Patents by Inventor Hayato Hashino
Hayato Hashino has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11328845Abstract: The present invention relates to an RFeB-based magnet in which a treatment (grain boundary diffusion treatment) for diffusing atoms of the heavy rare earth element RH is performed in a base material including an RLFeB-based sintered magnet obtained by subjecting crystal grains in a raw-material powder including a powder of an RLFeB-based alloy containing the light rare earth element RL, Fe and B to orientation in a magnetic field and then sintering the oriented raw-material powder, or an RLFeB-based hot-deformed magnet obtained by subjecting the same raw-material powder to hot pressing and then to hot deforming to thereby orient the crystal grains in the raw-material powder, and a method for producing the RFeB-based magnet.Type: GrantFiled: June 25, 2018Date of Patent: May 10, 2022Assignee: DAIDO STEEL CO., LTD.Inventors: Jumpei Hinata, Hayato Hashino, Fumiya Kitanishi, Kazuya Gomi, Kazumasa Fujimura
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Patent number: 11295880Abstract: The present invention relates to an RFeB-based magnet in which a treatment (grain boundary diffusion treatment) for diffusing atoms of the heavy rare earth element RH is performed in a base material including an RLFeB-based sintered magnet obtained by subjecting crystal grains in a raw-material powder including a powder of an RLFeB-based alloy containing the light rare earth element RL, Fe and B to orientation in a magnetic field and then sintering the oriented raw-material powder, or an RLFeB-based hot-deformed magnet obtained by subjecting the same raw-material powder to hot pressing and then to hot deforming to thereby orient the crystal grains in the raw-material powder, and a method for producing the RFeB-based magnet.Type: GrantFiled: June 25, 2018Date of Patent: April 5, 2022Assignee: DAIDO STEEL CO., LTD.Inventors: Jumpei Hinata, Hayato Hashino, Fumiya Kitanishi, Kazuya Gomi, Kazumasa Fujimura
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Patent number: 10475561Abstract: A method for producing an RFeB system magnet with high coercivity by preventing a coating material from peeling off the surface of a base material during a grain boundary diffusion treatment is provided. A method for producing an RL2Fe14B system magnet which is a sintered magnet or a hot-deformed magnet containing, as the main rare-earth element, a light rare-earth element RL which is at least one of the two elements of Nd and Pr, the method including: applying, to a surface of a base material M of the RL2Fe14B system magnet, a coating material prepared by mixing a silicone grease and an RH-containing powder containing a heavy rare-earth element RH composed of at least one element selected from the group of Dy, Tb and Ho; and heating the base material together with the coating material. Improved coating and base materials adhesion facilitates transfer of RH into base material grain boundaries.Type: GrantFiled: March 13, 2014Date of Patent: November 12, 2019Assignees: INTERMETALLICS CO., LTD., DAIDO STEEL CO., LTD.Inventors: Masato Sagawa, Shinobu Takagi, Hayato Hashino
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Publication number: 20180374617Abstract: The present invention relates to an RFeB-based magnet in which a treatment (grain boundary diffusion treatment) for diffusing atoms of the heavy rare earth element RH is performed in a base material including an RLFeB-based sintered magnet obtained by subjecting crystal grains in a raw-material powder including a powder of an RLFeB-based alloy containing the light rare earth element RL, Fe and B to orientation in a magnetic field and then sintering the oriented raw-material powder, or an RLFeB-based hot-deformed magnet obtained by subjecting the same raw-material powder to hot pressing and then to hot deforming to thereby orient the crystal grains in the raw-material powder, and a method for producing the RFeB-based magnet.Type: ApplicationFiled: June 25, 2018Publication date: December 27, 2018Inventors: Jumpei HINATA, Hayato Hashino, Fumiya Kitanishi, Kazuya Gomi, Kazumasa Fujimura
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Publication number: 20160300649Abstract: A method for producing an RFeB system magnet with high coercivity by preventing a coating material from peeling off the surface of a base material during a grain boundary diffusion treatment is provided. A method for producing an RL2Fe14B system magnet which is a sintered magnet or a hot-deformed magnet containing, as the main rare-earth element, a light rare-earth element RL which is at least one of the two elements of Nd and Pr, the method including: applying, to a surface of a base material M of the RL2Fe14B system magnet, a coating material prepared by mixing a silicone grease and an RH-containing powder containing a heavy rare-earth element RH composed of at least one element selected from the group of Dy, Tb and Ho; and heating the base material together with the coating material. Improved coating and base materials adhesion facilitates transfer of RH into base material grain boundaries.Type: ApplicationFiled: March 13, 2014Publication date: October 13, 2016Inventors: Masato SAGAWA, Shinobu TAKAGI, Hayato HASHINO
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Patent number: 9324485Abstract: A material for anisotropic magnet, comprising, (1) a Pr-T-B—Ga-based composition containing Pr: 12.5 to 15.0 atomic percent, B: 4.5 to 6.5 atomic percent, Ga: 0.1 to 0.7 atomic percent, and the balance of T and inevitable impurities, wherein T is Fe or obtained by substituting Co for a portion of the Fe; and having, (2) a degree of magnetic alignment of 0.92 or more, wherein the degree of magnetic alignment is defined by remanence (Br)/saturation magnetization (Js); and (3) a crystal grain diameter of 1 ?m or less.Type: GrantFiled: January 6, 2010Date of Patent: April 26, 2016Assignee: DAIDO STEEL CO., LTD.Inventors: Keiko Hioki, Takao Yabumi, Hayato Hashino
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Patent number: 9281106Abstract: A material for anisotropic magnet, comprising, (1) a Pr-T-B—Ga-based composition containing Pr: 12.5 to 15.0 atomic percent, B: 4.5 to 6.5 atomic percent, Ga: 0.1 to 0.7 atomic percent, and the balance of T and inevitable impurities, wherein T is Fe or obtained by substituting Co for a portion of the Fe; and having, (2) a degree of magnetic alignment of 0.92 or more, wherein the degree of magnetic alignment is defined by remanence (Br)/saturation magnetization (Js); and (3) a crystal grain diameter of 1 ?m or less.Type: GrantFiled: January 6, 2010Date of Patent: March 8, 2016Assignee: DAIDO STEEL CO., LTD.Inventors: Keiko Hioki, Takao Yabumi, Hayato Hashino
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Patent number: 8002906Abstract: The present invention provides a rare earth magnet, which is formed through at least hot molding, the rare earth magnet containing grains including an R2X14B phase as a main phase, and a grain boundary phase surrounding peripheries of the grains, in which R is at least one element selected from the group consisting of Nd, Pr, Dy, Tb and Ho, and X is Fe or Fe with a part being substituted by Co; in which an element RH is more concentrated in the grain boundary phase than in the grains, in which the element RH is at least one element selected from the group consisting of Dy, Tb and Ho; and the element RH is present with a substantially constant concentration distribution from the surface part of the magnet to the central part of the magnet.Type: GrantFiled: June 30, 2009Date of Patent: August 23, 2011Assignee: Daido Tokushuko Kabushiki KaishaInventors: Shunji Suzuki, Hayato Hashino, Masahiro Hiraoka, Takao Yabumi
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Publication number: 20100172783Abstract: A material for anisotropic magnet, comprising, (1) a Pr-T-B—Ga-based composition containing Pr: 12.5 to 15.0 atomic percent, B: 4.5 to 6.5 atomic percent, Ga: 0.1 to 0.7 atomic percent, and the balance of T and inevitable impurities, wherein T is Fe or obtained by substituting Co for a portion of the Fe; and having, (2) a degree of magnetic alignment of 0.92 or more, wherein the degree of magnetic alignment is defined by remanence (Br)/saturation magnetization (Js); and (3) a crystal grain diameter of 1 ?m or less.Type: ApplicationFiled: January 6, 2010Publication date: July 8, 2010Applicant: DAIDO STEEL CO., LTD.Inventors: Keiko HIOKI, Takao YABUMI, Hayato HASHINO
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Publication number: 20100003156Abstract: The present invention provides a rare earth magnet, which is formed through at least hot molding, the rare earth magnet containing grains including an R2X14B phase as a main phase, and a grain boundary phase surrounding peripheries of the grains, in which R is at least one element selected from the group consisting of Nd, Pr, Dy, Tb and Ho, and X is Fe or Fe with a part being substituted by Co; in which an element RH is more concentrated in the grain boundary phase than in the grains, in which the element RH is at least one element selected from the group consisting of Dy, Tb and Ho; and the element RH is present with a substantially constant concentration distribution from the surface part of the magnet to the central part of the magnet.Type: ApplicationFiled: June 30, 2009Publication date: January 7, 2010Applicant: DAIDO TOKUSHUKO KABUSHIKI KAISHAInventors: Shunji SUZUKI, Hayato HASHINO, Masahiro HIRAOKA, Takao YABUMI
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Publication number: 20090218012Abstract: A material for magnetic anisotropic magnet, comprising (1) a Pr-T-B—Ga-based composition containing Pr: 13.0 to 15.0 atomic percent, B: 4.5 to 6.5 atomic percent, Ga: 0.1 to 0.7 atomic percent, and the balance of. T and inevitable impurities, wherein T is obtained by substituting Co for Fe or a portion of Fe, (2) the material for magnetic anisotropic magnet is obtained by rapidly-cooling a molten alloy having the composition, pulverizing the ribbon obtained by the rapid-cooling, cold-forming the alloy powder obtained by the pulverizing, hot-forming the cold-formed body, and performing hot plastic working to the hot-formed body, and (3) the degree of magnetic orientation of the material for magnetic anisotropic magnet, which is defined by remanence (Br)/saturation magnetic flux density (Js), is 0.9 or more.Type: ApplicationFiled: February 25, 2009Publication date: September 3, 2009Applicant: DAIDO STEEL CO., LTDInventors: Keiko HIOKI, Takao YABUMI, Hayato HASHINO
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Publication number: 20090081071Abstract: A rare earth permanent magnet alloy with a high coercive force is disclosed. The rare earth permanent magnet alloy comprises: a rare earth-iron-boron type magnetic phase (R2Fe14B type magnetic phase) constituting a parent phase; and a defect structure. The parent phase contains the defect structure. Displacement of magnetic domain wall of the R2Fe14B type magnetic phase is prevented by the defect structure, thereby improving coercive force.Type: ApplicationFiled: September 9, 2008Publication date: March 26, 2009Inventors: Hiroshi YAMAMOTO, Tetsurou Tayu, Masashi Ohmura, Keizou Otani, Takao Yabumi, Hayato Hashino