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

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874402

Huang, Yuhong ^[1]; Wei, Qiang ^[1]; Zheng, Haixing ^[2]

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1. West Hills, CA
2. Oak Park, CA

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.

• Research Organization: Chemat Technology, Inc. (Northridge, CA)
• DOE Contract Number: FG03-93ER81570
• Assignee: Chemat Technology, Inc. (Northrdige, CA)
• Patent Number(s): US 6383406
• OSTI ID: 874402
• Country of Publication: United States
• Language: English

Related Subjects

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
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