Key Engineering Materials, vol. 442 (2010) pp. 263-267
Neodymium based magnets are the powerful permanent magnet of today.
This paper will discuss iron based rare earth magnets. NdFeB sintered
magnet material has been developed. The magnets are produced by powder
metallurgy route involving hydrogen decrepitation technique for making
fine powder. After melting and casting, the NdFeB alloy is subject to
hydrogen atmosphere. Hydrogen slowly absorbs into the solid alloy and
makes it brittle, which upon milling becomes fine powder. Hydrogen is
then removed by placing the powder at temperature around 800 degrees C
under vacuum. Then the powders are pressed under isostatic conditions
and sintered at temperature range of 1020-1050 degrees C. Post
sintering is done at 800 degrees C and 580 degrees C followed by
quenching. Energy product in the range of 8 MGOe is achieved.
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