| 摘要 |
PURPOSE:To improve the rust resistance and to obtain an excellent magnetic characteristic by adding a specified amount of chrome compound to a plastic magnet composition consisting of Fe-Nd-B or Fe-Nd-Pr-B alloy and binder. CONSTITUTION:A plastic magnetic composition consisting of alloy of Fe-Nd-B or Fe-Nd-Pr-B and binder is added with chrome compound of 0.01-10 pts. wt. to 100 pts. wt. of the alloy. Said Fe-Nd-B or Fe-Nd-Pr-B alloy also contains Si or Si + Al, wherein the contained ratio is regulated in the range as follows: the sum of Nd or Nd + Pr 10-15 at %, Bis 4-10 at %, Si is 0.4-3 at %, Al is 0.1-3 at %, Si + Al is 0.5-3.5 at %, Fe as a remainder. Fe of not more than 20 at % may be substituted with Co. Thereby, the Fe-Nd-B plastic magnet is improved in its magnetic characteristics, while displaying an excellent rust resistant property. |
