PURPOSE: To obtain a permanent magnet performing stability of tetragonal crystal compound, containing one of rare earth elements and having sufficiently high Curie point instead of an Sm-Co series magnet which contains a large quantity of expensive Co by adding specific amount of Ti to R-Fe series.
CONSTITUTION: A permanent magnet containing one of rare earth elements is obtained by melting, casting, pulverizing, molding in a magnetic field, and sintering, by a powder metallurgical method, a composition represented by a formula (where R is one or more of are earth elements including Y, x is 12≤x≤30%, y is 1≤y≤10%, and z is 0<z≤34% by wt.%) and having in a main phase a body-centered crystal structure. The obtained magnet contains as a main ingredient a compound having a stable crystal structure of body- centered tetragonal ThMn12 structure with Ti, has higher Curie point than that of R2Fe12 compound, largely improves its saturated magnetization, and obtains high magnetic properties.
TAWARA YOSHIO
YOKOYAMA TOSHIICHI
OSUGI MAKOTO
| JPS60144909A | 1985-07-31 | |||
| JPS6328845A | 1988-02-06 |