MANUFACTURING METHOD OF RARE EARTH MAGNET PRECURSOR OR RARE EARTH MAGNET MOLDED BODY HAVING ROUGHENED STRUCTURE ON SURFACE

• Main Authors: UNO TAKAYUKI, ITAKURA MASAHIKO, WADA NORIKAZU, SHIMIZU KIYOSHI
• Format: Patent
• Language: English; Japanese
• Published: 04.01.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INDUCTANCES; MAGNETS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

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 【課題】表面に粗面化構造を有する希土類磁石前駆体の製造方法の提供。【解決手段】希土類磁石前駆体の粗面化構造を有する面に（ａ）Saが5〜300μｍ、（ｂ）Szが50〜1500μｍ、（ｃ）Sdrが0.3〜12の要件の少なくとも一つを満たす凹凸が形成されているものであり、希土類磁石前駆体の原料成形体の表面に対して要件（ｉ）〜（ｖ）を満たすようにパルス波レーザー光を照射して粗面化構造を形成する工程を有している、希土類磁石前駆体の製造方法。（i）レーザー光を照射するときの照射角度が15〜90度（ii）レーザー光を照射するときの照射速度が10〜1000mm/sec（iii）レーザー光を照射するときのエネルギー密度が0.1〜50GW/cm2（iv）レーザー光を照射するときの繰り返し回数が1〜80回（v）レーザー光を照射するときのピッチ間隔が0.01〜1mm【選択図】なし