Multi-layer composite brazing alloy

Details Multi-layer composite brazing alloy Multi-layer composite brazing alloy

1980-06-20

1982-07-20

Lewis, Michael L.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

228263A, 228263G, 228 56, 428677, 428680, 428684, 428925, B32B 1520

Patent

active

043406505

ABSTRACT:
A multi-layer composite brazing alloy useful in mine drills for attaching hardened bits, such as tungsten carbide, to bit holders made of steel and the like, comprises two outer layers of a brazing alloy bonded to an inner layer or core of iron or nickel. While a wide variety of brazing alloys are useful as the outer layers, a cost preferred alloy is AMS-4764 (in percent by weight 9.5 Ni - 52.5 Cu - 38.0 Mn) having a melting range of 880.degree.-925.degree. C. This is approximately 40% less than the melting temperature of the iron or nickel core which, therefore, is not susceptible to melting and alloying with the outer layers when the brazing furnace temperature fluctuates during the brazing operation. On cooling, the ductile iron or nickel core absorbs stresses due to dissimilar thermal expansion coefficients of the carbide tip and the holder and prevents cracking of the joint. In addition, these ductile cores protect the joint against damage from vibrations and shocks to which mine drills are normally subjected in use.

REFERENCES:
patent: 3395443 (1968-08-01), Polinko, Jr.
patent: 3444613 (1969-05-01), Foerster
patent: 3676088 (1972-07-01), Pryor
Lyman, T. et al.; Metals Handbook, 8th edition, vol. 6, Am. Soc. for Metals, p. 639, (1973).
Aerospace Material Specification, AMS 4764A; Soc. of Automotive Eng., Inc., pp. 1-4, (1978).
Merriman, A. D., A Dictionary of Metallurgy, MacDonald & Evans, Ltd.; London, pp. 193-339.

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