Magnetostructure material, and process for producing the same
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsTooru Sukigara, Jun Takizawa, Hitoshi Itami
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Abstract
A magnetostrictive material includes a rare earth element and a transition metal element, and has a plurality of spherical voids dispersed in the entire area thereof. The void content Vc is set in a range of 10%.ltoreq.Vc.ltoreq.40%. Thus, it is possible to provide a magnetostrictive material having a practical mechanical strength and a substantially increased magnetostriction amount.
Claims17
A magnetostrictive material including a rare earth element and a transition metal element, wherein said magnetostrictive material has a plurality of spherical voids dispersed in an entire volume thereof, a void content Vc by volume being in a range of 10%.ltoreq.Vc.ltoreq.40%.
A magnetostrictive material including Sm and a transition metal element, wherein said magnetostrictive material has a plurality of spherical voids dispersed in an entire volume thereof, a void content Vc by volume being in a range of 10%.ltoreq.Vc.ltoreq.40%.
A process for producing a magnetostrictive material, comprising the steps of producing by casting a blank including a transition metal element and an excessive amount of Sm larger than a final amount of Sm by an extra amount of Sm, and subjecting the blank to a thermal treatment in which said extra amount of Sm is removed to form a plurality of spherical voids (v).
Dependencies are inferred from the claim text.