US 6,982,010 B2 | ||
High performance rare earth-iron giant magnetostrictive materials and method for its preparation | ||
Zheng Liu, Beijing (China) | ||
Assigned to Materitek Co. Ltd., Beijing (China) | ||
Filed on Oct. 31, 2002, as Appl. No. 10/285,180. | ||
Claims priority of application No. 02123585 A (CN), filed on Jul. 04, 2002. | ||
Prior Publication US 2004/0003870 A1, Jan. 08, 2004 | ||
Int. Cl. H01F 1/053 (2006.01) |
U.S. Cl. 148—101 | 7 Claims |
1. A method of preparing a high performance rare earth-iron giant magnetostrictive material comprising the steps of:
stoichiometrically metering and blending an iron source and a rare earth source, wherein the iron source is an industry grade
pure iron source and the rare earth source is selected from Tb, Dy, Sm and Ho;
melting the blend into an alloy at a temperature in the range of from 1250° to 1500° and at a vacuum condition into a melt;
maintaining the melt at the temperature and the vacuum condition for a period of time to completely mix the melt into a uniform
melt and to degas at least a portion of gasifiable impurities therefrom; and
directionally solidifying the alloy to obtain an oriented multi- or single crystalline rare earth-iron giant magnetostrictive
material.
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