Rare-earth-iron-nitrogen based magnetic material and method of m

Details Rare-earth-iron-nitrogen based magnetic material and method of m Rare-earth-iron-nitrogen based magnetic material and method of m

1997-07-23

1999-03-23

Yoon, Tae

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524413, 524435, 148105, 148230, 148101, C08K 310, H01F 1055, H01F 106

Patent

active

058860770

ABSTRACT:
A rare earth-iron-nitrogen based magnetic material has superior magnetic properties. A method of manufacturing the rare earth-iron-nitrogen based magnetic material controls the decline in the magnetic properties of the material during pulverizing processes, and pulverizes the material to a critical particle dimension for single-domain behavior. The fragility of the material is increased since the material includes at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W at 0.05-5% atomic percentage. The material is pulverized by a gas current type jet mill. Sample powder injected from a hopper is introduced from a supply mouth to a pulverizing chamber by nitrogen gas spouting from a pressure nozzle, and the powder is then accelerated to acoustic velocity by high pressure nitrogen gas spouting from gliding nozzles. As a result, the powder particles collide with each other. Pulverization is mainly carried out by collisions between powder particles, but can be accomplished by the collision of powder particles against the inner wall of a pulverizing chamber. The powder is then exhausted from a classifying zone.

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1990 J.M.D. Coey et al., "Improved Magnetic Properties by Treatment of Iron-Based Rare Earth Intermetallic Compounds in Ammonia", Journal of Magnetism and Magnetic Materials, pp. L251-L254.
Richard M. Bozorth, "Ferromagnetism", Bell Telephone Laboratories, Inc., pp. 4-5. D. Van Nostrand Co. Princeton, N.J.

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