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Title:
MAGNETOSTRICTIVE MATERIAL AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3894604
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To easily obtain a porous magnetostrictive material having practical mechanical strength and remarkably improved in the amount of magnetostriction by incorporating rare earth element and transition metal element and dispersing plural spherical pores at specific porosity.
SOLUTION: In a magnetostrictive material containing rare earth element, such as Sm, Pr, and Yb, and transition metal element, such as Fe, Ni, and Co, plural spherical pores are dispersed in the whole material and their porosity Vc is regulated to 10-40%. At that time, it is preferable that, for example, the sum T of the content of plural Sm single phases dispersed in the whole material is regulated to ≤5 atomic %, particularly to 0.1-1.3 atomic %. This magnetostrictive material can be obtained by casting a material containing Sm in an amount in excess of the final amount of Sm and transition metal element, heat-treating the resultant casting, bringing Al2O3 powder, etc., into contact with the casting in the course of the heat treatment, and eluting excess Sm to form pores. In the case where Fe is used as transition metal element, the resultant magnetostrictive material contains Sm phases and SmFe2 phases and further contains, as occasion demands, SmFe3 phases or Sm2Fe17 phases.


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Inventors:
Tsumugi pattern
Jun Takizawa
Hitoshi Itami
Application Number:
JP34063196A
Publication Date:
March 22, 2007
Filing Date:
December 05, 1996
Export Citation:
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Assignee:
Honda motor industry stock company
International Classes:
C21D6/00; C22C1/08; C22C38/00; H01F1/03; H01F1/053; H01L41/12; H01L41/20; (IPC1-7): C22C38/00; C21D6/00; H01L41/12; H01L41/20
Domestic Patent References:
JP2129316A
JP2277704A
JP1246342A
Other References:
Croat J. J,Liquid phase sintering of rare earth-iron (Dy0.7Tb0.3Fe2) magnetostrictive materials,Journal of Applied Physics,1978年 5月 2日,Vol.49 No.3 Pt.2,P.1972-4
Attorney, Agent or Firm:
Ken Ochiai
Kazuaki Niki



 
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