PURPOSE: To provide a magnet which allows high coercive force and stability by holding particles in nonaqueous solvent or non-oxidizing atmosphere during a finely powdering process, a coating process and the process between such processes.
CONSTITUTION: Magnet constituted of the following is manufactured; 5-15atom% of R (R is an element of one or more kinds selected from rare earth elements and that contains Sm as an essential element.), 0.5-25atom% of N and T (T is Fe or Fe and Co.). The method has roughly powdering process which roughly powders mother alloy which contains the R and T so as to provide alloy particles, nitriding process which finely powders nitride particles so as to provide magnetic grains and coating process with forms non-magnetic coat on the surface of the magnet grains. The finely powdering process and the coating process are continually performed in nonaqueous solvent. Thus, magnetic particles which allow high coercive force and low coercive force deterioration in the lapse of time are provided.
ISHIZAKA TSUTOMU
YONEYAMA TETSUTO
