PRODUCTION METHOD OF POWDER MIXTURE FOR PRODUCTION OF PARTICULATE SINTERED HARD ALLOY ANDPARTICULATE SINTERED HARD ALLOY OBTAINED BY THE PRODUCTIN METHOD

摘要

PROBLEM TO BE SOLVED: To provide a production method of a powder mixture for production of a particulate sintered hard alloy, wherein contamination with constituents etc., of the inner walls of the apparatus is hardly caused.;SOLUTION: The production method of the powder mixture for production of the particulate sintered hard alloy comprises: a first process of obtaining a slurry composed of a powder mixture containing at least 2 to 15mass% Co powder based on the total amount of the powder for the particulate sintered hard alloy as a solute and the balance WC powder of 0.1 to 0.9 μm in average grain size and inevitable impurities, and a solvent; a second process in which the slurry is branched to at least two or more on the upstream side of a flow passage when the slurry is conveyed in the flow passage by applying pressurization energy thereto; a third process in which each flow passage branched to the two or more has an opening reduced in its inside diameter and the openings are arranged to counter each other and the slurries are brought into collision so as to intersect each other at least at about one point and are thus mixed and pulverized; and a fourth process of recovering and drying the slurry after the collision.;COPYRIGHT: (C)2007,JPO&INPIT