Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing an oxide-dispersed alloy in an ideal state where metal oxide is more finely dispersed. SOLUTION: The method for producing an oxide-dispersed alloy in which dispersion grains composed of the oxide of one or more kinds of additional metals are dispersed into a base phase metal(s) comprises: a stage (a) where alloy powder or alloy wire rod composed of a base phase metal(s) and an additional metal(s) is produced; a stage (b) where the alloy powder or alloy wire rod is introduced into a high energy ball mill together with water, and stirring is performed, thus the additional metal(s) in the alloy powder is oxidized with the water, so as to form dispersion grains; and a stage (c) where the alloy powder or alloy wire rod after the oxidation is compacted. The invention is particularly useful for producing an oxide-dispersed alloy in which the oxide formation free energy of the base phase metal(s) is higher than the standard formation free energy of water, and the oxide formation free energy of the additional metal(s) is lower than the standard formation free energy of water. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a heat-resistant alloy which has a similar composition to Inconel (R)713C, and can be formed into fine powder to be metal-injection-molded with a spray method. SOLUTION: This heat-resistant alloy comprises, by mass%, 0.08-0.20% C, 0-0.25% Mn, 0-0.015% S, 0.2-1.0% Si, 12.0-14.0% Cr, 3.80-5.20% Mo, 0-0.1% Ti, 5.50-6.50% Al, 2.58-4.74% Nb, 0-2.5% Fe, 0.05-0.15% Zr, 0-0.015% B, 0-1.00% Co, and the balance Ni with unavoidable impurities. Because the alloy has the composition which substitutes Nb for Ti in Inconel 713C and does not include Ti, it does not cause clogging during teeming in process of producing the fine powder with the spray method. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
Methods for preparing solid metal oxide nanoparticles via controlled oxidation comprising preparing a plurality of metal nanoparticles, contacting the plurality of metal nanoparticles with an aqueous agent to provide metal oxide nanoparticles having a desired particle size, and removing the resulting metal oxide nanoparticles from the aqueous agent. Aspects of the present disclosure also relate to solid metal oxide nanoparticles obtained by this method.
Abstract:
A metal powder additive manufacturing system (100) and method are disclosed that use increased trace amounts of oxygen to improve physical attributes of an object. The system (100) may include: a processing chamber (130); a metal powder bed (132) within the processing chamber (130); a melting element (134) configured to sequentially melt layers of metal powder on the metal powder bed (132) to generate an object (102); and a control system (104) configured to control a flow of a gas mixture (160) within the processing chamber (130) from a source of inert gas (154) and a source of an oxygen containing material (162), the gas mixture (160) including the inert gas (154) and oxygen from the oxygen containing material (162).
Abstract:
A method for manufacturing a powder magnetic core using a soft magnetic material powder, wherein the method has: a first step of mixing the soft magnetic material powder with a binder, a second step of subjecting a mixture obtained through the first step to pressure forming, and a third step of subjecting a formed body obtained through the second step to heat treatment. The soft magnetic material powder is an Fe-Cr-Al based alloy powder comprising Fe, Cr and Al. An oxide layer is formed on a surface of the soft magnetic material powder by the heat treatment. The oxide layer has a higher ratio by mass of Al to the sum of Fe, Cr and Al than an alloy phase inside the powder.
Abstract:
An interconnector for a solid oxide fuel cell is manufactured by single-press compacting a powder blend to form a green interconnector with a desired shape of a final interconnector. The powder blend includes chromium and iron, and may include an organic lubricant. At least 50 wt% or more of an iron portion of the powder blend comprises iron particles smaller than 45 urn. The green interconnector is then sintered and oxidized to form the final interconnector. The oxidation step occurs in a continuous flow furnace in which a controlled atmosphere (e.g., humidified air) is fed into the furnace in the travel direction of the interconnector. The final interconnector comprises at least 90 wt% chromium, at least 3 wt% iron, and less than 0.2 wt% nitrogen. An average density within a flow field of the final interconnector may be less than 6.75 g/cc.