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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Radially anisotropic Sm_2Fe_(17)N_3/Nd_2Fe_(14)B hybrid bonded-magnets using self-organization technique
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Radially anisotropic Sm_2Fe_(17)N_3/Nd_2Fe_(14)B hybrid bonded-magnets using self-organization technique

机译：利用自组织技术的径向各向异性Sm_2Fe_（17）N_3 / Nd_2Fe_（14）B混合粘结磁体

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It has been well accepted that magnetic properties of radially anisotropic ring-shaped bonded-magnets are deteriorated when magnetic field for alignment is limited due to miniaturization. In order to overcome this difficulty, we developed a new technique using self-organization of binder, which enabled the alignment of molecular chain. Furthermore, we achieved the low pressure compacting such as 20 MPa for green compacts by using slip-flow phenomenon. By using these techniques, we made Sm_2Fe_(17)N_3/Nd_2Fe_(14)B rigid void-less sheet magnets with the relative density higher than 98 percent , controlled their flexibility, transformed them into various shapes, and succeeded in preparing radially anisotropic bonded-magnets. One of examples is a radially anisotropic ring-shaped bonded-magnet which is approximately from 0.35 to 1.0 mm in thickness and less than 15 mm in outer diameter. It could be prepared by rolling a sheet-shaped rigid bonded-magnet with the rolling rate from approximately 3 to 5 percent at 100-120 deg C and curling it. Superior magnetic properties were realized by optimizations of the solidification process of the compound with self-organization of binder under an axially alignment-field and the transformation process into various specific shapes. An obtained (BH)_(max) value exceeded 140 kJ/m~3, even if their- thickness is less than 1 mm and the outer diameter is less than 15 mm. Furthermore, the compaction at a low pressure suppresses destruction and cracks of HDDR-Nd_2Fe_(14)B powder, which improved the squareness of the demagnetization curve and the initial flux loss at elevated temperatures such as 100 deg C.
机译：众所周知，当由于小型化而使取向用磁场受到限制时，径向各向异性环状粘结磁铁的磁特性降低。为了克服这一困难，我们开发了一种使用粘合剂自组织的新技术，该技术能够使分子链对齐。此外，我们通过利用滑流现象实现了生坯的低压压实，例如20 MPa。通过这些技术，我们制成了相对密度高于98％的Sm_2Fe_（17）N_3 / Nd_2Fe_（14）B刚性无空隙薄板磁体，控制了它们的柔韧性，将它们转变为各种形状，并成功地制备了径向各向异性粘结-磁铁。示例之一是径向各向异性的环形粘结磁体，其厚度大约为0.35至1.0 mm，而外径小于15 mm。可以通过在100-120摄氏度下以约3-5％的轧制率轧制片状刚性粘结磁体并将其卷曲来制备。通过优化在轴向排列场下具有粘合剂自组织的化合物的固化过程以及将其转变为各种特定形状的过程，可以实现卓越的磁性能。即使其厚度小于1 mm，外径小于15 mm，所获得的（BH）_（max）值也超过140 kJ / m〜3。此外，在低压下的压制抑制了HDDR-Nd_2Fe_（14）B粉末的破坏和开裂，从而改善了退磁曲线的矩形性以及在高温（例如100摄氏度）下的初始磁通损耗。

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