8 results about "Rare-earth magnet" patented technology

The present invention relates to a rare earth magnet and a method for manufacturing the same. Provided is a Sm-Fe-N-based rare earth magnet which is less likely to demagnetize than ever before under an environment where an external magnetic field is applied, particularly at high temperatures, and a method for manufacturing the same. The method for manufacturing the rare earth magnet of the present disclosure includes: preparing a SmFeN magnetic powder; preparing a modifying material powder containing a zinc component; mixing the SmFeN magnetic powder and the modifying material powder to obtain a mixed powder; compression molding the mixed powder in a magnetic field to obtain a magnetic field molded body; pressure sintering the magnetic field molded body to obtain a sintered body; and subjecting the sintered body to heat treatment. The D 50 of the magnetic powder is 1.50 μm or more and 3.00 μm or less, the content ratio of the zinc component in the modifying material powder is 6 mass% or more and 30 mass% or less, and the heat treatment temperature is 350°C or more and 410°C or less.

To provide an R-T-B-based rare earth magnet with an excellent magnetic property.SOLUTION: The present invention relates to an R-T-B-based rare earth magnet in which R is a rare earth element, T is Fe and / or Co, and B is boron, the carbon arrangement in the R-T-B-based rare earth magnet being adjusted.SELECTED DRAWING: Figure 1

A sintered rare-earth magnet comprises: a main phase satisfying a general formula (Nd, Pr, RH, R)-Fe-BM, where RH is a heavy rare-earth element including Dy and / or Tb, R is one or more rare-earth elements selected excluding Nd, Pr, Dy, and Tb, and M is one or more elements selected from a group consisting of Ga, Al, Cu, and Co, wherein the main phase contains crystal grains based on an Nd₂Fe₁₄B crystal structure; and a subphase. The main phase comprises a core section and a shell section and includes a first main phase satisfying CNd > CPr and a second main phase satisfying CNd <CPr erfüllt, wobei CNd die Konzentration von Nd im Kernabschnitt und CPr die Konzentration von Pr im Kernabschnitt ist. Die Konzentration des schweren Seltenerdelements RH ist im Kernabschnitt der ersten Hauptphase höher als im Kernabschnitt der zweiten Hauptphase.The first and second main phases are supplied mixed. The subphase comprises a first and a second subphase, consisting mainly of an oxide phase represented by (Nd, Pr, RH, La, Sm)-O, with the element M present as a minor component. The concentration of element M is higher in the second subphase than in the first subphase.

To provide a method for manufacturing an SmFeN-based rare earth magnet having high magnetic characteristics.SOLUTION: A method for manufacturing an SmFeN-based rare earth magnet includes the steps of: dispersing SmFeN-based anisotropic magnetic powder containing Sm, Fe, La, W, R (R is at least one selected from the group consisting of Ti, Ba and Sr) and N using a medium of metal or ceramic coated with a resin, and obtaining the dispersed SmFeN-based anisotropic magnetic powder; mixing the dispersed SmFeN-based anisotropic magnetic powder and modified material powder, and obtaining mixed powder; compression molding the mixed powder in a magnetic filed, and obtaining a magnetic field molding; pressure sintering the magnetic molding, and obtaining a sintered body; and heat treating the sintered body.SELECTED DRAWING: Figure 1

This disclosure provides a rare-earth magnet with improved magnetization compared to previous methods, and a method for manufacturing the same. The disclosure relates to a method for manufacturing a magnetic magnet and a rare-earth magnet obtained by this method. The method includes: preparing a mixture containing a specified magnetic powder and a modifying material powder; mixing the magnetic powder and the modifying material powder to obtain a mixed powder; compressing the mixed powder in a magnetic field to obtain a magnetically shaped body; and sintering the magnetically shaped body under pressure to obtain a sintered body. The magnetic powder comprises a first particle group and a second particle group, where d1μm represents the particle size distribution D of the first particle group. 50 And let d2μm represent the particle size distribution D of the second particle swarm. 50 The d1 and d2 satisfy the relationship 0.350≤d2 / d1≤0.500, and the ratio of the total volume of the first particle group to the total volume of the second particle group is in the range of 9:1 to 4:1.

A sintered rare-earth magnet (1) comprises: a main phase (10) satisfying a general formula (Nd, Pr, R)-Fe-BM, where R is one or more rare-earth elements selected excluding Nd and Pr, and M is one or more elements selected from a group consisting of Ga, Al, Cu, and Co, wherein the main phase contains crystal grains based on an Nd₂Fe₁₄B crystal structure; and a subphase (20) formed between the main phase and the main phase. The main phase comprises a core section and a shell section covering the core section. The main phase includes a first main phase (11) satisfying CNd > CPr, and a second main phase (12) satisfying CNd <CPr erfüllt, wobei CNd die Konzentration von Nd im Kernabschnitt und CPr die Konzentration von Pr im Kernabschnitt ist. Die erste Hauptphase und die zweite Hauptphase werden gemischt bereitgestellt.The subphase comprises a first subphase (21) and a second subphase (22), which are crystalline and consist mainly of an oxide phase represented by (Nd, Pr, R)-O, with the element M present as a minor component. The concentration of element M is higher in the second subphase than in the first subphase.

Provided is a rare earth magnet that allows suppressing deterioration of magnetic properties and a method for manufacturing the same. The rare earth magnet of the present disclosure includes a magnet body containing a rare earth element R1, a transition metal element T, and boron B and includes a main phase. A region in the vicinity of a corner portion of the magnet body of a constituent surface constituting a surface of the magnet body is a processed surface on which a removal process has been performed, and a region closer to a center than the region in the vicinity of the corner portion of the constituent surface is a non-processed surface on which the removal process is not performed.