Effect of additions of zinc stearate on the properties of sintered Nd-Fe-B magnets

Zinc stearate additions have been used to increase the remanence of sintered Nd-Fe-B magnets produced by the powder metallurgy without powder pressing. Zinc stearate acts as an internal lubricant, i.e., it decreases the friction forces between the particles and favors an increase in the degree of te...

Full description

Saved in:
Bibliographic Details
Published in:Physics of metals and metallography 2013-04, Vol.114 (4), p.285-294
Main Authors: Popov, A. G., Gerasimov, E. G., Terent’ev, P. B., Gaviko, V. S., Shunyaev, K. Yu, Mikhailova, T. L., Vas’kovskii, V. O., Kulesh, N. A.
Format: Article
Language:English
Subjects:
Analysis
Chemistry and Materials Science
Densification
Density
Electrical and Magnetic Properties
Ferrous alloys
Lubrication and lubricants
Magnetic fields
Magnetic materials
Magnets
Materials Science
Metal products
Metallic Materials
Powders
Sintering
Specific gravity
Texture
Zinc stearate
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Zinc stearate additions have been used to increase the remanence of sintered Nd-Fe-B magnets produced by the powder metallurgy without powder pressing. Zinc stearate acts as an internal lubricant, i.e., it decreases the friction forces between the particles and favors an increase in the degree of texture of the powders, which is induced by the magnetic field. It is shown that the density and the magnetic hysteresis characteristics of sintered magnets produced using additions of 0.15 wt % zinc stearate exceeds the corresponding values obtained for magnets produced without this addition at a filling density of powders in containers of more than 2.9 and 3.0 g/cm 3 in dry and wet states, respectively. Using additions of zinc stearate in the amount of 0.15% with respect to the weight of the powder, magnets with a density of 7.55 g/cm 3 , B r = 14.02 kG, H c = 7.91 kOe, and ( BH ) max = 46.1 MG Oe have been produced.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X13040066