A method and a device for recovering hydrogen pulverized powder of a raw-material alloy for rare-earth magnets capable of lowering the possibility that hydrogen pulverized powder remains in a recovery chamber; therefore, enhancing magnetic properties by reducing an oxygen content of an obtained rare-earth magnet. A processing container 50 is carried into a recovery chamber 40 from a processing chamber after inert gas is introduced into the recovery chamber 40. The raw-material alloy for rare-earth magnets in the processing container 50 is discharged into the recovery chamber 40 after the pressure in the recovery chamber 40 is reduced Thereafter, inert gas is introduced into the recovery chamber 40, and the raw-material alloy for rare-earth magnets is recovered into the recovery container 50 after a pressure in the recovery chamber 40 is set to a predetermined pressure by inert gas.

A method and an equipment for processing NdFeB rare earth permanent magnetic alloy with a hydrogen pulverization are provided. The method includes steps of: providing a continuous hydrogen pulverization equipment; while driving by a transmission device, passing a charging box loaded with rare earth permanent magnetic alloy flakes orderly through a hydrogen absorption chamber, having a temperature of 50-350 C. for absorbing hydrogen, a heating and dehydrogenating chamber, having a temperature of 600-900 C. for dehydrogenating, and a cooling chamber of the continuous hydrogen pulverization equipment; receiving the charging box by a discharging chamber through a discharging valve; pouring out the alloy flakes after the hydrogen pulverization into a storage tank at a lower part of the discharging chamber; sealing up the storage tank under a protection of nitrogen; and, moving the charging box out through a discharging door of the discharging chamber and re-loading, for repeating the previous steps.

A continuous hydrogen pulverization method of a rare earth permanent magnetic alloy includes: providing a hydrogen adsorption room, a heating dehydrogenation room and a cooling room in series, applying hydrogen adsorption, heating dehydrogenation and cooling on a rare earth permanent magnetic alloy in the production device at the same time, wherein collecting and storing under an inert protection atmosphere can also be provided. Continuous production is provided under vacuum and the inert protection atmosphere in such a manner that an oxygen content of the pulverized powder is low and a proportion of single crystal in the powder is high.

A method for producing a magnet powder is provided in the present disclosure. The method includes synthesizing a RFeB-based magnet powder by a reduction-diffusion process, coating an antioxidant film onto a surface of the RFeB-based magnet powder, and immersing and cleaning the RFB-based magnet powder in an aqueous solvent or a non-aqueous solvent, wherein R is Nd, Pr, Dy or Tb, and wherein the antioxidant film includes a compound containing at least one amino group.

A high-Cu and high-Al neodymium iron boron magnet and a preparation method therefor. The high-Cu and high-Al neodymium iron boron magnet comprises: 29.5-33.5% R, over 0.985% B, over 0.50% Al, over 0.35% Cu, over 1% RH, and 0.1-0.4% high-melting-point elements N and Fe, wherein the percentages are the mass percentages of the elements in the total amount of elements, and the mass percentages of the element contents must satisfy the following relationships: (1) 1<RH<0.11R<3.54B; and (2) 0.12RH<Al. By means of combining Al, RH and high-melting-point metal elements that are added at a certain ratio, the problem in which the strength of a high-Cu magnet is insufficient is effectively solved, while the magnetic performance is the magnet material is ensured.

A high-strength R-T-B rare earth permanent magnet having an amorphous grain boundary phase includes: 29.0 wt. %-34.0 wt. % of large-atomic-radius elements with the atomic radius r satisfying r0.16 nm, said large-atomic-radius elements comprising 0.1 wt. %-0.8 wt. % of Mf, and Mf being any one or two of Zr and Mg; 1.05 wt. %-1.65 wt. % of small-atomic-radius elements with r0.12 nm, said small-atomic-radius elements comprising 0.8 wt. %-1.1 wt. % of boron element, and the total content C1 of the small-atomic-radius elements satisfying 0.25 wt. %[C1][B]0.55 wt. %; and the balance being medium-atomic-radius elements with 0.12 nm<r<0.16 nm and impurities, said medium-atomic-radius elements at least comprising 60.0 wt. % of TM, the TM being at least one of Fe and Co, and the content of other medium-atomic-radius elements except said TM being 0.2 wt. %. In the present invention, the proportion of the amorphous grain boundary phase in the grain boundary phase of the magnet is increased to 20 vol. % or more, thereby improving the capability of resisting crack propagation of the grain boundary phase of the magnet, and manufacturing a high-strength R-T-B rare earth permanent magnet.

A sintered neodymium iron boron magnet as shown in the formula RxT100-x-y1-y2-zMy1Ay2Bz is provided according to the present application, which specifically includes three different technical solutions.

An object of the present invention is to enhance a coercive force of magnetic particles by promoting formation of a continuous R-rich grain boundary phase in a crystal grain boundary of a magnetic phase of the particles, and to thereby obtain R-T-B-based rare earth magnet particles further having a high residual magnetic flux density. The present invention relates to production of R-T-B-based rare earth magnet particles capable of exhibiting a high coercive force even when a content of Al therein is reduced, and a high residual magnetic flux density, in which formation of an R-rich grain boundary phase therein can be promoted by heat-treating Al-containing R-T-B-based rare earth magnet particles obtained by HDDR treatment in vacuum or in an Ar atmosphere at a temperature of not lower than 670 C. and not higher than 820 C. for a period of not less than 30 min and not more than 300 min.

An R-T-B-based permanent magnet which contains R that represents at least one rare earth element essentially including Tb or Dy, T that represents Fe or at least one iron-group element essentially including Fe and Co, and B that represents boron, and further contains Cu. The total content of R is 28.35 to 29.95% by mass, inclusive, the content of Cu is 0.05 to 0.40% by mass, inclusive, and the content of B is 0.93 to 1.00% by mass, inclusive. The distribution of the concentration of Tb or Dy decreases from the outside of the R-T-B-based permanent magnet toward the inside of the R-T-B-based permanent magnet.