Patent ID: 9162928
Filing Date: 2015-10-20
Classification: C01G,C01P,C04B,H01F

Abstract:
1. A method for producing a sintered ferrite magnet comprising (a) a ferrite phase having a hexagonal M-type magnetoplumbite structure, and (b) a grain boundary phase indispensably containing Si, said method comprising a step of preparing calcined ferrite containing a ferrite phase having a hexagonal M-type magnetoplumbite structure, which comprises Ca, an element R which is at least one of rare earth elements and indispensably includes La, an element A which is Ba and/or Sr, Fe, and Co as indispensable elements, the composition of metal elements of Ca, R, A, Fe and Co being represented by the general formula of Ca 0.42≦(1-x-y)≦0.5, 0.45≦x≦0.55, 0≦y≦0.8, 0.2≦z≦0.3, and 4.8≦n≦5.2; a step of pulverizing said calcined body to powder; a step of molding said powder to a green body; and a step of sintering said green body to obtain a sintered body; more than 1% by mass and 1.8% or less by mass of SiO