Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Other

Hitachi Powdered Metals Co., Ltd.

Hiatchi, Ltd.

Yuichi Satsu

Matahiro Komuro

Akio Takahashi

Takao Imagawa

Hiroyuki Suzuki

Masao Suzuki

Harukazu Nakai

Takumi Ueno

Takashi Yasuhara

Yuzo Ito

Haruo Akahoshi

Yutaka Matsunobu

Katsumi Ishikawa

Yoshii Morishita

Takeyuki Itabashi

Mitsuo Katayose

Katsuo Sugawara

Shigeaki Funyu

Akira Nagai

Toshiya Satoh

Shuichi Suzuki

Tomoichi Kamo

Tadashi Fujieda

Hiroaki Miyata

Takao Miwa

Kazuhiro Suzuki

Kishio Hidaka

Yasuhisa Aono

Noboru Baba

Chio Ishihara

Mitsuo Hayashibara

Kunio Miyazaki

Hideaki Katayama

Ryuji Watanabe

Kazuo Asaka

Shinji Yamada

Takayuki Kanda

Yoshiyuki Takamori

Chahn Lee

Osamu Miura

Yuzo Kozono

Kazuhiro Satou

Chikara Tanaka

Morimichi Umino

Shuichi Oohara

Akira Sugawara

Yuji Enomoto

Noriaki Hino

Motoyo Wajima

Haruo Koharagi

Shin Nishimura

Toshio Miyamoto

Kunihiro Maeda

Shigeru Takahashi

Mineo Kawamoto

Shigeo Amagi

Yoshiyuki Tsuru

Masahiro Suzuki

Toshiaki Ishimaru

Michio Ohue

Seunghwan Park

Yoshiaki Okabe

Masashi Miyazaki

Isao Kitagawa

Naoki Yoshimoto

Yukio Ookoshi

Hisamitsu Hatou

Yoshiko Nakai

Igor Yefimovich Kardash

Andrei Vladimirovich Pebalk

Sergei Nicolaevich Chvalun

Karen Andranikovich Mailyan

Nobuo Abe

Provided are: a sintered magnet having an improved maximum energy product while maintaining the magnetic coercivity of the magnet; and a production method for such a sintered magnet. The sintered magnet () according to the present invention comprises particles () each including: a main phase () in which the main component is a compound containing a rare-earth element and iron; and a diffusion layer () provided on the surface of the main phase (). The diffusion layers () are characterized by: containing, as a main component, a compound resulting from a solid-solution of carbon and/or nitrogen in said compound of the main phase (); and having a concentration gradient of carbon and/or nitrogen from the surfaces of the particles () toward the interior thereof.

Sintered magnet and production method for sintered magnet

A soft magnetic material that is sheet-shaped or foil-shaped and has a high saturation magnetic flux density, contains iron, carbon, and nitrogen, and includes a martensite containing carbon and nitrogen, and γ-Fe, wherein the γ-Fe includes a nitrogen-containing phase. The soft magnetic material is produced by steps of heating an iron-based material that is sheet-shaped or foil-shaped, carburizing the iron-based material with a carburizing gas, dispersing a granular carbide in α-Fe in the iron-based material at a temperature equal to or lower than a eutectoid temperature, transforming the α-Fe into γ-Fe at a temperature higher than the eutectoid temperature, diffusing nitrogen into the γ-Fe using a nitrogen supply gas to form γ-Fe—N—C, and rapidly heating and then rapidly cooling the γ-Fe—N—C to transform the γ-Fe—N—C into a martensite. The result is a thermally stable soft magnetic material having a saturation magnetic flux density higher than that of pure iron.

Soft magnetic material and method for producing the same, and electric motor containing soft magnetic material

To provide an energy management system that effectively uses a solar power generation system and a solar heat collection system to thereby make it possible to maximize a cost merit of a user. An energy management system related to the present invention includes: a solar power generation system that includes a solar panel to generate electric power on the basis of a solar light; a solar heat collection system that collects solar heat based on the solar light; and a control part that determines whether or not heat can be stored by the solar heat collection system from output characteristics of the solar power generation system and that drives the solar heat collection system in a case where the heat can be stored.

Energy management system, and energy management method

The purpose of the present invention is to provide an alcoholic solvent, in which FeCo-based particles becoming a soft magnet are improved, for enhancing properties of a magnetic material using no heavy rare earth elements, and is to provide a sintered magnet produced by using it.

Alcoholic solution and sintered magnet

Disclosed is a sintered magnet which is a rare-earth magnet using a less amount of a rare-earth element but having a higher maximum energy product and a higher coercivity. The sintered magnet includes a NdFeB crystal; and an FeCo crystal adjacent to the NdFeB crystal through the medium of a grain boundary. The FeCo crystal includes a core and a periphery and has a cobalt concentration decreasing from the core to the periphery. The FeCo crystal has a difference in cobalt concentration of 2 atomic percent or more between the core and the periphery. In the NdFeB crystal, cobalt and a heavy rare-earth element are unevenly distributed and enriched in the vicinity of the grain boundary.

Sintered magnet

Characteristics of a magnetic material are improved without using a heavy rare earth element as a scarce resource. By incorporating fluorine into a magnetic powder and controlling the crystal orientation in crystal grains, a magnetic material securing magnetic characteristics such as coercive force and residual flux density can be fabricated. As a result, the resource problem with heavy rare earth elements can be solved, and the magnetic material can be applied to magnetic circuits that require a high energy product, including various rotating machines and voice coil motors of hard discs.

Magnetic material and motor using the same

A ferromagnetic compound magnet in accordance with the present invention includes a ferromagnetic compound based on a binary alloy containing R&#x2014;Fe system (R is a 4f transition element or Y) or a ternary allay containing R&#x2014;Fe-T system (R is a 4f transition element or Y, and T is a 3d transition element except for Fe, or Mo, Nb or W), the ferromagnetic compound being characterized by: atomic percentage of the element R to the element Fe or to the elements Fe and T is 15% or lower; an element F is incorporated into an interstitial position in a crystal lattice of the alloy. The ferromagnetic compound is expressed in a chemical formula of: RFeF; R(Fe,T)F; RFeF; R(Fe,T)F; RFeF; or R(Fe,T)F(0&#x3c;x&#x2266;3, 0&#x3c;y&#x2266;4, 0&#x3c;z&#x2266;1).

Ferromagnetic compound magnet

To mold a high-resistance magnet at low temperature, including room temperature, the magnet includes magnetic powders, metallic powders having a lower hardness than the magnetic powders and a high-resistance layer, wherein the magnetic powders occupy a larger volume than the metallic powders. In particular, the high-resistance layer contains a fluorine compound and is placed between the magnetic powder and the metallic powders.

Powdered-iron magnet and rotating machine using the same

A permanent magnet type electric rotating machine having a high resistance permanent magnet used for the electric rotating machine, the permanent magnet containing a magnetic powder and a fluorine compound, in which the current waveform is controlled for reducing the loss to satisfy a relation: A&#x3c;C&#x3c;B and restrict the 7th higher-harmonic component to 20% or less where A is the content for the 5th higher harmonic component, B is the content for the 7th higher harmonic component, and C is the content for the 11th higher harmonic component, assuming the total of contents for the fundamental components of a current supplied to the findings being 100%.

Permanent magnet type electric rotating machine

An R&#x2014;Fe&#x2014;B sintered magnet has a structure including main phase crystal grains and a grain boundary area surrounding the crystal grains. The sintered magnet includes fluorine and a specified metal element selected from elements belonging to Group 2 through Group 16 of periodic table excepting the rare earth element, carbon and boron. The fluorine has a higher concentration in a region closer to a magnet surface than in the center. The specified element also has a higher concentration in the region closer to the surface. The sintered magnet includes oxyfluoride containing carbon, Dy and the metal element in a grain boundary area region at a distance of 1 &#x3bc;m or greater from the magnet surface, and the carbon has a higher concentration than the concentration of the metal element in a region at a distance of 1 &#x3bc;m to 500 &#x3bc;m from the magnet surface.

Rotating machine with sintered magnet and method for producing sintered magnet

A rare earth magnet having a composition represented by RTB wherein R denotes a rare earth element, T a transition metal and B boron, the magnet being composed of magnet powder constituted by crystalline particles. The particles of the magnetic powder have a ratio of a short diameter being 10 &#x3bc;m or more to a long diameter is 0.5 or less. An element Rm having a magnetic anisotropy higher than that of the rare earth element is contained in the surface and inside of the magnet constituted by the magnet powder in an approximately constant concentration. An oxy-fluoride and carbon are present at boundaries of the particles of the magnet powder.

Rare earth magnet

A manufacturing method of a magnetic core includes a first step of applying a treatment liquid for forming an insulating film to iron powder; a second step of heat-treating the iron powder to which the treatment liquid has been applied, at a temperature higher than 350 degrees; a third step of compacting the heat-treated iron powder to form a magnetic core; and a forth step of heat-treating the magnetic core at a temperature ranging from 600 degrees to 800 degrees.

Compacted magnetic core, production method of the same, and motor for electric vehicle

A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ferromagnetic material grains, wherein an amount of iron atoms in the fluorine compound particles is 1 to 50 atomic %.

High resistance magnet and motor using the same

In a ferromagnetic material containing at least one kind of rare-earth element, a layer containing at least one kind of alkaline earth element or rare-earth element and fluorine is formed at the grain boundary or near the powder surface of the ferromagnetic material. A further layer containing at least one kind of rare-earth element, having a fluorine concentration lower than that of the layer described first and having a rare-earth element concentration higher than that of the host phase of the ferromagnetic material, or an oxide layer containing a rare-earth element is formed in adjacent with a portion of the layer described first.

Rare-earth magnet

The object of the present invention is to provide a rare earth magnet which enables to achieve a good balance between high coercive force and high residual magnetic flux density, and its manufacturing method. The present invention provides a rare earth magnet in which a layered grain boundary phase is formed on a surface or a portion of a grain boundary of NdFeB which is a main phase of an R&#x2014;Fe&#x2014;B (R is a rare-earth element) based magnet, and wherein the grain boundary phase contains a fluoride compound, and wherein a thickness of the fluoride compound is 10 &#x3bc;m or less, or a thickness of the fluoride compound is from 0.1 &#x3bc;m to 10 &#x3bc;m, and wherein the coverage of the fluoride compound over a main phase particle is 50% or more on average. Moreover, after layering fluoride compound powder, which is formed in plate-like shape, in the grain boundary phase, the rare earth magnet is manufactured by quenching the layered compound after melting it at a vacuum atmosphere at a predetermined temperature, or by heating and pressing the main phase and the fluoride compound to make the fluoride compound into a layered fluoride compound along the grain boundary phase.

Rare-earth magnet and manufacturing method thereof and magnet motor

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Hitachi, Japan

Yuichi Satsu