Provided is an R-T-B-based magnet material alloy including an R.sub.2T.sub.14B phase which is a principal phase and R-rich phases which are phases enriched with the R, wherein the principal phase has primary dendrite arms and secondary dendrite arms diverging from the primary dendrite arms, and regions where the secondary dendrite arms have been formed constitute a volume fraction of 2 to 60% of the alloy, whereby excellent coercive force can be ensured in R-T-B-based sintered magnets even when the amount of heavy rare earth elements added to the alloy is reduced. The inter-R-rich phase spacing is preferably at most 3.0 m, and the volume fraction of chill crystals is preferably at most 1%. Furthermore, the secondary dendrite arm spacing is preferably 0.5 to 2.0 m, and the ellipsoid aspect ratio of R-rich phase is preferably at most 0.5.

A fluidized bed mixer for combining a first powder with a second powder for manufacturing a magnet and a method of using the fluidized bed mixer for making the magnet. The first powder material is an alloy powder containing neodymium (Nd), iron (Fe), and boron (B), and the second powder material is an alloy powder or elemental metal powder containing one or more of dysprosium (Dy) and terbium (Tb). The fluidized bed mixer includes a fluidized bed portion in an upper portion of a mixing chamber, a cascading baffle system beneath the fluidized bed portion, and combined powder collection area beneath the cascading baffle system. The fluidized bed mixer is configured to homogenously combine a first powder material with a second powder material in such a way that particles of the second powder material adheres to and covers the outer surfaces of the particles of the first powder material.

Embodiments relate to systems and methods for producing magnetic material. The method includes providing a mixture of alloys. The composition of alloy are not particularly limited. The method includes melting the mixture of alloys to arrive at a molten mixture of alloys. The method includes performing a melt-spinning process to rapidly solidify the molten mixture of alloys via a rotatable wheel to arrive at a preliminary metallic ribbon. The preliminary metallic ribbon having an elongated flat body with a bottom side and a top side, the top side opposite to the bottom side. The method includes performing a grain size refinement and uniformity process, the grain size refinement and uniformity process including delivering a first coolant directly to at least a central region of the top side and/or bottom side of the preliminary metallic ribbon to arrive at a final metallic ribbon.

The present disclosure provides neodymium-iron-boron magnetic body having gradient distribution, comprising an ease-to-demagnetize zone and a hard-to-demagnetize zone, wherein in a direction perpendicular to magnetization direction, remanence of the ease-to-demagnetize zone is less than remanence of the hard-to-demagnetize zone, and coercivity of the ease-to-demagnetize zone is greater than coercivity of the hard-to-demagnetize zone; and along the direction perpendicular to magnetization direction, the remanence and the coercivity of the ease-to-demagnetize zone are respectively a constant value, and the remanence and the coercivity of the hard-to-demagnetize zone are respectively a constant value. Due to the gradient distribution of remanence and coercivity of the neodymium-iron-boron magnetic body provided by the present application, the remanence, coercivity, magnetic flux and surface magnetic field of the neodymium-iron-boron magnetic body are optimized.

An electric motor is provided for use in an electromechanical transmission that utilizes automatic transmission fluid. The electric motor includes a stator and a rotor. The rotor includes a plurality of permanent magnets can include magnetic particles coated with hydrogen impermeable material. According to an alternative embodiment, the entire permanent magnet or the rotor itself can be coated with hydrogen impermeable material. According to a further alternative embodiment, the permanent magnet particles can be secured by a binder that includes a hydrogen storage compound that prevents hydrogen from affecting magnetic properties of the permanent magnet.

The present disclosure provides a gluing device, a gluing method and a colloid for packaging devices. The gluing device includes an instillation head configured to guide a glue added with magnetic material in an instillation direction; and a magnetic field generation mechanism configured to apply a magnetic field within the instillation head, so as to apply a force to the magnetic material through the magnetic field in a direction identical to or opposite to the instillation direction. Thus a flow rate of the glue in the instillation direction is controlled through the force applied by the magnetic material to the glue. The glue in the gluing device may be smoothly dripped out at a constant flow rate, thereby to prevent the occurrence of discontinuous or thin glue lines in the related art due to an insufficient pressure during gluing.

The present invention discloses a low-B rare earth magnet. The rare earth magnet contains a main phase of R.sub.2T.sub.14B and comprises the following raw material components: 13.5 at %4.5 at % of R, 5.2 at %5.8 at % of B, 0.3 at %0.8 at % of Cu, 0.3 at %3 at % of Co, and the balance being T and inevitable impurities, the R being at least one rare earth element comprising Nd, and the T being an element mainly comprising Fe. 0.30.8 at % of Cu and an appropriate amount of Co are co-added into the rare earth magnet, so that three Cu-rich phases formed in the grain boundary, and the magnetic effect of the three Cu-rich phases existing in the grain boundary and the solution of the problem of insufficient B in the grain boundary can obviously improve the squareness and heat-resistance of the magnet.

The present invention is provided with a quenched alloy for rare earth magnet and a manufacturing method of rare earth magnet. It comprises an R.sub.2T.sub.14B main phase, wherein R is selected from at least one rare earth element including Nd. The average grain diameter of the main phase in the brachyaxis direction is in a range of 1015 m and the average interval of the Nd rich phase is in a range of 1.03.5 m. In the fine powder of the above-mentioned quenched alloy, the number of magnet domains of a single grain decreases. Thus, it is easier for external magnetic field orientation to obtain high performance magnet, and the squareness, coercivity and the thermal resistance of the magnet are sufficiently improved.

The present invention discloses a method of manufacturing, powder making device for rare earth magnet alloy powder, and a rare earth magnet. The method comprises a process of fine grinding at least one kind of rare earth magnet alloy or at least one kind of rare earth magnet alloy coarse powder in inert jet stream with an oxygen content below 1000 ppm to obtain powder that has a grain size smaller than 50 m. Low oxygen content ultra-fine powder having a grain size smaller than 1 m is not separated from the pulverizer, and the oxygen content of the atmosphere is reduced to below 1000 ppm in the pulverizer when crushing the powder. Therefore, abnormal grain growth (AGG) rarely happens in the sintering process. A low oxygen content sintered magnet is obtained and the advantages of a simplified process and reduced manufacturing cost are realized.

A permanent magnet contains a rare-earth element R, a transition metal element T, and boron. The permanent magnet contains a plurality of main phase grains and a plurality of soft magnetic grains. The plurality of soft magnetic grains contain Fe. A cross-section of the permanent magnet includes a plurality of soft magnetic regions. The cross-section of the permanent magnet is parallel to an easy magnetization axis direction of the permanent magnet. Each of the plurality of soft magnetic regions contains the plurality of soft magnetic grains aligned along a direction orthogonal to the easy magnetization axis direction. The plurality of main phase grains and the plurality of soft magnetic regions are alternately disposed in the easy magnetization axis direction. An average value of width of the plurality of soft magnetic grains in the easy magnetization axis direction ranges from 20 nm to 5 ?m.