Metal treatment – Compositions – Fluxing
Patent
1982-08-02
1984-02-14
O'Keefe, Veronica
Metal treatment
Compositions
Fluxing
148 25, 228122, B23K 3534
Patent
active
044314655
ABSTRACT:
An improved brazing alloy paste comprises a brazing alloy powder mixed with a ductile metal spacer powder comprised of spherical particles with a predetermined diameter limit and having a higher melting temperature than that of the alloy, both powders being suspended in a gel-like substance. This composite paste produces a brazed joint having a gap with a controlled width and the ductile metal absorbs stresses developed between dissimilar brazed parts as when a tungsten carbide tool bit and the supporting steel shank cool after they are brazed together. The quantity of spherical spacer powder in the mixture is limited to 1-8% by weight of the mixture, preferably 5%, in order to prevent stacking of the spheres and to insure a gap spacing determined by the diameter of the spheres.
REFERENCES:
patent: 3444613 (1969-05-01), Foerster
patent: 3589952 (1971-06-01), Burne
patent: 4273593 (1981-06-01), Mastrangelo
Mizuhara Howard
Pattanaik Surya
Castle Donald R.
GTE Products Corporation
Lawler John F.
O'Keefe Veronica
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