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公开(公告)号：DE102004055694A1
公开(公告)日：2005-07-07
申请号：DE102004055694
申请日：2004-11-18
Applicant: DENSO CORP
Inventor： NISHIJIMA YOSHIAKI , NOMURA YURIO , YAMAGUCHI KOUICHI , ISHIKAWA YUUICHI , HAYAMA HIDEKAZU
Abstract: The invention provides a method for manufacturing a soft magnetic powder material covered by oxide layers at surfaces of the powder, by using a soft magnetic alloy powder containing a soft magnetic powder material and a second element such as Si having an oxidizing reactivity higher than iron, and heating the soft magnetic alloy powder in an atmosphere of a weak oxidizing gas by mixing a weak oxidizing gas in an inert gas, and oxidizing selectively the second element at surface layers of the powder while restraining an oxidation of iron to form thin oxide layers with high electrical resistance.
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公开(公告)号：FR2874121A1
公开(公告)日：2006-02-10
申请号：FR0508347
申请日：2005-08-04
Applicant: DENSO CORP
Inventor： ISHITANI MASAHIRO , NISHIJIMA YOSHIAKI , NOMURA YURIO , YAMAGUCHI KOUICHI , HAYAMA HIDEKAZU
IPC: H01F1/12
Abstract: L'invention procure un procédé pour fabriquer un matériau magnétique doux, dans lequel une poudre d'alliage de fer et de silicium (Fe-Si) est chauffée dans une atmosphère faiblement oxydante pour former une pellicule d'oxyde de silicium (SiO2) sur la surface, et la poudre est ensuite moulée par pression et cuite dans une atmosphère faiblement oxydante, pour obtenir un produit fritté. En accomplissant l'étape d'oxydation de surface dans une atmosphère faiblement oxydante, telle que de la vapeur d'eau, le silicium (Si) est oxydé sélectivement pour former une pellicule d'oxyde mince avec une résistance électrique élevée. En outre, en cuisant le produit moulé dans une atmosphère faiblement oxydante, le frittage peut être effectué tout en réparant la pellicule d'oxyde, dans laquelle des fissures et autres sont créées dans le moulage par pression.
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公开(公告)号：DE102005036858A1
公开(公告)日：2006-02-23
申请号：DE102005036858
申请日：2005-08-04
Applicant: DENSO CORP
Inventor： ISHITANI MASAHIRO , NISHIJIMA YOSHIAKI , NOMURA YURIO , YAMAGUCHI KOUICHI , ISHIKAWA YUICHI , HAYAMA HIDEKAZU
IPC: H01F1/12
Abstract: The invention provides a method for manufacturing a soft magnetic material, wherein an Fe-Si alloy powder is heated in a weakly oxidizing atmosphere to form a SiO 2 oxide film on the surface, and the powder is then press-molded and fired in a weakly oxidizing atmosphere to obtain a sintered product. By performing the surface oxidizing step in a weakly oxidizing atmosphere such as water vapor, Si is selectively oxidized to form a thin oxide film with high electrical resistance. Furthermore, by firing the molded product in a weakly oxidizing atmosphere, the sintering can be performed while the oxide film, in which cracks and the like are generated at the press-molding, is repaired.
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Patent Agency Ranking
公开(公告)号：JP2006108475A
公开(公告)日：2006-04-20
申请号：JP2004294709
申请日：2004-10-07
Applicant: Denso Corp , Hitachi Powdered Metals Co Ltd , 日立粉末冶金株式会社 , 株式会社デンソー
Inventor： ISHITANI MASAHIRO , NISHIJIMA YOSHIAKI , NOMURA YURIO , ASAKA KAZUO , ISHIHARA CHIO , YAMAGUCHI KOICHI , ISHIKAWA YUICHI , HAYAMA HIDEKAZU
Abstract: PROBLEM TO BE SOLVED: To produce a sintered body having a fine and rigid high electric resistance layer on the surface of soft magnetic powder through a simple process using inexpensive soft magnetic powder principally comprising iron as a material.
SOLUTION: Fe-Si alloy powder is heated in weak oxidizing atmosphere to form an SiO
2 oxide film on the surface and after being pressed, it is calcinated in weak oxidizing atmosphere to produce a sintered body. Surface oxidation process is carried out in weak oxidizing atmosphere of steam, or the like, to oxide Si selectively thus forming a thin oxide film of high electric resistance, which is then further calcinated in weak oxidizing atmosphere. The oxide film cracked at the time of press molding is repaired by repeating oxidation in pressurization atmosphere and degassing in pressure reduction atmosphere thus obtaining a high quality sintered body.
COPYRIGHT: (C)2006,JPO&NCIPIAbstract translation: 要解决的问题：使用以铁为材料的廉价的软磁粉末，通过简单的工艺，在软磁性粉末的表面上制造具有微细刚性高电阻层的烧结体。 解决方案：在弱氧化气氛中加热Fe-Si合金粉末，在表面形成SiO
2 氧化物膜，经过压制后，在弱氧化气氛中煅烧，制成烧结体 。 表面氧化处理在蒸汽等的弱氧化气氛中进行，选择性地形成氧化物Si，从而形成高电阻的薄氧化膜，然后在弱氧化气氛中进一步煅烧。 通过在加压气氛中重复氧化并在减压气氛中脱气来修复压制成型时的氧化膜破裂，得到高质量的烧结体。 版权所有（C）2006，JPO＆NCIPI -
公开(公告)号：JP2006134958A
公开(公告)日：2006-05-25
申请号：JP2004319734
申请日：2004-11-02
Applicant: Denso Corp , Hitachi Powdered Metals Co Ltd , 日立粉末冶金株式会社 , 株式会社デンソー
Inventor： NISHIJIMA YOSHIAKI , ISHITANI MASAHIRO , NOMURA YURIO , YAMAGUCHI KOICHI , ISHIKAWA YUICHI , HAYAMA HIDEKAZU , ASAKA KAZUO , ISHIHARA CHIO
Abstract: PROBLEM TO BE SOLVED: To provide a method of easily manufacturing a soft magnetic material which is of low iron loss and superior in magnetic characteristics. SOLUTION: The soft magnetic material is manufactured with the host phase of soft magnetic metal existing in many regions partitioned by a diaphragm having high electrical resistance characteristics. A raw material powder is prepared which is an aggregate of soft magnetic particles 10, where an oxide film 30 which is to be the diaphragm is coated on the surface of host phase particles 20 of soft magnetic metal. A coupling agent 8, containing the metal element whose oxidizing reaction is higher than the soft magnetic metal constituting the host phase particles 20, is added to the raw material powder. The raw material powder, to which the coupling agent 8 has been added, is pressed to form a molding 110 of desired shape. Then the molding 110 is baked. The coupling agent 8 is preferably a silane-coupling agent. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract translation: 要解决的问题：提供一种易于制造铁损低且磁特性优异的软磁性材料的方法。 解决方案：软磁性材料的制造方法是将磁性金属的主体相存在于由具有高电阻特性的隔膜分隔的许多区域中。 制备作为软磁性颗粒10的集合体的原料粉末，其中作为隔膜的氧化膜30涂覆在软磁性金属的主体相颗粒20的表面上。 将含有氧化反应高于构成主体相颗粒20的软磁性金属的金属元素的偶联剂8添加到原料粉末中。 加入了偶联剂8的原料粉末被压制，形成所需形状的成型体110。 然后将模制件110烘烤。 偶联剂8优选为硅烷偶联剂。 版权所有（C）2006，JPO＆NCIPI
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公开(公告)号：JP2006049625A
公开(公告)日：2006-02-16
申请号：JP2004229500
申请日：2004-08-05
Applicant: Denso Corp , 株式会社デンソー
Inventor： ISHITANI MASAHIRO , NISHIJIMA YOSHIAKI , NOMURA YURIO , YAMAGUCHI KOICHI , ISHIKAWA YUICHI , HAYAMA HIDEKAZU
CPC classification number: H01F41/0246 , B22F1/0088 , B22F2999/00 , H01F1/24 , H01F1/33 , B22F2201/05
Abstract: PROBLEM TO BE SOLVED: To provide a manufacturing method of manufacturing a sintered body wherein soft magnetic powder whose principal component is inexpensive iron is used for a raw material and the surface of the soft magnetic powder has a tight and strong high electric resistance layer with simple processes.
SOLUTION: Fe-Si alloy powder is heated in a weakly acidic environment to form an SiO
2 oxide film on the surface, the powder is press-formed, and sintered in the weakly acidic environment to obtain the sintered body. A thin oxide film with high electric resistance and the Si of which is selectively oxidized is formed by executing a surface oxidation process in the weakly acidic environment using water vapor, and the powder is furthermore sintered in the weakly acidic environment to permit sintering while repairing the oxide film wherein cracks or the like are caused during press forming.
COPYRIGHT: (C)2006,JPO&NCIPIAbstract translation: 要解决的问题：提供一种制造烧结体的制造方法，其中使用主要成分为廉价的铁的软磁性粉末作为原料，并且软磁性粉末的表面具有紧密而强的高电阻 层次简单的过程。 解决方案：将Fe-Si合金粉末在弱酸性环境中加热，在表面形成SiO 2 SBO 2氧化物膜，将粉末压制成型，并在弱酸性环境下烧结 得到烧结体。 通过在弱酸性环境中使用水蒸汽进行表面氧化处理，形成具有高电阻且Si被选择性氧化的薄氧化膜，并且在弱酸性环境中进一步烧结粉末以允许烧结，同时修复 在冲压成形时产生裂纹等的氧化膜。 版权所有（C）2006，JPO＆NCIPI
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公开(公告)号：JP2005154791A
公开(公告)日：2005-06-16
申请号：JP2003391318
申请日：2003-11-20
Applicant: Denso Corp , 株式会社デンソー
Inventor： NISHIJIMA YOSHIAKI , NOMURA YURIO , YAMAGUCHI KOICHI , ISHIKAWA YUICHI , HAYAMA HIDEKAZU
CPC classification number: H01F1/33
Abstract: PROBLEM TO BE SOLVED: To produce a soft magnetic powder material having a high electric resistance layer of a thin film on the surface of powder essentially composed of inexpensive iron by a simple process.
SOLUTION: Soft magnetic alloy powder essentially comprised of iron and comprising a second element having oxidation reactivity higher than that of iron such as Si is used. The soft magnetic alloy powder is heated in a weak-oxidizing atmosphere obtained by mixing a weak-oxidizing gas such as water vapor into an inert gas, and the second element in the surface layer part of the powder is selectively subjected to oxidation reaction while suppressing the oxidation of iron to form a thin oxide film having high electric resistance.
COPYRIGHT: (C)2005,JPO&NCIPIAbstract translation: 要解决的问题：通过简单的工艺在基本上由便宜的铁构成的粉末的表面上制造具有高电阻薄膜的软磁性粉末材料。 解决方案：使用主要由铁组成的软磁合金粉末，其包含具有高于诸如Si的铁氧化反应性的第二元素。 软磁性合金粉末在通过将诸如水蒸汽的弱氧化气体混合到惰性气体中获得的弱氧化气氛中加热，并且粉末的表层部分中的第二元素选择性地进行氧化反应同时抑制 铁的氧化形成具有高电阻的薄氧化膜。 版权所有（C）2005，JPO＆NCIPI
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公开(公告)号：JP2006108559A
公开(公告)日：2006-04-20
申请号：JP2004296324
申请日：2004-10-08
Applicant: Denso Corp , Hitachi Powdered Metals Co Ltd , 日立粉末冶金株式会社 , 株式会社デンソー
Inventor： ISHITANI MASAHIRO , NOMURA YURIO , ASAKA KAZUO , ISHIHARA CHIO , HAYAMA HIDEKAZU , YAMAGUCHI KOICHI , ISHIKAWA YUICHI
Abstract: PROBLEM TO BE SOLVED: To provide a wire rod for core capable of realizing low iron loss, high flux and high permeability while facilitating production, and to provide its production process, a core and its production process. SOLUTION: The core 25 has a columnar portion formed by bundling a plurality of wire rods 10 for core each consisting of an iron core material 12, and an insulation coating 16 composed of an oxide film for forming the coating having Gibbs free energy lower than that of iron and covering the surface of the core material. Since the insulation coating 16 is formed on the outer circumferential surface of each wire rod 10, generation of eddy current can be suppressed when flux flows through the core 25. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract translation: 要解决的问题：提供一种能够实现低铁损，高通量和高渗透性同时促进生产并提供其生产工艺，核心及其生产工艺的用于芯的线材。 解决方案：芯部25具有通过捆扎多个铁芯线材10形成的柱状部分，每个由铁芯材料12组成的线材10和由用于形成具有吉布斯自由能的涂层的氧化膜组成的绝缘涂层16 低于铁，并覆盖芯材表面。 由于绝缘涂层16形成在每个线材10的外圆周表面上，所以当磁通流过芯25时，可以抑制涡电流的产生。（C）2006，JPO＆NCIPI
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