Patent US4228944A successfully refreshed from Google Patents.
US4228944A
Expired / Lapsed
US
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Method of bonding substrates made of metal or alloy
Assignee: Mitsubishi Electric Corp
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Filing: 1978-10-24
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Granted: 1980-10-21
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Expires: 1998-10-24
Abstract
Abstract Substrates made of a metal or an alloy are bonded by coating a brazing flux incorporating a metallic powder or a metal compound powder on the surface of the substrate having a melting point of higher than 700 DEG C.; and heating them at a temperature higher than a melting point of the flux but lower than a melting point of the metal of the metallic powder or the metal compound powder whereby a molten crystallization and a mutual diffusion are caused between the substrates and the metal activated by the molten flux.
Inventors
- 👤 Minoru Inamura
- 👤 Noboru Takeuchi
- 👤 Kazuhiro Inukai
- 👤 Kentaro Taninouchi
- 👤 Shin Utsunomiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:50
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/19; B22; B22F; B22F7/00; B22F7/06; B23K35/00; B23K35/001; B23K35/22; B23K35/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
A method of bonding metal or metal alloy substrates in air, comprising: coating a solid brazing flux containing a powdered metal or powdered metal compound onto the surface of said substrates having a melting point greater than 700° C.; and heating said coated substrates to a temperature greater than the melting point of the flux but less than the melting point of the powdered metal or powdered metal compound, whereby molten crystallization and mutual diffusion occurs between metal of the surfaces of the substrates and the activated metal derived from the powdered metal or powdered metal compound containing flux.
Claim 2
Independent Claim
99 words
A method of bonding metal or metal alloy substrates in air, comprising: coating a solid brazing flux containing a powdered metal or powdered metal compound onto the surface of said substrates having a melting point greater than 700° C.; and heating said coated substrates to a temperature greater than the melting point of the flux but less than the melting point of the powdered metal or powdered metal compound, whereby molten crystallization and mutual diffusion occurs between metal of the surfaces of the substrates and the activated metal derived from the powdered metal or powdered metal compound containing flux.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the metal compound powder is a powder of a metal chloride or a metal salt which is convertable into a metal.
Claim 4
Dependent Claim
23 words
The method of claim 1 or 2, wherein the brazing flux is a flux having a fluoride, chloride, borate or iodide principal component.
Claim 5
Dependent Claim
17 words
The method of claim 1, wherein said metal compouond is silver chloride, copper chloride or cobalt chloride.
Claim 6
Dependent Claim
23 words
The method of claim 1, wherein a copper or copper alloy substrate is bonded to a silver-tungsten, copper-tungsten, iron or stainless steel substrate.
Claim 7
Dependent Claim
27 words
The process of claim 1, wherein said substrates bonded are: copper to silver-tungsten, iron to iron, copper to iron, iron to nickel and stainless steel to nickel.
Claim 8
Dependent Claim
19 words
The method of claim 1, wherein said substrates bonded are:silver-tungsten to copper, copper-tungsten to copper and silver-tungsten to iron.
Claim 9
Dependent Claim
19 words
The process of claim 1, wherein said brazing flux is based upon potassium tetrafluoroborate, sodium borate, or boric acid.
Claim 10
Dependent Claim
24 words
The method of claim 1, wherein the metal atom of said metal compound has an ionization potential less than the components of said flux.
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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |