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AssigneeIowa State University Research Foundation, Inc.
InventorsJun Cui, Ryan T. Ott, Wei Tang, Xubo Liu, Cajetan Ikenna Nlebedim, Gaoyuan Ouyang, Chaochao Pan
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A method for fabrication of an anisotropic magnet comprises placing magnet alloy feedstock particles in a deformable metallic container and thermomechanically working the filled container in a manner to elongate the filled container and reduce its cross-sectional area to consolidate the magnet alloy particles to an elongated shape and impart a preferential grain texture to the consolidated, elongated shape. The consolidated, elongated shape is machined to a near-final magnet shape that has a smaller dimension such as magnet length and that includes a metallic tubular skin thereon.
A method for fabrication of an anisotropic magnet shape, comprising filling magnet alloy feedstock particles having a grain size of 10 to 1000 nm in a metallic container and subjecting the particle filled container to more than three successive hot rolling passes wherein the particle filled container is heated between each succeeding hot rolling pass to a hot rolling temperature and hot rolled in contact with at least one roller that is at a lower temperature than the hot rolling temperature to achieve a partial reduction in thickness by each hot rolling pass of the heated particle filled container with roller-contact-cooling thereof before each next hot rolling pass, wherein the hot rolling passes, in aggregate, elongate the particle filled container and reduce its cross-sectional area to consolidate the magnet alloy particles to a consolidated elongated precursor magnet strip shape and impart a preferential grain texture thereto having an easy-magnetization axis in a direction normal to a major planar surface of the strip shape along its length with a metallic skin comprising hot rolled container metallic material thereon;
A method for fabrication of an anisotropic magnet shape, comprising filling magnet alloy feedstock particles having a grain size of 20 to 30 nm in a metallic container and subjecting the particle filled container to successive hot rolling passes wherein the particle filled container is induction heated to a hot rolling temperature between each succeeding hot rolling pass and hot rolled in contact with at least one relatively cold roller that is at room temperature to achieve a partial reduction in thickness less than 30% by each hot rolling pass of the particle filled container with roller-contact-cooling thereof before a next hot rolling pass, wherein the hot rolling passes, in aggregate, elongate the particle filled container and reduce its cross-sectional area to consolidate the magnet alloy particles to a consolidated elongated precursor magnet strip shape having a preferential c-axis grain texture imparted thereto in a direction normal to a major planar surface of the strip shape along its length and with a metallic skin comprising hot rolled container metallic material present thereon;
A method for fabrication of an anisotropic magnet shape, comprising filling magnet alloy feedstock particles having a grain size of 10 to 1000 nm in a metallic container and subjecting the particle filled container to successive hot rolling passes wherein the particle filled container is heated between each succeeding hot rolling pass to a hot rolling temperature and hot rolled in contact with at least one roller that is at a lower temperature than the hot rolling temperature to achieve a partial reduction in thickness by each hot rolling pass of the heated particle filled container with roller-contact-cooling thereof before each next hot rolling pass, wherein the hot rolling passes, in aggregate, elongate the particle filled container and reduce its cross-sectional area to consolidate the magnet alloy particles to a consolidated elongated precursor magnet strip shape and impart a preferential grain texture thereto having an easy-magnetization axis in a direction normal to a major planar surface of the strip shape along its length with a metallic skin comprising hot rolled container metallic material present thereon;
Dependencies are inferred from the claim text.