Qun Chen

US Patent:

6352599, Mar 5, 2002

Filed:

Jul 12, 1999

Appl. No.:

09/351760

Inventors:

Wen Cheng Chang - Chai-Yi, TW
Qun Chen - Princeton NJ
Charles O. Bounds - Barrington RI

Assignee:

Santoku Corporation - Kobe

International Classification:

H01F 1057

US Classification:

148302, 148101, 148121, 252 6254

Abstract:

Magnetic nanocomposite materials including iron, rare earth elements, boron, refractory metals and cobalt which have favorable magnetic properties and are suitable for making bonded magnets are disclosed. Compositions of the present invention can be of the formula: (N La ) Fe Co M B , where M is at least one refractory metal selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W; v is from about 5 to about 15; w is greater than or equal to 5; x is from about 9 to about 30; y is from about 0. 05 to about 0. 5; and z is from about 0. 1 to about 5. Preferably M is at least Cr. These materials have good magnetic properties and are suitable for use in preparing bonded magnets.

US Patent:

63329336, Dec 25, 2001

Filed:

Dec 31, 1997

Appl. No.:

9/001727

Inventors:

Charles O. Bounds - Yardley PA
Wen Cheng Chang - Chia-Yi, TW
Qun Chen - Princeton NJ

Assignee:

Santoku Corporation - Kobe

International Classification:

H01F 1057

US Classification:

148302

Abstract:

Magnetic nanocomposite materials including iron, rare earth elements, boron, refractory metal and, optionally, cobalt are disclosed. Neodymium and lanthanum are preferred rare earth elements. The amounts of Nd, La, B and refractory metal are controlled in order to produce both hard and soft magnetic phases, as well as a refractory metal boride precipitated phase. The refractory metal boride precipitates serve as grain refiners and substantially improve the magnetic properties of the nanocomposite materials. The materials are particularly suitable for making bonded magnets.