Toyota Jidosha Kabushiki Kaisha

Aisin Takaoka Co., Ltd.

Akira Manabe

Tetsuya Shoji

Noritsugu Sakuma

Masao Yano

Hidefumi Kishimoto

Hiroshi Okajima

Noritaka Miyamoto

Masaaki Ito

Daisuke Ichigozaki

Yoshihiko Ito

Akira Kato

Kimihiko Ando

Kurima Kobayashi

Yositaka Takahasi

Eiji Ito

Motoki Hiraoka

Shoichi Harakawa

Setsuto Daiza

Tadataka Kaneko

Shunji Suzuki

Shinya Omura

Mikiya Nozaki

Kota Washio

Shinya Nagashima

Takahiro Sato

Kazufumi Niwa

Yoshihiro Hibino

Kazumi Ohtake

Yuya Ikeda

Akio Yasuda

Yositaka Takahashi

Yukio Monden

A magnetic compound represented by the formula (RR)(FeCo)TMwherein Ris one or more elements selected from the group consisting of Sm, Pm, Er, Tm and Yb, Ris one or more elements selected from the group consisting of Zr, La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho and Lu, T is one or more elements selected from the group consisting of Ti, V, Mo, Si and W, M is one or more elements selected from the group consisting of unavoidable impurity elements, Al, Cr, Cu, Ga, Ag and Au, 0&#x2264;x&#x2264;0.7, 0&#x2264;y&#x2264;0.7, 4&#x2264;a&#x2264;20, b=100-a-c-d, 0&#x3c;c&#x3c;7.7, and 0&#x2264;d&#x2264;3, the magnetic compound having a ThMn-type crystal structure, wherein the volume fraction of &#x3b1;-(Fe, Co) phase is less than 12.3%.

Magnetic compound and production method thereof

To provide a rare earth magnet ensuring excellent magnetic anisotropy while reducing the amount of Nd, etc., and a manufacturing method thereof. A rare earth magnet comprising a crystal grain having an overall composition of (R2R1)FeCoBTM(wherein R2 is at least one of Nd, Pr, Dy and Tb, R1 is an alloy of at least one or two or more of Ce, La, Gd, Y and Sc, TM is at least one of Ga, Al, Cu, Au, Ag, Zn, In and Mn, 0&#x3c;x&#x3c;1, y=12 to 20, z=5.6 to 6.5, w=0 to 8, and v=0 to 2), wherein the average grain size of the crystal grain is 1,000 nm or less, the crystal grain consists of a core and an outer shell, the core has a composition of R1 that is richer than R2, and the outer shell has a composition of R2 that is richer than R1.

Rare-earth magnet and method for manufacturing same

A method for producing a raw material powder of a permanent magnet, includes: preparing a material powder of a permanent magnet, measuring magnetic characteristics of the material powder, and judging the quality of the material powder as the raw material powder based on a preliminarily determined relation between magnetic characteristics and the structure of the material powder. A method for producing a permanent magnet includes integrating material powders judged as good in the step of judging the quality as raw material powders by the method for producing a raw material powder of a permanent magnet. A method for inspecting a permanent magnet material powder includes transmitting a magnetic field to a material powder of a permanent magnet, receiving the magnetic field from the material powder, and measuring a magnetic field difference between the transmitted magnetic field and the received magnetic field as magnetic characteristics of the material powder.

Permanent magnet source powder fabrication method, permanent magnet fabrication method, and permanent magnet raw material powder inspection method

Provided is a magnetic compound represented by the formula (RZr)(FeCo)TMA(wherein R represents one or more rare earth elements, T represents one or more elements selected from the group consisting of Ti, V, Mo, and W, M represents one or more elements selected from the group consisting of unavoidable impurity elements, Al, Cr, Cu, Ga, Ag, and Au, A represents one or more elements selected from the group consisting of N, C, H, and P, 0&#x2264;x&#x2264;0.5, 0&#x2264;y&#x2264;0.6, 4&#x2264;a&#x2264;20, b=100&#x2212;a&#x2212;c&#x2212;d, 0&#x3c;c&#x3c;7, 0&#x2264;d&#x2264;1, and 1&#x2264;e&#x2264;18), in which a main phase of the magnetic compound includes a ThMntype crystal structure, and a volume percentage of an &#x3b1;-(Fe,Co) phase is 20% or lower.

Magnetic compound and method of producing the same

Provided is a rare-earth magnet containing no heavy rare-earth metals such as Dy or Tb in a grain boundary phase, has a modifying alloy for increasing coercivity (in particular, coercivity under a high-temperature atmosphere) infiltrated thereinto at lower temperature than in the conventional rare-earth magnets, has high coercivity, and has relatively high magnetizability, and a production method therefor. The rare-earth magnet RM includes a RE-Fe&#x2014;B-based main phase MP with a nanocrystalline structure (where RE is at least one of Nd or Pr) and a grain boundary phase BP around the main phase, the grain boundary phase containing a RE-X alloy (where X is a metallic element other than heavy rare-earth elements). Crystal grains of the main phase MP are oriented along the anisotropy axis, and each crystal grain of the main phase, when viewed from a direction perpendicular to the anisotropy axis, has a plane that is quadrilateral in shape or has a close shape thereto.

Rare-earth magnet and method for producing the same

A method for manufacturing a rare-earth magnet, through hot deformation processing, having a high degree of orientation at the entire area thereof and high remanence, without increasing processing cost including a step of press-forming powder as a rare-earth magnetic material to form a compact S; and a step of performing hot deformation processing to the compact S, thus manufacturing the rare-earth magnet C. The hot deformation processing includes two steps of extruding and upsetting. The extruding is to place a compact S in a die Da, and apply pressure to the compact S' in a heated state with an extrusion punch PD so as to reduce the thickness for extrusion to prepare the rare-earth magnet intermediary body S&#x2033; having a sheet form, and the upsetting is to apply pressure to the rare-earth magnet intermediary body S&#x2033; in the thickness direction to reduce the thickness, thus manufacturing the rare-earth magnet C.

Rare-earth magnet production method

A method of producing an R-T-B rare earth magnet that include forming an R-T-B (R: rare-earth element, T: Fe, or Fe and partially Co that substitutes for part of Fe) rare earth alloy powder into a compact and performing hot working on the compact, wherein the hot working is performed in a direction that is different from the direction in which the forming was performed.

Method producing rare earth magnet

A method of die casting spheroidal graphite cast iron able to prevent formation of chill crystals to allow the crystallization of fine spheroidal graphite and simultaneously prevent the formation of internal defects, including the steps of preparing a die formed with a heat insulation layer at inside walls of a cavity, filling molten metal having a composition of the spheroidal graphite cast iron through a runner into the cavity, closing the runner so as to seal the cavity right before the molten metal in the cavity starts to solidify, and allowing the molten metal to solidify by the action of the inside pressure caused by crystallization of the spheroidal graphite in the sealed cavity.

Method of die casting spheroidal graphite cast iron

Hard particles are provided containing 20 to 70% of Mo, 0.5 to 3% of C, 5 to 40% of Ni, 1 to 20% of Mn, a balance in Fe, and impurities, where % represents percentage by mass, and may further contain at least one of 40% or less of Co, 0.1 to 10% of Cr, and 4% or less of Si. A wear resistant iron-based sintered alloy contains 4 to 30% of Mo, 0.2 to 3% of C, 1 to 20% of Ni, 0.5 to 12% of Mn, a balance in Fe, and impurities, with respect to the total mass of the iron-based sintered alloy as represented by 100%. In the sintered alloy, the base contains 0.2 to 5% of C, 0.1 to 12% of Mn, a balance in Fe, and impurities, with respect to the total mass of the base, and the hard particles contain 20 to 70% of Mo, 0.5 to 3% of C, 5 to 40% of Ni, 1 to 20% of Mn, a balance in Fe, and impurities, with respect to the total mass of the hard particles. The hard particles are dispersed in the base with an area ratio of 0.10 to 0.60. A method to produce a wear resistant sintered alloy of the above composition is also provided.

Hard particles, wear resistant iron-based sintered alloy, method of producing wear resistant iron-based sintered alloy, valve seat, and cylinder head

An overlaying alloy containing no Cr or a reduced amount of Cr, in which an effective amount of Mo oxide is formed even in a weak oxidizing atmosphere such as a combustion atmosphere of diesel engines and engines using CNG, LPG or other gases as a fuel to provide an improved non-damaging property and wear resistance. An overlaying alloy comprising 20-70 wt % Mo, 0.5-3 wt % C, 5-40 wt % Ni, and the balance being Fe and unavoidable impurities, which contains no Cr to facilitate formation of Mo oxide and is advantageously applied to the parts on which an oxide coating is not easily formed such as the engine parts subject to a lower temperature combustion atmosphere. An overlaying alloy comprising 20-60 wt % Mo, 0.2-3 wt % C, 5-40 wt % Ni, 0.1-10 wt % Cr, and the balance of Fe and unavoidable impurities, which contains a small amount of Cr to control formation of Mo oxide and is advantageously applied to the parts on which an oxide coating is relatively easily formed. Other alloying elements such as Mn, Co, Si, Nb may be added in the alloy in accordance with need.

Overlay welding alloy and engine valve overlayed therewith

A process for producing a sliding member employs a base material having a covering surface and pores, and a layer material comprising a constitutive component for reacting with a constitutive component of the base material. Initially, the layer material comes into contact with at least part of the covering surface of the base material. Next, the both are heated to the sintering temperature of the base material. Thus, a molten liquid occurs at the boundary between the base material and the layer material. Since the solidus temperature of the molten liquid increases with the reaction proceeding, the molten liquid can solidify early to seal the pores at the covering surface of the base material early. Therefore, the layer material remains on the covering surface of the base material, the remaining layer material comes to constitute a sliding surface.

Process for producing a sliding member and a process for producing a

Disclosed are an Fe-based alloy powder adapted for sintering, an Fe-based sintered alloy, and a process for producing the Fe-based sintered alloy. The Fe-based alloy powder or the matrix of the Fe-based sintered alloy consists, percent by weight, essentially of 2.0 to 15% Co, 2.0 to 10% Mo, and the balance of Fe and inevitable impurities. The Fe-based alloy powder exhibits superb compressibility and corrosion resistance, and accordingly the Fe-based sintered alloy made therefrom exhibits excellent wear resistance, corrosion resistance and oxidation resistance. The Fe-based sintered alloy is further improved in the excellent properties by dispersing novel Ni-based alloy hard particles in the matrix.

Fe-based alloy powder adapted for sintering, Fe-based sintered alloy

Fe-based alloy powder and adapted for sintering, Fe-based sintered alloy

Fe-based sintered alloy having wear resistance

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Miyoshi, Japan

Akira Manabe