Tungsten carbide-containing hard alloy that may be processed by

Details Tungsten carbide-containing hard alloy that may be processed by Tungsten carbide-containing hard alloy that may be processed by

1990-04-24

1991-07-09

Morris, Theodore

Stock material or miscellaneous articles

All metal or with adjacent metals

Laterally noncoextensive components

420 64, 420129, 420583, 420590, C22C 100, C22C 3200

Patent

active

050305190

ABSTRACT:
A matrix-bonded carbide-containing material of high hardness is prepared using a mixture containing a matrix alloy having a composition in weight percent of from about 15 to about 45 percent chromium, from 0 to about 3 percent silicon, from about 2 to about 6 percent boron, from about 3 to about 11 percent titanium (either as metal or as a compound), balance iron and impurities, and a mass of tungsten carbide particles, the tungsten carbide particles preferably being present in an amount of from about 15 to about 60 percent by weight of the total mixture and the matrix alloy preferably being present in an amount of from about 85 to about 40 percent by weight of the total mixture. The matrix alloy is melted to produce a flowable mixture having a liquid phase and solid tungsten carbide particles, and thereafter solidified. During melting, the tungsten carbide particle size is reduced by interaction with the liquid phase. The melting can be accomplished by a conventional melt casting procedure, or by welding or other technique that produces a liquid matrix phase. The fine tungsten carbide particles produced during melting exhibit little if any settling, so that the final solidified product is macroscopically homogeneous.

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