Kabushiki Kaisha Toshiba

Toshiba Materials Co., Ltd.

Keiichi Fuse

Katsuhiko Yamada

Akira Sato

Shinya Kasamatsu

Tsuyoshi Kobayashi

Shinya Sakurada

Yasuhiro Shirakawa

Kayo Nakano

Akito Sasaki

Masami Okamura

Tadahiko Kobayashi

Takao Sawa

Masaya Hagiwara

Yosuke Horiuchi

Masaki Endo

Naoyuki Sanada

Yumi Ito

Satoru Habu

In one embodiment, an antibacterial material includes at least one microparticles selected from tungsten oxide microparticles and tungsten oxide complex microparticles. The microparticles, which have undergone a test to evaluate viable cell count by inoculating in a test piece, to which the microparticles are adhered in a range of 0.02 mg/cmor more and 40 mg/cmor less, at least one bacterium selected from among, methicillin-resistant, and enterohemorrhagic, and storing for 24 hours, have an antibacterial activity value R of 0.1 or more expressed by the following: R=log(B/C) where, Bdenotes an average value (number) of viable cell count after storing an untreated test piece for 24 hours, and Cdenotes an average value (number) of viable cell count after storing the test piece on which the microparticles are coated for 24 hours.

Antibacterial material and antibacterial film and antibacterial member using the same

A rare earth regenerator material particle and a regenerator material particle group having a high long-term reliability, and a superconducting magnet, an examination apparatus, a cryopump and the like using the same are provided. A rare earth regenerator material particle contains a rare earth element as a constituent component, and in the particle, a peak indicating a carbon component is detected in a surface region by an X-ray photoelectron spectroscopy analysis.

Rare earth regenerator material particle, rare earth regenerator material particle group, and cold head, superconducting magnet, examination apparatus, and cryopump using the same

A refrigerator is provided, including rare earth cold accumulating material particles filled in a cold accumulating vessel. The rare earth cold accumulating material particles are a rare earth oxide or a rare earth oxysulfide. The rare earth cold accumulating material particles define a sintered body. An average crystal grain size of the sintered body is 0.5 to 5 &#x3bc;m, a porosity of the sintered body is 10 to 50 vol. %, and an average pore size of the sintered body is 0.3 to 3 &#x3bc;m. In an arbitrary cross-section of the rare earth cold accumulating material particles, a number of pores per a unit area of 10 &#x3bc;m&#xd7;10 &#x3bc;m is 20 to 70.

Refrigerator including rare earth cold accumulating material particles, and superconducting magnet, inspection device and cryopump using same

A reduction in a permeability of refrigerant gas is suppressed while increasing a filling factor of regenerator material particles with respect to a stage of a cold head. A cold head includes a stage including regenerator material particle groups, and a metal mesh material partitioning the regenerator material particle groups. The metal mesh material has quadrangular mesh holes each having a length of a long side of 1/10 or more and &#xbd; or less of each of average particle sizes of the regenerator material particle groups.

Cold head, superconducting magnet, examination apparatus, and cryopump

The present invention provides a rare earth cold accumulating material particle comprising a rare earth oxide or a rare earth oxysulfide, wherein the rare earth cold accumulating material particle is composed of a sintered body; an average crystal grain size of the sintered body is 0.5 to 5 &#x3bc;m; a porosity of the sintered body is 10 to 50 vol. %; and an average pore size of the sintered body is 0.3 to 3 &#x3bc;m. Further, it is preferable that the porosity of the rare earth cold accumulating material particle is 20 to 45 vol. %, and a maximum pore size of the rare earth cold accumulating material particle is 4 &#x3bc;m or less. Due to this structure, there can be provided a rare earth cold accumulating material having a high refrigerating capacity and a high strength.

Rare earth cold accumulating material particles, and refrigerator, superconducting magnet, inspection device and cryopump using same

The present invention provides a rare earth cold accumulating material particle comprising a rare earth oxide or a rare earth oxysulfide, wherein the rare earth cold accumulating material particle is composed of a sintered body; an average crystal grain size of the sintered body is 0.5 to 5 &#x3bc;m; a porosity of the sintered body is 10 to 50 vol. %; and an average pore size of the sintered body is 0.3 to 3 &#x3bc;m. Further, it is preferable that the porosity of the rare earth cold accumulating material particle is 20 to 45 vol. %, and a maximum pore size of the rare earth cold accumulating material particle is 4 m or less. Due to this structure, there can be provided a rare earth cold accumulating material having a high refrigerating capacity and a high strength.

Provided is a group of rare-earth regenerator material particles having an average particle size of 0.01 to 3 mm, wherein the proportion of particles having a ratio of a long diameter to a short diameter of 2 or less is 90% or more by number, and the proportion of particles having a depressed portion having a length of 1/10 to &#xbd; of a circumferential length on a particle surface is 30% or more by number. By forming the depressed portion on the surface of the regenerator material particles, it is possible to increase permeability of an operating medium gas and a contact surface area with the operating medium gas.

Rare-earth regenerator material particles, and group of rare-earth regenerator material particles, refrigerator and measuring apparatus using the same, and method for manufacturing the same

A permanent magnet of the embodiment includes: a composition represented by a composition formula: R(FeMCuCCo)(R is at least one element selected from rare-earth elements, M is at least one element selected from Ti, Zr and Hf, 0.27&#x2264;p&#x2264;0.45, 0.01&#x2264;q&#x2264;0.05, 0.01&#x2264;r&#x2264;0.1, 0.002&#x2264;t&#x2264;0.03, and 6&#x2264;z&#x2264;9); and a metallic structure including a main phase containing a ThZncrystal phase, and a sub phase of the element M having an element M concentration of 30 atomic % or more. The sub phase of the element M precipitates in the metallic structure. A ratio of a circumferential length to a precipitated area of the sub phase of the element M is 1 or more and 10 or less.

Growing community of inventors

Yokohama, Japan

Keiichi Fuse