C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
75/159, 75/33, 2
C04B 35/36 (2006.01) C22C 1/10 (2006.01) C22C 29/02 (2006.01) C22C 29/06 (2006.01) C22C 29/10 (2006.01)
Patent
CA 1075722
ABSTRACT OF THE DISCLOSURE A hard sintered carbide composition and the method of making such composition for use as a cutting material or for use as wear parts or dies and the like, is disclosed. The composition consists essentially of a titanium carbide phase bound together by a binding alloy principally composed of molybdenum and nickel; the titanium carbide contains controlled amounts of dissolved vanadium carbide and/or titanium nitride. The binding alloy is characterized by the addition of aluminum in controlled amounts and chromium may be added to the binding alloy as a partial substitute for some of the aluminum. The presence of the dissolved vanadium carbide and/or titanium nitride produces a grain refinement in the carbide phase and the presence of the aluminum tends to form a nickel aluminide in the binding alloy which is of a finely divided character. The presence of two or more of the elements: vanadium carbide, titanium nitride and aluminum produce an unprecedented improvement in the defor- mation resistance of a TiC-Ni-Mo composition. The method requires that the binding alloy powder and the carbide powders be selected as to size (about 3-4 microns) be milled with the additive powders and the compac- ted charge then be sintered at about 1400°C in closed graphite trays in a furnace evacuated to less than 1 micron of mercury pressure.
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