Method for producing cast alloy and magnet

A method for producing a magnet, comprising:

• crushing and pulyerizing a cast alloy into powder;
• compacting the powder under a magnetic field;
• and
• sintering the compacted power,
• wherein the cast alloy is obtained by:
• feeding a melt onto a rotary casting roll, the melt comprising from 27 to 34% by weight of at least one element selected from the group consisting of the rare earth elements (R) and yttrium, from 0.7 to 1.4% by weight of boron, with the balance being essentially iron, and optionally other transition elements;
• cooling the melt in a temperature range of from melting point to 1000.degree. C. at a cooling rate of 300.degree. C. per second or more;
• and
• further cooling in a temperature range of from 800.degree. C. to 600.degree. C. at a cooling rate of 0.80.degree. C./second or less.

A method for producing a magnet, comprising:

• crushing and pulyerizing a cast alloy into a first powder;
• mixing the first powder with a second powder which contains mainly iron and rare earth elements in an amount greater than the first powder;
• compacting the powder mixture under magnetic field;
• and then
• sintering the compacted powder mixture;
• wherein the cast alloy is obtained by:
• feeding a melt onto a rotary casting roll, the melt comprising from 27 to 34% by weight of at least one element selected from the group consisting of the rare earth elements (R) and yttrium, from 0.7 to 1.4% by weight of boron, with the balance being essentially iron, and optionally other transition elements;
• cooling the melt in a temperature range of from melting point to 1000.degree. C. at a cooling rate of 300.degree. C. per second or more;
• and
• further cooling in a temperature range of from 800.degree. C. to 600.degree. C. at a cooling rate of 1.degree. C./second or less.