Rare earth permanent magnet alloy and producing method thereof

Abstract

A rare earth permanent magnet alloy with a high coercive force is disclosed. The rare earth permanent magnet alloy comprises: a rare earth-iron-boron type magnetic phase (R 2 Fe 14 B type magnetic phase) constituting a parent phase; and a defect structure. The parent phase contains the defect structure. Displacement of magnetic domain wall of the R 2 Fe 14 B type magnetic phase is prevented by the defect structure, thereby improving coercive force.

1 . A rare earth permanent magnet alloy comprising:
 a rare earth-iron-boron type magnetic phase (R 2 Fe 14 B type magnetic phase) constituting a parent phase; and   a defect structure,   wherein the parent phase contains the defect structure, and the defect structure includes a part comprising the R 2 Fe 14 B type magnetic phase as a main component and that magnetic property is modulated from magnetic property of the parent phase.   
     
     
         2 . A rare earth permanent magnet alloy according to  claim 1 , wherein the part is formed by element concentration. 
     
     
         3 . A rare earth permanent magnet alloy according to  claim 1 , wherein the part is formed by lattice strain resulting from element concentration. 
     
     
         4 . A rare earth permanent magnet according to  claim 1 , wherein the defect structure includes impurity. 
     
     
         5 . A rare earth permanent magnet alloy according to  claim 4 , wherein the impurity induces lattice strain of the R 2 Fe 14 B phase comprising the defect structure. 
     
     
         6 . A rare earth permanent magnet alloy according to  claim 1 , wherein the defect structure includes precipitated phase originated from supersaturated solid solution. 
     
     
         7 . A rare earth permanent magnet alloy according to  claim 1 , wherein the R is a rare earth element including Yttrium (Y). 
     
     
         8 . A rare earth permanent magnet alloy according to  claim 1 , wherein the magnetic phase includes at least one or more kind of additive element in addition to R, Fe, and B. 
     
     
         9 . A producing method of a rare earth permanent magnet alloy comprising the steps of:
 generating a defect structure included in a rare earth-iron-boron type magnetic phase (R 2 Fe 14 B type magnetic phase) constituting a parent phase and comprising the R 2 Fe 14 B type magnetic phase as a main component,   wherein the defect structure is generated to include a part that magnetic property is modulated from magnetic property of the parent phase by performing one or more aging process.   
     
     
         10 . A producing method of a rare earth permanent magnet alloy according to  claim 9 , wherein at least one amorphization process and a crystallization process of the parent phase after the amorphization process are performed as the aging process. 
     
     
         11 . A producing method of a rare earth permanent magnet alloy according to  claim 9 , wherein the defect structure is generated by the crystallization process.