CEMENTED CARBIDE MATERIAL COMBINED WITH DIFFERENT COMPOSITIONS AND ITS PRODUCTION AND SPIKE MADE OF CEMENTED CARBIDE MATERIAL COMBINED WITH DIFFERENT COMPOSITIONS

摘要

PURPOSE: To produce the cemented carbide material combined with different compsns. having high hardness and high toughness in combination by successively packing cemented carbide powder consisting of a high-hardness compsn. and cemented carbide powder consisting of a high-toughness compsn. into a metallic mold, forming a cemented carbide powder mixture layer therebetween, compression molding the powders and sintering the molding. ;CONSTITUTION: A desired ant. of the cemented carbide powder 1 consisting of the relatively high-hardness compsn. is injected from a feeder 6 into the metallic mold 5 and a lower punch 8 is lowered to pack the powder into the lower half part of the mold 5. Further, a desired amt. of the cemented carbide powder 2 consisting of the relatively high-toughness compsn. is injected from an other feeder 7 into the metallic mold and packed therein to form the cemented carbide powder mixture layer 3 in the boundary part between both powders 1 and 2. The powders are then uniformly compression molded by a lower punch 8 and the upper punch 9 to form a series of the high-density compressed body 10a of the different compsns. consisting of respective high-density compressed bodies 1a, 3a, 2a. Further, the compressed bodies are sintered in a sintering furnace and are integrally molded to a series of the composite sintered compact 10b of sintered hard alloys consisting of the respective sintered compacts 1b, 3b, 2b of the cemented carbide. The cemented carbide combined with the different compsns. is thus obtd.;COPYRIGHT: (C)1994,JPO