Patent ID: 8025710
Filing Date: 2011-09-27
Classification: B22F,B24B,C09K,C22C,Y10T

Abstract:
1. A method for manufacturing tungsten alloy grains, the method comprising steps of: blending a tungsten powder, a nickel powder, and at least one kind of a powder selected from the group consisting of an iron powder, a copper powder, and a cobalt powder; granulating the blended powder obtained at the blending step by adding an organic binder to the blended powder; spheroidizing the granulated powder obtained at the granulating step by stirring the granulated powder to obtain a softened granulated powder at a temperature greater than or equal to a softening point of the organic binder and thereafter, cooling the powder; and sintering the granulated powder which has been subjected to the spheroidizing to obtain the tungsten alloy grains, wherein the tungsten alloy grains obtained have a maximum diameter greater than or equal to 0.1 mm and less than or equal to 5.0 mm and a specific surface area less than or equal to 0.02 m