Abstract
The Fe-Al-C permanent-magnet alloy —the MT Magnet steel— is well adapted to a country like Japan limited in natural resources. As this alloy owns coercive force of more than 200 Oe, it can be applied to such equipments as watt-hour meter, hysteresis or small DC motors in place of Co or Cr magnet steel. The results of fundamental researches on MT magnet were already reported in the author’s previous papers. Accordingly, this report covers a part of later experiments conducted in the course of industrialization. In melting procedure, it is necessary to take care of segregation and oxidation of the alloying Al. In view of yielding rate of magnetic properties and heat treatment, it was discovered that the most appropriate composition of MT magnet was within the region of 8.15±0.25%Al and 1.99±0.03%C. Addition of Si is harmful for magnetic properties and Si must be kept below 0.20%. Casting has been made in green sand. The design of the pattern, the “as-cast” tolerance and the defects in casting were reexamined in the light of daily practices.
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