摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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 ≦20 wt % in a proportion of ≦10 parts by weight the carbonized material per 100 parts by weight graphite powder. Coating with thermoplastic resin increases the accumulative pore volume by ≦5%, relative to the uncoated powder, and results in pore sizes of 0.012-40 μm via mercury porosimeter method. Calculated with the BJH method as viewed from desorption isotherm, the coated graphite powder has a mesopore volume ≦0.01 cc/g or ≦60% of the pore volume of the uncoated graphite powder. This coated powder also has an average particle size ranging from 10-50 μm measured by a laser-scattering-particle-size-distribution measuring device, and a standard deviation to the average particle size (σ/D) ratio of ≦0.02.
摘要:
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 μm or less; and an amount of the ceramic powder is 32 volume % or more based on volume of the carbon fibers.
摘要:
A high-purity carbon fiber reinforced carbon composite formed by a process which entails graphitizing a molded member packed with carbon fibers, which fibers are subjected to a purification process under halogen gas prior to being graphitized and prior to being packed with a matrix of carbon material, and the matrix of carbon material, the carbon fiber reinforced carbon composite having an impurities content of not more than 30 ppm in ash content and satisfies either or both of the following conditions for impurities: (1) V is not more than 0.12 ppm by ICP-OES; and (2) Fe is not more than 0.10 ppm by ICP-OES.
摘要:
The invention provides an anode material for lithium ion secondary battery using a coated graphite powder as a raw material. The coated graphite powder is coated with carbonized material of thermoplastic resin of a carbonization yield of not more than 20 wt % in a proportion of not more than 10 parts by weight the carbonized material per 100 parts by weight graphite powder. The graphite powder as coated with thermoplastic resin increases 5% or more in accumulative pore volume of the graphite powder having a pore size of 0.012 μm to 40 μm as measured by a mercury porosimeter method, as compared with the graphite powder before coated with the thermoplastic resin. The coated graphite powder has a mesopore volume defined by IUPAC of 0.01 cc/g or less as calculated with the BJH method as viewed from desorption isotherm, which is also equal to 60% or less of the pore volume of the graphite powder before coated with the thermoplastic resin, an average particle size ranging from 10 μm to 50 μm, as measured by a laser-scattering-particle-size-distribution measuring device, and a ratio of standard deviation to the average particle size (σ/D) of 0.02 or less.
摘要:
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 μm or less; and an amount of the ceramic powder is 32 volume % or more based on volume of the carbon fibers.
摘要:
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.
摘要:
A generating system having a rotating type generator to interconnect a power system in order to output power of the generator to the power system comprises a generator, an exciting circuit and an excitation control section. It also comprises short-cycle stabilizing sections for outputting a short-cycle stabilizing signal for suppressing short-cycle power fluctuations according to at least one of an electric parameter and a mechanical parameter of the generator and a long-cycle stabilizing section for outputting a long-cycle stabilizing signal for suppressing long-cycle power fluctuations having a cycle time longer than short-cycle power fluctuations according to the mechanical parameter of the generator. The outputs of the short-cycle stabilizing sections and the long-cycle stabilizing section are sent to the excitation control section.