The problem addressed by the present invention is providing a method for producing microparticles. At least two fluids to be processed, a raw material fluid that contains a raw material and a processing fluid that contains a substance for processing the raw material are mixed in a thin film fluid formed between at least two surfaces for processing that are disposed so as to face each other, that can approach and separate from each other and at least one of which rotates relative to the other, and microparticles of the raw material that is processed are obtained. At this time, the proportion of the microparticles of the raw material which has been processed that coalesces with each other is controlled by controlling the circumferential speed of the rotation in a confluence section in which the raw material fluid and processing fluid flow together.

The problem addressed by the present invention is providing a method for producing microparticles. At least two fluids to be processed, a raw material fluid that contains a raw material and a processing fluid that contains a substance for processing the raw material are mixed in a thin film fluid formed between at least two surfaces for processing that are disposed so as to face each other, that can approach and separate from each other and at least one of which rotates relative to the other, and microparticles of the raw material that is processed are obtained. At this time, the proportion of the microparticles of the raw material which has been processed that coalesces with each other is controlled by controlling the circumferential speed of the rotation in a confluence section in which the raw material fluid and processing fluid flow together.

Disclosed here is a method for making a nanoporous material, comprising aerosolizing a solution comprising at least one metal salt and at least one solvent to obtain an aerosol, freezing the aerosol to obtain a frozen aerosol, and drying the frozen aerosol to obtain a nanoporous metal compound material. Further, the nanoporous metal compound material can be reduced to obtain a nanoporous metal material.

Disclosed here is a method for making a nanoporous material, comprising aerosolizing a solution comprising at least one metal salt and at least one solvent to obtain an aerosol, freezing the aerosol to obtain a frozen aerosol, and drying the frozen aerosol to obtain a nanoporous metal compound material. Further, the nanoporous metal compound material can be reduced to obtain a nanoporous metal material.

The invention discloses metal powder for a 3D printer. The metal powder for 3D printers is 10-50-micron metal powder made by agglomerating many submicron order metal particles through a granulating process. As the metal powder is combined by submicron order metal particles, the metal powder is low in melting point and high in melting speed, so that the printing speed of the metal 3D printer can be increased and the precision of a printing member can be improved. Meanwhile, the average grain size of the metal powder is equivalent to existing atomized metal powder for 3D printers, and the metal powder has good dispersibility and conveying property, and can be suitable for existing 3D printer equipment.

A metallurgical system for producing metals and metal alloys includes a fluid cooled mixing cold hearth having a melting cavity configured to hold a raw material for melting into a molten metal, and a mechanical drive configured to mount and move the mixing cold hearth for mixing the raw material. The system also includes a heat source configured to heat the raw material in the melting cavity, and a heat removal system configured to provide adjustable insulation for the molten metal. The mixing cold hearth can be configured as a removal element of an assembly of interchangeable mixing cold hearths, with each mixing cold hearth of the assembly configured for melting a specific category of raw materials. A process includes the steps of providing the mixing cold hearth, feeding the raw material into the melting cavity, heating the raw material, and moving the mixing cold hearth during the heating step.

A manufacturing process includes collecting metal chips produced by a subtractive manufacturing processes and sorting the metal chips. The process further includes heating the metal chips to form a melt, removing impurities from the melt, deoxidizing the melt and atomizing the melt to form metal powder. The powder is then used to form a metal part by additive manufacturing or powder metallurgy processes.

A metallurgical system for producing metals and metal alloys includes a fluid cooled mixing cold hearth having a melting cavity configured to hold a raw material for melting into a molten metal, and a mechanical drive configured to mount and move the mixing cold hearth for mixing the raw material. The system also includes a heat source configured to heat the raw material in the melting cavity, and a heat removal system configured to provide adjustable insulation for the molten metal. The mixing cold hearth can be configured as a removal element of an assembly of interchangeable mixing cold hearths, with each mixing cold hearth of the assembly configured for melting a specific category of raw materials. A process includes the steps of providing the mixing cold hearth, feeding the raw material into the melting cavity, heating the raw material, and moving the mixing cold hearth during the heating step.

A magnesium-based alloy powder is made of a magnesium-based alloy that contains 0.2 mass % to 5 mass % of calcium, wherein the magnesium-based alloy powder has an average particle diameter of 100 m to 1,500 m, wherein the magnesium-based alloy powder has a particle average aspect ratio of 0.5 to 1, wherein the magnesium-based alloy powder has an apparent density of 0.2 g/cm.sup.3 to 1.2 g/cm.sup.3, and wherein the mean value of hardness variation index values obtained by dividing the difference of the maximum value and the minimum value of micro Vickers hardnesses taken at 10 measurement points in a particle cross section by the maximum value is 0.3 or less.

The invention discloses metal powder for a 3D printer. The metal powder for 3D printers is 10-50-micron metal powder made by agglomerating many submicron order metal particles through a granulating process. As the metal powder is combined by submicron order metal particles, the metal powder is low in melting point and high in melting speed, so that the printing speed of the metal 3D printer can be increased and the precision of a printing member can be improved. Meanwhile, the average grain size of the metal powder is equivalent to existing atomized metal powder for 3D printers, and the metal powder has good dispersibility and conveying property, and can be suitable for existing 3D printer equipment.