Abstract:
A process for manufacturing alloy powder with dual consumable rotary electrodes arc melting is suitable for manufacturing pure and low-surface-area powder of metal, active metals and their alloys. In the process, rotary electrode and tungsten electrode adopted by conventional rotary electrode and arc process for manufacturing powder are respectively replaced with a rotary or anodic electrode containing a first metal and a feed or cathodic electrode containing a second metal. An inert gas is supplied into equipment for implementing the process to serve as a protective atmosphere and stabilize generated electric arc. The cathodic electrode melts under the high temperature of the arc at a cathodic spot, and droplets of the molten cathodic or second metal are sprayed toward the anodic electrode to mix with molten anodic or first metal and thrown-out by a centrifugal force of the rotary electrode to produce round-shaped alloy powder containing the first and the second metal.
Abstract:
An apparatus may include a nonthermal plasma reactor vessel, a gaseous core precursor inlet, a gaseous shell precursor inlet, and a plasma source. The reactor vessel may include a core formation region and a shell formation region downstream of the core formation region. The gaseous core precursor inlet may be upstream of the core formation region and configured to introduce gaseous core precursors to the reactor vessel. The gaseous shell precursor inlet may be downstream of the core formation region, upstream of the shell formation region, and configured to introduce gaseous shell precursors to the reactor vessel. The plasma source may be configured to produce a plasma in the core formation region and the shell formation region. The gaseous core precursors may form negatively-charged core nanoparticles in the core formation region. The gaseous shell precursors may form shells on the core nanoparticles in the shell formation region.
Abstract:
A BÏ2212 article may be formed by mixing metallic precursor powders including bismuth, strontium, calcium and copper in an oxygen-free atmosphere, mechanically alloying the metallic precursor powders in an oxygen-free atmosphere, and heating the metallic precursor alloy according to a temperature profile. The profile may include a ramp-up stage during which the alloy is heated to a peak temperature in an oxygen-free atmosphere, a dwell stage during which the alloy is held at the peak temperature for a dwell time, and a ramp-down stage during which the alloy is cooled from the peak temperature. During at least a portion of the dwell stage, the oxygen-free atmosphere is switched to an oxygen-inclusive atmosphere, wherein the alloy is oxidized to form a superconducting oxide, which may be sintered during or after oxidation. The alloy may be formed into a shape, such as a wire, prior to oxidizing.
Abstract:
Provided are: a permanent magnet wherein the magnetic field orientation process can be made simple and a degree of orientation thereof can be improved; a method for manufacturing a permanent magnet, an SPM motor using a permanent magnet, and a method for manufacturing an SPM motor. Raw material magnet is milled to magnet powder, and the magnet powder is mixed with a binder to form a compound. Then, the compound is molded by hot-melt molding to a green sheet in a shape of a sheet onto a supporting substrate. Thereafter, a magnetic field is applied to the green sheet thus molded to carry out magnetic field orientation. Further, with fixing plural green sheets after the magnetic field orientation by lamination under a deformed state thereof, the plural green sheets thus laminated are cut for shaping to a prescribed shape, which is followed by sintering to produce a permanent magnet.
Abstract:
The invention utilizes a carbon nano material to nanotize a magnesium-based hydrogen storage material, thereby forming single or multiple crystals to enhance the surface to volume ratio and hydrogen diffusion channel of the magnesium-based hydrogen storage material. Therefore, the hydrogen storage material has higher hydrogen storage capability, higher absorption/desorption rate, and lower absorption/desorption temperature.
Abstract:
A process for synthesizing metal nanopowders by introducing metal carbonyl into an induction plasma torch. By taking advantage of the much lower dissolution temperature of carbonyl as opposed to the high melting temperature of conventional metal powder feeds less torch power is required. Moreover, in contrast to current powder production techniques utilizing electrode based plasma torches, the induction plasma torch does not introduce contaminants into the nanopowder.
Abstract:
Suppression or enhancement of various properties of a liquid fluid is aimed by improving uniform dispersion of nanoparticles by means of making a state in which no oxidized film exists on the surfaces of the nanoparticles to be dispersed in the liquid fluid. The location of the liquid fluid is confirmed with ease by enhancing the brightness of light emission of the fluid through uniform dispersion of the nanoparticles in the liquid fluid containing a material having a flame reaction. In this way, as to liquid fluids utilized in various industries, it is possible to offer a technology to desirably enhance or suppress a property desired to be enhanced and a property desired to be suppressed among various properties that its constituents have.
Abstract:
The present invention relates to a process for producing a component composed of titanium or titanium alloy by means of MIM technology. In this process, a homogeneous mixture of boron powder having a particle size of less than 10 μm, preferably less than 5 μm, more preferably less than 2 μm, and titanium powder and/or titanium alloy powder is produced, and binder is mixed with the homogeneous mixture of boron and titanium powder and/or titanium alloy powder and also, if appropriate, an additive in a kneader, the mixture is moulded by injection moulding to produce a green part, the moulded composition is subjected to chemical and/or thermal removal of binder to produce a brown part and the composition from which the binder has been removed is sintered at a temperature in the range from 1000° C. to 1600° C.
Abstract:
A method for manufacturing alloy powders based on titanium, zirconium and hafnium alloyed with the elements Ni, Cu, Ta, W, Re, Os, and Ir is described in which an oxide of Ti and Zr and Hf is mixed with a metal powder of the elements named and with a reducing agent, and wherein this mixture is heated in a furnace, optionally under a argonate atmosphere or, optionally under hydrogen atmosphere until the reducing reaction begins, the reaction product is leached and then washed and dried, wherein the oxide used has an average grain size of 0.5 to 20 μm, a specific surface area according to BET of 0.5 20 m2/g and a minimum content of 94 wet.-%. An easy to produce powder, in particular in relation to the ignition point and burning time, is produced.
Abstract:
The invention relates to an atomized aluminum powder for thin, platelet-shaped effect pigments having a narrow relative breadth of the thickness distribution. The powder of the invention is characterized by a particle size band of d10=0.15 to 3.0 μm and d50=0.8 to 5.0 μm and also d90=2.0 to 8.0 μm. The subject matter of the invention relates additionally to a method of producing the atomized aluminum powder of the invention, and to the use of the atomized aluminum powder of the invention as a laser marking agent or laser weldability agent for plastics. The subject matter of the invention relates additionally to the use of the fine atomized aluminum powder for producing ultrathin aluminum pigments by wet milling.