METHOD FOR PRODUCTION OF NdFeBCu MAGNET AND NdFeBCu MAGNET MATERIAL
a technology of ndfebcu magnets and ndfebcu magnets, which is applied in the manufacture of magnetic materials, inductance/transformers/magnets, magnetic bodies, etc., can solve the problem that the temperature characteristics of ndfeb-type liquid-quenched ribbons that contain fine textures are not sufficien
Inactive Publication Date: 2011-12-29
TOYOTA JIDOSHA KK
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Benefits of technology
The present invention provides an NdFeB-type magnetic material that has a coercivity comparable or superior to rare metals without adding a large amount of rare metal. The invention relates to an NdFeBCu magnetic material that includes a quenched ribbon composed of an Nd—Fe—B—Cu alloy. The Nd—Fe—B—Cu alloy may have a composition represented by the general formula NdFeBCuA, where A may be a number that represents an atomic percent and may be between 1 and 3 inclusive. The Nd—Fe—B—Cu alloy may have a composition represented by the general formula Nd15Fe77B7Cu1. The method for producing the NdFeBCu magnet includes supplying an alloy melt onto a cooled roll to obtain a quenched ribbon as a ribbon shaped magnetic material. The quenched ribbon may then be pulverized and subjected to pressure sintering to obtain a bulk body. The resulting magnetic material has a coercivity that is comparable or superior to rare metals without adding a large amount of rare metal.
Problems solved by technology
However, the NdFeB-type liquid-quenched ribbon that contains fine textures does not have sufficient temperature characteristics as a magnetic material, and various proposals have been therefore made to improve the coercivity-temperature characteristics thereof.
Method used
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[0025]The present inventors conducted earnest studies to accomplish the above object and have reached the conclusion that an NdFeB-type magnet composed of multi-domain particles does not develop a coercivity without a magnetic field phase that prevents displacement and generation of domain walls and the coercivity-temperature characteristics thereof cannot be improved with the three elements alone. Then, as a result of additional studies, the present inventors have accomplished the present invention.
[0026]Description is hereinafter made of an embodiment of the present invention with reference to the drawings. Referring now to FIG. 1 and FIG. 2, the quenched NdFeBCui according to the embodiment of the present invention is generally comparable or superior in coercivity-temperature characteristics to a quenched NdFeBCo10 ribbon. It is believed that the high-temperature coercivity of the quenched NdFeBCu1 ribbon indicates the fact that a magnetic material that has excellent coercivity-t...
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Abstract
A method for producing an NdFeBCu magnet includes supplying an alloy melt having a composition that is represented by the general formula NdyFe100-x-y-zBzCuX, where x is between 1 and 3 inclusive, y is larger than 12 and at most 24, and z is larger than 6 and at most 12, onto a cooled roll to obtain a quenched ribbon as a ribbon shaped magnetic material.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for producing an NdFeBCu magnet and an NdFeBCu magnet material, and, more particularly, to a method for producing an NdFeBCu magnet that has a coercivity that is comparable or superior to that of an magnetic material that contains a rare metal such as Dy, Tb, Co or Cr without the addition of a large amount of the rare metal and an NdFeB-type magnet material for the NdFeBCu magnet.[0003]2. Description of the Related Art[0004]Magnetic materials are broadly classified into two groups: hard magnetic materials and soft magnetic materials. Hard magnetic materials are required to have a high coercivity, whereas soft magnetic materials are required to have a high maximum magnetization even if their coercivities are lower. The coercivity typical of hard magnetic materials is a characteristic relating to the stability of magnet, and as the coercivity is higher, the magnet can be used at a...
Claims
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IPC IPC(8): B22F3/12B22F1/00
CPCB22F2998/10B22F2999/00H01F41/0266H01F1/0577H01F1/0571C22C2202/02C22C38/16C22C38/005C22C1/0441C22C38/002B22F3/14B22F2201/20B22D1/00B22F9/04
Inventor KISHIMOTO, HIDEFUMISHOJI, TETSUYASAKUMA, NORITSUGU
Owner TOYOTA JIDOSHA KK