Toyota Jidosha Kabushiki Kaisha

Other

Fine Sinter Co., Ltd

Jfe Steel Corporation

Toshiya Yamaguchi

Eisuke Hoshina

Tadahiko Furuta

Yusuke Oishi

Takashi Saito

Kazutaka Tatematsu

Yasuhiro Endo

Kazuhiro Kawashima

Takashi Kawano

Ryoji Mizutani

Naomichi Nakamura

Yoshinori Shibata

Tatsuhiko Hiratani

Takeshi Hattori

Daisuke Okamoto

Yutaka Komatsu

Kenji Harada

Hironori Aoyama

Yu Takanezawa

Noriko Makiishi

Shinjiro Saigusa

Izuru Yamamoto

Masaki Sugiyama

Hiroyuki Takamiya

Junghwan Hwang

Tomoyasu Kitano

Keisuke Kadota

Tomonori Inuzuka

Akio Hotta

Mitsutoshi Akiyama

Tatsuya Kitamura

Satoru Iwase

Takashi Haruta

Kouji Sakurai

Shota Ohira

A stainless steel that includes chromium and other alloying element as a plurality of alloying elements including: a base material layer including chromium of a specified chromium content necessary for forming a passive film or more; and a superficial layer including chromium at a lower chromium content than the chromium content contained in the base material layer, and the superficial layer including the other alloying elements at a same content of the other alloying element as the content of the other alloying element contained in the base material layer.

Stainless steel and method of manufacturing the same

An iron powder for dust cores is provided which can be formed into a dust core having a high resistivity and having a low iron loss without degrading the mechanical strength. The iron powder for dust cores includes an iron powder and an oxide film on the surface thereof, wherein the oxide film is composed of a Si-based oxide in which the ratio of Si to Fe satisfies Si/Fe&#x2267;0.8 on an atomic number basis.

Iron powder for dust cores

A method for manufacturing a powder for a magnetic core including at least a process of performing a siliconizing treatment on a surface of an iron powder containing elemental carbon. In the process of siliconizing treatment, a powder containing at least a silicon dioxide is brought into contact with the surface of the iron powder, elemental silicon is detached from the silicon dioxide by heating the powder of silicon dioxide, and the siliconizing treatment is performed by causing the detached elemental silicon to permeate and diffuse into a surface layer of the iron powder. The invention provides a method for manufacturing a powder for a magnetic core, by which loss reduction is achieved.

Powder for magnetic core, method for manufacturing powder for magnetic core, and dust core

A powder for a dust core comprising a silicon-containing layer formed within a depth of less than 0.15 D from the surface of the surface layer of a soft magnetic metal powder having a particle diameter D and a method for producing the same are provided. The method for producing a powder for a dust corecomprising a silicon-containing layercomprises performing silicon impregnation of the surface of a soft magnetic metal powder (particle)containing a carbon element, wherein:

Powder for dust core and method for producing the same

An object of the present invention is to provide a method for producing a dust core wherein generation of iron oxide at grain boundaries in the dust core is unlikely to take place upon annealing of the dust core subjected to compaction, thus allowing excellent electromagnetic characteristics to be realized. Also, the following is provided: a method for producing a dust core, which comprises: a step of molding a magnetic powder comprising a powder for a dust core formed with an iron-based magnetic powder coated with a silicone resin into a dust core via compaction; and a step of annealing the dust core via heating so as to cause the silicone resin contained in the dust core to be partially formed into a silicate compound, wherein annealing of the dust core is carried out at a dew point of an inert gas of &#x2212;40&#xb0; C. or lower in an inert gas atmosphere in the annealing step.

Method for producing dust core

In a stator core composed of a powder compacted magnetic body, a yoke part comprises a protrusion protruding from an axial end face of a tooth. The tooth has an axial length gradually decreases towards an outside along the radial direction of the stator core, and a circumferential length which gradually increases towards an outside along the radial direction of the stator core. In one of the cross sections of stator core perpendicular to a radial direction, the height difference between axial end faces of the yoke part and the tooth is substantially equal to an axial length of a coil end part. Further, a cross-sectional area of the tooth perpendicular to the radial direction is substantially maintained constant along the radial direction, and the cross-sectional area is secured at a junction between the tooth and the yoke part, while half of the cross-sectional area is secured in a circumferential cross section of the yoke part.

Motor generator and automobile carrying the same

A core comprises a plurality of core split members having yoke portions and tooth portions and arranged in such a circumferential shape that the yoke portions contact with each other while the tooth portions being directed inward. The core further comprises a ring contacting with the yoke portions, and stoppers mounted on the outer face sides of the yoke portions for fixing the ring on the yoke portions. The yoke portions and the ring are formed in corrugated shape to mesh with each other, and the stoppers are formed with projections that engage with the inner side of the ring. This structure provides both the rotating electrical machine core having the core split members arranged in the circumferential shape and fastened to each other while preventing occurrence of a stress and a positional displacement between the core split members, and a rotating electrical machine.

Rotating electrical machine core and rotating electrical machine

The invention provides a process for forging a titanium-based material comprises the steps of: preparing a titanium-based sintered workpiece including at least one of ceramics particles and pores in a total amount of 1% or more by volume, the ceramics particles being thermodynamically stable in a titanium alloy; and heating the workpiece to a forging temperature and forging the same. In the production process, the pores or the ceramics particles inhibit the grain growth during forging. Accordingly, it is possible to carry out the forging at a relatively high temperature at which the titanium-based material exhibits a small resistance to deformation. Moreover, the titanium-based material can maintain an appropriate microstructure even after the forging. Consequently, the impact value and the fatigue strength are inhibited from decreasing.

Process for forging titanium-based material, process for producing engine valve, and engine valve

Titanium-based composite material, method for producing the same and engine valve

A process for producing a particle-reinforced titanium alloy includes the steps of: heating a titanium alloy in which ceramic particles having a thermodynamically stable property are dispersed in a temperature range of not less than &bgr;-transus temperature; and cooling the titanium alloy to pass through the &bgr;-transus temperature at a cooling rate of 0.1-30&deg; C./second. The process can further include, before the heating step, the step of compressing the titanium alloy in a two phase temperature range of &agr;&plus;&bgr; thereof or in a temperature range of not less than &bgr;-transus temperature.

Process for producing particle-reinforced titanium alloy

Growing community of inventors

Nishikamo-gun, Japan

Toshiya Yamaguchi