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Permanent magnet material and process for producing the same
| Details |
Inventors: Yoneyama, Tetsuhito; Hori, Tetsuo; Ojima, Teruhiko;
Assignee: TDK Electronics, Co., Ltd. (Tokyo, JP)
Primary Examiner: Rutledge; L. Dewayne
Assistant Examiner: Lewis; Michael L.
Attorney, Agent or Firm: Friederichs; Norman P.
Disclosed is the addition of Nb, V, Ta or Zr to the ternary alloy of R (rare earth)-Co-Cu for permanent magnet materials, to thereby provide the permanent magnets with increased coercive force, residual magnetization and energy product. The additional elements enables employment of such Cu and Fe contents of the alloy as less than 10% and more than 6%, respectively. These percentages were avoided in the prior art to prevent the reduction of Br and Hc, respectively. |
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DETAILED DESCRIPTION What is claimed is: 1.
A permanent magnet of R.
sub.
2 Co.
sub.
17 type crystal structure consisting essentially of at least one rare earth metal in an amount of from 24 to 28% by weight, copper in an amount of from 5 to 12% by weight, iron in an amount of from 8 to 15% by weight, a total combined amount of cobalt and iron being from 56 to 70.
8% by weight, and niobium in an amount of from 0.
2 to 4% by weight, all percentages being based on the total weight of magnet.
2.
A permanent magnet according to claim 1, wherein said amount of said iron is from 10 to 14% by weight.
3.
A permanent magnet according to claim 1, wherein said amount of said R is from 25 to 27% by weight, said combined amount of said cobalt and iron is from 61.
5 to 67.
5% by weight, said amount of said copper is from 7 to b 9% by weight and said amount of said niobium is from 0.
5 to 2.
5% by weight.
4.
A permanent magnet according to claim 1, wherein said magnet has an energy product in excess of 17 MG.
Oe.
5.
A permanent magnet according to claim 1, wherein said magnet has a coercive force in excess of 3 KOe.
6.
A permanent magnet according to claim 1, wherein said magnet has an energy product of at least 20 MG.
Oe.
7.
A permanent magnet according to claim 1, wherein said magnet has a coercive force of at least 5.
6 KOe.
8.
A permanent magnet according to claim 1, wherein said magnet has an energy product in excess of 24 MG.
Oe.
9.
A permanent magnet of R.
sub.
2 Co.
sub.
17 type crystal structure consisting essentially of at least one rare earth metal in an amount of from 24 to 28% by weight, copper in an amount of from 5 to 12% by weight, iron in an amount of from 8 to 14% by weight, a total combined amount of cobalt and iron being from 56 to 70.
8% by weight, and tantalum in an amount of from 0.
2 to 4% by weight, all percentages being based on the total weight of magnet.
10.
A permanent magnet according to claim 9, wherein said amount of said iron is from 10 to 13% by weight.
11.
A permanent magnet according to claim 9, wherein said amount of said R is from 25 to 27% by weight, said combined amount of said cobalt and iron is from 61
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Nonmetallic Processes 
