Industry new
Soft magnetic alloy powder manufacturing method
It is characterized in that its process steps include: smelting of soft magnetic master alloy, rapid solidification of molten metal into a crystalline sheet alloy, flaking of alloy flakes into alloy powder, activation annealing of alloy powder and passivation of alloy powder: (1) The soft magnetic alloy smelting soft magnetic master alloy smelting is carried out by using any of the intermediate frequency electromagnetic induction melting furnace, resistance heating smelting furnace, plasma smelting furnace or arc smelting furnace for smelting, and the smelting atmosphere is non-vacuum or vacuum or non-oxidizing atmosphere; (2) Rapid solidification of a molten metal into a crystalline sheet-shaped alloy A molten body of a soft magnetic master alloy melted in a smelting furnace is continuously cast on a surface of a rotating metal cooling roll, so that a soft magnetic mother alloy melt is rapidly solidified into a crystalline sheet. Alloy
(3) The sheet alloy is broken into soft magnetic alloys and the rapidly solidified sheet alloy is broken into alloy powders on a grinding machine;
(4) Activation of the alloy powder by annealing treatment The alloy powder after crushing is subjected to activation annealing in a non-oxidizing atmosphere or a reducing atmosphere in a heat treatment furnace at a treatment temperature of 400 to 800° C. and a treatment time of 0.5 to 6 hours.
(5) Passivation of alloy powder: The activated annealing alloy powder is mixed with a previously formulated passivating product and allowed to stand for 0.5 to 4 hours before being dried. After drying, it becomes the softness of the present invention. Magnetic alloy powder.
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