni and then with Cr to form a double plating as said insert metal layer.
Claim 8
Dependent Claim
29 words
A process as set forth in claim 1, wherein said copper is plated with Cr and said stainless steel is plated with Ni, each as said insert metal layer.
Claim 9
Dependent Claim
29 words
A process as set forth in claim 1, wherein said copper is plated with Ni and said stainless steel is plated with Cr, each as said insert metal layer.
Claim 10
Dependent Claim
45 words
A process as set forth in claim 1, wherein said copper is plated with Cr as said insert metal layer, and a vacuum-melted Ni foil or Ni alloy foil is interposed as an additional insert metal layer between said Cr-plated copper and said stainless steel.
Claim 11
Dependent Claim
21 words
A process as set forth in claim 1, wherein said stainless steel is plated with Ni as said insert metal layer.
Claim 12
Dependent Claim
21 words
A process as set forth in claim 1, wherein said stainless steel is plated with Cr as said insert metal layer.
Claim 13
Dependent Claim
30 words
A process as set forth in claim 1, wherein said stainless steel is plated with Ni and then with Cr to form a double plating as said insert metal layer.
Claim 14
Dependent Claim
30 words
A process as set forth in claim 1, wherein said stainless steel is plated with Cr and then with Ni to form a double plating as said insert metal layer.
Claim 15
Dependent Claim
46 words
A process as set forth in claim 1, wherein said stainless steel is plated with Cr as said insert metal layer, and a vacuum-melted Ni foil or Ni alloy foil is interposed as an additional insert metal layer between said Cr-plated stainless steel and said copper.
References Cited (Backward Citations)
US3108861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |