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Microstructural studies of NdFeB powders produced by gas atomization

✍ Scribed by Yoshiki Sakaguchi; Tetsuji Harada; Toshiro Kuji

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
597 KB
Volume
181-182
Category
Article
ISSN
0921-5093

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✦ Synopsis

Nd15Fe77B 8 powders (particles) were produced by helium and argon atomization at pressures ranging from 3 to 9 MPa. The average particle diameter decreased with increasing atomizing pressure. The microstructures of the atomized powders were investigated under a scanning electron microscope. Except for the very fine powder (less than 2/~m), the microstructures were dendritic. The relationship between the particle diameter and the grain size of the dendrites was linear. This result suggests that the grain size is dependent only upon the particle diameter, no matter how high the applied atomization pressure is, provided the cooling medium (atomizing gas) is the same.

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