[특허]Permanent magnet including multiple ferromagnetic phases and method for producing the magnet

Permanent magnet including multiple ferromagnetic phases and method for producing the magnet 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01F-001/057 H01F-001/032 H01F-001/058
출원번호	US-0745834 (2003-12-24)
등록번호	US-7297213 (2007-11-20)
우선권정보	JP-2000-152234(2000-05-24); JP-2000-201999(2000-07-04); JP-2000-224519(2000-07-25); JP-2000-291485(2000-09-26)
발명자 / 주소	Kanekiyo,Hirokazu Miyoshi,Toshio Hirosawa,Satoshi Shigemoto,Yasutaka Shioya,Yusuke
출원인 / 주소	Neomax Co., Ltd.
대리인 / 주소	Keating & Bennett, LLP
인용정보	피인용 횟수 : 0 인용 특허 : 43

초록 ▼

An iron-based rare earth alloy magnet has a composition represented by the general formula: (Fe1-mTm)100-x-y-zQxRyMz , where T is at least one element selected from the group consisting of Co and Ni; Q is at least one element selected from the group consisting of B and C; R is at least one rare earth element substantially excluding La and Ce; and M is at least one metal element selected from the group consisting of Ti, Zr and Hf and always includes Ti. In this formula, the mole fractions x, y, z and m meet the inequalities of: 10 at %

대표청구항 ▼

What is claimed is: 1. A method for producing an iron-based rare earth alloy nanocomposite magnet including a hard magnetic phase and a soft magnetic phase, comprising the steps of: preparing a melt of a material alloy, the material alloy having a composition represented by the general formula: (Fe1-mTm)100-x-y-zQxRyMz , where T is at least one element selected from the group consisting of Co and Ni; Q is at least one element selected from the group consisting of B and C; R is at least one rare earth element substantially excluding La and Ce; and M is at least one metal element selected from the group consisting of Ti, Zr and Hf and always includes Ti, the mole fractions x, y, z and m meeting the inequalities of: 10 at %2Fe14B crystalline phase by: bringing the melt into contact with the surface of a rotating chill roller to obtain a supercooled liquid alloy; and dissipating heat from the supercooled alloy into the ambient gas to grow the R2Fe14B phase after the supercooled alloy has left the chill roller; and thermally treating the rapidly solidified alloy to form a structure in which two or more ferromagnetic crystalline phases, including the hard and the soft magnetic phases, exist, an average grain size of the hard magnetic phase is equal to or greater than 10 nm and equal to or less than 200 nm, and an average grain size of the soft magnetic phase is equal to or greater than 1 nm and equal to or less than 100 nm. 2. The method of claim 1, wherein said rapidly solidified alloy made in the cooling step includes an R2Fe14B phase at 60 volume percent or more. 3. The method of claim 1, wherein said cooling step comprises rapidly cooling the melt within an ambient gas at a pressure of 30 kPa or more to make a rapidly solidified alloy including an R2Fe14B phase with an average grain size of 50 nm or less. 4. The method of claim 1, comprising the step of forming a structure in which three or more crystalline phases, including at least R2Fe14B compound, α-Fe and boride phases are included an average crystal grain size of the R2Fe14B phase is between 20 nm and 150 nm, and an average crystal grain size of the α-Fe and boride phases is between 1 nm and 50 nm. 5. The method of claim 4, wherein said steps of heating and crystallizing the rapidly solidified alloy produces a boride phase comprising an iron-based boride with ferromagnetic properties. 6. The method of claim 5, wherein said steps of heating and crystallizing the rapidly solidified alloy produces a boride phase comprising an iron-based boride comprises Fe3B and/or Fe23B6. 7. The method of claim 1, wherein said step of cooling the melt is effected via a strip casting process. 8. A method for producing a bonded magnet, the method comprising the steps of: preparing a powder of the iron-based rare earth alloy magnet by the method as recited in claim 1; and processing the powder into a bonded magnet.

이 특허에 인용된 특허 (43)

Sellers Charles H. ; Branagan Daniel J. ; Hyde Timothy A., Atomization methods for forming magnet powders.
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O\Handley Robert C. (Andover MA) Grant Nicholas J. (Winchester MA) Hara Yutaka (Tokyo CA JPX) Lavernia Enrique J. (Tustin CA) Harada Tetsuji (Ageo MA JPX) Ando Teiichi (Watertown MA), Bulk rapidly solifidied magnetic materials.
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Arai, Akira; Kato, Hiroshi, Cooling roll, ribbon-shaped magnetic materials, magnetic powders and bonded magnets.
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Inoue Akihisa,JPX ; Fujita Kouichi,JPX ; Fujita Katsuhiro,JPX, Fe based hard magnetic alloy having super-cooled liquid region.
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Croat John J. (Sterling Heights MI), High energy product rare earth-iron magnet alloys.
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Wen Cheng Chang TW; Bao-Min Ma ; Qun Chen ; Charles O. Bounds, High performance iron-rare earth-boron-refractory-cobalt nanocomposite.
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Kanekiyo, Hirokazu; Kitayama, Hirokazu; Hirosawa, Satoshi; Miyoshi, Toshio, Iron base rare earth alloy powder and compound comprising iron base rare earth alloy powder and permanent magnet using the same.
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Hirokazu Kanekiyo JP, Iron-base alloy permanent magnet powder and method for producing the same.
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Ma Bao-Min ; Bounds Charles O. ; Chang Wen Cheng,TWX ; Chen Qun, Iron-rare earth-boron-refractory metal magnetic nanocomposites.
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Panchanathan Viswanathan ; Green William Ray ; Young Kevin Allen, Isotropic rare earth material of high intrinsic induction.
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De Mooij Dirk B. (Eindhoven NLX) Buschow Kurt H. J. (Eindhoven NLX), Magnetic material comprising iron, boron and a rare earth metal.
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Sagawa Masato (Nagaokakyo JPX) Fujimura Setsuo (Kyoto JPX) Matsuura Yutaka (Ibaraki JPX), Magnetic materials and permanent magnets.
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Arai, Akira; Kato, Hiroshi, Magnetic powder and isotropic bonded magnet.
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Narasimhan Kalatur S. V. L. (Monroeville PA) Dulis Edward J. (Pittsburgh PA), Method for making rare-earth element containing permanent magnets.
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Yasutaka Shigemoto JP; Satoshi Hirosawa JP; Hirokazu Kanekiyo JP, Method for preparing nanocomposite magnet powder and method for producing nanocomposite magnet.
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Fukuno Akira (Chiba JPX) Nakamura Hideki (Narita JPX) Yoneyama Tetsuhito (Narashino JPX), Method for preparing permanent magnet material, chill roll, permanent magnet material, and permanent magnet material pow.
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Willman Carol J. (Bethel Park PA) Dulis Edward J. (Pittsburgh PA) Snyder Francis S. (Coraopolis PA), Method for producing permanent magnet alloy particles for use in producing bonded permanent magnets.
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McCallum R. William (Ames IA) Dennis Kevin W. (Ames IA) Lograsso Barbara K. (Ames IA) Anderson Iver E. (Ames IA), Method of making bonded or sintered permanent magnets.
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Lloyd Jerry D. (St. Louis MO), Method of making permanent magnet assembly.
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Mukai Toshio (Kanagawaken JPX) Fujimoto Tatsuo (Kanagawaken JPX) Sakamoto Hiroaki (Kanagawaken JPX), Method of making rare earth magnets.
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Hirokazu Kanekiyo JP; Satoshi Hirosawa JP, Method of manufacturing thin plate magnet having microcrystalline structure.
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Kanekiyo, Hirokazu; Miyoshi, Toshio; Hirosawa, Satoshi, Nanocomposite magnet and method for producing same.
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Kanekiyo, Hirokazu; Miyoshi, Toshio; Hirosawa, Satoshi, Nanocomposite magnet and method for producing same.
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Hirosawa Satoshi,JPX ; Kanekiyo Hirokazu,JPX ; Shigemoto Yasutaka,JPX, Nanocomposite magnet material and method for producing nanocomposite magnet.
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Yajima Kohichi (Urawa JPX) Kohmoto Osamu (Kamagaya JPX) Yoneyama Tetsuhito (Narashino JPX), Permanent magnet and method of producing same.
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Kanekiyo, Hirokazu; Miyoshi, Toshio; Hirosawa, Satoshi; Shigemoto, Yasutaka; Shioya, Yusuke, Permanent magnet including multiple ferromagnetic phases and method of producing the magnet.
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Yoneyama Tetsuhito (Chiba JPX) Nakamura Hideki (Narita JPX) Fukuno Akira (Chiba JPX), Permanent magnet material and method for making.
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Mizoguchi Tetsuhiko (Yokohama JPX) Inomata Koichiro (Yokohama JPX) Higuchi Toru (Tsuruoka JPX) Sakai Isao (Yokohama JPX), Permanent magnetic alloy and method of manufacturing the same.
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Inoue Akihisa,JPX ; Takeuchi Akira,JPX, Permanent magnetic material and permanent magnet.
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Fujimura Setsuo (Kyoto JPX) Sagawa Masato (Nagaokakyo JPX) Matsuura Yutaka (Ibaraki JPX) Yamamoto Hitoshi (Osaka JPX) Togawa Norio (Osaka JPX), Permanent magnets.
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Permanent magnet including multiple ferromagnetic phases and method for producing the magnet 원문보기

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