| 简介 |
To provide a manufacturing method of a rare earth magnet precursor having a roughened structure on the surface.SOLUTION : A manufacturing method of a rare earth magnet precursor includes a step of forming unevenness that meets at least one of the requirements in which (a) Sa is 5 to 300 μm, (b) Sz is 50 to 1500 μm, and (c) Sdr is 0.3 to 12 on the surface having a roughened structure of a rare earth magnet precursor, and irradiating the surface of a raw material molded body of the rare earth magnet precursor with pulse wave laser light such that the requirements (i) to (v) are satisfied to form the roughened structure. (i) The irradiation angle when irradiating with laser light is 15 to 90 degrees, (ii) the irradiation speed when irradiating with laser light is 10 to 1000 mm/sec, (iii) the energy density when irradiating with laser light is 0.1 to 50GW/cm2, (iv) the number of repetitions when irradiating with laser light is 1 to 80 times, and (v) the pitch interval when irradiating with laser light is 0.01 to 1 mm.SELECTED DRAWING : None |
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