Patent ID: 7214343
Filing Date: 2007-05-08
Classification: B22F,C22C,H01F

Abstract:
1. A method for producing a granulated powder of an R—Fe—B alloy, comprising the steps of: preparing an R—Fe—B alloy powder; and granulating a mixture consisting of the alloy powder and at least one kind of granulating agent selected from a group consisting of normal paraffins, isoparaffins and depolymerized oligomers and optionally a terpene resin or an aliphatic resin to prepare a granulated powder; wherein the at least one kind of granulating agent is added in the step of granulating in an amount of 0.1 mass% to 50 mass% with respect to the mass of the granulated powder; wherein the mean particle size of the alloy powder is in the range of 1.5 μm to 5 μm; wherein the mean molecular weight of the at least one kind of granulating agent is in the range of 120 to 500; and wherein the granulated powder is prepared by a fluidized bed granulation process.