James W Herchenroeder

US Patent:

6979409, Dec 27, 2005

Filed:

Feb 6, 2003

Appl. No.:

10/359067

Inventors:

Zhongmin Chen - Apex NC, US
Benjamin R. Smith - Raleigh NC, US
James W. Herchenroeder - Gaston IN, US

Assignee:

Magnequench, Inc. - Singapore

International Classification:

H01F001/057

US Classification:

252 6254, 148302, 420 83, 420121

Abstract:

The present invention relates to highly quenchable Fe-based rare earth magnetic materials that are made by rapid solidification process and exhibit good magnetic properties and thermal stability. More specifically, the invention relates to isotropic Nd—Fe—B type magnetic materials made from a rapid solidification process with a lower optimal wheel speed and a broader optimal wheel speed window than those used in producing conventional magnetic materials. The materials exhibit remanence (B) and intrinsic coercivity (H) values of between 7. 0 to 8. 5 kG and 6. 5 to 9. 9 kOe, respectively, at room temperature. The invention also relates to process of making the materials and to bonded magnets made from the magnetic materials, which are suitable for direct replacement of anisotropic sintered ferrites in many applications.

US Patent:

7144463, Dec 5, 2006

Filed:

Sep 6, 2005

Appl. No.:

11/221296

Inventors:

Zhongmin Chen - Apex NC, US
Benjamin R. Smith - Raleigh NC, US
James W. Herchenroeder - Gaston IN, US

Assignee:

Magnequench, Inc. - Singapore

International Classification:

H01F 1/057

US Classification:

148101, 148105, 148121, 148302, 164462, 164463

Abstract:

The present invention relates to highly quenchable Fe-based rare earth magnetic materials that are made by rapid solidification process and exhibit good magnetic properties and thermal stability. More specifically, the invention relates to isotropic Nd—Fe—B type magnetic materials made from a rapid solidification process with a lower optimal wheel speed and a broader optimal wheel speed window than those used in producing conventional magnetic materials. The materials exhibit remanence (B) and intrinsic coercivity (H) values of between 7. 0 to 8. 5 kG and 6. 5 to 9. 9 kOe, respectively, at room temperature. The invention also relates to process of making the materials and to bonded magnets made from the magnetic materials, which are suitable for direct replacement of anisotropic sintered ferrites in many applications.

US Patent:

20120076684, Mar 29, 2012

Filed:

Mar 17, 2009

Appl. No.:

13/201824

Inventors:

Zhongmin Chen - Singapore, SG
James W. Herchenroeder - Harrodsburg KY, US

Assignee:

MAGNEQUENCH INTERNATIONAL INC. - PENDLETON IN

International Classification:

C22C 38/00

US Classification:

420 83

Abstract:

There is disclosed a magnetic material having a composition in atomic percentage of: (MMR)FeYMTBwherein MM is a mischmetal or a synthetic equivalent thereof; R is Nd, Pr or a combination thereof; Y is a transition metal other than Fe; M is one or more of a metal selected from Groups 4 to 6 of the periodic table; and T is one or more of a metal other than B, selected from Groups 11 to 14 of the periodic table, wherein 0≦a≦1, 7≦u≦13, 0≦v≦20, 0≦w≦5; 0≦x≦5 and 4≦y≦12.

US Patent:

50858289, Feb 4, 1992

Filed:

May 15, 1991

Appl. No.:

7/700744

Inventors:

Jon C. Shain - Anderson IN
James W. Herchenroeder - Fishers IN

Assignee:

General Motors Corporation - Detroit MI

International Classification:

G22F 100

US Classification:

419 66

Abstract:

A rare earth-containing powder is pressed into a compact at ambient temperatures using a solid lubricant applied only to the die wall and/or a core. The solid lubricant is applied by suspending lubricant powder in a fluorinated hydrocarbon liquid.