希土類ボンド磁石の圧縮成形における圧密挙動

概要

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Production of resin bonded rare-earth magnets is growing rapidly. Considerable effort has been directed toward inproving the properties of the magnetic powder for the purpose of high performance resin bonded rareearth magnets. Little attention, however, has been paid to the bonding technology. In this paper, the densification behavior of compression molded resin bonded rare-earth magnets which consist of isotropic Nd-Fe-B powder, epoxy resin and lubricants was studied. The results obtained are summarized as follows: (1) The local density in the compact decreases linearly and the local pressure drops exponentially with increasing distance from the pressing punch. (2) This pressure drop is caused by the friction between the compact and the die walls. (3) Suitable lubricants improve compressibility and result in high density and a corresponding high energy product.
社団法人粉体粉末冶金協会の論文