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Title: Method for preparing high cure temperature rare earth iron compound magnetic material

Abstract

Insertion of light elements such as H,C, or N in the R.sub.2 Fe.sub.17 (R=rare earth metal) series has been found to modify the magnetic properties of these compounds, which thus become prospective candidates for high performance permanent magnets. The most spectacular changes are increases of the Curie temperature, T.sub.c, of the magnetization, M.sub.s, and of coercivity, H.sub.c, upon interstitial insertion. A preliminary product having a component R--Fe--C,N phase is produced by a chemical route. Rare earth metal and iron amides are synthesized followed by pyrolysis and sintering in an inert or reduced atmosphere, as a result of which, the R--Fe--C,N phases are formed. Fabrication of sintered rare earth iron nitride and carbonitride bulk magnet is impossible via conventional process due to the limitation of nitridation method.

Inventors:
 [1];  [1];  [2]
  1. (West Hills, CA)
  2. (Oak Park, CA)
Publication Date:
Research Org.:
Chemat Technology, Inc. (Northridge, CA)
OSTI Identifier:
874402
Patent Number(s):
US 6383406
Assignee:
Chemat Technology, Inc. (Northrdige, CA) OAK
DOE Contract Number:  
FG03-93ER81570
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; preparing; cure; temperature; rare; earth; iron; compound; magnetic; material; insertion; light; elements; hc; rsub2; fesub17; rrare; metal; series; found; modify; properties; compounds; prospective; candidates; performance; permanent; magnets; spectacular; changes; increases; curie; tsubc; magnetization; msubs; coercivity; hsubc; interstitial; preliminary; product; component; r-fe-cn; phase; produced; chemical; route; amides; synthesized; followed; pyrolysis; sintering; inert; reduced; atmosphere; result; phases; formed; fabrication; sintered; nitride; carbonitride; bulk; magnet; impossible; via; conventional; process; due; limitation; nitridation; rare earth; permanent magnet; earth metal; magnetic properties; /148/

Citation Formats

Huang, Yuhong, Wei, Qiang, and Zheng, Haixing. Method for preparing high cure temperature rare earth iron compound magnetic material. United States: N. p., 2002. Web.
Huang, Yuhong, Wei, Qiang, & Zheng, Haixing. Method for preparing high cure temperature rare earth iron compound magnetic material. United States.
Huang, Yuhong, Wei, Qiang, and Zheng, Haixing. Tue . "Method for preparing high cure temperature rare earth iron compound magnetic material". United States. https://www.osti.gov/servlets/purl/874402.
@article{osti_874402,
title = {Method for preparing high cure temperature rare earth iron compound magnetic material},
author = {Huang, Yuhong and Wei, Qiang and Zheng, Haixing},
abstractNote = {Insertion of light elements such as H,C, or N in the R.sub.2 Fe.sub.17 (R=rare earth metal) series has been found to modify the magnetic properties of these compounds, which thus become prospective candidates for high performance permanent magnets. The most spectacular changes are increases of the Curie temperature, T.sub.c, of the magnetization, M.sub.s, and of coercivity, H.sub.c, upon interstitial insertion. A preliminary product having a component R--Fe--C,N phase is produced by a chemical route. Rare earth metal and iron amides are synthesized followed by pyrolysis and sintering in an inert or reduced atmosphere, as a result of which, the R--Fe--C,N phases are formed. Fabrication of sintered rare earth iron nitride and carbonitride bulk magnet is impossible via conventional process due to the limitation of nitridation method.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

Patent:

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