The kinetics of oxidation of Nd-Fe-B powders

The kinetics of oxidation of Nd-Fe-B powders

The kinetics of oxidation of 2.5 mu m Nd-Fe-B powder are studied at temperatures 20, 80, 100 and 115 degrees C. The powdered alloy compromises 62.5 wt.% Fe, 35 wt.% Nd and 1.3 wt.% B. The percentage of weight gain is measured and compared with X-ray spectra recorded after various periods of oxidatio...

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Veröffentlicht in:IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) 1993-11, Vol.29 (6), p.2782-2784
Hauptverfasser: Turek, K., Liszkowski, P., Figiel, H.
Format: Artikel
Sprache:eng
Schlagworte:
360104 - Metals & Alloys- Physical Properties
360105 - Metals & Alloys- Corrosion & Erosion
Aging
ALLOYS
Applied sciences
BORON ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Corrosion
CORROSION PRODUCTS
DATA
Exact sciences and technology
EXPERIMENTAL DATA
Fe and its alloys
Grain size
INFORMATION
IRON ALLOYS
IRON COMPOUNDS
IRON OXIDES
Kinetic theory
MAGNETIC PROPERTIES
Magnetic properties and materials
Magnetization
MATERIALS SCIENCE
Metals. Metallurgy
Neodymium
NEODYMIUM ALLOYS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
Physics
Powders
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
Studies of specific magnetic materials
Temperature
TRANSITION ELEMENT COMPOUNDS
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Zusammenfassung:The kinetics of oxidation of 2.5 mu m Nd-Fe-B powder are studied at temperatures 20, 80, 100 and 115 degrees C. The powdered alloy compromises 62.5 wt.% Fe, 35 wt.% Nd and 1.3 wt.% B. The percentage of weight gain is measured and compared with X-ray spectra recorded after various periods of oxidation. Two stages of oxidation, with powder-like and exponential weight gain reaching a plateau, are distinguished at all temperatures. The effect of changes in phase composition on ferromagnetic properties due to oxidation are examined by a magnetic balance. On the basis of reported measurements, it is concluded that two processes contribute to oxidation of Nd-Fe-B in air, i.e., relatively quick, total oxidation of intergranular Nd and oxidation of Nd/sub 2/Fe/sub 14/B ( Phi ) which stops at 12% level. The recognition of three products of the oxidation at X-ray spectra, Nd/sub 2/O/sub 3/, NdFeO/sub 3/ and Fe/sub 3/O/sub 4/, makes it possible to deduce a final phase composition.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.281027