Hitachi, Ltd.

Toshiba Corporation

Hitachi Engineering Co., Ltd.

Masahisa Inagaki

Hideo Maki

Iwao Takase

Junjiro Nakajima

Isao Masaoka

Hajime Umehara

Kazutaka Okamoto

Satoshi Hirano

Masayoshi Kanno

Satoshi Kanno

Shozo Nakamura

Yasuhisa Aono

Keiichi Kuniya

Koji Nishida

Yasunori Bessho

Jiro Kuniya

Tomio Odakura

Kimihiko Akahori

Tetsuo Yasuda

Toshimi Yoshida

Ryuichi Saito

Kinya Aota

Tadashi Fujieda

Hisanori Okamura

Osamu Yokomizo

Yoshihiko Koike

Hideo Arakawa

Junya Kaneda

Yasuo Kondo

Yuichiro Yoshimoto

Hiromasa Hirakawa

Teruyoshi Abe

Kiyomi Nakamura

Takehiro Seto

Hideki Kurosaki

Hideaki Ishizaki

Nobukazu Yamamoto

Tasuhisa Aono

Ryutarou Jimbow

Masanori Sakai

Makoto Hayashi

Kenichi Ito

Junichi Yamashita

Tatsuo Horiba

Yoshitaka Kojima

Katsumi Mabuchi

Katsumi Ohsumi

Kunio Miyazaki

Masateru Suwa

Fumio Jyoraku

Takeshi Tsukamoto

Takuya Takahashi

Takao Funamoto

Noriyuki Ohnaka

Hideyo Kodama

Toshiaki Arato

Yasuhiro Aizawa

Masakiyo Izumiya

Satoshi Kokura

Akihiro Yamanaka

Akihiko Saito

Takashi Haramaki

Fumio Sato

Tomohiko Shida

Kousei Nagayama

Masayuki Doi

Toshimi Sasaki

Hisao Suka

Hideo Soneda

Akira Maru

Hiromichi Imahashi

Ryo Ishibashi

Naoya Okizaki

Yoshitaka Nishino

Tsuneyuki Hashimoto

Tadashi Mizuno

Takeshi Obana

Yoshikazu Todaka

Toraki Sakuma

Minoru Umemoto

Kouichi Matsumoto

Tomomi Nakamura

Hiroaki Azuma

Nozomu Adachi

Tetsuro Yasuda

Toshitaka Kida

Nobuhiro Okazaki

Syouko Tanikoshi

Toshinori Dozono

Rinichi Asano

Tomio Unino

Ryutarou Jinbou

Ryutaro Jimbou

Ryutaro Jinbo

Masaru Tomobe

Disclosed is a zirconium alloy material having high corrosion resistance regardless of thermal history during its manufacturing process. The zirconium alloy material is obtained by providing a zirconium alloy containing on the mass basis: 0.001% to 1.9% of Sn, 0.01% to 0.3% of Fe, 0.01% to 0.3% of Cr, 0.001% to 0.3% of Ni, 0.001% to 3.0% of Nb, 0.027% or less of C, 0.025% or less of N, 4.5% or less of Hf and 0.16% or less of O with the remainder being inevitable impurities and zirconium, being formed of a bulk alloy and a surface layer, in which the surface layer has a plastic strain of 3 or more or a Vickers hardness of 260 HV or more and an arithmetic mean surface roughness Ra of 0.2 &#x3bc;m or less.

Zirconium alloy material

A friction stirring-welding method capable of increasing the welding strength of a lap joint. A welding tool () comprises a small diameter projected part () at the tip of a shoulder (). The welding tool is press-fitted to the upper plate () of the lap joint while being rotated. By a friction stirring action, an upper plate side welding boundary surface () plastically flows, a surface oxidation film on a lapped surface is peeled off, and the boundary surface is activated to provide an excellent welding part. Also, since the welding tool is formed in a shape having the small diameter semispherical projected part () at the tip thereof, the thickness () of an upper plate welding part is increased, and a lap joint part with high welding strength can be provided.

Friction stirring-welding method

A problem of FSW spot-welding is that a bonding strength tends to be low, since an area of metallic bonding is limited to the neighborhood of a pin portion of the welding tool. In order to solve the problem, after a tool () is inserted into a member () to be welded, a rotation shaft of the welding tool is tilted around a predetermined point () as a fulcrum, and the tip portion of the welding tool () is swung to enlarge a plastic flow area caused by rotation of the tool. As a result, the welding strength can be increased.

Method of friction stir-spot welding and welding apparatus

A composite material is provided, which has a low thermal expansivity, a high thermal conductivity, and a good plastic workability, which composite material may be applied to semiconductor devices and many other uses. The composite material is composed of metal and inorganic particles having a smaller coefficient of thermal expansion than the metal. It is characterized in that the inorganic particles are dispersed in such a way that 95% or more of them (in terms of their area in cross-section) form aggregates of complex configuration joined together. The composite material contains 20-80 vol % of copper oxide, with the remainder being copper. It has a coefficient of thermal expansion of 5&#xd7;10to 14&#xd7;10/&#xb0; C. and thermal conductivity of 30-325 W/m&#xb7;K in the range of room temperature to 300&#xb0; C. It is suitable for the radiator plate of semiconductor devices and the dielectric plate of electrostatic attractors.

Composite material including copper and cuprous oxide and application thereof

In a frictional stirring weld apparatus for bonding elements with a rotary tool, a head is movable with respect to the elements to position and orient the rotary tool so that a pin of the rotary tool is aligned along a boundary between first surfaces and a shoulder of the rotary tool faces to second surfaces extending radially outward from the first surfaces, and to generate a relative movement between the rotary tool and the elements along the second surfaces, and a compensating member is capable of holding thereon the rotary tool, at least partially rotatable on the rotational axis with respect to the head to rotate the rotary tool, and supported on the head movably along the rotational axis with respect to the head so that a positional relationship between the rotary tool and a combination of the elements is adjustable in a direction parallel to the rotational axis.

Apparatus and method for frictional stirring weld

Different metallic materials are joined in such a manner that friction heat generated by friction between a rotating probe made of a hard material and one of the metallic materials having a lower mechanical strength or a lower melting point than the other to effect plastic flow of the one material and the probe is inserted into a pit formed in a joint zone of the other material to fill the pit with the plastic flow material.

Method of joining metallic materials

In a joining method for manufacturing a rotor blade by joining a plurality of members, the members are pressed so as to exert a predetermined pressure on the bonding interface. A pulse voltage is applied to the members to pass electric current therethrough, and the joint portion is heated by resistance heating generated at the bonding interface and in the bulk of the members to cause diffusion bonding and thereby to join the members to each other. With this method, good joining can be achieved without substantially changing the crystal structure and mechanical properties of the base metals.

Method for manufacturing turbine blade and manufactured turbine blade

The invention provides a friction stir welding apparatus and method and a processing apparatus and method, which are not easily affected by deformations of a work being processed. The friction stir welding apparatus inserts a rotating tool into the work and moves the rotating tool relative to the work to join members of the work. The friction stir welding apparatus and method and the processing apparatus and method of the invention, the latter cutting or grinding the work with a rotating cutter or grindstone, comprises controlling a relative distance between the tool, cutter or grindstone and the work under the joining or processing operation or an insertion depth so that the load factor or electric current of a spindle motor for rotating the tool, cutter or grindstone is within a predetermined range, and a controller therefor.

Friction stir welding apparatus and method and processing apparatus and method

Reduction of air resistance which acts on the conventional motor-driven blower is limited because crushed protrusions are formed on the surface of the plate of the impeller of the conventional motor-driven blower, and this air resistance is a significant impediment to an increase of the operating speed of the motor-driven blower. Thus, an impeller is provided which comprises a front plate having a suction opening, a back plate disposed opposite to the front plate, and a plurality of blades disposed between the front plate and the back plate. At least either the front plate or the back plate is formed integrally with the blades.

Motor-driven blower and method of manufacturing impeller for

A channel box for a nuclear-reactor fuel assembly (MOX fuel assembly) containing plutonium, capable of properly controlling the excess reactivity without mixing neutron absorber or burnable poison into a fuel rod, and a channel box for a nuclear-reactor fuel assembly which does not form any gap between the channel box and members containing burnable poison in the channel box and in which the burnable poison does not directly contact with reactor water.

Fuel assembly channel box having burnable poison

The present invention provides a zirconium based alloy member which has very small deformation of elongation and bow occurring due to irradiation growth, a method of manufacturing it, and particularly an channel box for an atomic reactor fuel assembly. A zirconium based alloy plate member having a width of not less than 100 mm and a long length, containing not more than 5 wt % Nb and/or not more 5 wt % Sn, the member having (0001) orientation (Fl value) of hexagonal Zr with respect to longitudinal direction ranging from 0.20 to 0.35, the difference in Fl between the middle and the end being not more than the value calculated from (0.0935.times.Fl-0.00585) and an amount of bow at neutron irradiation of 35 GWd/t which bow occurs in the channel box for a reactor being not more than 2.16 mm.

Zirconium based alloy of low irradiation growth, method of producing the

A non-aqueous secondary battery having a long life-time and a high capacity density is provided by increasing the discharging capacity of the negative electrode and extending the life-time of the negative electrode. The nonaqueous secondary battery has a positive electrode and a negative electrode reversibly absorbing and discharging an alkaline metal and a nonaqueous electrolyte, wherein the negative electrode is made of an inter-metallic compound containing at least one element selected from the group consisting of 4A group elements, P and Sb, the inter-metallic compound has any one of CaF.sub.2 type, ZnS type and AlLiSi type crystal structures, and the CaF.sub.2 type structure is any one an inverse-fluorite structure and a fluorite structure having a lattice constant larger than 6.36 .ANG..

Nonaqueous secondary battery and negative electrode material therefor

The lower end of each of a plurality of fuel rods is supported by a fuel supporting portion of a lower tie plate. The fuel supporting portion includes a plurality of second coolant paths for supplying a coolant from below the fuel supporting portion to a first coolant path defined above the fuel supporting portion and between the fuel rods. The total cross-sectional area of all the second coolant paths is smaller than the cross-sectional area of the first coolant path. A water rod disposed between the fuel rods each includes an ascending tube path having therein a coolant ascending path having a coolant inlet port opening to a region below the fuel supporting portion, for guiding upward the coolant supplied through the coolant inlet port, and a descending tube having therein a coolant descending path having a coolant delivery port opening to said first coolant path, for guiding downward the coolant guided by said coolant ascending path and discharging the coolant through the coolant delivery port to the first coolant path. The descending tube path is so disposed outside the ascending tube path as to define a gap, through which the coolant inside the first coolant path flows, between it and the ascending tube path.

Fuel assembly and nuclear reactor

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Hitachi, Japan

Masahisa Inagaki