A method for producing a metal powder includes maintaining molten reducing metal in a sealed reaction vessel that is free of added oxygen and water, establishing a vortex in the molten reducing metal, introducing a metal halide into the vortex so that the molten reducing metal is in a stoichiometric excess to the metal halide, thereby producing metal particles and salt, removing unreacted reducing metal, removing the salt, and recovering the metal powder. The molten reducing metal can be a Group I metal, a Group II metal, or aluminum.

Provided is a method for producing a calcium carbonate sintered compact by which sintering can be done at a lower temperature and a higher-density calcium carbonate sintered compact can be produced. A method for producing a calcium carbonate sintered compact includes the steps of: preparing calcium carbonate and a sintering aid that is a mixture of potassium fluoride, lithium fluoride, and sodium fluoride and has a melting point of 600 C. or less; compression molding a mixture of the calcium carbonate and the sintering aid mixed to contain the sintering aid in an amount of 0.1 to 3.0% by mass, thus making a green compact; and sintering the green compact to produce a calcium carbonate sintered compact.

The present invention relates to a nanoparticle composition having antibacterial and exothermic properties and a manufacturing method thereof, more particularly, a nanoparticle composition with very good antibacterial and exothermic properties obtained by preparing an ionized calcium powder from shells obtained through foreign matter removing, cleaning, drying, sintering, cooling and pulverizing processes, and passing it through a tourmaline mixing stage, a surfactant treatment stage, a synthetic resin mixing stage and a nanoparticle molding stage, and a manufacturing method thereof.

A method for producing a metal powder includes maintaining molten reducing metal in a sealed reaction vessel that is free of added oxygen and water, establishing a vortex in the molten reducing metal, introducing a metal halide into the vortex so that the molten reducing metal is in a stoichiometric excess to the metal halide, thereby producing metal particles and salt, removing unreacted reducing metal, removing the salt, and recovering the metal powder. The molten reducing metal can be a Group I metal, a Group II metal, or aluminum.

Provided is a nickel-based composite coating, method for producing the same and use thereof. A powder mixture is coated on the surface of a substrate to obtain a nickel-based composite coating, wherein the powder mixture comprises nickel-chromium-boron-silicon powders and barium titanate powders. The barium titanate powders are added to the nickel-based powders as a second phase to form BaTiO.sub.3NiCrBSi metal-based ceramic composite coating. The nickel-based barium titanate composite coating has an excellent damping shock absorbing performance and gives the substrate strength as well. Comparing with the conventional coating materials, the coating obtained by the present disclosure through plasma cladding technique not only bonds with the substrate in a metallurgic way, but also has a small heat affected zone, specifically, an excellent damping shock absorbing performance. In embodiments of the present disclosure, vibration and noise generated by the cylinder head is reduced 20% by using the shock absorbing cladding coating.

A method for producing a metal powder includes maintaining molten reducing metal in a sealed reaction vessel that is substantially free of oxygen and water, establishing a vortex in the molten reducing metal, introducing a metal halide into the vortex so that the molten reducing metal is in a stoichiometric excess to the metal halide, thereby producing metal particles and salt, removing unreacted reducing metal, removing the salt, and recovering the metal powder. The molten reducing metal can be a Group I metal, a Group II metal, or aluminum.

The present invention relates to a mould powder for coating cast moulds for reducing surface defects, such as pinholes, in ductile cast iron products. The mould powder comprises 10-99.5% by weight of a ferrosilicon alloy, 0.5-50% by weight of iron sulphide, and optionally 1-30% by weight of CaSi, and/or 1-10% by weight of CaF.sub.2. The invention further relates to a mould coating on and internal surface of a casting mould comprising 10-99.5% by weight of a ferrosilicon alloy, 0.5-50% by weight of iron sulphide, and optionally 1-30% by weight of CaSi, and/or 1-10% by weight of CaF.sub.2.

A preparation device for an alloy target includes a material nozzle, a high-energy laser, and a target support substrate, the material nozzle and the high-energy laser are respectively arranged above the target support substrate. The preparation device uses the material nozzle to spray the material powder required for the alloy target to be prepared, the injection efficiency is independently adjusted to achieve the purpose of non-fixed composition of the alloy target, and the spatial position and angle of the material nozzle are independently adjusted to ensure uniform composition and density of the target, the high-energy laser beam generated by the high-energy laser is used to heat the material powder in the spraying area to form a target coating of the required composition, the target support substrate is used to support the target coating formed by the material powder.

Disclosed are an anisotropic nanocrystalline rare earth permanent magnet and a preparation method thereof. The rare earth permanent magnet includes an REFeB matrix phase and a second phase, wherein the REFeB matrix phase includes main phase RE.sub.2Fe.sub.14B flaky nanocrystallines regularly arranged and an RE-rich phase around main phase grains, the main phase RE.sub.2Fe.sub.14B flaky nanocrystallines having an average grain size in a length direction of 70 nm to 800 nm and an average grain size in a thickness direction of 30 nm to 200 nm; and the second phase includes at least one selected from the group consisting of an M-Cu phase and an MCuO phase, M being at least one selected from the group consisting of Ca and Mg.

A preparation device for an alloy target includes a material nozzle, a high-energy laser, and a target support substrate, the material nozzle and the high-energy laser are respectively arranged above the target support substrate. The preparation device uses the material nozzle to spray the material powder required for the alloy target to be prepared, the injection efficiency is independently adjusted to achieve the purpose of non-fixed composition of the alloy target, and the spatial position and angle of the material nozzle are independently adjusted to ensure uniform composition and density of the target, the high-energy laser beam generated by the high-energy laser is used to heat the material powder in the spraying area to form a target coating of the required composition, the target support substrate is used to support the target coating formed by the material powder.