Abstract:
A method for producing a nanocrystalline rare earth magnet having a grain and a grain boundary phase includes: quenching a melt of a rare earth magnet composition to form a quenched thin ribbon having a nanocrystalline structure; sintering the quenched thin ribbon to obtain a sintered body; heat treating the sintered body at a temperature which is higher than a lowest temperature in a first temperature range where the grain boundary phase diffuses or flows, and which is lower than a lowest temperature in a second temperature range where the grain is inhibited from becoming coarse; and quenching the heat treated sintered body to 200°C or less at a cooling speed of 50°C/min or more.
Abstract:
A rare-earth nanocomposite magnet includes a nano-sized hard magnetic phase and a nano-sized soft magnetic phase, and the soft magnetic phase has a crystal grain diameter in the range of 1 nm to 100 nm.
Abstract:
A method of producing an R-T-B rare earth magnet that include forming an R-T-B (R: rare-earth element, T: Fe, or Fe and partially Co that substitutes for part of Fe) rare earth alloy powder into a compact and performing hot plastic working on the compact, characterized in that the hot plastic working is performed in a direction that is different from the direction in which the forming was performed.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von magnetischen Kompositen, umfassend das elektrophoretische Abscheiden hartmagnetischer Partikel und weichmagnetischer Partikel aus einer Suspension an eine Elektrode, sowie die mit dem Verfahren hergestellten Komposite und deren Verwendung zur Herstellung von Permanentmagneten.
Abstract:
A type of sintered Nd-Fe-B permanent magnet with high corrosion resistance is produced by dual alloy method. The method comprises the following steps: preparing the powders of master phase alloy and intergranular phase alloy respectively, mixing the powders, compacting the powders in magnetic field, sintering the compacted body at 1050~1125℃, and annealing at 920-1020℃ and 500-650℃ successively.
Abstract:
A type of sintered Nd-Fe-B permanent magnet with high intrinsic coercivity of about 30KOe or more is produced by dual alloy method. The method comprises the following steps: preparing the powders of master phase alloy and intergranular phase alloy respectively, mixing the powders, compacting the powders in magnetic field, sintering the compacted body at 1050~1125℃ and annealing at 890-1000℃ and 500-650℃ successively. In the process of preparing the powder of intergranular phase alloy, the nano-powder additive selected from the group consisting of NiAl, TiC, SiC, AlN, TiN, ZrN and the combination thereof is used to modify the powder of intergranular phase alloy.