METHOD FOR PRODUCTION OF NdFeBCu MAGNET AND NdFeBCu MAGNET MATERIAL

Abstract

A method for producing an NdFeBCu magnet includes supplying an alloy melt having a composition that is represented by the general formula Nd y Fe 100-x-y-z B z Cu X , 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.

1 - 12 . (canceled) 
     
     
         13 . A method for producing an NdFeBCu magnet comprising:
 supplying an alloy melt having a composition that is represented by the general formula Nd y Fe 100-x-y-z B z Cu X , wherein 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;   quenching the alloy melt on a surface of the roll to convert the alloy melt into fine textures;   peeling the alloy melt that has been quenched off the roll to obtain a quenched ribbon as a ribbon-shaped magnetic material;   removing columnar crystalline textures from the quenched ribbon;   pulverizing the quenched ribbon from which the columnar crystalline textures have been removed; and   subjecting the quenched ribbon, which has been pulverized, to pressure sintering to obtain a bulk body,   wherein subjecting the quenched ribbon to pressure sintering is carried out by subjecting the quenched ribbon to electric current heating.   
     
     
         14 . The method according to  claim 13 ,
 wherein subjecting the quenched ribbon to pressure sintering includes subjecting the quenched ribbon to electric current heating for 5 to 100 minutes under conditions of a contact pressure during sintering of 10 to 1000 MPa, a temperature that is 550° C. or higher and 600° C. or lower, and a vacuum of 10 −2  MPa or less.   
     
     
         15 . The method according to  claim 13 ,
 wherein y is 14 or larger, and   z is 7 or larger.   
     
     
         16 . The method according to  claim 13 ,
 wherein the alloy melt is composed of Nd y Fe 100-x-y-z B z Cu X  that has been molten at a temperature of 1400 to 1700° C., and   supplying an alloy melt onto a roll includes spraying the alloy melt onto the roll, which has a peripheral speed of 1.0 to 3.2 m/sec, under reduced pressure or in an inert gas atmosphere under conditions of a clearance of 0.6 to 1.2 mm and a spray pressure of 0.2 to 2 kg/cm 3 .   
     
     
         17 . The NdFeBCu magnetic material manufactured by using the method according to  claim 13 , the NdFeBCu magnetic material comprising a quenched ribbon composed of an Nd—Fe—B—Cu alloy. 
     
     
         18 . The NdFeBCu magnetic material according to  claim 17 ,
 wherein the Nd—Fe—B—Cu alloy has a composition that is represented by the general formula NdFeBCu A , and   A is a number that represents an atomic percent and is between 1 and 3 inclusive.   
     
     
         19 . The NdFeBCu magnetic material according to  claim 17 ,
 wherein the Nd—Fe—B—Cu alloy has a composition that is represented by the general formula Nd y Fe 100-x-y-z B z Cu X ,   x, y, and z are numbers that represent atomic percents,   x is between 1 and 3 inclusive,   y is a number that is larger than 12, and   z is a number that is larger than 6.   
     
     
         20 . The NdFeBCu magnetic material according to  claim 19 ,
 wherein y is 24 or smaller, and   z is 12 or smaller.   
     
     
         21 . The NdFeBCu magnetic material according to  claim 19 ,
 wherein y is 14 or larger, and   z is 7 or larger.   
     
     
         22 . The NdFeBCu magnetic material according to  claim 19 ,
 wherein the Nd—Fe—B—Cu alloy has a composition that is represented by the general formula Nd 15 Fe 77 B 7 Cu 1 .   
     
     
         23 . The NdFeBCu magnetic material according to  claim 17 ,
 wherein the Nd—Fe—B—Cu alloy has a composition of a quaternary alloy composed of Nd, Fe, B and Cu.