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US4260666A Expired / Lapsed US ⏱️ 0.0 years remaining

Brazed metal articles

Assignee: Honeywell International Inc
•
Filing: 1979-06-18
•
Granted: 1981-04-07
•
Expires: 1999-06-18
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Abstract

Abstract Brazing of metal parts employing a homogeneous, ductile, filler metal foil is disclosed. The brazing foil, useful for brazing cobalt based alloys, has a composition consisting essentially of 0 to about 4 atom percent iron, 0 to about 26 atom percent chromium, 0 to about 20 atom percent nickel, 0 to about 4 atom percent tungsten, 0 to about 4 atom percent molybdenum, 0 to about 20 atom percent boron, 0 to about 12 atom percent silicon, 0 to about 2 atom percent carbon and the balance essentially cobalt and incidental impurities. In addition to containing the foregoing elements within the above-noted composition ranges, the composition must be such that the total of iron, chromium, nickel, tungsten, molybdenum and cobalt ranges from about 75 to 85 atom percent and the total of boron, silicon and carbon ranges from about 15 to 25 atom percent. The ductile foil permits fabrication of preforms of complex shapes which do not require binders and/or fluxes necessary for brazing powders presently used to braze cobalt and nickel base alloys.

Inventors

  • 👤 Nicholas J. DeCristofaro
  • 👤 Samuel Levinson
  • 👤 Peter Sexton

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 06:14
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0222; B23K35/0233; B23K35/22; B23K35/24; B23K35/30; B23K35/3046; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12944

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 145 words
A brazed metal article, said article having been brazed with a filler material in the form of a homogeneous, ductile brazing foil composed of metastable material having at least 50 percent glassy structure, said foil having a composition consisting essentially of 0 to about 4 atom percent iron, 0 to about 26 atom percent chromium, 0 to about 20 atom percent nickel, 0 to about 4 atom percent tungsten, 0 to about 4 atom percent molybdenum, 0 to about 20 atom percent boron, 0 to about 12 atom percent silicon, 0 to about 2 atom percent carbon and the balance essentially cobalt and incidental impurities, wherein the composition is such that the total of iron, chromium, nickel, tungsten, molybdenum and cobalt ranges from about 75 to 85 atom percent and the total of boron, carbon and silicon ranges from about 15 to 25 atom percent.
Claim 2
Dependent Claim 145 words
A brazed metal article, said article having been brazed with a filler material in the form of a homogeneous, ductile brazing foil composed of metastable material having at least 50 percent glassy structure, said foil having a composition consisting essentially of 0 to about 4 atom percent iron, 0 to about 26 atom percent chromium, 0 to about 20 atom percent nickel, 0 to about 4 atom percent tungsten, 0 to about 4 atom percent molybdenum, 0 to about 20 atom percent boron, 0 to about 12 atom percent silicon, 0 to about 2 atom percent carbon and the balance essentially cobalt and incidental impurities, wherein the composition is such that the total of iron, chromium, nickel, tungsten, molybdenum and cobalt ranges from about 75 to 85 atom percent and the total of boron, carbon and silicon ranges from about 15 to 25 atom percent.
Claim 3
Dependent Claim 16 words
The brazed metal article of claim 1 wherein said foil is at least about 80% glassy.
Claim 4
Dependent Claim 13 words
The brazed metal article of claim 1 wherein said foil is substantially glassy.
Claim 5
Dependent Claim 21 words
The brazed metal article of claim 1 wherein said foil has a thickness ranging from about 20 μm to 90 μm.
Claim 6
Dependent Claim 48 words
A brazed metal article, said article having been brazed with a filler metal in the form of a homogeneous ductile cobalt based brazing foil composed of metastable material having at least 50 percent glassy structure, said foil having a thickness ranging from about 20 μm to 90 μm.
Claim 7
Dependent Claim 48 words
A brazed metal article, said article having been brazed with a filler metal in the form of a homogeneous ductile cobalt based brazing foil composed of metastable material having at least 50 percent glassy structure, said foil having a thickness ranging from about 20 μm to 90 μm.

References Cited (Backward Citations)

US4036638A Cited
US4038073A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-04-06 1984-10-06 1985-04-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-04-06 1988-10-06 1989-04-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-04-06 1992-10-06 1993-04-07 $7700.00 Window Closed / Lapsed

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