A hydrogen storage alloy suitable for prescribed pretreatment, that is, pretreatment wherein mechanical pulverization is performed after pulverizing a hydrogen storage alloy and absorbing/desorbing hydrogen is provided. The hydrogen storage alloy comprises a parent phase having a CaCu.sub.5-type, that is, an AB.sub.5-type crystal structure, wherein the A site is constituted from a rare earth element containing La; and the B site does not contain Co and contains at least Ni, Al, and Mn, with the ratio (Mn/Al) of the content of Mn (molar ratio) to the content of Al (molar ratio) being 0.60 or more and less than 1.56, and the ratio (La/(Mn+Al)) of the content of La (molar ratio) to the total content of the content of Al (molar ratio) and the content of Mn (molar ratio) being more than 0.92.

A synthesis process is disclosed for fabrication of mass quantities of high-purity α-MnBi magnetic powder and subsequent bulk permanent magnet. An illustrative process includes certain steps that include: multiple annealing, multiple comminuting such as multiple ball milling, forming a non-magnetic phase on and/or in the powder particles at particle grain boundaries before particle consolidation such as pressing, and magnetic annealing of a pressed compact. A reproducible and high productive synthesis process is created by combining these steps with other steps, which makes possible production of mass quantities of MnBi powder and bulk magnets with high performance.

A synthesis process is disclosed for fabrication of mass quantities of high-purity α-MnBi magnetic powder and subsequent bulk permanent magnet. An illustrative process includes certain steps that include: multiple annealing, multiple comminuting such as multiple ball milling, forming a non-magnetic phase on and/or in the powder particles at particle grain boundaries before particle consolidation such as pressing, and magnetic annealing of a pressed compact. A reproducible and high productive synthesis process is created by combining these steps with other steps, which makes possible production of mass quantities of MnBi powder and bulk magnets with high performance.

Provided is a new magnetic material with high magnetic stability, as well as a manufacturing method therefor, said magnetic material having a higher saturation magnetization than ferrite-based magnetic materials, and having a higher electrical resistivity than existing metal-based magnetic materials, thus solving problems such as that of eddy current loss. Mn-ferrite nanoparticles obtained through wet synthesis are reduced within hydrogen, and grains are allowed to grow while simultaneously using a phase separation phenomenon due to a disproportionation reaction to produce a magnetic material powder in which an α-(Fe, Mn) phase and a Mn-enriched phase are nano-dispersed. This powder is then sintered to produce a solid magnetic material.

Provided is a new magnetic material with high magnetic stability, as well as a manufacturing method therefor, said magnetic material having a higher saturation magnetization than ferrite-based magnetic materials, and having a higher electrical resistivity than existing metal-based magnetic materials, thus solving problems such as that of eddy current loss. Mn-ferrite nanoparticles obtained through wet synthesis are reduced within hydrogen, and grains are allowed to grow while simultaneously using a phase separation phenomenon due to a disproportionation reaction to produce a magnetic material powder in which an α-(Fe, Mn) phase and a Mn-enriched phase are nano-dispersed. This powder is then sintered to produce a solid magnetic material.

A method of increasing volume ratio of magnetic particles in a MnBi alloy includes depositing a MnBi alloy powder containing magnetic particles and non-magnetic particles on a sloped surface having a magnetic field acted thereupon. The method further includes collecting falling non-magnetic particles while separated magnetic particles are magnetically retained on the sloped surface.

A method of increasing volume ratio of magnetic particles in a MnBi alloy includes depositing a MnBi alloy powder containing magnetic particles and non-magnetic particles on a sloped surface having a magnetic field acted thereupon. The method further includes collecting falling non-magnetic particles while separated magnetic particles are magnetically retained on the sloped surface.

The present invention belongs to the technical field of metal materials for additive manufacturing, and relates to a Mn—Cu-based damping alloy powder for use in a selective laser melting (SLM) process and a preparation method thereof. The powder has chemical components in percent by weight as follows: C: ≤0.15%, Ni: 4.9-5.2%, Si: ≤0.15%, Fe: 1.8-5.0%, Cu: 20-23%, P: ≤0.03%, S: ≤0.06%, and the balance being Mn and inevitable impurities. The preparation method includes: preparation of master alloy, powdering by vacuum induction melting gas atomization (VIGA), mechanical vibrating and air classification screening under protection of an inert gas and collecting. Compared with the prior art, the powder of the present invention has a high sphericity, a high apparent density, a small angle of repose, a desired fluidity and a relatively high yield of fine powders having a size of 15-53 μm.

The present invention relates to a silicon based alloy comprising between 45 and 95% by weight of Si; max 0.05% by weight of C; 0.4-30% by weight Cr; 0.01-10% by weight of Al; 0.01-0.3% by weight of Ca; max 0.10% by weight of Ti; up to 25% by weight of Mn; 0.005-0.07% by weight of P; 0.001-0.02% by weight of S; the balance being Fe and incidental impurities in the ordinary amount, a method for the production of said alloy and the use thereof.

An alloy represented by the formula (Mn.sub.xAl.sub.y)C.sub.z, the alloy being aluminum (Al), manganese (Mn), and carbon (C), and optionally unavoidable impurities; wherein x=56.0 to 59.0 y=41.0 to 44.0 x+y=100, and z=1.5 to 2.4. The alloy is highly suitable for forming the and phase in high purity and high microstructural homogeneity. A method for processing an alloy of formula (Mn.sub.xAl.sub.y)C.sub.z, wherein x=52.0 to 59.0, y=41.0 to 48.0, x+y=100, and z=0.1 to 3.0, the process including providing the raw materials of the alloy, melting the raw materials, and forming particles of the alloy by gas atomization of the molten alloy.