Toyo Tanso Co., Ltd.

Toshiaki Sogabe

Naoto Ohta

Tetsuro Tojo

Osamu Okada

Hiroaki Ogura

Teruhisa Kondo

Toshiharu Hiraoka

Masatoshi Yamaji

Hiroshi Okubo

Akira Asari

Osamu Fukunaga

Katsuhide Nagaoka

Yumi Ohnishi

Kyoko Noro

Hisanori Shinohara

Kazuhito Hoshi

Hidehiko Nozaki

A method for producing a semiconductor diamond containing boron by the high pressure synthesis method, wherein a graphite material to be converted to the semiconductor diamond is mixed with boron or a boron compound, formed and fired, in such a way that the resultant graphite material contains a boron component uniformly dispersed therein and has an enhanced bulk density, a high purity and a reduced content of hydrogen.

Graphite material for synthesizing semiconductor diamond and semiconductor diamond produced by using the same

The invention provides an anode material for lithium ion secondary battery using a coated graphite powder as a raw material, which is coated thermoplastic resin of a carbonization yield of &#x2266;20 wt % in a proportion of &#x2266;10 parts by weight the carbonized material per 100 parts by weight graphite powder. Coating with thermoplastic resin increases the accumulative pore volume by &#x2266;5%, relative to the uncoated powder, and results in pore sizes of 0.012-40 &#x3bc;m via mercury porosimeter method. Calculated with the BJH method as viewed from desorption isotherm, the coated graphite powder has a mesopore volume &#x2266;0.01 cc/g or &#x2266;60% of the pore volume of the uncoated graphite powder. This coated powder also has an average particle size ranging from 10-50 &#x3bc;m measured by a laser-scattering-particle-size-distribution measuring device, and a standard deviation to the average particle size (&#x3c3;/D) ratio of &#x2266;0.02.

Anode material for lithium ion secondary battery

An oxidation resistant carbon fiber reinforced carbon composite material comprises a matrix and 20 volume % or more of carbon fibers, and is characterized in that: the matrix contains ceramic powder that includes boron carbide powder having an average particle diameter of 5 &#x3bc;m or less; and an amount of the ceramic powder is 32 volume % or more based on volume of the carbon fibers.

Oxidation resistant carbon fiber reinforced carbon composite material and process for producing the same

A carbon material for producing endohedral metallofullerenes in a high yield is made of a mixture of a metal or metal compound with a carbonaceous material and is used in producing a endohedral metallofullerenes, wherein said carbon material contains a metal carbide and a bulk density of said carbon material is set to 1.80 g/cmor less.

Carbon material for producing metal-including fullerene in high yield

High purity carbon fiber reinforced carbon composites and manufacturing apparatus for use thereof

A carbon fiber reinforced carbon composite, obtained by a method comprising impregnating a pitch or a resin into a molded member formed of carbon fibers for densification thereof; forming an impregnated pyrolytic carbon layer by CVI after densification; and forming a coated pyrolytic carbon layer on the impregnated pyrolytic carbon layer by CVD; a method of making the carbon fiber reinforced carbon composite; and a pulling single crystal member made from the carbon fiber reinforced carbon composite.

Carbon fiber reinforced carbon composite and useful as components for pulling single crystal apparatus

Since the dense and high purity pyrolytic-carbon-coated layer is formed with a thickness of 10-100 &mgr;m on the surface of the C/C composite, even when metallic impurities of the inside C/C composite are 5-100 ppm in ash content, similar effects to those of a known crucible made of the C/C composite whose inside was subjected to high purification can be produced to achieve full applicability to the structural elements of the CZ apparatus. Also, since the process time required or the C/C composite itself to be subjected to the high purification can be shortened, the effect of reducing the manufacturing costs considerably can be obtained.

Pyrolytic carbon coated carbon fiber reinforced carbon composite and useful as components for pulling single crystal apparatus

An oxidation resistant carbon material including a composite material is provided. The composite material is obtained by impregnating a carbon material with a boron oxide and/or a hydrate compound thereof, and baking such carbon material under pressure by inert gas at a temperature of not lower than 1500.degree. C.

Method for producing composite material mainly composed of carbon and

There is provided according to the invention a method for producing a composite material mainly composed of a carbon and boron comprising the steps of impregnating a carbon material with a boron oxide and/or a hydrate compound thereof, and baking such carbon material under pressure by inert gas at a temperature of not lower than 1500.degree. C. A neutron absorbent and an oxidation resistant carbon material both including the composite material are also provided.

A neutron absorbent including a composite material is provided. The composite material is obtained by impregnating a carbon material with a boron oxide and/or a hydrate compound thereof, and baking such carbon material under pressure by inert gas at a temperature of not lower than 1500.degree. C.

Growing community of inventors

Kagawa, Japan

Toshiaki Sogabe