| 摘要 |
PROBLEM TO BE SOLVED: To provide a permanent magnet material of a Mn-Ga-Al ternary alloy having a tetragonal crystal structure and having a high magnetic property with stability.SOLUTION: A method for manufacturing a permanent magnet material comprises the steps of: preparing an alloy ingot having an alloy composition given by the general formula [MnxGayAlz] (where 60≤x≤80 at%, 10≤y≤30 at%, and 10≤z≤30 at%) from raw materials of Mn, Ga and Al in an argon atmosphere by high frequency melting; directing a jet of a molten metal produced by high frequency melting of the alloy ingot in an argon atmosphere at a copper roller rolling at a high speed, thereby quenching and solidifying it; and performing a thermal treatment on the resultant alloy in an argon atmosphere at 600°C for one hour, thereby making the permanent magnet material. The permanent magnet material has a tetragonal crystal structure of Curie temperature 400°C which is different from a conventional AlTi type crystal structure of Curie temperature 489°C. |
