Brazing paste

Details Brazing paste Brazing paste

1995-06-05

1999-10-12

Wyszomierski, George

Metal treatment

Compositions

75255, 2282629, B23K 3526

Patent

active

059649631

ABSTRACT:
Thermal stresses normally associated with brazing are alleviated by a low temperature brazing technique of the present invention. A low-temperature brazing paste, preferably suitable to be melted at temperatures of no greater than 200.degree. C. (e.g., 100-200.degree. C.), containing nanoscale (.ltoreq.100 nanometer) size particles of gold, cadmium, copper, zinc, tin, lead, silver, silicon, chromium, cobalt, antimony, bismuth, aluminum, iron, magnesium, nitrogen, carbon, boron, and alloys and composites of these materials, is applied as a bead or as a powder spray at the junction of two components desired to be joined together. Energy from a source such as a laser beam (for example a CO.sub.2 laser, an Nd-Yag laser or an excimer laser), flame, arc, plasma, or the like, is "walked" along the brazing material. The energy beam is sufficient to cause melting and re-crystallization of the nanoscale-particle-containing brazing paste. In an exemplary application of the process, blades (vanes) are brazed to the housing and/or to the shroud of an automatic transmission impeller assembly, preferably using the low-temperature brazing paste containing nanoscale (.ltoreq.100 nanometer) size particles of gold, cadmium, copper and/or zinc, or other suitable nanoscale brazing materials.

REFERENCES:
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patent: 5403375 (1995-04-01), Konig et al.
patent: 5407458 (1995-04-01), Konig et al.
patent: 5441553 (1995-08-01), Polizzotti et al.
patent: 5474808 (1995-12-01), Aslam
patent: 5541006 (1996-07-01), Conley
patent: 5679445 (1997-10-01), Massa et al.
patent: 5681653 (1997-10-01), Hammond et al.
patent: 5714626 (1998-02-01), Abma et al.
patent: 5718586 (1998-02-01), Sharp et al.
patent: 5731075 (1998-03-01), Goto et al.

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