Abstract:
The present invention relates to nanocomposites based on graphitized and porous carbon forms wherein metal nanoparticles in zero oxidation state are embedded. Furthermore, it also relates to the preparation process of said nanocomposites, initiated with the synthesis of a layered hydroxide as precursor and the subsequent calcination thereof in very mild temperature conditions. The nanocomposite thus produced has supercapacitance and magnetoresistance properties, which make it suitable for different applications in energy storage, in electronics and in spintronics.
Abstract:
Methodologies, systems, and devices are provided for producing metal spheroidal powder products. Dehydrogenated and spheroidized particles are prepared using a process including introducing a metal hydride feed material into a plasma torch. The metal hydride feed material is melted within a plasma in order to dehydrogenate and spheroidize the materials, forming dehydrogenated and spheroidized particles. The dehydrogenated and spheroidized particles are then exposed to an inert gas and cooled in order to solidify the particles into dehydrogenated and spheroidized particles. The particles are cooled within a chamber having an inert gas.
Abstract:
In a finish heat treatment method and finish heat treatment apparatus for an iron powder, a raw iron powder is placed on a continuous moving hearth and continuously charged into the apparatus. In the pretreatment zone, the raw iron powder is subjected to a pretreatment of heating the raw iron powder in an atmosphere of hydrogen gas and/or inert gas at 450 to 1100°C. In decarburization, deoxidation, and denitrification zones, the pretreated iron powder is subsequently subjected to at least two treatments of decarburization, deoxidation, and denitrification. In the pretreatment zone, a hydrogen gas and/or an inert gas serving as a pretreatment ambient gas is introduced separately from an ambient gas used in the at least two treatments is introduced from the upstream side of the pretreatment zone and released from the downstream side so as to flow in the same direction as a moving direction of the moving hearth.
Abstract:
A method for producing a rare-earth magnet includes a provision step of providing a Sm-Fe-based alloy containing a SmFe 9+α phase serving as a main phase by rapidly cooling a molten alloy containing Sm and Fe in an atomic ratio of 1:8.75 to 1:12, a hydrogenation-disproportionation step of subjecting the Sm-Fe-based alloy to hydrogenation-disproportionation treatment to allow part of the SmFe 9+α phase (α = 0.1 to 3.0) to undergo phase decomposition into SmH 2 and Fe, a formation step of pressure-forming the Sm-Fe-based alloy that has been subjected to the hydrogenation-disproportionation treatment to provide a formed article, a desorption-recombination step of subjecting the formed article to desorption-recombination treatment to allow the SmH 2 and the Fe provided by phase decomposition in the hydrogenation-disproportionation treatment to recombine, and a nitriding step of subjecting the formed article that has been subjected to the desorption-recombination treatment to nitriding treatment, in which when the Sm-Fe-based alloy obtained in the provision step is subjected to X-ray diffraction, the integrated intensity ratio of the integrated intensity Int(Fe) of a diffraction peak arising from the α-Fe(110) plane to the integrated intensity Int(SmFe) of a maximum diffraction peak arising from a compound of Sm and Fe is 1/9 or less in a range of 2θ = 30° to 50°.
Abstract:
A high quality porous aluminum body, which has excellent joint strength between the porous aluminum body and the aluminum bulk body, and a method of producing the porous aluminum complex, are provided. The porous aluminum complex (10) includes: a porous aluminum body (30) made of aluminum or aluminum alloy; and an aluminum bulk body (20) made of aluminum or aluminum alloy, the porous aluminum body (30) and the aluminum bulk body (20) being joined each other. The junction (15) between the porous aluminum body (30) and the aluminum bulk body (20) includes a Ti-Al compound. It is preferable that pillar-shaped protrusions (32) projecting toward the outside are formed on outer surfaces of one of or both of the porous aluminum body (30) and the aluminum bulk body (20), and the pillar-shaped protrusions (32) include the junction (15).
Abstract:
The invention relates to a method for the additive manufacture of three-dimensional metallic components (12), these components (12) being built layer-by-layer or section-by-section under vacuum conditions using a laser (20), by fusing a metal powder with the component (12). In order to reduce production of surplus metal powder during machining, it is suggested that the metal powder is fed to and mixed with a gas stream, said gas stream being fed to the region of a machining point of the laser (20) on the surface of said component.
Abstract:
A step of, while a powder of an RLM alloy (where RL is Nd and/or Pr; M is one or more elements selected from among Cu, Fe, Ga, Co, Ni and Al) and a powder of an RH compound (where RH is Dy and/or Tb; and the RH compound is one, or two or more, selected from among an RH fluoride, an RH oxide, and an RH oxyfluoride) are present on the surface of a sintered R-T-B based magnet, performing a heat treatment at a sintering temperature of the sintered R-T-B based magnet or lower is included. The RLM alloy contains RL in an amount of 65 at% or more, and the melting point of the RLM alloy is equal to or less than the temperature of the heat treatment. The heat treatment is performed while the RLM alloy powder and the RH compound powder are present on the surface of the sintered R-T-B based magnet at a mass ratio of RLM alloy: RH compound = 9.6:0.4 to 5:5.
Abstract:
The invention relates to a method for forming powder particles, wherein the method comprises feeding a start material mixture including more than one constituents in the form of granules into a reactor comprising a reaction zone and a heat source, performing thermal synthesis in the reaction zone in which the start material mixture is moved and the constituents of the start material mixture react in the presence of heat so that the reaction is started by means of heat of the reactor and energy of the start material mixture is released in the form of heat in order to achieve the reaction, and producing powder particles during the reaction. Further, the invention relates to a powder particle product.
Abstract:
The present invention provides a producing method of R-T-B-based sintered magnets in which, the recovery chamber 40 includes inert gas introducing means 42, evacuating means 43, a carry-in port, a discharge port 40a, and a recovery container 60. The recovery step includes a carrying-in step of conveying a processing container 50 into the recovery chamber 40, a discharging step of discharging coarsely pulverized powder in the processing container 50 into the recovery chamber 40, a gas introducing step of introducing inert gas into the recovery chamber 40, and an alloy accommodating step of recovering the coarsely pulverized powderinto the recovery container 60. Addition of pulverization aid is carried out in the alloy accommodating step. A remaining amount of coarsely pulverized powder in the recovery chamber 40, an oxygen-containing amount of the R-T-B-based sintered magnet is reduced, and magnetic properties are enhanced.
Abstract:
A thermoelectric material contains as a major ingredient a magnesium silicon alloy, a magnesium silicon tin alloy, a silicon or a silicon germanium alloy, and includes a porous body with a large number of pores.