Development of manufacturing method of permanent magnet wires by using in-rotating liquid spinning process

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We mainly investigated NdFeB alloy wires again and newly tried to produce a MnBi permanent magnet wire, which does not include ferromagnetic elements. In this study, we controlled the coolant temperature as lower as possible and the rotational speed of dram. Also we examined possibility to inhibit crystal growth process by adding the 4th element. We successfully produced a NdFeB wire when the revolution speed of dram was 6.8-7.3 m/s at 3 degrees of the coolant temperature. However its coercive force was around 500 Oe. We also selected Ti (2-6wt%) as the 4th element and the coercive force was improved about 1.3 times, however the coercive force after heat-treatment (650 degrees for 1 hour) had not reached our object value.As for the MnBi permanent magnet wire, we made a ribbon firstly. The coercive force of the ribbon was over 5 kOe, which was in good agreement with references. The produced MnBi wire was very fragile and the magnetic property was soft.