METALLIC POWDER AND ITS PRODUCTION AS WELL AS METALLIC MOLDING FORMED BY USING THIS METALLIC POWDER AND PRODUCTION OF METALLIC HONEYCOMB MONOLITH

摘要

PURPOSE: To produce the metallic powder which is spherical or lumpy and is adequate as the raw material for the metallic honeycomb monolith by pulverizing a molten metal by a water atomization method, then subjecting the powder to a jet mill treatment. ;CONSTITUTION: The molten metal of an alloy consisting essentially of Fe, Cr, Al or an Ni-base alloy is pulverized by the water atomization method, by which the alloy is pulverized to a powder form of irregular shapes. This alloy powder is subjected to the jet mill treatment and is thereby made into the lumpy or spherical shape having 1.0 to 6.0 degree of lumpiness defined by the ratio between the specific surface are determined by a BET method and the estimated specific surface area expressed by equation I, 50μm max. diameter d_max, 5 to 30μm 90wt.% diameter d₉₀, and 3 to 10μm 50wt.% diameter d₅₀. Water and org. binder are mixed with this alloy powder and the mixture is extrusion molded to a monolithic form having a small wall thickness. After the molding is dried, the molding is sintered in a gaseous hydrogen atmosphere, by which the metallic honeycomb monolith having excellent high-temp. oxidation resistance and corrosion resistance without generating molding defects and deformation by calcination is produced.;COPYRIGHT: (C)1993,JPO&Japio