Abstract:
In production of a titanium alloy spherical powder by a gas atomizing method, the difference in alloy composition depending on the product particle size is reduced economically. To achieve this, sponge titanium particles and additive metal element particles are mixed by means of a mixer having a pulverizing function such as a ball mill. The mixed particles are compressed to form a rod-formed raw material for melting. The formed rod-formed raw material for melting is powderized by a gas atomizing method. In the mixing step, the additive metal element particles are pulverized, or ground depending on the kind of particles, and solidly adhered to the surface of the sponge titanium particles, so that uniform mixing is possible.
Abstract:
In a method for preparing a silicon monoxide vapor deposition material wherein a mixture of a silicon powder and a silicon dioxide powder is heated and reacted in a raw material chamber under vacuum to generate a silicon monoxide gas and silicon monoxide is precipitated on a precipitation substrate in a precipitation chamber provided above the raw material chamber, an improvement which comprises using, as the precipitation substrate, a cylindrical body wherein a circumference wall is inclined from the perpendicular by 1 to 45 degrees and the inner diameter of the upper end thereof is smaller than that of the lower end, and effecting the precipitation under a vacuum of 7 Pa to 40 Pa. The method allows the preparation of a silicon monoxide vapor deposition material exhibiting a weight reduction rate in the rattler test a rattler value of 1.0 % or less and being reduced in the occurrence of the splash phenomenon during the formation of a silicon monoxide vapor deposition film.
Abstract:
Provided is a sputtering target which can give a high water barrier property and a high flexibility to a sputtering film, can keep a high film forming rate certainly in sputtering, and can make damages to an objective substance wherein a film is to be formed as small as possible. In order to realize this, a mixed powder which contains 20 to 80% by weight of a SiO powder, the balance of the powder being made of a TiO 2 powder and/or a Ti powder, is pressed and sintered. The sintered body has a composition of SiαTiβOγ wherein α, β and γ are mole ratios of Si, Ti and O, respectively, and the ratio of α/β ranges from 0.45 to 7.25 and the ratio of γ/(α + β) ranges from 0.80 to 1.70.
Abstract:
An object of the present invention is to provide a silicon monoxide gas generating raw material in which a reaction that generates a silicon monoxide (SiO) gas is hardly inhibited. The silicon monoxide gas generating raw material according to the present invention has a water content of 0.6 wt % or less.
Abstract:
In a lithium ion secondary battery using a negative electrode material powder including a lower silicon oxide powder as a negative electrode material, a charge electric potential at 0.45-1.0 V relative to a Li reference upon initial charging results in a lithium ion secondary battery having a large discharge capacity with excellent cycle characteristics, which can be durable in practical use. On this occasion, the charge electric potential being 0.45-1.0 V relative to the Li reference upon initial charging means that an electric potential plateau caused by the generation of Li-silicate is observed, and the Li-silicate is uniformly generated in the negative electrode material. The negative electrode material powder according to the present invention having the charge electric potential of 0.45-1.0 V relative to the Li reference upon initial charging prevents the negative electrode material from being finely torn apart upon charging/discharging which results in cycle characteristic degradation, and excellent cycle characteristics are obtained. It is preferable for the negative electrode material powder according to the present invention to have an electrically conductive carbon film on the surface, and for the ratio of the electrically conductive carbon film to the surface of the powder to be 0.2-10 mass %.
Abstract:
Provided is a negative-electrode material powder used for a lithium-ion secondary battery having a large discharge capacity and sufficient cycle characteristics as being durable in use. The powder for the battery includes a conductive carbon film on a lower silicon oxide powder, surface and satisfies requirements that: Si in SiC is 15.1 wt% or less in content, or A3 (=A2-A1) is 15.1 or less, given A1 (wt%): Si content measured by acid solution process, and A2 (wt%): Si content measured by alkali solution process; and a specific resistance is 30,000 Ωcm or less. In the lower silicon oxide powder, a maximum value P1 of SiO x -derived halos appearing at 2θ=10° to 30° and a value P2 of the strongest line peak of Si (111) appearing at 2θ=28.4±0.3°, in XRD using CuKα beam, preferably satisfy P2/P1
Abstract:
Provided is a silicon oxide to be used for a negative electrode active material of a lithium-ion secondary battery, characterized in that : a g-value measured by an ESR spectrometer is in the range of not less than 2.0020 to not more than 2.0050; and given that A, B, and C are the area intensities of peaks near 420 cm -1 , 490 cm -1 and 520 cm -1 respectively in a Raman spectrum measured by a Raman spectroscopy, A/B is not less than 0.5 and C/B is not more than 2. The silicon oxide is used as a negative electrode active material, whereby a lithium-ion secondary battery having excellent cycle characteristic and initial efficiency in addition to high capacity can be obtained. The silicon oxide preferably has a spin density in the range of not less than 1×10 17 spins/g to not more than 5×10 19 spins/g. A negative electrode material for lithium-ion secondary battery contains not less than 20% by mass of this silicon oxide as a negative electrode active material.
Abstract:
Disclosed is an SiO deposition material characterized by having a hydrogen gas content of not more than 50 ppm. By using such an SiO deposition material, occurrence of splash can be suppressed when SiO is deposited on a base, and there can be formed an SiO deposited film which is excellent in transparency and barrier properties. By carrying out degasification so that the hydrogen gas content of a raw material Si powder for the deposition material is not more than 10 ppm, the SiO deposition material having a hydrogen gas content of not more than 50 ppm can be produced highly efficiently at low cost. Consequently, this method for producing SiO can be widely applied to methods for producing deposition materials for packaging materials which have transparency and barrier properties and are used for foods, medical products, medicinal products and the like.
Abstract:
Provided are a porous sintered compact suitable for a filter, a power feeder in a polymer electrolyte membrane type water electrolyzer, a current collector in a solid polymer fuel cell and in addition a liquid dispersion plate, especially an ink dispersion plate for an ink jet printer ink and the like. A titanium powder sintered compact made of a plate-like porous compact is obtained by sintering spherical powder made of titanium or a titanium alloy produced by means of a gas atomization method. A void ratio in the range of from 35 to 55% is realized by filling without applying a pressure and sintering without applying a pressure.
Abstract:
The present invention provides a method by which a metal-fog-forming metal dissolved in one portion of "a molten salt mixture consisted of one or more of metal-fog-forming metal containing molten salts" (generally, a molten salt) can be removed and transferred to another portion of the molten salt to increase the concentration thereof. The method can hence be utilized as one of means for treating molten salts in various industrial fields in which metal-fog-forming metal-containing molten salts such as Ca or Na are handled. In particular, when the method is utilized in producing Ti by Ca reduction, the Ca dissolved in the molten salt to be fed to an electrolytic cell can be rapidly removed (recovered) and the Ca formation efficiency during the electrolysis of the molten salt can be enhanced. Consequently, Ca formation and TiCl 4 reduction in the electrolysis of the molten salt can be efficiently carried out and a stable operation on a commercial scale is possible. Thus, the method can be efficiently utilized in producing Ti or a Ti alloy by Ca reduction.