A resonant energy stabilizer contains: a body, a lid, a mineral crystal, the current amplifier, and a medium frequency current device. The body includes an accommodation chamber. The lid includes an accommodating room. The mineral crystal includes a recess configured to accommodate a sapphire for producing far-infrared waves of electrostatic pulse. The recess is surrounded by a white crystal, a citrine and a green crystal which are surrounded by multiple titanium crystals, and a first magnetite is located above the white crystal, the citrine and the green crystal. The current amplifier includes multiple plasma pieces stacked together to increase a distance of the far-infrared waves of the electrostatic pulse, and each plasma piece has a copper coil layer, a red brass patch, and a red copper sheet. The medium frequency current device includes multiple second magnetites, an input segment, a central processing unit, a booster, and an output segment.

The present invention discloses a grain boundary diffusion method of an R—Fe—B series rare earth sintered magnet, an HRE diffusion source, and a preparation method thereof, comprising the following steps: engineering A of forming a dry layer on a high-temperature-resistant carrier, the dry layer being adhered with HRE compound powder, the HRE being at least one of Dy, Tb, Gd, or Ho; and engineering B of performing heat treatment on the R—Fe—B series rare earth sintered magnet and the high-temperature-resistant carrier treated with the engineering A in a vacuum or inert atmosphere and supplying HRE to a surface of the R—Fe—B series rare earth sintered magnet. The method can reduce the consumption of heavy rare earth element and control the loss of residual magnetism Br while increasing the coercivity.

A neodymium-iron-boron magnetic material, a preparation method therefor and an application thereof. The neodymium-iron-boron magnetic material comprises the following components in percentage by mass: 29.5-31.5 wt. % of R, where RH>1.5 wt. %; 0.05-0.25 wt. % of Cu; 0.42-2.6 wt. % of Co; 0.20-0.3 wt. % of Ga; 0.25-0.3 wt. % of N; 0.46-0.6 wt. % of Al, or alternatively Al is less than or equal to 0.04 wt. % but is not 0; 0.98-1 wt. % of B; and 64-68 wt. % of Fe; wherein R is a rare-earth element and comprises Nd and RH, RH is a heavy rare-earth element and comprises Tb, and a mass ratio of Tb to Co is less than or equal to 15 but is not 0. The neodymium-iron-boron magnetic material has higher Hcj and Br, and lower absolute values of temperature coefficients of Br and Hcj.

The present invention discloses rare earth-bonded magnetic powder and a preparation method therefor. The bonded magnetic powder is of a multilayer core-shell structure, and comprises a core layer and an antioxidant layer (3), wherein the core layer is formed by RFeMB, R is Nd and/or PrNd, and M is one or more of Co, Nb, and Zr; and the core layer is coated with an iron-nitrogen layer (2). In addition, the present invention also discloses the preparation method for the rare earth-bonded magnetic powder and a bonded magnet. The oxidation and corrosion of magnetic raw powder during phosphorization and subsequent treatment process are effectively prevented, thereby further improving the long-term temperature resistance and environmental tolerance of the material.

The present invention discloses rare earth-bonded magnetic powder and a preparation method therefor. The bonded magnetic powder is of a multilayer core-shell structure, and comprises a core layer and an antioxidant layer (3), wherein the core layer is formed by RFeMB, R is Nd and/or PrNd, and M is one or more of Co, Nb, and Zr; and the core layer is coated with an iron-nitrogen layer (2). In addition, the present invention also discloses the preparation method for the rare earth-bonded magnetic powder and a bonded magnet. The oxidation and corrosion of magnetic raw powder during phosphorization and subsequent treatment process are effectively prevented, thereby further improving the long-term temperature resistance and environmental tolerance of the material.

An R-T-B based permanent magnet, in which R is a rare earth element, T is Fe or a combination of Fe and Co, and B is boron, includes main phase grains made of an R.sub.2T.sub.14B crystal phase and grain boundaries formed between the main phase grains. The grain boundaries include an R—O—C—N concentrated part having higher concentrations of R, O, C, and N than that of the main phase grains. The R—O—C—N concentrated part includes a heavy rare earth element. The R—O—C—N concentrated part has a core part and a shell part covering at least part of the core part. A concentration of the heavy rare earth element in the shell part is higher than a concentration of the heavy element in the core part. A covering ratio of the shell part with respect to the core part of the R—O—C—N concentrated part is 45% or more in average.

A method of preparing magnetic powder includes preparing iron powder by a reduction reaction of iron oxide; preparing magnetic powder by heat-treating a molded article prepared by pressure-molding a mixture containing the iron powder, neodymium oxide, boron and calcium at a pressure of 22 MPa or more; and coating an organic fluoride on a surface of the magnetic powder.

A dual-rotor machine comprising a dual rotor support structure rotatably connected to a frame. A stationary stator is disposed between the rotors and is fixed to the frame. An inner rotor and outer rotor, each comprising a permanent magnet Halbach array, are coaxially disposed with the stator and are rotable about the stator. In this configuration, the inner rotor channels its magnetic flux to its outside, while the outer rotor channels its magnetic flux to its inside. The magnetic flux density at the stator for the dual-rotor machine can be as high as 2 Tesla or higher for high-grade neodymium-iron-boron permanent magnet material, and the stored magnetic energy for conversion to mechanical or electrical energy available to the stator may be at least 0.5 kJ/m. The rotor Halbach arrays may comprise monolithic permanent magnets with continuously variable magnetic field direction.

The current invention discloses a type of micronized powder for manufacturing sintered Neodymium magnetic material, a target type jet mill pulverization method to prepare the micronized powder, and the resulting pulverized powder. The Neodymium magnet powder created under the method is of sphericity of greater than or equal to 90% and of particle adhesion rate of less than or equal to 10%. A is the diameter of the target center, B is the diameter of the side nozzle, and C is the distance between the target center and the nozzle. The relationship amongst A, B and C is A/B=m×(C/A+B), where m ranges from 1 to 7. A velocity of the jet stream from side nozzle is between about 320 m/s to about 580 m/s.

The disclosure relates to the technical field of sintered type NdFeB permanent magnets, in particular to a low-cost rare earth magnet and manufacturing method. There is provided a method of preparing a high-coercivity, sintered NdFeB magnet including cerium comprising the following steps:

(S1) Providing alloy flakes composed of R.sub.xT.sub.(1-x-y-z)B.sub.yM.sub.z;

(S2) Mixing the alloy flakes, a low melting point powder, and a lubricant, then subjecting the mixture to a hydrogen embrittlement process followed in this order by pulverizing the process product to an alloy powder by jet milling, magnetic field orientation molding of the alloy powder to obtain a blank, sintering and aging treatment the blank;

(S3) Coating a film composed of a diffusion source of formula R1.sub.xR2.sub.yH.sub.zM.sub.1-x-y-z on the sintered NdFeB magnet; and

(S4) Performing a diffusion heat treatment, followed by aging the sintered NdFeB magnet to obtain the low-cost rare earth magnet.