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
OG exemplary drawing
 
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.