A metal microparticle coated with metal nanoparticles is disclosed. Some variations provide a material comprising a plurality of microparticles (1 micron to 1 millimeter) containing a metal or metal alloy and coated with a plurality of nanoparticles (less than 1 micron) or nanoparticle inclusions (potentially larger than 1 micron). The invention eliminates non-uniform distribution of sintering aids by attaching them directly to the surface of the microparticles. No method is previously known to exist which can assemble nanoparticle inclusions onto the surface of a metal microparticle. Some variations provide a solid article comprising a material with a metal or metal alloy microparticles coated with metal hydride or metal alloy nanoparticles, wherein the nanoparticles form continuous or periodic inclusions at or near grain boundaries within the microparticles.

An aluminum based composite material includes an aluminum parent phase and dispersions dispersed in the aluminum parent phase and formed such that a portion or all of additives react with aluminum in the aluminum parent phase, an average particle diameter of the dispersions is 20 nm or less, a content of the dispersions is 0.25% by mass or more and 0.72% by mass or less in terms of carbon amount, and an interval between the dispersions adjacent to each other is 210 nm or less.

A method of manufacturing an object is disclosed. In some aspects, the method includes selectively heating an initial layer of a composition, including elements of a granular material coated with a metallic material. The method further includes selectively heating an additional layer of the composition, disposed in contact with the initial layer, the selective heating of each respective layer to the threshold temperature actuating an exothermic reaction between the elements of the granular material and the metallic material coating associated therewith to form a molten portion of the respective layer, with turbulence in the molten portion of the respective layer disrupting oxidation of the molten granular material and promoting formation of an intermetallic compound in the molten portion of the respective layer upon cooling thereof below the threshold temperature, and with the portions of the respective layers combining to form the object.

A method of manufacturing an object is disclosed. In some aspects, the method includes selectively heating an initial layer of a composition, including elements of a granular material coated with a metallic material. The method further includes selectively heating an additional layer of the composition, disposed in contact with the initial layer, the selective heating of each respective layer to the threshold temperature actuating an exothermic reaction between the elements of the granular material and the metallic material coating associated therewith to form a molten portion of the respective layer, with turbulence in the molten portion of the respective layer disrupting oxidation of the molten granular material and promoting formation of an intermetallic compound in the molten portion of the respective layer upon cooling thereof below the threshold temperature, and with the portions of the respective layers combining to form the object.

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.

The present invention discloses rare earth-bonded magnetic powder and a preparation method therefor. The bonded magnetic powder is of a multilayer core-shell structure, and comprises a core layer and an antioxidant layer (3), wherein the core layer is formed by RFeMB, R is Nd and/or PrNd, and M is one or more of Co, Nb, and Zr; and the core layer is coated with an iron-nitrogen layer (2). In addition, the present invention also discloses the preparation method for the rare earth-bonded magnetic powder and a bonded magnet. The oxidation and corrosion of magnetic raw powder during phosphorization and subsequent treatment process are effectively prevented, thereby further improving the long-term temperature resistance and environmental tolerance of the material.

The present invention discloses rare earth-bonded magnetic powder and a preparation method therefor. The bonded magnetic powder is of a multilayer core-shell structure, and comprises a core layer and an antioxidant layer (3), wherein the core layer is formed by RFeMB, R is Nd and/or PrNd, and M is one or more of Co, Nb, and Zr; and the core layer is coated with an iron-nitrogen layer (2). In addition, the present invention also discloses the preparation method for the rare earth-bonded magnetic powder and a bonded magnet. The oxidation and corrosion of magnetic raw powder during phosphorization and subsequent treatment process are effectively prevented, thereby further improving the long-term temperature resistance and environmental tolerance of the material.

A high-quality porous aluminum sintered compact, which can be produced efficiently at a low cost; has an excellent dimensional accuracy with a low shrinkage ratio during sintering; and has sufficient strength, and a method of producing the porous aluminum sintered compact are provided. The porous aluminum sintered compact is the porous aluminum sintered compact (10) that includes aluminum substrates (11) sintered to each other. The junction (15), in which the aluminum substrates (11) are bonded to each other, includes the Ti—Al compound (16) and the Mg oxide (17). It is preferable that the pillar-shaped protrusions projecting toward the outside are formed on outer surfaces of the aluminum substrates (11), and the pillar-shaped protrusions include the junction (15).

A high-quality porous aluminum sintered compact, which can be produced efficiently at a low cost; has an excellent dimensional accuracy with a low shrinkage ratio during sintering; and has sufficient strength, and a method of producing the porous aluminum sintered compact are provided. The porous aluminum sintered compact is the porous aluminum sintered compact (10) that includes aluminum substrates (11) sintered to each other. The junction (15), in which the aluminum substrates (11) are bonded to each other, includes the Ti—Al compound (16) and the Mg oxide (17). It is preferable that the pillar-shaped protrusions projecting toward the outside are formed on outer surfaces of the aluminum substrates (11), and the pillar-shaped protrusions include the junction (15).

The present invention relates to a method for preparing ferrite/reducing metal composite particles and a method for preparing a high temperature resistant stealth coating based on 3D laser printing, belonging to the technical field of preparation of absorbing coatings. The present invention aims to solve the problems that an existing high-temperature absorbing coating has insufficient coating/matrix bonding force, the microstructure of the coating is difficult to control, and electromagnetic properties cannot be ensured. In the present invention, nano ferrite powder and nano reducing metal powder are prepared into composite particles by a mixing granulation process. In a sealed preparation chamber of a 3D printing device, composite particles are subjected to laser-induced in-situ reaction on the surface of a substrate to prepare a high temperature resistant stealth coating. The present invention is applied to high temperature resistance and stealth of components and prevention and control of electromagnetic pollution.